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gh/ezyang/628/base
pytorch/test/test_cuda.py
Michael Carilli fc6a153688 [WIP] Reanimate gradient scaling API with original scale update heuristic (#33366) 
Summary:
Also, windows memory failures responsible for the earlier reversion have been fixed.

This PR (initially) contains 2 commits:
* a revert of the revert
* all changes to implement the original Apex scale update heuristic, squashed into a single commit for easier diff review
Pull Request resolved: https://github.com/pytorch/pytorch/pull/33366

Differential Revision: D20099026

Pulled By: ngimel

fbshipit-source-id: 339b9b6bd5134bf055057492cd1eedb7e4461529
2020-02-25 19:00:34 -08:00

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import collections
import io
import tempfile
import unittest
import sys
from itertools import repeat, chain
import os
import gc
from contextlib import contextmanager
import threading
if sys.version_info[0] == 3:
import queue
else:
import Queue as queue
import torch
import torch.cuda
import torch.cuda.comm as comm
from torch import multiprocessing as mp
from torch._six import inf, nan
from test_torch import _TestTorchMixin
from torch.testing._internal.common_methods_invocations import tri_tests_args, tri_large_tests_args, \
_compare_trilu_indices, _compare_large_trilu_indices
from torch.testing._internal.common_utils import TestCase, get_gpu_type, freeze_rng_state, run_tests, \
PY3, IS_WINDOWS, NO_MULTIPROCESSING_SPAWN, skipIfRocm, \
load_tests, slowTest, skipCUDANonDefaultStreamIf, TEST_WITH_ROCM, TEST_NUMPY
# load_tests from common_utils is used to automatically filter tests for
# sharding on sandcastle. This line silences flake warnings
load_tests = load_tests
# We cannot import TEST_CUDA and TEST_MULTIGPU from torch.testing._internal.common_cuda here,
# because if we do that, the TEST_CUDNN line from torch.testing._internal.common_cuda will be executed
# multiple times as well during the execution of this test suite, and it will
# cause CUDA OOM error on Windows.
TEST_CUDA = torch.cuda.is_available()
TEST_MULTIGPU = TEST_CUDA and torch.cuda.device_count() >= 2
if not TEST_CUDA:
print('CUDA not available, skipping tests')
TestCase = object # noqa: F811
TEST_MAGMA = TEST_CUDA
TEST_LARGE_TENSOR = TEST_CUDA
TEST_MEDIUM_TENSOR = TEST_CUDA
TEST_CUDNN = TEST_CUDA
if TEST_CUDA:
torch.ones(1).cuda() # has_magma shows up after cuda is initialized
TEST_CUDNN = TEST_CUDA and (TEST_WITH_ROCM or
torch.backends.cudnn.is_acceptable(torch.tensor(1., device=torch.device('cuda:0'))))
TEST_MAGMA = torch.cuda.has_magma
TEST_LARGE_TENSOR = torch.cuda.get_device_properties(0).total_memory >= 12e9
TEST_MEDIUM_TENSOR = torch.cuda.get_device_properties(0).total_memory >= 6e9
types = [
torch.FloatTensor,
torch.DoubleTensor,
torch.LongTensor,
torch.IntTensor,
torch.ShortTensor,
torch.CharTensor,
torch.ByteTensor,
torch.HalfTensor,
]
def make_sparse_tensor(t, n, *sizes):
assert t.is_sparse
tensor = t()
i = tensor._indices()
i = i.new(len(sizes), n).copy_(
torch.cat([torch.LongTensor(1, n).random_(s) for s in sizes], 0))
v = tensor._values()
v = v.new(n).copy_(torch.randn(n))
return t(i, v, torch.Size(sizes))
_cycles_per_ms = None
def get_cycles_per_ms():
"""Approximate number of cycles per millisecond for torch.cuda._sleep"""
global _cycles_per_ms
if _cycles_per_ms is None:
start = torch.cuda.Event(enable_timing=True)
end = torch.cuda.Event(enable_timing=True)
start.record()
torch.cuda._sleep(1000000)
end.record()
end.synchronize()
_cycles_per_ms = 1000000 / start.elapsed_time(end)
return _cycles_per_ms
class TestCuda(TestCase):
_do_cuda_memory_leak_check = True
_do_cuda_non_default_stream = True
FIFTY_MIL_CYCLES = 50000000
def _check_memory_stat_consistency(self):
snapshot = torch.cuda.memory_snapshot()
expected_each_device = collections.defaultdict(lambda: collections.defaultdict(int))
for segment in snapshot:
expected = expected_each_device[segment["device"]]
pool_str = segment["segment_type"] + "_pool"
expected["segment.all.current"] += 1
expected["segment." + pool_str + ".current"] += 1
expected["allocated_bytes.all.current"] += segment["allocated_size"]
expected["allocated_bytes." + pool_str + ".current"] += segment["allocated_size"]
expected["reserved_bytes.all.current"] += segment["total_size"]
expected["reserved_bytes." + pool_str + ".current"] += segment["total_size"]
expected["active_bytes.all.current"] += segment["active_size"]
expected["active_bytes." + pool_str + ".current"] += segment["active_size"]
is_split = len(segment["blocks"]) > 1
for block in segment["blocks"]:
if block["state"] == "active_allocated":
expected["allocation.all.current"] += 1
expected["allocation." + pool_str + ".current"] += 1
if block["state"].startswith("active_"):
expected["active.all.current"] += 1
expected["active." + pool_str + ".current"] += 1
if block["state"] == "inactive" and is_split:
expected["inactive_split.all.current"] += 1
expected["inactive_split." + pool_str + ".current"] += 1
expected["inactive_split_bytes.all.current"] += block["size"]
expected["inactive_split_bytes." + pool_str + ".current"] += block["size"]
for device, expected in expected_each_device.items():
stats = torch.cuda.memory_stats(device)
for k, v in expected.items():
self.assertEqual(v, stats[k])
@staticmethod
def _test_memory_stats_generator(self, device=None, N=35):
if device is None:
device = torch.cuda.current_device()
m0 = torch.cuda.memory_allocated(device)
last_m_arr = [torch.cuda.memory_allocated(device)]
max_m_arr = [torch.cuda.max_memory_allocated(device)]
last_r_arr = [torch.cuda.memory_reserved(device)]
max_r_arr = [torch.cuda.max_memory_reserved(device)]
def alloc(*size):
with torch.cuda.device(device):
# NOTE: do **not** use methods that can have additional
# memory overhead, e.g., inplace random sampling methods.
# they can leave some memory occupied even after being
# deallocated, e.g., initialized RNG state, causing some
# memory checks below to fail.
return torch.cuda.FloatTensor(*size)
def assert_change(comp=1, empty_cache=False, reset_peak=False):
# comp > 0: increased
# comp = 0: equal
# comp < 0: decreased
new_m = torch.cuda.memory_allocated(device)
new_max_m = torch.cuda.max_memory_allocated(device)
if comp > 0:
self.assertGreater(new_m, last_m_arr[0])
elif comp < 0:
self.assertLess(new_m, last_m_arr[0])
else:
self.assertEqual(new_m, last_m_arr[0])
self.assertLessEqual(new_m, new_max_m)
self.assertGreaterEqual(new_max_m, max_m_arr[0])
last_m_arr[0] = new_m
max_m_arr[0] = new_max_m
new_r = torch.cuda.memory_reserved(device)
new_max_r = torch.cuda.max_memory_reserved(device)
# emptying cache may happen (due to allocation or empty_cache), so
# we can't assert new_c >= last_c
self.assertLessEqual(new_r, new_max_r)
self.assertGreaterEqual(new_max_r, max_r_arr[0])
last_r_arr[0] = new_r
max_r_arr[0] = new_max_r
if empty_cache:
torch.cuda.empty_cache()
new_r = torch.cuda.memory_reserved(device)
new_max_r = torch.cuda.max_memory_reserved(device)
self.assertLessEqual(new_r, last_r_arr[0])
self.assertLessEqual(new_r, new_max_r)
self.assertEqual(new_max_r, max_r_arr[0])
last_r_arr[0] = new_r
if reset_peak:
torch.cuda.reset_peak_memory_stats(device)
self.assertEqual(torch.cuda.memory_allocated(device), last_m_arr[0])
self.assertEqual(torch.cuda.max_memory_allocated(device), last_m_arr[0])
max_m_arr[0] = last_m_arr[0]
self.assertEqual(torch.cuda.memory_reserved(device), last_r_arr[0])
self.assertEqual(torch.cuda.max_memory_reserved(device), last_r_arr[0])
max_r_arr[0] = last_r_arr[0]
assert_change(0)
assert_change(0, reset_peak=True)
assert_change(0, empty_cache=True)
assert_change(0, reset_peak=True)
assert_change(0)
yield
tensors1 = [alloc(1), alloc(10, 20), alloc(200, 300, 2000)]
m1 = torch.cuda.memory_allocated(device)
assert_change(1)
yield
tensors2 = []
for i in range(1, int(N / 2) + 1):
# small ones
tensors2.append(alloc(i, i * 4))
assert_change(1)
yield
for i in range(5, int(N / 2) + 5):
# large ones
tensors2.append(alloc(i, i * 7, i * 9, i * 11))
assert_change(1, reset_peak=(i % 2 == 0))
yield
tensors2.append(alloc(0, 0, 0))
assert_change(0)
yield
permute = []
for i in torch.randperm(len(tensors2)):
permute.append(tensors2[i])
assert_change(0)
yield
del tensors2
assert_change(0)
yield
tensors2 = permute
assert_change(0)
yield
del permute
assert_change(0, reset_peak=True)
yield
for i in range(int(N / 2)):
x = tensors2[i].numel()
del tensors2[i]
assert_change(-x) # in case that tensors2[i] is empty
yield
for i in range(2, int(2 * N / 3) + 2):
tensors2.append(alloc(i, i * 3, i * 8))
assert_change(1)
yield
del tensors2
assert_change(-1, reset_peak=True)
assert_change(0)
self.assertEqual(torch.cuda.memory_allocated(device), m1)
yield True
del tensors1
assert_change(-1, reset_peak=True)
self.assertEqual(torch.cuda.memory_allocated(device), m0)
# test empty_cache and reset_peak
assert_change(0, empty_cache=True)
assert_change(0, reset_peak=True)
def test_memory_stats(self):
gc.collect()
torch.cuda.empty_cache()
for _ in self._test_memory_stats_generator(self):
self._check_memory_stat_consistency()
def test_cuda_get_device_name(self):
# Testing the behaviour with None as an argument
current_device = torch.cuda.current_device()
current_device_name = torch.cuda.get_device_name(current_device)
device_name_None = torch.cuda.get_device_name(None)
self.assertEqual(current_device_name, device_name_None)
# Testing the behaviour for No argument
device_name_no_argument = torch.cuda.get_device_name()
self.assertEqual(current_device_name, device_name_no_argument)
def test_cuda_get_device_capability(self):
# Testing the behaviour with None as an argument
current_device = torch.cuda.current_device()
current_device_capability = torch.cuda.get_device_capability(current_device)
device_capability_None = torch.cuda.get_device_capability(None)
self.assertEqual(current_device_capability, device_capability_None)
# Testing the behaviour for No argument
device_capability_no_argument = torch.cuda.get_device_capability()
self.assertEqual(current_device_capability, device_capability_no_argument)
@unittest.skipIf(not TEST_MULTIGPU, "only one GPU detected")
def test_memory_stats_multigpu(self):
# advance a generator with a end flag
def advance(gen, end):
if not end:
try:
next(gen)
except StopIteration:
end = True
return end
# interlace
torch.cuda.empty_cache()
gen0 = self._test_memory_stats_generator(self, device='cuda:0', N=35)
gen1 = self._test_memory_stats_generator(self, device=torch.device('cuda:1'), N=35)
end0 = end1 = False
while not (end0 and end1):
end0 = advance(gen0, end0)
end1 = advance(gen1, end1)
# semi-random order
torch.cuda.empty_cache()
gen0 = self._test_memory_stats_generator(self, device=0, N=35)
gen1 = self._test_memory_stats_generator(self, device=torch.device('cuda:1'), N=35)
end0 = end1 = False
while not (end0 and end1):
end0 = advance(gen0, end0)
if not end0:
gen1_max_times = torch.LongTensor(1).random_(0, 3)[0]
else:
gen1_max_times = inf
t = 0
while t < gen1_max_times and not end1:
end1 = advance(gen1, end1)
t += 1
def test_out_of_memory(self):
tensor = torch.zeros(1024, device='cuda')
with self.assertRaisesRegex(RuntimeError, "Tried to allocate 80.00 GiB"):
torch.empty(1024 * 1024 * 1024 * 80, dtype=torch.int8, device='cuda')
# ensure out of memory error doesn't disturb subsequent kernel
tensor.fill_(1)
self.assertTrue((tensor == 1).all())
@unittest.skipIf(not TEST_MULTIGPU, "only one GPU detected")
def test_autogpu(self):
x = torch.randn(5, 5).cuda()
y = torch.randn(5, 5).cuda()
self.assertEqual(x.get_device(), 0)
self.assertEqual(x.get_device(), 0)
with torch.cuda.device(1):
z = torch.randn(5, 5).cuda()
self.assertEqual(z.get_device(), 1)
q = x.add(y)
self.assertEqual(q.get_device(), 0)
w = torch.randn(5, 5).cuda()
self.assertEqual(w.get_device(), 1)
self.assertEqual(y.cuda().get_device(), 1)
z = z.cuda()
self.assertEqual(z.get_device(), 0)
@unittest.skipIf(not TEST_MULTIGPU, "only one GPU detected")
def test_new(self):
x = torch.randn(3, 3).cuda()
self.assertEqual(x.new([0, 1, 2]).get_device(), 0)
self.assertEqual(x.new([0, 1, 2], device=1).get_device(), 1)
with torch.cuda.device(1):
self.assertEqual(x.new([0, 1, 2]).get_device(), 0)
self.assertEqual(x.new([0, 1, 2], device=1).get_device(), 1)
@unittest.skipIf(not TEST_MULTIGPU, "only one GPU detected")
def test_copy_device(self):
x = torch.randn(5, 5).cuda()
with torch.cuda.device(1):
y = x.cuda()
self.assertEqual(y.get_device(), 1)
self.assertIs(y.cuda(), y)
z = y.cuda(0)
self.assertEqual(z.get_device(), 0)
self.assertIs(z.cuda(0), z)
x = torch.randn(5, 5)
with torch.cuda.device(1):
y = x.cuda()
self.assertEqual(y.get_device(), 1)
self.assertIs(y.cuda(), y)
z = y.cuda(0)
self.assertEqual(z.get_device(), 0)
self.assertIs(z.cuda(0), z)
def _test_copy_sync_current_stream(self, x, y):
x_plus_one = x + 1
s0 = torch.cuda.Stream(device=x.device)
s1 = torch.cuda.Stream(device=y.device)
s2 = torch.cuda.Stream(device=x.device)
s3 = torch.cuda.Stream(device=y.device)
# same dst stream different src streams
with torch.cuda.stream(s0):
torch.cuda._sleep(TestCuda.FIFTY_MIL_CYCLES)
with torch.cuda.stream(s1):
y.copy_(x_plus_one)
with torch.cuda.stream(s2), torch.cuda.stream(s1):
y.copy_(x)
s1.synchronize()
# The copy() is synchronized on the current streams of both src and dst.
# In the above test, the _sleep() op on s0 will not block the copy() on
# s2, but both copies are synchronized on s1 in the dst device. Hence,
# x is copied to y after x_plus_one is copied to y. If x and y are on
# the same device, both copy() ops are synchronized on s1.
self.assertEqual(y, x)
# same src stream different dst streams
with torch.cuda.stream(s1):
torch.cuda._sleep(TestCuda.FIFTY_MIL_CYCLES)
with torch.cuda.stream(s0):
y.copy_(x_plus_one)
with torch.cuda.stream(s3), torch.cuda.stream(s0):
y.copy_(x)
s0.synchronize()
# Similarly, both copy() ops are synchronized on s0.
self.assertEqual(y, x)
@unittest.skipIf(not TEST_MULTIGPU, "only one GPU detected")
def test_copy_streams(self):
d0 = torch.device('cuda:0')
x0 = torch.zeros(5, 5, device=d0)
d1 = torch.device('cuda:1')
x1 = torch.zeros(5, 5, device=d1)
self._test_copy_sync_current_stream(x0, x1)
x2 = torch.zeros(5, 5, device=d0)
self._test_copy_sync_current_stream(x0, x2)
def test_copy_non_blocking(self):
def _test_copy_non_blocking(a, b):
event = torch.cuda.Event()
a.copy_(b, non_blocking=True)
event.record()
self.assertFalse(event.query())
event.synchronize()
self.assertEqual(a, b)
# 10MB copies
x = torch.ones(10000000, dtype=torch.uint8).cuda()
y = torch.zeros(10000000, dtype=torch.uint8).pin_memory()
_test_copy_non_blocking(x, y)
x = torch.zeros(10000000, dtype=torch.uint8).pin_memory()
y = torch.ones(10000000, dtype=torch.uint8).cuda()
_test_copy_non_blocking(x, y)
def test_serialization_array_with_storage(self):
x = torch.randn(5, 5).cuda()
y = torch.IntTensor(2, 5).fill_(0).cuda()
q = [x, y, x, y.storage()]
with tempfile.NamedTemporaryFile() as f:
torch.save(q, f)
f.seek(0)
q_copy = torch.load(f)
self.assertEqual(q_copy, q, 0)
q_copy[0].fill_(5)
self.assertEqual(q_copy[0], q_copy[2], 0)
self.assertTrue(isinstance(q_copy[0], torch.cuda.FloatTensor))
self.assertTrue(isinstance(q_copy[1], torch.cuda.IntTensor))
self.assertTrue(isinstance(q_copy[2], torch.cuda.FloatTensor))
self.assertTrue(isinstance(q_copy[3], torch.cuda.IntStorage))
q_copy[1].fill_(10)
self.assertTrue(q_copy[3], torch.cuda.IntStorage(10).fill_(10))
def test_type_conversions(self):
x = torch.randn(5, 5)
self.assertIsInstance(x.float(), torch.FloatTensor)
self.assertIsInstance(x.cuda().double(), torch.cuda.DoubleTensor)
self.assertIsInstance(x.cuda().float(), torch.cuda.FloatTensor)
self.assertIsInstance(x.cuda().float().cpu(), torch.FloatTensor)
self.assertIsInstance(x.cuda().float().cpu().int(), torch.IntTensor)
y = x.storage()
self.assertIsInstance(y.float(), torch.FloatStorage)
self.assertIsInstance(y.cuda().double(), torch.cuda.DoubleStorage)
self.assertIsInstance(y.cuda().float(), torch.cuda.FloatStorage)
self.assertIsInstance(y.cuda().float().cpu(), torch.FloatStorage)
self.assertIsInstance(y.cuda().float().cpu().int(), torch.IntStorage)
@unittest.skip("was disabled due to not enough memory, but actually it always fail")
def test_arithmetic_large_tensor(self):
x = torch.empty(2**30, device='cuda')
x.fill_(1)
self.assertEqual(x.sum(), 2**30)
x += 1
self.assertEqual(x.sum(), 2**31)
x.fill_(1)
x -= 0.5
self.assertEqual(x.sum(), 2**29)
x.fill_(1)
x *= 2
self.assertEqual(x.sum(), 2**31)
x.fill_(1)
x /= 2
self.assertEqual(x.sum(), 2**29)
def _test_broadcast(self, input):
if not TEST_MULTIGPU:
raise unittest.SkipTest("only one GPU detected")
result = comm.broadcast(input, (0, 1))
for i, t in enumerate(result):
self.assertEqual(t.get_device(), i)
self.assertEqual(t, input)
if input.is_cuda and input.get_device() == i:
self.assertEqual(t.data_ptr(), input.data_ptr())
def test_broadcast_cpu(self):
self._test_broadcast(torch.randn(5, 5))
def test_broadcast_gpu(self):
self._test_broadcast(torch.randn(5, 5).cuda())
@staticmethod
def _test_broadcast_coalesced(self, tensors, buffer_size):
b_tensors = [comm.broadcast(t, (0, 1)) for t in tensors]
for (_, bt), t in zip(b_tensors, tensors):
self.assertEqual(bt.get_device(), 1)
self.assertEqual(bt, t)
self.assertIsInstance(bt, type(t))
bc_tensors = comm.broadcast_coalesced(tensors, (0, 1), buffer_size=buffer_size)
bc_tensors_t = list(zip(*bc_tensors))
self.assertEqual(b_tensors, bc_tensors_t)
for (_, bt), (_, bct) in zip(b_tensors, bc_tensors_t):
self.assertEqual(bt.get_device(), bct.get_device())
self.assertIsInstance(bct, type(bt))
# check that tensors on device[0] are returned as-is
for out_tensors in (b_tensors, bc_tensors_t):
for inp_t, (out_t, _) in zip(tensors, out_tensors):
self.assertIs(inp_t, out_t)
# check that the tensors not on device[0] have different version counters
# NOTE [ Version Counter in comm.*_coalesced ]
versions = [t._version for _, t in bc_tensors_t]
for old_version, (_, t) in zip(versions, bc_tensors_t):
self.assertEqual(t._version, old_version)
t.zero_()
self.assertEqual(t._version, old_version + 1)
@unittest.skipIf(not TEST_MULTIGPU, "only one GPU detected")
# Note: fails sometimes on the CI, passes on dual gfx906
def test_broadcast_coalesced(self):
numel = 5
num_bytes = numel * 8
tensors = [
make_sparse_tensor(torch.cuda.sparse.DoubleTensor, 1, 2, 3),
torch.randn(numel).long().cuda(),
torch.randn(numel).cuda(),
make_sparse_tensor(torch.cuda.sparse.DoubleTensor, 10, 2, 3),
make_sparse_tensor(torch.cuda.sparse.DoubleTensor, 5, 2, 3),
make_sparse_tensor(torch.cuda.sparse.LongTensor, 7, 3, 3),
make_sparse_tensor(torch.cuda.sparse.FloatTensor, 2, 2, 3),
torch.randn(numel).long().cuda(),
torch.randn(numel).long().cuda(),
make_sparse_tensor(torch.cuda.sparse.LongTensor, 3, 2, 7),
torch.randn(numel * 2).int().cuda(), # int is 2x shorter
torch.randn(numel).cuda(),
]
self._test_broadcast_coalesced(self, tensors, num_bytes * 5 // 2)
@unittest.skipIf(not TEST_MULTIGPU, "only one GPU detected")
def test_broadcast_coalesced_dense_only(self):
numel = 5
num_bytes = numel * 8
tensors = [
torch.randn(numel).long().cuda(),
torch.randn(numel).cuda(),
torch.randn(numel).long().cuda(),
torch.randn(numel).long().cuda(),
torch.randn(numel * 2).int().cuda(), # int is 2x shorter
torch.randn(numel).cuda(),
]
self._test_broadcast_coalesced(self, tensors, num_bytes * 5 // 2)
@unittest.skipIf(not TEST_MULTIGPU, "only one GPU detected")
def test_reduce_add(self):
x = torch.randn(5, 5)
y = torch.randn(5, 5)
x_cuda = x.cuda(0)
y_cuda = y.cuda(1)
result = comm.reduce_add((x_cuda, y_cuda))
self.assertEqual(result.get_device(), 0)
self.assertEqual(result.cpu(), x + y)
@staticmethod
def _test_reduce_add_coalesced(self, tensors, buffer_size):
dup_tensors = [tensors, list(map(lambda t: t.cuda(1), tensors))]
r_tensors = list(map(comm.reduce_add, zip(*dup_tensors)))
for r, t in zip(r_tensors, tensors):
self.assertEqual(r.get_device(), t.get_device())
self.assertEqual(r, t * 2)
self.assertEqual(r.type(), t.type())
rc_tensors = comm.reduce_add_coalesced(dup_tensors, buffer_size=buffer_size)
self.assertEqual(r_tensors, rc_tensors)
for r, rc in zip(r_tensors, rc_tensors):
self.assertEqual(rc.get_device(), r.get_device())
self.assertEqual(rc.type(), r.type())
# Since we have both cuda:0 and cuda:1 inputs, the outputs must be new.
# We can check that they have different version counters.
# NOTE [ Version Counter in comm.*_coalesced ]
versions = [t._version for t in rc_tensors]
for old_version, t in zip(versions, rc_tensors):
self.assertEqual(t._version, old_version)
t.zero_()
self.assertEqual(t._version, old_version + 1)
@unittest.skipIf(not TEST_MULTIGPU, "only one GPU detected")
def test_reduce_add_coalesced(self):
numel = 5
num_bytes = numel * 8
tensors = [
make_sparse_tensor(torch.cuda.sparse.DoubleTensor, 1, 2, 3),
torch.randn(numel).long().cuda(),
torch.randn(numel).cuda(),
make_sparse_tensor(torch.cuda.sparse.DoubleTensor, 10, 2, 3),
make_sparse_tensor(torch.cuda.sparse.DoubleTensor, 5, 2, 3),
make_sparse_tensor(torch.cuda.sparse.LongTensor, 7, 3, 3),
make_sparse_tensor(torch.cuda.sparse.FloatTensor, 2, 2, 3),
torch.randn(numel).long().cuda(),
torch.randn(numel).long().cuda(),
make_sparse_tensor(torch.cuda.sparse.LongTensor, 3, 2, 7),
torch.randn(numel * 2).int().cuda(), # int is 2x shorter
torch.randn(numel).cuda(),
]
self._test_reduce_add_coalesced(self, tensors, num_bytes * 5 // 2)
@unittest.skipIf(not TEST_MULTIGPU, "only one GPU detected")
def test_reduce_add_coalesced_dense_only(self):
numel = 5
num_bytes = numel * 8
tensors = [
torch.randn(numel).long().cuda(),
torch.randn(numel).cuda(),
torch.randn(numel).long().cuda(),
torch.randn(numel).long().cuda(),
torch.randn(numel * 2).int().cuda(), # int is 2x shorter
torch.randn(numel).cuda(),
]
self._test_reduce_add_coalesced(self, tensors, num_bytes * 5 // 2)
def _test_scatter(self, input, chunk_sizes=None, dim=0):
if not TEST_MULTIGPU:
raise unittest.SkipTest("only one GPU detected")
result = comm.scatter(input, (0, 1), chunk_sizes, dim)
self.assertEqual(len(result), 2)
if chunk_sizes is None:
chunk_sizes = tuple(repeat(input.size(dim) // 2, 2))
chunk_start = 0
for i, r in enumerate(result):
chunk_end = chunk_start + chunk_sizes[i]
index = [slice(None, None), slice(None, None)]
index[dim] = slice(chunk_start, chunk_end)
self.assertEqual(r, input[tuple(index)], 0)
chunk_start = chunk_end
def test_scatter_cpu(self):
self._test_scatter(torch.randn(4, 4), dim=0)
def test_scatter_cpu_dim(self):
self._test_scatter(torch.randn(4, 4), dim=1)
def test_scatter_cpu_neg_dim(self):
self._test_scatter(torch.randn(4, 4), dim=-2)
def test_scatter_cpu_sizes(self):
self._test_scatter(torch.randn(6, 4), chunk_sizes=(2, 4))
def test_scatter_gpu(self):
self._test_scatter(torch.randn(4, 4).cuda(), dim=0)
def test_scatter_gpu_dim(self):
self._test_scatter(torch.randn(4, 4).cuda(), dim=1)
def test_scatter_gpu_neg_dim(self):
self._test_scatter(torch.randn(4, 4).cuda(), dim=-2)
def test_scatter_gpu_sizes(self):
self._test_scatter(torch.randn(6, 4).cuda(), chunk_sizes=(2, 4))
def _test_gather(self, dim):
if not TEST_MULTIGPU:
raise unittest.SkipTest("only one GPU detected")
x = torch.randn(2, 5).cuda(0)
y = torch.randn(2, 5).cuda(1)
result = comm.gather((x, y), dim)
expected_size = list(x.size())
expected_size[dim] += y.size(dim)
expected_size = torch.Size(expected_size)
self.assertEqual(result.get_device(), 0)
self.assertEqual(result.size(), expected_size)
index = [slice(None, None), slice(None, None)]
index[dim] = slice(0, x.size(dim))
self.assertEqual(result[tuple(index)], x)
index[dim] = slice(x.size(dim), x.size(dim) + y.size(dim))
self.assertEqual(result[tuple(index)], y)
# Bool test case
t = torch.tensor([[False, True], [True, True]], device='cuda')
self.assertEqual(torch.gather(t, 1, torch.tensor([[0, 0], [1, 0]], device='cuda')),
torch.tensor([[False, False], [True, True]], device='cuda'))
def test_gather(self):
self._test_gather(0)
def test_gather_dim(self):
self._test_gather(1)
@unittest.skipIf(not TEST_MULTIGPU, "only one GPU detected")
def test_memory_format_scatter_gather(self):
nhwc = torch.randn((10, 3, 32, 32), device='cpu').contiguous(memory_format=torch.channels_last)
results = torch.cuda.comm.scatter(nhwc, (0, 1), None, 0)
for result in results:
self.assertFalse(result.is_contiguous())
self.assertTrue(result.is_contiguous(memory_format=torch.channels_last))
gathered = torch.cuda.comm.gather(results)
self.assertTrue(gathered.is_contiguous(memory_format=torch.channels_last))
def test_torch_manual_seed_seeds_cuda_devices(self):
with freeze_rng_state():
x = torch.zeros(4, 4).float().cuda()
torch.manual_seed(2)
self.assertEqual(torch.cuda.initial_seed(), 2)
x.uniform_()
torch.manual_seed(2)
y = x.clone().uniform_()
self.assertEqual(x, y)
self.assertEqual(torch.cuda.initial_seed(), 2)
def test_manual_seed(self):
with freeze_rng_state():
x = torch.zeros(4, 4).float().cuda()
torch.cuda.manual_seed(2)
self.assertEqual(torch.cuda.initial_seed(), 2)
x.uniform_()
a = torch.bernoulli(torch.full_like(x, 0.5))
torch.cuda.manual_seed(2)
y = x.clone().uniform_()
b = torch.bernoulli(torch.full_like(x, 0.5))
self.assertEqual(x, y)
self.assertEqual(a, b)
self.assertEqual(torch.cuda.initial_seed(), 2)
@unittest.skipIf(not TEST_MULTIGPU, "only one GPU detected")
def test_cat_autogpu(self):
x = torch.randn(4, 4).cuda(1)
y = torch.randn(4, 4).cuda(1)
z = torch.cat([x, y], 0)
self.assertEqual(z.get_device(), x.get_device())
def test_bernoulli(self):
_TestTorchMixin._test_bernoulli(self, torch.float32, torch.float64, 'cuda')
_TestTorchMixin._test_bernoulli(self, torch.float32, torch.float16, 'cuda')
_TestTorchMixin._test_bernoulli(self, torch.float16, torch.float64, 'cuda')
_TestTorchMixin._test_bernoulli(self, torch.float16, torch.float16, 'cuda')
# test that it works with integral tensors
_TestTorchMixin._test_bernoulli(self, torch.uint8, torch.float64, 'cuda')
_TestTorchMixin._test_bernoulli(self, torch.uint8, torch.float16, 'cuda')
_TestTorchMixin._test_bernoulli(self, torch.int64, torch.float64, 'cuda')
_TestTorchMixin._test_bernoulli(self, torch.int64, torch.float16, 'cuda')
# test that it works with bool tensors
_TestTorchMixin._test_bernoulli(self, torch.bool, torch.float16, 'cuda')
_TestTorchMixin._test_bernoulli(self, torch.int64, torch.float16, 'cuda')
@unittest.skipIf(torch.cuda.device_count() >= 10, "Loading a cuda:9 tensor")
@unittest.skipIf(not PY3, "Tensor was serialized with Python 3")
def test_load_nonexistent_device(self):
# Setup: create a serialized file object with a 'cuda:9' restore location
tensor = torch.randn(2, device='cuda')
buf = io.BytesIO()
torch.save(tensor, buf)
# NB: this might not work in the future if serialization changes
buf = io.BytesIO(buf.getvalue().replace(b'cuda:0', b'cuda:9'))
msg = r'Attempting to deserialize object on CUDA device 9'
with self.assertRaisesRegex(RuntimeError, msg):
_ = torch.load(buf)
def test_specify_improper_device_name(self):
import os
fname = "tempfile.pt"
try:
with self.assertRaisesRegex(RuntimeError, "Expected one of cpu"):
torch.save([torch.nn.Parameter(torch.randn(10, 10))], fname,
_use_new_zipfile_serialization=True)
torch.load(fname, 'cuda0')
finally:
if os.path.exists(fname):
os.remove(fname)
def test_get_device_index(self):
from torch.cuda._utils import _get_device_index
with self.assertRaisesRegex(RuntimeError, "Expected one of cpu"):
_get_device_index('cuda0', optional=True)
with self.assertRaisesRegex(ValueError, "Expected a cuda device"):
cpu_device = torch.device('cpu')
_get_device_index(cpu_device, optional=True)
def test_serialization_array_with_empty(self):
x = [torch.randn(4, 4).cuda(), torch.cuda.FloatTensor()]
with tempfile.NamedTemporaryFile() as f:
torch.save(x, f)
f.seek(0)
x_copy = torch.load(f)
for original, copy in zip(x, x_copy):
self.assertEqual(copy, original)
self.assertIs(type(copy), type(original))
self.assertEqual(copy.get_device(), original.get_device())
@unittest.skipIf(not TEST_MULTIGPU, "detected only one GPU")
def test_multigpu_serialization_remap(self):
x = [torch.randn(4, 4).cuda(0), torch.randn(4, 4).cuda(1)]
def gpu_remap(storage, location):
if location == 'cuda:1':
return storage.cuda(0)
with tempfile.NamedTemporaryFile() as f:
torch.save(x, f)
f.seek(0)
x_copy = torch.load(f, map_location=gpu_remap)
for original, copy in zip(x, x_copy):
self.assertEqual(copy, original)
self.assertIs(type(copy), type(original))
self.assertEqual(copy.get_device(), 0)
@unittest.skipIf(not TEST_MULTIGPU, "detected only one GPU")
def test_multigpu_serialization_remap_dict(self):
x = [torch.randn(4, 4).cuda(0), torch.randn(4, 4).cuda(1)]
with tempfile.NamedTemporaryFile() as f:
torch.save(x, f)
f.seek(0)
x_copy = torch.load(f, map_location={'cuda:1': 'cuda:0'})
for original, copy in zip(x, x_copy):
self.assertEqual(copy, original)
self.assertIs(type(copy), type(original))
self.assertEqual(copy.get_device(), 0)
@unittest.skipIf(not TEST_MULTIGPU, "detected only one GPU")
def test_multigpu_storage_clone(self):
x = torch.randn(4, 4, device='cuda:1').storage()
y = x.clone()
self.assertEqual(x.get_device(), y.get_device())
for t in ['byte', 'char', 'short', 'int', 'long', 'half', 'double']:
self.assertEqual(getattr(x, t)().get_device(), x.get_device())
@unittest.skipIf(not TEST_MULTIGPU, "detected only one GPU")
def test_cuda_set_device(self):
x = torch.randn(5, 5)
with torch.cuda.device(1):
self.assertEqual(x.cuda().get_device(), 1)
torch.cuda.set_device(0)
self.assertEqual(x.cuda().get_device(), 0)
with torch.cuda.device(1):
self.assertEqual(x.cuda().get_device(), 1)
self.assertEqual(x.cuda().get_device(), 0)
torch.cuda.set_device(1)
self.assertEqual(x.cuda().get_device(), 0)
def test_is_tensor(self):
for t in types:
tensor = get_gpu_type(t)()
self.assertTrue(torch.is_tensor(tensor))
self.assertTrue(torch.is_tensor(torch.cuda.HalfTensor()))
def test_cuda_synchronize(self):
torch.cuda.synchronize()
torch.cuda.synchronize('cuda')
torch.cuda.synchronize('cuda:0')
torch.cuda.synchronize(0)
torch.cuda.synchronize(torch.device('cuda:0'))
if TEST_MULTIGPU:
torch.cuda.synchronize('cuda:1')
torch.cuda.synchronize(1)
torch.cuda.synchronize(torch.device('cuda:1'))
with self.assertRaisesRegex(ValueError, "Expected a cuda device, but"):
torch.cuda.synchronize(torch.device("cpu"))
with self.assertRaisesRegex(ValueError, "Expected a cuda device, but"):
torch.cuda.synchronize("cpu")
@unittest.skipIf(not TEST_MULTIGPU, "detected only one GPU")
def test_current_stream(self):
d0 = torch.device('cuda:0')
d1 = torch.device('cuda:1')
s0 = torch.cuda.current_stream()
s1 = torch.cuda.current_stream(device=1)
s2 = torch.cuda.current_stream(device=0)
self.assertEqual(d0, s0.device)
self.assertEqual(d1, s1.device)
self.assertEqual(d0, s2.device)
self.assertEqual(s0, s2)
with torch.cuda.device(d1):
s0 = torch.cuda.current_stream()
s1 = torch.cuda.current_stream(1)
s2 = torch.cuda.current_stream(d0)
self.assertEqual(d1, s0.device)
self.assertEqual(d1, s1.device)
self.assertEqual(d0, s2.device)
self.assertEqual(s0, s1)
with self.assertRaisesRegex(ValueError,
"Expected a cuda device, but got: cpu"):
torch.cuda.current_stream(torch.device('cpu'))
@unittest.skipIf(not TEST_MULTIGPU, "detected only one GPU")
@skipCUDANonDefaultStreamIf(True)
def test_default_stream(self):
d0 = torch.device('cuda:0')
d1 = torch.device('cuda:1')
with torch.cuda.device(d0):
s0 = torch.cuda.default_stream()
with torch.cuda.device(d1):
s1 = torch.cuda.default_stream()
s2 = torch.cuda.default_stream(device=0)
s3 = torch.cuda.default_stream(d1)
self.assertEqual(d0, s0.device)
self.assertEqual(d1, s1.device)
self.assertEqual(d0, s2.device)
self.assertEqual(d1, s3.device)
self.assertEqual(s0, s2)
self.assertEqual(s1, s3)
with torch.cuda.device(d0):
self.assertEqual(torch.cuda.current_stream(), s0)
with torch.cuda.device(d1):
self.assertEqual(torch.cuda.current_stream(), s1)
with self.assertRaisesRegex(ValueError,
"Expected a cuda device, but got: cpu"):
torch.cuda.default_stream(torch.device('cpu'))
@skipCUDANonDefaultStreamIf(True)
def test_streams(self):
default_stream = torch.cuda.current_stream()
user_stream = torch.cuda.Stream()
self.assertEqual(torch.cuda.current_stream(), default_stream)
self.assertNotEqual(default_stream, user_stream)
self.assertEqual(default_stream.cuda_stream, 0)
self.assertNotEqual(user_stream.cuda_stream, 0)
with torch.cuda.stream(user_stream):
self.assertEqual(torch.cuda.current_stream(), user_stream)
self.assertTrue(user_stream.query())
tensor1 = torch.ByteTensor(5).pin_memory()
tensor2 = tensor1.cuda(non_blocking=True) + 1
default_stream.synchronize()
self.assertTrue(default_stream.query())
@unittest.skipIf(not TEST_MULTIGPU, "detected only one GPU")
def test_stream_event_device(self):
d0 = torch.device('cuda:0')
d1 = torch.device('cuda:1')
e0 = torch.cuda.Event()
self.assertEqual(None, e0.device)
with torch.cuda.device(d0):
s0 = torch.cuda.current_stream()
s0.record_event(e0)
with torch.cuda.device(d1):
s1 = torch.cuda.Stream()
e1 = s1.record_event()
self.assertEqual(s0.device, torch.device('cuda:0'))
self.assertEqual(e0.device, torch.device('cuda:0'))
self.assertEqual(s1.device, torch.device('cuda:1'))
self.assertEqual(e1.device, torch.device('cuda:1'))
def test_stream_event_repr(self):
s = torch.cuda.current_stream()
self.assertTrue("torch.cuda.Stream" in s.__repr__())
e = torch.cuda.Event()
self.assertTrue("torch.cuda.Event" in e.__repr__())
s.record_event(e)
self.assertTrue("torch.cuda.Event" in e.__repr__())
@unittest.skipIf(not TEST_MULTIGPU, "detected only one GPU")
# Note: fails sometimes on the CI, passes on dual gfx906
@skipIfRocm
def test_stream_context(self):
s0 = torch.cuda.current_stream()
s1 = torch.cuda.Stream(device=1)
s2 = torch.cuda.Stream(device=0)
with torch.cuda.device(s1.device):
prev_stream_on_cuda1 = torch.cuda.current_stream()
self.assertEqual(torch.cuda.current_stream(), s0)
self.assertEqual(0, torch.cuda.current_device())
with torch.cuda.stream(s1):
self.assertEqual(torch.cuda.current_stream(), s1)
self.assertEqual(1, torch.cuda.current_device())
with torch.cuda.stream(s2):
self.assertEqual(torch.cuda.current_stream(), s2)
self.assertEqual(0, torch.cuda.current_device())
with torch.cuda.stream(s0):
self.assertEqual(torch.cuda.current_stream(), s0)
self.assertEqual(0, torch.cuda.current_device())
self.assertEqual(torch.cuda.current_stream(), s2)
self.assertEqual(0, torch.cuda.current_device())
self.assertEqual(torch.cuda.current_stream(), s1)
self.assertEqual(1, torch.cuda.current_device())
with torch.cuda.device(s1.device):
self.assertEqual(prev_stream_on_cuda1, torch.cuda.current_stream())
self.assertEqual(torch.cuda.current_stream(), s0)
self.assertEqual(0, torch.cuda.current_device())
@unittest.skipIf(not TEST_MULTIGPU, "detected only one GPU")
def test_streams_multi_gpu(self):
default_stream = torch.cuda.current_stream()
self.assertEqual(default_stream.device, torch.device('cuda:0'))
stream = torch.cuda.Stream(device=1)
self.assertEqual(stream.device, torch.device('cuda:1'))
with torch.cuda.device(1):
self.assertEqual(
torch.cuda.current_stream().device, torch.device('cuda:1'))
self.assertNotEqual(torch.cuda.current_stream(), default_stream)
@unittest.skipIf(not TEST_MULTIGPU, "detected only one GPU")
def test_streams_multi_gpu_query(self):
d0 = torch.device('cuda:0')
d1 = torch.device('cuda:1')
torch.cuda.synchronize(d0)
torch.cuda.synchronize(d1)
with torch.cuda.device(d0):
s0 = torch.cuda.current_stream()
with torch.cuda.device(d1):
s1 = torch.cuda.current_stream()
torch.cuda._sleep(TestCuda.FIFTY_MIL_CYCLES)
self.assertTrue(s0.query())
self.assertFalse(s1.query())
with torch.cuda.device(d0):
self.assertTrue(s0.query())
self.assertFalse(s1.query())
with torch.cuda.device(d1):
self.assertTrue(s0.query())
self.assertFalse(s1.query())
# deliberately using a different device
with torch.cuda.device(d0):
s1.synchronize()
self.assertTrue(s0.query())
self.assertTrue(s1.query())
with torch.cuda.device(d0):
self.assertTrue(s0.query())
self.assertTrue(s1.query())
with torch.cuda.device(d1):
self.assertTrue(s0.query())
self.assertTrue(s1.query())
@unittest.skipIf(not TEST_MULTIGPU, "detected only one GPU")
def test_streams_multi_gpu_eq(self):
d0 = torch.device('cuda:0')
d1 = torch.device('cuda:1')
with torch.cuda.device(d0):
s0 = torch.cuda.current_stream()
s1 = torch.cuda.current_stream()
with torch.cuda.device(d1):
s2 = torch.cuda.current_stream()
s3 = torch.cuda.current_stream()
self.assertTrue(s0 == s0)
self.assertTrue(s0 == s1)
self.assertTrue(s2 == s2)
self.assertTrue(s2 == s3)
self.assertFalse(s0 == s2)
self.assertFalse(s1 == s3)
self.assertEqual(s0.device, s1.device)
self.assertEqual(s0.cuda_stream, s1.cuda_stream)
self.assertEqual(s2.device, s3.device)
self.assertEqual(s2.cuda_stream, s3.cuda_stream)
self.assertNotEqual(s0.device, s3.device)
self.assertEqual(hash(s0), hash(s1))
self.assertEqual(hash(s2), hash(s3))
self.assertNotEqual(hash(s0), hash(s3))
@unittest.skipIf(not TEST_MULTIGPU, "multi-GPU not supported")
@skipIfRocm
def test_streams_priority(self):
low, high = torch.cuda.Stream.priority_range()
s0 = torch.cuda.Stream(device=0, priority=low)
self.assertEqual(low, s0.priority)
self.assertEqual(torch.device('cuda:0'), s0.device)
s1 = torch.cuda.Stream(device=1, priority=high)
self.assertEqual(high, s1.priority)
self.assertEqual(torch.device('cuda:1'), s1.device)
@unittest.skipIf(not TEST_MULTIGPU, "multi-GPU not supported")
def test_tensor_device(self):
self.assertEqual(torch.cuda.FloatTensor(1).get_device(), 0)
self.assertEqual(torch.cuda.FloatTensor(1, device=1).get_device(), 1)
with torch.cuda.device(1):
self.assertEqual(torch.cuda.FloatTensor(1).get_device(), 1)
self.assertEqual(torch.cuda.FloatTensor(1, device=0).get_device(), 0)
self.assertEqual(torch.cuda.FloatTensor(1, device=None).get_device(), 1)
def test_events(self):
stream = torch.cuda.current_stream()
event = torch.cuda.Event(enable_timing=True)
self.assertTrue(event.query())
start_event = torch.cuda.Event(enable_timing=True)
stream.record_event(start_event)
torch.cuda._sleep(int(50 * get_cycles_per_ms()))
stream.record_event(event)
self.assertFalse(event.query())
event.synchronize()
self.assertTrue(event.query())
self.assertGreater(start_event.elapsed_time(event), 0)
@staticmethod
def _stream_synchronize(self, spin_time_cycles):
s = torch.cuda.current_stream()
e_tik = torch.cuda.Event(enable_timing=True)
e_tok = torch.cuda.Event(enable_timing=True)
e_tik.record(s)
torch.cuda._sleep(spin_time_cycles)
e_tok.record(s)
s.synchronize()
self.assertTrue(s.query())
# not necessary to check e_tik and e_tok, as elapsed_time would throw
# exception if otherwise.
return e_tik.elapsed_time(e_tok)
@staticmethod
def _event_synchronize(self, spin_time_cycles):
s = torch.cuda.current_stream()
e_tik = torch.cuda.Event(enable_timing=True)
e_tok = torch.cuda.Event(enable_timing=True)
e_tik.record(s)
torch.cuda._sleep(spin_time_cycles)
s.record_event(e_tok)
e_tok.synchronize()
self.assertTrue(s.query())
# not necessary to check e_tik and e_tok, as elapsed_time would throw
# exception if otherwise.
return e_tik.elapsed_time(e_tok)
@staticmethod
def _event_wait(self, spin_time_cycles):
s0 = torch.cuda.current_stream()
s1 = torch.cuda.Stream()
e_tik = torch.cuda.Event(blocking=True, enable_timing=True)
e_tok = torch.cuda.Event(blocking=True, enable_timing=True)
e_tik.record(s0)
torch.cuda._sleep(spin_time_cycles - 10)
e_sync = torch.cuda.Event(blocking=True)
e_sync.record()
e_sync.wait(s1)
with torch.cuda.stream(s1):
torch.cuda._sleep(10)
s1.synchronize()
s1.record_event(e_tok)
self.assertTrue(s0.query())
self.assertTrue(s1.query())
self.assertTrue(e_sync.query())
# not necessary to check e_tik and e_tok, as elapsed_time would throw
# exception if otherwise.
return e_tik.elapsed_time(e_tok)
@staticmethod
def _test_stream_event_nogil(self, sync_func, p2c, c2p):
with torch.cuda.device('cuda:1'):
c2p.put(0)
p2c.get()
c2p.put(sync_func(self, TestCuda.FIFTY_MIL_CYCLES))
@unittest.skipIf(not TEST_MULTIGPU, "detected only one GPU")
# Flaky on the ROCm CI
@skipIfRocm
def test_stream_event_nogil(self):
for sync_func in [TestCuda._stream_synchronize,
TestCuda._event_synchronize,
TestCuda._event_wait]:
p2c = queue.Queue()
c2p = queue.Queue()
e_tik = torch.cuda.Event(enable_timing=True)
e_tok = torch.cuda.Event(enable_timing=True)
t = threading.Thread(
target=TestCuda._test_stream_event_nogil,
args=(self, sync_func, p2c, c2p))
t.daemon = True
t.start()
c2p.get()
with torch.cuda.device('cuda:0'):
e_tik.record()
p2c.put(0)
parent_time = sync_func(self, TestCuda.FIFTY_MIL_CYCLES)
child_time = c2p.get()
e_tok.record()
e_tok.synchronize()
total_time = e_tik.elapsed_time(e_tok)
# Without GIL, synchronizations in parent and child threads can
# overlap. The total execution time should be a little bit longer
# than spinning fifty million cycles and much shorter than twice of
# that. However, testing absolute execution time is not reliable as
# it may vary on different hardware in different environments.
# Therefore, this test uses relative comparisons, checking if the
# sum of parent and child threads execution time is greater than the
# real execution time by least 40%.
self.assertGreater(parent_time + child_time, total_time * 1.4)
@unittest.skipIf(not TEST_MULTIGPU, "detected only one GPU")
def test_events_wait(self):
d0 = torch.device('cuda:0')
d1 = torch.device('cuda:1')
torch.cuda.synchronize(d0)
torch.cuda.synchronize(d1)
with torch.cuda.device(d0):
s0 = torch.cuda.current_stream()
torch.cuda._sleep(TestCuda.FIFTY_MIL_CYCLES)
e0 = torch.cuda.Event()
s0.record_event(e0)
with torch.cuda.device(d1):
s1 = torch.cuda.current_stream()
self.assertFalse(s0.query())
self.assertTrue(s1.query())
s1.wait_event(e0)
s1.synchronize()
self.assertTrue(e0.query())
self.assertTrue(s0.query())
self.assertTrue(s1.query())
@unittest.skipIf(not TEST_MULTIGPU, "detected only one GPU")
def test_events_multi_gpu_query(self):
d0 = torch.device('cuda:0')
d1 = torch.device('cuda:1')
with torch.cuda.device(d0):
s0 = torch.cuda.current_stream()
e0 = s0.record_event()
s0.synchronize()
with torch.cuda.device(d1):
s1 = torch.cuda.current_stream()
torch.cuda._sleep(TestCuda.FIFTY_MIL_CYCLES)
e1 = s1.record_event()
self.assertTrue(e0.query())
self.assertFalse(e1.query())
with torch.cuda.device(d0):
self.assertTrue(e0.query())
self.assertFalse(e1.query())
with torch.cuda.device(d1):
self.assertTrue(e0.query())
self.assertFalse(e1.query())
# deliberately using a different device
with torch.cuda.device(d0):
e1.synchronize()
self.assertTrue(e0.query())
self.assertTrue(e1.query())
with torch.cuda.device(d0):
self.assertTrue(e0.query())
self.assertTrue(e1.query())
with torch.cuda.device(d1):
self.assertTrue(e0.query())
self.assertTrue(e1.query())
@unittest.skipIf(not TEST_MULTIGPU, "detected only one GPU")
@skipIfRocm
def test_events_multi_gpu_elapsed_time(self):
d0 = torch.device('cuda:0')
d1 = torch.device('cuda:1')
with torch.cuda.device(d0):
s0 = torch.cuda.current_stream()
e0 = torch.cuda.Event(enable_timing=True)
torch.cuda._sleep(10)
s0.record_event(e0)
with torch.cuda.device(d1):
s1 = torch.cuda.current_stream()
e1 = torch.cuda.Event(enable_timing=True)
torch.cuda._sleep(TestCuda.FIFTY_MIL_CYCLES)
s1.record_event(e1)
e0.synchronize()
e1.synchronize()
with torch.cuda.device(d0):
with self.assertRaises(RuntimeError):
self.assertGreater(e0.elapsed_time(e1), 0)
with torch.cuda.device(d1):
with self.assertRaises(RuntimeError):
self.assertGreater(e0.elapsed_time(e1), 0)
with torch.cuda.device(d0):
s0 = torch.cuda.current_stream()
e2 = torch.cuda.Event(enable_timing=True)
torch.cuda._sleep(TestCuda.FIFTY_MIL_CYCLES)
s0.record_event(e2)
s0.synchronize()
self.assertGreater(e0.elapsed_time(e2), 0)
# deliberately calling from a different device
with torch.cuda.device(d1):
self.assertGreater(e0.elapsed_time(e2), 0)
def test_record_stream(self):
cycles_per_ms = get_cycles_per_ms()
t = torch.FloatTensor([1, 2, 3, 4]).pin_memory()
result = torch.cuda.FloatTensor(t.size())
stream = torch.cuda.Stream()
ptr = [None]
# Performs the CPU->GPU copy in a background stream
def perform_copy():
with torch.cuda.stream(stream):
tmp = t.cuda(non_blocking=True)
ptr[0] = tmp.data_ptr()
torch.cuda.current_stream().wait_stream(stream)
tmp.record_stream(torch.cuda.current_stream())
torch.cuda._sleep(int(50 * cycles_per_ms)) # delay the copy
result.copy_(tmp)
perform_copy()
with torch.cuda.stream(stream):
tmp2 = torch.cuda.FloatTensor(t.size())
tmp2.zero_()
self.assertNotEqual(tmp2.data_ptr(), ptr[0], 'allocation re-used to soon')
self.assertEqual(result.tolist(), [1, 2, 3, 4])
# Check that the block will be re-used after the main stream finishes
torch.cuda.current_stream().synchronize()
with torch.cuda.stream(stream):
tmp3 = torch.cuda.FloatTensor(t.size())
self.assertEqual(tmp3.data_ptr(), ptr[0], 'allocation not re-used')
def test_record_stream_on_shifted_view(self):
# See issue #27366
# This test detects unexpected block reallocation. For reliable test,
# the stream to allocate tensors is isolated. The allocator will not
# reuse free blocks which were allocated from another stream.
stream_alloc = torch.cuda.Stream()
with torch.cuda.stream(stream_alloc):
base = torch.cuda.FloatTensor([10, 10])
# Record another stream on a shifted view tensor.
view = base[5:]
assert view.storage_offset() > 0
stream_record = torch.cuda.Stream()
with torch.cuda.stream(stream_record):
torch.cuda._sleep(int(50 * get_cycles_per_ms()))
view.record_stream(stream_record)
# Delete those tensors to make the block free soon.
data_ptr = base.data_ptr()
del base, view
# A new tensor should not be allocated to the block above.
stream_alloc.synchronize()
with torch.cuda.stream(stream_alloc):
try_realloc = torch.cuda.FloatTensor([10, 10])
self.assertNotEqual(try_realloc.data_ptr(), data_ptr)
def test_noncontiguous_pinned_memory(self):
# See issue #3266
x = torch.arange(0, 10).view((2, 5))
self.assertEqual(x.t(), x.t().pin_memory())
def test_caching_pinned_memory(self):
cycles_per_ms = get_cycles_per_ms()
# check that allocations are re-used after deletion
t = torch.FloatTensor([1]).pin_memory()
ptr = t.data_ptr()
del t
t = torch.FloatTensor([1]).pin_memory()
self.assertEqual(t.data_ptr(), ptr, 'allocation not reused')
# check that the allocation is not re-used if it's in-use by a copy
gpu_tensor = torch.cuda.FloatTensor([0])
torch.cuda._sleep(int(50 * cycles_per_ms)) # delay the copy
gpu_tensor.copy_(t, non_blocking=True)
del t
t = torch.FloatTensor([1]).pin_memory()
self.assertNotEqual(t.data_ptr(), ptr, 'allocation re-used too soon')
self.assertEqual(list(gpu_tensor), [1])
@unittest.skipIf(not TEST_MULTIGPU, "only one GPU detected")
def test_caching_pinned_memory_multi_gpu(self):
# checks that the events preventing pinned memory from being re-used
# too early are recorded on the correct GPU
cycles_per_ms = get_cycles_per_ms()
t = torch.FloatTensor([1]).pin_memory()
ptr = t.data_ptr()
gpu_tensor0 = torch.cuda.FloatTensor([0], device=0)
gpu_tensor1 = torch.cuda.FloatTensor([0], device=1)
with torch.cuda.device(1):
torch.cuda._sleep(int(50 * cycles_per_ms)) # delay the copy
gpu_tensor1.copy_(t, non_blocking=True)
del t
t = torch.FloatTensor([2]).pin_memory()
self.assertNotEqual(t.data_ptr(), ptr, 'allocation re-used too soon')
with torch.cuda.device(0):
gpu_tensor0.copy_(t, non_blocking=True)
self.assertEqual(gpu_tensor1[0], 1)
self.assertEqual(gpu_tensor0[0], 2)
def test_caching_allocator_record_stream_oom(self):
"""allocations delayed by a record_stream call should still be freed on
an out-of-memory in cuda_malloc_retry. see issue #19219"""
stream = torch.cuda.Stream()
with torch.cuda.stream(stream):
y = torch.zeros(40 * 1024 * 1024, device='cuda')
for _ in range(100):
x = torch.empty(40 * 1024 * 1024, device='cuda')
with torch.cuda.stream(stream):
y += x
# delays re-use of `x` until after all operations in `stream`
x.record_stream(stream)
del x
# we've made a mess by allocating up to the device capacity. free any
# cached blocks in case it affects future tests.
torch.cuda.empty_cache()
# Tests for historic illegal memory access, see #17040.
def test_reduction_gpu_memory_accessing(self):
x = torch.ones(512, 8, dtype=torch.float32, device='cuda')
torch.sum(x, 0)
def test_sum_fp16(self):
x = torch.zeros(10, device='cuda', dtype=torch.float16)
self.assertEqual(x.sum(), 0)
x = torch.ones(65504, device='cuda', dtype=torch.float16)
self.assertEqual(x.sum(), 65504)
self.assertEqual(x.sum(dtype=torch.float32), 65504)
x = torch.ones(65536, device='cuda', dtype=torch.float16)
self.assertEqual(x.sum(dtype=torch.float32), 65536)
a = torch.zeros(1203611).bernoulli_(0.0005)
x = a.to(device='cuda', dtype=torch.float16)
self.assertEqual(x.sum().item(), a.sum().item())
a = torch.zeros(100, 121, 80).bernoulli_(0.0005)
x = a.to(device='cuda', dtype=torch.float16)
self.assertEqual(x.sum((0, 2)).float().cpu(), a.sum((0, 2)))
def test_mean_fp16(self):
x = torch.ones(65536, device='cuda', dtype=torch.float16)
self.assertEqual(x.mean(), 1)
x = torch.ones(65536, device='cuda', dtype=torch.float16)
self.assertEqual(x.mean(dtype=torch.float32), 1)
def test_prod_large(self):
# tests global reduction (should_global_reduce = true) in case of non-zero identity element
x = torch.ones(240000, device='cuda', dtype=torch.float32)
self.assertEqual(x.prod(), 1)
@skipIfRocm
def test_fft_ifft_rfft_irfft(self):
_TestTorchMixin._test_fft_ifft_rfft_irfft(self, device=torch.device('cuda'))
@contextmanager
def plan_cache_max_size(n, device=None):
if device is None:
plan_cache = torch.backends.cuda.cufft_plan_cache
else:
plan_cache = torch.backends.cuda.cufft_plan_cache[device]
original = plan_cache.max_size
plan_cache.max_size = n
yield
plan_cache.max_size = original
with plan_cache_max_size(max(1, torch.backends.cuda.cufft_plan_cache.size - 10)):
_TestTorchMixin._test_fft_ifft_rfft_irfft(self, device=torch.device('cuda'))
with plan_cache_max_size(0):
_TestTorchMixin._test_fft_ifft_rfft_irfft(self, device=torch.device('cuda'))
torch.backends.cuda.cufft_plan_cache.clear()
# check that stll works after clearing cache
with plan_cache_max_size(10):
_TestTorchMixin._test_fft_ifft_rfft_irfft(self, device=torch.device('cuda'))
with self.assertRaisesRegex(RuntimeError, r"must be non-negative"):
torch.backends.cuda.cufft_plan_cache.max_size = -1
with self.assertRaisesRegex(RuntimeError, r"read-only property"):
torch.backends.cuda.cufft_plan_cache.size = -1
with self.assertRaisesRegex(RuntimeError, r"but got device with index"):
torch.backends.cuda.cufft_plan_cache[torch.cuda.device_count() + 10]
if TEST_MULTIGPU:
# Test that different GPU has different cache
x0 = torch.randn(2, 3, 3, device='cuda:0')
x1 = x0.cuda(1)
self.assertEqual(x0.rfft(2), x1.rfft(2))
# If a plan is used across different devices, the following line (or
# the assert above) would trigger illegal memory access. Other ways
# to trigger the error include
# (1) setting CUDA_LAUNCH_BLOCKING=1 (pytorch/pytorch#19224) and
# (2) printing a device 1 tensor.
x0.copy_(x1)
# Test that un-indexed `torch.backends.cuda.cufft_plan_cache` uses current device
with plan_cache_max_size(10, device='cuda:0'):
with plan_cache_max_size(11, device='cuda:1'):
self.assertEqual(torch.backends.cuda.cufft_plan_cache[0].max_size, 10)
self.assertEqual(torch.backends.cuda.cufft_plan_cache[1].max_size, 11)
self.assertEqual(torch.backends.cuda.cufft_plan_cache.max_size, 10) # default is cuda:0
with torch.cuda.device(1):
self.assertEqual(torch.backends.cuda.cufft_plan_cache.max_size, 11) # default is cuda:1
with torch.cuda.device(0):
self.assertEqual(torch.backends.cuda.cufft_plan_cache.max_size, 10) # default is cuda:0
self.assertEqual(torch.backends.cuda.cufft_plan_cache[0].max_size, 10)
with torch.cuda.device(1):
with plan_cache_max_size(11): # default is cuda:1
self.assertEqual(torch.backends.cuda.cufft_plan_cache[0].max_size, 10)
self.assertEqual(torch.backends.cuda.cufft_plan_cache[1].max_size, 11)
self.assertEqual(torch.backends.cuda.cufft_plan_cache.max_size, 11) # default is cuda:1
with torch.cuda.device(0):
self.assertEqual(torch.backends.cuda.cufft_plan_cache.max_size, 10) # default is cuda:0
self.assertEqual(torch.backends.cuda.cufft_plan_cache.max_size, 11) # default is cuda:1
def test_multinomial_ext(self):
# Test two corner cases from older PyTorch (Issue #4858)
freqs = torch.cuda.FloatTensor([
0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
0.03178183361887932, 0.027680952101945877, 0.033176131546497345,
0.046052902936935425, 0.07742464542388916, 0.11543981730937958,
0.14148041605949402, 0.15784293413162231, 0.13180233538150787,
0.08271478116512299, 0.049702685326337814, 0.027557924389839172,
0.018125897273421288, 0.011851548217236996, 0.010252203792333603,
0.007422595750540495, 0.005372154992073774, 0.0045109698548913,
0.0036087757907807827, 0.0035267581697553396, 0.0018864056328311563,
0.0024605290964245796, 0.0022964938543736935, 0.0018453967059031129,
0.0010662291897460818, 0.0009842115687206388, 0.00045109697384759784,
0.0007791675161570311, 0.00020504408166743815, 0.00020504408166743815,
0.00020504408166743815, 0.00012302644609007984, 0.0,
0.00012302644609007984, 4.100881778867915e-05, 0.0, 0.0, 0.0, 0.0,
0.0, 0.0])
torch.cuda.manual_seed(11042)
sample = torch.multinomial(freqs, 1000, True)
self.assertNotEqual(freqs[sample].min(), 0)
p = torch.zeros(3421, 2, device="cuda", dtype=torch.float)
p[:, 1] = 1
torch.cuda.manual_seed(5214)
r = torch.multinomial(p, 1)
self.assertNotEqual(r.min().item(), 0)
# test corner case from Issue #13867
torch.cuda.manual_seed(33)
probs = torch.randn(1000000, device='cuda').clamp(min=0) * 3e-5
samples = probs.multinomial(1000000, replacement=True)
self.assertGreater(probs[samples].min().item(), 0)
@staticmethod
def mute():
os.dup2(os.open(os.devnull, os.O_WRONLY), sys.stderr.fileno())
def _spawn_method(self, method, arg):
ctx = mp.get_context("spawn")
with ctx.Pool(1, initializer=self.mute) as pool:
errors = pool.map(method, [arg])
for e in errors:
if 'device-side assert triggered' not in str(e):
self.fail(e)
@staticmethod
def _test_multinomial_invalid_probs_cuda(probs):
try:
with torch.random.fork_rng(devices=[0]):
torch.multinomial(probs.to('cuda'), 2)
torch.cuda.synchronize()
return False # Should not be reached
except RuntimeError as e:
return e
@slowTest
@unittest.skipIf(NO_MULTIPROCESSING_SPAWN, "Disabled for environments that \
don't support multiprocessing with spawn start method")
@unittest.skipIf(IS_WINDOWS, 'FIXME: CUDA OOM error on Windows')
@unittest.skipIf(not PY3,
"spawn start method is not supported in Python 2, \
but we need it for creating another process with CUDA")
@skipIfRocm
def test_multinomial_invalid_probs_cuda(self):
test_method = TestCuda._test_multinomial_invalid_probs_cuda
self._spawn_method(test_method, torch.Tensor([1, -1, 1]))
self._spawn_method(test_method, torch.Tensor([1, inf, 1]))
self._spawn_method(test_method, torch.Tensor([1, -inf, 1]))
self._spawn_method(test_method, torch.Tensor([1, 1, nan]))
self._spawn_method(test_method, torch.Tensor([0, 1, 0]))
@slowTest
@unittest.skipIf(not TEST_LARGE_TENSOR, "not enough memory")
def test_huge_index(self):
src = torch.empty(15000000, 45, device='cuda', dtype=torch.long).random_(0, 2**22)
idx = torch.randperm(src.shape[0], device='cuda')
res = src[idx]
res_cpu = src.cpu()[idx.cpu()]
self.assertEqual(res.cpu(), res_cpu)
def test_tensor_gather(self):
_TestTorchMixin._test_gather(self, lambda t: t.cuda(), False)
def test_tensor_scatter(self):
_TestTorchMixin._test_scatter_base(self, lambda t: t.cuda(), 'scatter_', test_bounds=False)
def test_tensor_scatterAdd(self):
_TestTorchMixin._test_scatter_base(self, lambda t: t.cuda(), 'scatter_add_', test_bounds=False)
def test_tensor_scatterFill(self):
_TestTorchMixin._test_scatter_base(self, lambda t: t.cuda(), 'scatter_', True, test_bounds=False)
def test_min_max_inits(self):
# Testing if THC_reduceAll received the correct index initialization.
# This affects the result of THC_reduceAll operations at extreme values
x = torch.cuda.ByteTensor([0])
y = torch.cuda.ByteTensor([255])
expected = torch.cuda.LongTensor([0])[0]
_, v = x.max(dim=0)
self.assertEqual(v, expected)
_, v = y.min(dim=0)
self.assertEqual(v, expected)
@unittest.skipIf(not TEST_MULTIGPU, "only one GPU detected")
def test_get_set_rng_state_all(self):
states = torch.cuda.get_rng_state_all()
before0 = torch.cuda.FloatTensor(100, device=0).normal_()
before1 = torch.cuda.FloatTensor(100, device=1).normal_()
torch.cuda.set_rng_state_all(states)
after0 = torch.cuda.FloatTensor(100, device=0).normal_()
after1 = torch.cuda.FloatTensor(100, device=1).normal_()
self.assertEqual(before0, after0, 0)
self.assertEqual(before1, after1, 0)
@skipIfRocm
def test_nvtx(self):
# Just making sure we can see the symbols
torch.cuda.nvtx.range_push("foo")
torch.cuda.nvtx.mark("bar")
torch.cuda.nvtx.range_pop()
def test_bincount_ext(self):
# ensure CUDA code coverage
input_size = (5000,)
w = torch.randn(input_size, dtype=torch.double, device='cuda')
w_cpu = w.cpu()
# test shared memory impl
t = torch.randint(50, input_size, dtype=torch.int8, device='cuda')
self.assertEqual(t.cpu().bincount(), t.bincount())
self.assertEqual(t.cpu().bincount(w_cpu), t.bincount(w))
# test multi block memory impl
# see `THRESH_NUMBER_BINS_FOR_MULTI_BLOCK_MEM` in SummaryOps.cu
t = torch.randint(500, input_size, dtype=torch.int64, device='cuda')
self.assertEqual(t.cpu().bincount(), t.bincount())
self.assertEqual(t.cpu().bincount(w_cpu), t.bincount(w))
# test global memory impl
# see `THRESH_NUMBER_BINS_FOR_GLOBAL_MEM` in SummaryOps.cu
t = torch.randint(2000, input_size, dtype=torch.int64, device='cuda')
self.assertEqual(t.cpu().bincount(), t.bincount())
self.assertEqual(t.cpu().bincount(w_cpu), t.bincount(w))
t = torch.zeros([10], dtype=torch.int32, device='cuda')
# 35488 * 65536 as int32 would cause overflow to negative value
# giving negative bin offset
t[0] = 35488
counted = t.bincount(minlength=65536)
self.assertEqual(torch.sum(counted), 10)
def test_tiny_half_norm_(self):
a = torch.arange(25).cuda().float()
a /= 100000000
b = a.half()
self.assertGreater(b.norm().item(), 0)
def test_norm_type_conversion(self):
a = torch.ones(65536).cuda().half()
self.assertEqual(a.norm(p=0, dtype=torch.float32), 65536)
# Note: This test fails on ROCm CI gfx900 but passes on gfx906
@skipIfRocm
# Test that wrap_with_cuda_memory_check successfully detects leak
def test_cuda_memory_leak_detection(self):
l = []
@self.wrap_with_cuda_memory_check
def no_leak():
pass
@self.wrap_with_cuda_memory_check
def leak_gpu0():
l.append(torch.tensor(10, device=torch.device("cuda:0")))
no_leak()
with self.assertRaisesRegex(AssertionError, r"leaked \d+ bytes CUDA memory on device 0"):
leak_gpu0()
if TEST_MULTIGPU:
@self.wrap_with_cuda_memory_check
def leak_gpu1():
l.append(torch.tensor(10, device=torch.device("cuda:1")))
with self.assertRaisesRegex(AssertionError, r"leaked \d+ bytes CUDA memory on device 1"):
leak_gpu1()
def test_cuda_memory_leak_detection_propagates_errors(self):
with self.assertRaisesRegex(RuntimeError, r"The size of tensor a \(3\) must match"):
with self.assertLeaksNoCudaTensors():
x = torch.randn(3, 1, device='cuda')
y = torch.randn(2, 1, device='cuda')
z = x + y
def test_trilu_indices(self):
for test_args in tri_tests_args:
_compare_trilu_indices(self, *test_args, device='cuda')
# test default options
x = torch.ones(
3, 3, dtype=torch.long, device='cuda', layout=torch.strided)
self.assertEqual(
x.tril(0).nonzero().transpose(0, 1),
torch.tril_indices(3, 3, device='cuda'))
self.assertEqual(
x.triu(0).nonzero().transpose(0, 1),
torch.triu_indices(3, 3, device='cuda'))
def test_large_trilu_indices(self):
for test_args in tri_large_tests_args:
_compare_large_trilu_indices(self, *test_args, device='cuda')
@unittest.skipIf(not TEST_MEDIUM_TENSOR, "not enough memory")
def test_cuda_kernel_loop_overflow(self):
# Issue #24309: In extreme cases, the loop variable could overflow and continue
# the kernel loop with a negative index, causing a RuntimeError (invalid write):
x = torch.randn(1, 1, 1, 2**30 + 1, dtype=torch.float16, device="cuda")
expected = x[0, 0, 0, 2**30]
y = torch.nn.functional.avg_pool2d(x, kernel_size=1)
torch.cuda.synchronize()
self.assertEqual(y[0, 0, 0, 2**30], expected)
@unittest.skipIf(not TEST_LARGE_TENSOR, "not enough memory")
def test_cuda_kernel_loop_overflow_large(self):
# Make sure input.numel() > INT_MAX is handled:
x = torch.randn(1, 1, 1, 2**31, dtype=torch.float16, device="cuda")
with self.assertRaisesRegex(RuntimeError, "integer out of range"):
y = torch.nn.functional.avg_pool2d(x, kernel_size=1)
# Issue #24309: In extreme cases, the loop variable could overflow and continue
# the kernel loop with a negative index, causing a RuntimeError (invalid write):
x = torch.randn(1, 1, 1, 2**31 - 1, dtype=torch.float16, device="cuda")
expected = x[0, 0, 0, 2**31 - 2]
y = torch.nn.functional.avg_pool2d(x, kernel_size=1)
torch.cuda.synchronize()
self.assertEqual(y[0, 0, 0, 2**31 - 2], expected)
@skipCUDANonDefaultStreamIf(True)
def test_streaming_backwards_sync(self):
default_stream = torch.cuda.current_stream()
stream = torch.cuda.Stream()
class MultiplyInStream(torch.autograd.Function):
@staticmethod
def forward(ctx, x):
return x * 2
@staticmethod
def backward(ctx, grad):
self.assertEqual(torch.cuda.current_stream(), stream)
# delays the operation in the the background stream
torch.cuda._sleep(1000 * 1000)
return grad * 2
x = torch.randn(5, 5, device='cuda', requires_grad=True)
with torch.cuda.stream(stream):
stream.wait_stream(default_stream)
output = MultiplyInStream.apply(x)
output.sum().backward()
self.assertEqual(x.grad, torch.ones_like(x) * 2)
self.assertEqual(torch.cuda.current_stream(), default_stream)
def test_streaming_backwards_multiple_streams(self):
class StreamModel(torch.nn.Module):
def __init__(self):
super(StreamModel, self).__init__()
self.event = torch.cuda.Event()
self.stream0 = torch.cuda.Stream()
self.stream1 = torch.cuda.Stream()
def forward(self, x):
x0 = x.clone()
torch._C._cuda_setStream(self.stream0._cdata)
y0 = x0 * 2
self.event.record(stream=torch.cuda.current_stream())
torch._C._cuda_setStream(self.stream1._cdata)
y1 = x * 3
self.stream1.wait_event(self.event)
return y0 + y1
stream = torch.cuda.Stream()
def accum_hook(grad):
self.assertEqual(torch.cuda.current_stream(), stream)
with torch.cuda.stream(stream):
x = torch.randn(5, 5, device='cuda', requires_grad=True)
x.register_hook(accum_hook)
torch.cuda.current_stream().wait_stream(stream)
model = StreamModel().cuda()
model(x).sum().backward()
self.assertEqual(x.grad, torch.ones_like(x) * 5)
@unittest.skipIf(not TEST_MULTIGPU, "only one GPU detected")
def test_streaming_backwards_device_transfer(self):
# This function must run with non-default current streams on all devices, otherwise it's meaningless.
# The intention is to test that to()'s backward (CopyBackward) interacts properly with the
# synchronization logic in torch/csrc/autograd/input_buffer.cpp.
dev0 = torch.device("cuda:0")
dev1 = torch.device("cuda:1")
# Unfortunately I need to make the tensors largeish.
# Bigger tensors = longer D2D transfers = more likely to expose races.
size = 2**26
a = torch.full((size,), 1, device=dev1, dtype=torch.float64, requires_grad=True)
b = torch.full((size,), 1, device=dev1, dtype=torch.float64, requires_grad=True)
# Here to_backward_recipient = a*b is used only once, so MulBackward's InputBuffer slot only expects 1 input.
# This tests the situation where we don't call InputBuffer::accumulate for MulBackward's InputBuffer.
to_backward_recipient = a * b
s = to_backward_recipient.to(device="cuda:0").sum()
torch.cuda.synchronize(device=dev0)
torch.cuda.synchronize(device=dev1)
s.backward()
self.assertTrue(a.grad.sum().item() == size)
self.assertTrue(b.grad.sum().item() == size)
# Here to_backward_recipient = a*b is used twice, so MulBackward's InputBuffer slot expects 2 inputs.
# This tests the situation where we do call InputBuffer::accumulate for MulBackward's InputBuffer.
a.grad = None
b.grad = None
to_backward_recipient = a * b
# Multiply by 2 here so to's backward creates gradient values that are different from the case above,
# to mitigate weirdness if the caching allocator happens to reuse memory regions that were populated
# with 1s by the case above
s0 = to_backward_recipient.to(device="cuda:0").sum() * 2.
s1 = to_backward_recipient.to(device="cuda:0").sum() * 2.
torch.cuda.synchronize(device=dev0)
torch.cuda.synchronize(device=dev1)
s0.backward(retain_graph=True)
s1.backward()
self.assertTrue(a.grad.sum().item() == 4 * size)
self.assertTrue(b.grad.sum().item() == 4 * size)
@unittest.skipIf(not TEST_MULTIGPU, "only one GPU detected")
def test_cuda_init_race(self):
# See https://github.com/pytorch/pytorch/issues/16559
import subprocess
subprocess.check_call([sys.executable, '-c', """\
import torch
import threading
def worker(rank):
torch.tensor([1.]).cuda(rank)
t1 = threading.Thread(target=worker, args=(0,))
t2 = threading.Thread(target=worker, args=(1,))
t1.start()
t2.start()
"""])
def test_grad_scaling_builtins(self, device="cuda", dtype=torch.float):
inv_scale = torch.tensor([0.25], dtype=dtype, device=device)
found_inf = torch.tensor([0.0], dtype=dtype, device=device)
g = torch.tensor([4.0], dtype=dtype, device=device)
torch._amp_non_finite_check_and_unscale_(g, found_inf, inv_scale)
self.assertEqual(found_inf, 0.0)
self.assertTrue(torch.allclose(g, torch.ones(10, dtype=torch.float32, device="cuda"), atol=1e-7))
found_inf.zero_()
g = torch.tensor([float('inf')], dtype=dtype, device=device)
torch._amp_non_finite_check_and_unscale_(g, found_inf, inv_scale)
self.assertEqual(found_inf, 1.0)
found_inf.zero_()
g = torch.tensor([float('nan')], dtype=dtype, device=device)
torch._amp_non_finite_check_and_unscale_(g, found_inf, inv_scale)
self.assertEqual(found_inf, 1.0)
growth = 2.0
backoff = 0.25
growth_interval = 2
scale = torch.tensor([4.0], dtype=dtype, device=device)
growth_tracker = torch.tensor([0], dtype=torch.int32, device=device)
found_inf.zero_()
# Simulates 2 consecutive unskipped iterations
scale = torch._amp_update_scale(growth_tracker, scale, found_inf, growth, backoff, growth_interval)
self.assertEqual(growth_tracker, 1)
self.assertEqual(scale, 4.0)
scale = torch._amp_update_scale(growth_tracker, scale, found_inf, growth, backoff, growth_interval)
self.assertEqual(growth_tracker, 0)
self.assertEqual(scale, 8.0)
# Simulates a skipped iteration
found_inf.fill_(1.0)
scale = torch._amp_update_scale(growth_tracker, scale, found_inf, growth, backoff, growth_interval)
self.assertEqual(growth_tracker, 0)
self.assertEqual(scale, 2.0)
@unittest.skipIf(not TEST_MULTIGPU, "only one GPU detected")
def test_grad_scaling_device_as_key(self):
# Ensure that different instances of "device" objects that point to the same device
# are treated as identical keys by dicts. GradScaler relies on this behavior, and may
# error otherwise in a way that's difficult to detect (a silent performance hit).
d = {}
dev0a = torch.device("cuda:0")
dev0b = torch.device("cuda:0")
dev1a = torch.device("cuda:1")
dev1b = torch.device("cuda:1")
self.assertTrue(hash(dev0a) == hash(dev0b))
self.assertTrue(hash(dev1a) == hash(dev1b))
d[dev0a] = "0a"
d[dev0b] = "0b"
self.assertTrue(len(d) == 1)
self.assertTrue(d[dev0a] == "0b")
d[dev1a] = "1a"
d[dev1b] = "1b"
self.assertTrue(len(d) == 2)
self.assertTrue(d[dev1a] == "1b")
@unittest.skipIf(not TEST_MULTIGPU, "only one GPU detected")
def test_grad_scaling_scale(self):
scaler = torch.cuda.amp.GradScaler(init_scale=2.)
t0 = torch.tensor([4.0], dtype=torch.float32, device="cuda:0")
t1 = torch.tensor([4.0], dtype=torch.float32, device="cuda:1")
# Create some nested iterables of tensors on different devices.
outputs = (t1.clone(), (t0.clone(), t1.clone()), [t0.clone(), (t1.clone(), t0.clone())])
outputs = scaler.scale(outputs)
self.assertTrue(outputs[0] == 8.0 and outputs[1][0] == 8.0 and outputs[1][1] == 8.0 and
outputs[2][0] == 8.0 and outputs[2][1][0] == 8.0 and outputs[2][1][1] == 8.0)
self.assertTrue(scaler._scale.device == t1.device)
def test_grad_scaling_state_dict(self):
for lazy_init_scale in True, False:
s0 = torch.cuda.amp.GradScaler(init_scale=3., growth_factor=4., backoff_factor=.5, growth_interval=2)
s1 = torch.cuda.amp.GradScaler(init_scale=6., growth_factor=7., backoff_factor=.8, growth_interval=1)
# sets a random value for load_state_dict to overwrite
s1._init_growth_tracker = 7
if lazy_init_scale:
# Dummy scale() call to ensure the scale tensor is lazily initialized.
s1.scale(torch.tensor([4.0], dtype=torch.float32, device="cuda:0"))
self.assertTrue(isinstance(s1._scale, torch.cuda.FloatTensor))
s1.load_state_dict(s0.state_dict())
self.assertEqual(s1.get_scale(), 3.)
self.assertEqual(s1.get_growth_factor(), 4.)
self.assertEqual(s1.get_backoff_factor(), .5)
self.assertEqual(s1.get_growth_interval(), 2)
self.assertEqual(s1._init_growth_tracker, 0)
def _create_scaling_models_optimizers(self, device="cuda"):
# Create a module+optimizer that will use scaling, and a control module+optimizer
# that will not use scaling, against which the scaling-enabled module+optimizer can be compared.
mod_control = torch.nn.Sequential(torch.nn.Linear(8, 8), torch.nn.Linear(8, 8)).to(device=device)
mod_scaling = torch.nn.Sequential(torch.nn.Linear(8, 8), torch.nn.Linear(8, 8)).to(device=device)
for c, s in zip(mod_control.parameters(), mod_scaling.parameters()):
s.data.copy_(c.data)
opt_control = torch.optim.SGD(mod_control.parameters(), lr=1.0)
opt_scaling = torch.optim.SGD(mod_scaling.parameters(), lr=1.0)
return mod_control, mod_scaling, opt_control, opt_scaling
def _create_scaling_case(self, device="cuda", dtype=torch.float):
data = [(torch.randn((8, 8), dtype=dtype, device=device), torch.randn((8, 8), dtype=dtype, device=device)),
(torch.randn((8, 8), dtype=dtype, device=device), torch.randn((8, 8), dtype=dtype, device=device)),
(torch.randn((8, 8), dtype=dtype, device=device), torch.randn((8, 8), dtype=dtype, device=device)),
(torch.randn((8, 8), dtype=dtype, device=device), torch.randn((8, 8), dtype=dtype, device=device))]
loss_fn = torch.nn.MSELoss().cuda()
skip_iter = 2
return self._create_scaling_models_optimizers(device=device) + (data, loss_fn, skip_iter)
# _run_scaling_case generalizes some single-optimizer test logic to avoid too much copy-pasting below.
def _run_scaling_case(self, run, unskipped, skipped):
# Ensure scaling can be disabled without changing user control flow.
for enabled in True, False:
mod_control, mod_scaling, opt_control, opt_scaling, data, loss_fn, skip_iter = self._create_scaling_case()
# For functionality, test with a modest initial scale, and an unrealistically-large growth factor
# so any potential errors with the growth factor handling will be magnified.
scaler = torch.cuda.amp.GradScaler(init_scale=128., growth_factor=2.0, enabled=enabled, growth_interval=1)
run(data, mod_control, opt_control, scaler, loss_fn, skip_iter, False)
run(data, mod_scaling, opt_scaling, scaler, loss_fn, skip_iter, True)
# If scaling was enabled, the scale factor should have been multiplied by the growth factor
# len(data) - skipped times and the backoff factor "skipped" times.
if enabled:
net_growth = scaler.get_growth_factor()**unskipped if unskipped > 0 else 1.0
net_backoff = scaler.get_backoff_factor()**skipped if skipped > 0 else 1.0
self.assertTrue(scaler.get_scale() == (128. * net_growth * net_backoff))
else:
self.assertTrue(scaler.get_scale() == 1.0)
for c, s in zip(mod_control.parameters(), mod_scaling.parameters()):
self.assertTrue(torch.allclose(c, s, atol=1e-7))
def test_grad_scaling_clipping(self):
def run(data, model, optimizer, scaler, loss_fn, skip_iter, try_scaling_api):
max_norm = 0.2 # A reasonable value that actually has an effect, based on printouts of grads
for i, (input, target) in enumerate(data):
optimizer.zero_grad()
output = model(input)
loss = loss_fn(output, target)
if try_scaling_api:
scaler.scale(loss).backward()
torch.nn.utils.clip_grad_norm_(model.parameters(), max_norm * scaler.get_scale())
if i == skip_iter and scaler.is_enabled():
model[1].weight.grad.data.fill_(float('inf'))
scaler.step(optimizer)
scaler.update()
else:
loss.backward()
torch.nn.utils.clip_grad_norm_(model.parameters(), max_norm)
if (not scaler.is_enabled()) or (i != skip_iter):
optimizer.step()
self._run_scaling_case(run, unskipped=3, skipped=1)
def test_grad_scaling_clipping_separate_unscale(self):
def run(data, model, optimizer, scaler, loss_fn, skip_iter, try_scaling_api):
max_norm = 0.2 # A reasonable value that actually has an effect, based on printouts of grads
for i, (input, target) in enumerate(data):
optimizer.zero_grad()
output = model(input)
loss = loss_fn(output, target)
if try_scaling_api:
scaler.scale(loss).backward()
if i == skip_iter and scaler.is_enabled():
model[1].weight.grad.data.fill_(float('inf'))
scaler.unscale_(optimizer)
torch.nn.utils.clip_grad_norm_(model.parameters(), max_norm)
scaler.step(optimizer)
scaler.update()
else:
loss.backward()
torch.nn.utils.clip_grad_norm_(model.parameters(), max_norm)
if (not scaler.is_enabled()) or (i != skip_iter):
optimizer.step()
self._run_scaling_case(run, unskipped=3, skipped=1)
def test_grad_scaling_penalty(self):
def run(data, model, optimizer, scaler, loss_fn, skip_iter, try_scaling_api):
for i, (input, target) in enumerate(data):
optimizer.zero_grad()
output = model(input)
loss = loss_fn(output, target)
if try_scaling_api:
grad_params = torch.autograd.grad(scaler.scale(loss),
model.parameters(), create_graph=True)
inv_scale = 1. / scaler.get_scale()
grad_params = [p * inv_scale for p in grad_params]
else:
grad_params = torch.autograd.grad(loss, model.parameters(), create_graph=True)
grad_norm = 0
for grad in grad_params:
grad_norm += grad.pow(2).sum()
grad_norm = grad_norm.sqrt()
loss = loss + grad_norm
if try_scaling_api:
scaler.scale(loss).backward()
if i == skip_iter and scaler.is_enabled():
model[1].weight.grad.data.fill_(float('inf'))
scaler.step(optimizer)
scaler.update()
else:
loss.backward()
if (not scaler.is_enabled()) or (i != skip_iter):
optimizer.step()
self._run_scaling_case(run, unskipped=3, skipped=1)
def test_grad_scaling_accumulation(self):
def run(data, model, optimizer, scaler, loss_fn, skip_iter, try_scaling_api):
iters_to_accumulate = 2
for i, (input, target) in enumerate(data):
output = model(input)
loss = loss_fn(output, target)
loss = loss / iters_to_accumulate
if try_scaling_api:
scaler.scale(loss).backward()
else:
loss.backward()
if (i + 1) % iters_to_accumulate == 0:
if try_scaling_api:
scaler.step(optimizer)
scaler.update()
optimizer.zero_grad()
else:
optimizer.step()
optimizer.zero_grad()
self._run_scaling_case(run, unskipped=2, skipped=0)
def test_grad_scaling_multiple(self):
# Tests gradient scaling with 2 models and 2 optimizers that both receive gradients from 2 losses.
# Some of the logic here cannot reuse the generic helper functions created for the 1-optimizer cases.
for enabled in True, False:
mod_control0, mod_scaling0, opt_control0, opt_scaling0, data, loss_fn, skip_iter = \
self._create_scaling_case()
mod_control1, mod_scaling1, opt_control1, opt_scaling1 = \
self._create_scaling_models_optimizers()
scaler = torch.cuda.amp.GradScaler(init_scale=128., growth_factor=2.0, enabled=enabled, growth_interval=1)
def run(model0, model1, optimizer0, optimizer1, try_scaling_api):
for i, (input, target) in enumerate(data):
optimizer0.zero_grad()
optimizer1.zero_grad()
output0 = model0(input)
output1 = model1(input)
loss0 = loss_fn(0.3 * output0 + 0.7 * output1, target)
loss1 = loss_fn(0.6 * output0 - 0.4 * output1, target)
if try_scaling_api:
scaler.scale(loss0).backward(retain_graph=True)
scaler.scale(loss1).backward()
if i == skip_iter and scaler.is_enabled():
model1[1].weight.grad.data.fill_(float('inf'))
# As an additional stress test, separately unscale for one of the optimizers.
scaler.unscale_(optimizer0)
scaler.step(optimizer0)
scaler.step(optimizer1)
scaler.update()
else:
loss0.backward(retain_graph=True)
loss1.backward()
optimizer0.step()
if (not scaler.is_enabled()) or (i != skip_iter):
optimizer1.step()
run(mod_control0, mod_control1, opt_control0, opt_control1, False)
run(mod_scaling0, mod_scaling1, opt_scaling0, opt_scaling1, True)
# The loss scale should have been multiplied by the growth factor 3 times and the backoff factor once.
self.assertTrue(scaler.get_scale() == (128. * scaler.get_growth_factor()**3 *
scaler.get_backoff_factor()**1) if enabled else 1.0)
for c, s in zip(chain(mod_control0.parameters(), mod_control1.parameters()),
chain(mod_scaling0.parameters(), mod_scaling1.parameters())):
self.assertTrue(torch.allclose(c, s, atol=1e-7))
@unittest.skipIf(not TEST_MULTIGPU, "only one GPU detected")
def test_grad_scaling_multigpu(self):
# Same as above, but runs some of the models on device 1.
# GradScaler should transparently handle losses and gradients on multiple devices.
# This test could be combined with the test above, but I think it makes sense to treat
# multi-GPU operations separately.
dev0 = torch.device("cuda:0")
dev1 = torch.device("cuda:1")
for enabled in True, False:
mod_control0, mod_scaling0, opt_control0, opt_scaling0, data, loss_fn, skip_iter = \
self._create_scaling_case()
mod_control1, mod_scaling1, opt_control1, opt_scaling1 = \
self._create_scaling_models_optimizers(device=dev1)
scaler = torch.cuda.amp.GradScaler(init_scale=128., growth_factor=2.0, enabled=enabled, growth_interval=1)
def run(model0, model1, optimizer0, optimizer1, try_scaling_api):
for i, (input, target) in enumerate(data):
optimizer0.zero_grad()
optimizer1.zero_grad()
output0 = model0(input)
output1 = model1(input.to(dev1))
loss0 = loss_fn(0.3 * output0 + 0.7 * output1.to(dev0), target)
loss1 = loss_fn(0.6 * output0.to(dev1) - 0.4 * output1, target.to(dev1))
if try_scaling_api:
scaler.scale(loss0).backward(retain_graph=True)
scaler.scale(loss1).backward()
if i == skip_iter and scaler.is_enabled():
model1[1].weight.grad.data.fill_(float('inf'))
# As an additional stress test, separately unscale for one of the optimizers.
scaler.unscale_(optimizer0)
scaler.step(optimizer0)
scaler.step(optimizer1)
# Make sure the found_infs were collected properly across optimizers and devices.
if scaler.is_enabled():
self.assertTrue(len(scaler._found_inf_per_device(optimizer0)) == 1)
self.assertTrue(len(scaler._found_inf_per_device(optimizer1)) == 1)
self.assertTrue(scaler._found_inf_per_device(optimizer0)[dev0].item() == 0.)
self.assertTrue(scaler._found_inf_per_device(optimizer1)[dev1].item() ==
float(i == skip_iter))
scaler.update()
else:
loss0.backward(retain_graph=True)
loss1.backward()
optimizer0.step()
if (not scaler.is_enabled()) or (i != skip_iter):
optimizer1.step()
run(mod_control0, mod_control1, opt_control0, opt_control1, False)
run(mod_scaling0, mod_scaling1, opt_scaling0, opt_scaling1, True)
# The loss scale should have been multiplied by the growth factor 3 times and the backoff factor once.
self.assertTrue(scaler.get_scale() == (128. * scaler.get_growth_factor()**3 *
scaler.get_backoff_factor()**1) if enabled else 1.0)
# Copy mod_control1 and mod_scaling1 back the device 0 for comparison
mod_control1.to(dev0)
mod_scaling1.to(dev0)
for c, s in zip(chain(mod_control0.parameters(), mod_control1.parameters()),
chain(mod_scaling0.parameters(), mod_scaling1.parameters())):
self.assertTrue(torch.allclose(c, s, atol=1e-7))
@skipIfRocm
@unittest.skipIf(not PY3, "Barrier is unavailable before Python3")
def test_cublas_multiple_threads_same_device(self):
# Note, these parameters should be very carefully tuned
# Too small number makes it hard for the racing condition
# to happen, while too large number sometimes cause hang
size = 1024
num_threads = 2
trials = 3
test_iters = 100
weight = torch.ones((size, size), device='cuda')
results = {}
barrier = threading.Barrier(num_threads)
def _worker(t):
my_stream = torch.cuda.Stream()
# Hard sync so we don't need to worry about creating and using tensors
# across streams or the fact that default streams are thread-local.
# Those issues are not the target of this test.
torch.cuda.synchronize()
# Line up threads to increase likelihood of race conditions.
barrier.wait()
with torch.cuda.stream(my_stream):
for i in range(test_iters):
# If all threads are sharing the same cublas handle,
# the following sequence may occur:
# thread 0 calls cublasSetStream()
# thread 1 calls cublasSetStream()
# thread 0 launches its raw gemm, which it thinks is in
# its own stream, but is actually in thread 1's stream.
# thread 0 enqueues its div_, which IS is its own stream,
# but actually now races with its gemm.
results[t] = torch.mm(results[t], weight)
results[t].div_(float(size))
torch.cuda.synchronize()
for _ in range(trials):
for t in range(num_threads):
results[t] = torch.ones((size, size), device='cuda')
threads = [threading.Thread(target=_worker,
args=(t,)) for t in range(num_threads)]
for thread in threads:
thread.start()
for thread in threads:
thread.join()
for t in range(num_threads):
self.assertEqual(results[t].sum().item(), size * size)
@unittest.skipIf(not TEST_CUDNN, 'CUDNN not available')
@skipIfRocm
@unittest.skipIf(not PY3, "Barrier is unavailable before Python3")
def test_cudnn_multiple_threads_same_device(self):
# This function is intended to test the lazy creation and reuse of per-thread
# cudnn handles on each device in aten/src/ATen/cudnn/Handles.cpp.
# Failure here likely indicates something wrong with that logic.
weight = torch.ones((1, 1, 2, 2), device='cuda')
results = {}
num_threads = 2
trials = 3
test_iters = 1000
barrier = threading.Barrier(num_threads)
with torch.backends.cudnn.flags(enabled=True):
def _worker(t):
my_stream = torch.cuda.Stream()
# Hard sync so we don't need to worry about creating and using tensors
# across streams or the fact that default streams are thread-local.
# Those issues are not the target of this test.
torch.cuda.synchronize()
# Line up threads to increase likelihood of race conditions.
barrier.wait()
with torch.cuda.stream(my_stream):
for _ in range(test_iters):
# If all threads are sharing the same cudnn handle,
# the following sequence may occur:
# thread 0 calls setCuDNNStreamToCurrent()
# thread 1 calls setCuDNNStreamToCurrent()
# thread 0 launches its raw convolution, which it thinks is in
# its own stream, but is actually in thread 1's stream.
# thread 0 enqueues its div_, which IS is its own stream,
# but now races with its convolution.
results[t] = torch.nn.functional.conv2d(results[t], weight, padding=0)
results[t].div_(4.0)
torch.cuda.synchronize()
for _ in range(trials):
for t in range(num_threads):
results[t] = torch.ones((1, 1, 2048, 2048), device='cuda')
threads = [threading.Thread(target=_worker,
args=(t,)) for t in range(num_threads)]
for thread in threads:
thread.start()
for thread in threads:
thread.join()
for t in range(num_threads):
self.assertEqual(results[t].sum().item(),
(2048 - test_iters) * (2048 - test_iters))
@skipIfRocm
@unittest.skipIf(not PY3, "Barrier is unavailable before Python3")
def test_cusparse_multiple_threads_same_device(self):
size = 1024
num_threads = 2
trials = 3
test_iters = 500
def ones_sparse(size):
a = torch.arange(size, device='cuda')
indices = torch.cartesian_prod(a, a).t()
values = torch.ones(size * size, device='cuda')
return torch.sparse_coo_tensor(indices, values)
weight = ones_sparse(size)
results = {}
barrier = threading.Barrier(num_threads)
def _worker(t):
my_stream = torch.cuda.Stream()
# Hard sync so we don't need to worry about creating and using tensors
# across streams or the fact that default streams are thread-local.
# Those issues are not the target of this test.
torch.cuda.synchronize()
# Line up threads to increase likelihood of race conditions.
barrier.wait()
with torch.cuda.stream(my_stream):
for i in range(test_iters):
# If all threads are sharing the same cublas handle,
# the following sequence may occur:
# thread 0 calls cublasSetStream()
# thread 1 calls cublasSetStream()
# thread 0 launches its raw gemm, which it thinks is in
# its own stream, but is actually in thread 1's stream.
# thread 0 enqueues its div_, which IS is its own stream,
# but actually now races with its gemm.
results[t] = weight.mm(results[t])
results[t].div_(float(size))
torch.cuda.synchronize()
for _ in range(trials):
for t in range(num_threads):
results[t] = torch.ones((size, size), device='cuda')
threads = [threading.Thread(target=_worker,
args=(t,)) for t in range(num_threads)]
for thread in threads:
thread.start()
for thread in threads:
thread.join()
for t in range(num_threads):
self.assertEqual(results[t].sum().item(), size * size)
@slowTest
@unittest.skipIf(not TEST_LARGE_TENSOR, "not enough memory")
def test_max_large_axis(self):
x = torch.zeros(2**32, device='cuda', dtype=torch.int8)
x[-1] = 1
val, idx = x.max(0)
self.assertEqual(val, 1)
self.assertEqual(idx, x.shape[0] - 1)
@unittest.skipIf(not TEST_NUMPY, "Numpy not found")
def test_to_numpy(self):
self.assertRaises(TypeError, lambda: torch.empty(1, device="cuda").numpy())
if __name__ == '__main__':
run_tests()
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