Allowed modules are stuck into dynamo's fx graph as call_module
nodes, without dynamo doing any tracing of the module. This means
during AOT trace time, hooks will fire during tracing when the
call_module is executed, but the hooks themselves will disappear
after that and not be present in the compiled program.
(worse, if they performed any tensor operations, those would get
traced so you could end up with part of the hook's functionality).
To circumvent this, there are two options for 'allowed modules' with hooks.
1) don't treat them as 'allowed' - trace into them
2) graph-break, so the module is no longer part of the dynamo trace at all
(1) will fail for users that opted into allowed modules becuase they know
their module has problems being traced by dynamo.
(2) causes graph breaks on common modules such as nn.Linear, just because they
are marked as 'allowed'.
It would help matters if we could differentiate between types of allowed modules
(A) allowed to avoid overheads - used for common ops like nn.Linear
(B) allowed to avoid dynamo graphbreaks caused by unsupported code
Ideally, we'd use method (1) for group (A) and (2) for (B).
For now, graph-break on all cases of allowed modules.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/97184
Approved by: https://github.com/jansel
Summary: Skip mobilenet_v3_large for accuracy checking to reduce
noise on the dashboard. The root cause still needs to be investigated.
mobilenet_v3_large shows random accuracy check failures with different
error values from time to time, and here are some examples:
```
cuda train mobilenet_v3_large [2023-04-04 14:54:50,990] torch._dynamo.utils: [ERROR] RMSE (res-fp64): 0.02172, (ref-fp64): 0.01068 and shape=torch.Size([960, 1, 5, 5])
[2023-04-04 14:54:50,990] torch._dynamo.utils: [ERROR] Accuracy failed for key name features.14.block.1.0.weight.grad
```
```
cuda train mobilenet_v3_large [2023-04-04 14:57:59,972] torch._dynamo.utils: [ERROR] RMSE (res-fp64): 0.07744, (ref-fp64): 0.03073 and shape=torch.Size([72, 1, 5, 5])
[2023-04-04 14:57:59,973] torch._dynamo.utils: [ERROR] Accuracy failed for key name features.4.block.1.0.weight.grad
```
One observation is turnning off cudnn in the eager mode with
`torch.backends.cudnn.enabled = False` makes the non-deterministic
behvior go away but meanwhile it fails accuaracy checking consistently.
Minifier didn't help to narrow down the error.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/98314
Approved by: https://github.com/huydhn
Since the CI exclusions are hard-coded in our script, we might as well require them to match exactly. This solved some head scratching where I was like, "this model is not obviously excluded, why is it not showing up in CI."
Signed-off-by: Edward Z. Yang <ezyang@meta.com>
Pull Request resolved: https://github.com/pytorch/pytorch/pull/92761
Approved by: https://github.com/jansel
We've already shown some promising perf result by integrating dynamo with torchxla for inference. To provide consistent UX for training and for inference, in this PR we try to enable training for dynamo/torchxla.
Training is trickier than inference and we may not expect much perf gains since
1. in training case, torchxla only generate a single combined graph for fwd/bwd/optimizer while in `torchxla_trace_once` bridge we added in dynamo, due to how AOT_Autograd works, we will generate 3 graphs: one for forward, one for backward and one for the optimizer. XLA favors larger graph to do more optimizations.
2. in training case, tracing overhead can be overlapped with computation. Tracing overhead is not as a big deal for training as for inference. After all training cares more about throughput while inference cares more about latency.
3. in training case, people can increase batch size to 'mitigate' the tracing overhead. Increase batch size does not change tracing overhead, thus it shows like the tracing overhead 'per example' reduces.
But we still want to add training support to dynamo/torchxla to make the work complete.
We added '--iterations-per-run' argument to control how may iterations we do per measure/device sync. This is to understand the impact of item 2 above.
Results:
With '--iterations-per-run' equals to 1, here are the perf numbers:
```
+-------------------------+--------------------+-------------------------+
| Model | XLA (trace once) | XLA (trace everytime) |
+=========================+====================+=========================+
| resnet18 | 0.91 | 0.959 |
+-------------------------+--------------------+-------------------------+
| resnet50 | 0.917 | 0.932 |
+-------------------------+--------------------+-------------------------+
| resnext50_32x4d | 0.912 | 0.905 |
+-------------------------+--------------------+-------------------------+
| alexnet | 1.038 | 0.974 |
+-------------------------+--------------------+-------------------------+
| mobilenet_v2 | 0.881 | 0.835 |
+-------------------------+--------------------+-------------------------+
| mnasnet1_0 | 0.903 | 0.931 |
+-------------------------+--------------------+-------------------------+
| vgg16 | 0.914 | 0.967 |
+-------------------------+--------------------+-------------------------+
| BERT_pytorch | 1.359 | 0.84 |
+-------------------------+--------------------+-------------------------+
| timm_vision_transformer | 1.288 | 0.893 |
+-------------------------+--------------------+-------------------------+
| geomean | 1.0006 | 0.913794 |
+-------------------------+--------------------+-------------------------+
```
Overall it looks like graph break indeed cause perf loss. But for BERT_pytorch and timm_vision_transformer we still see perf gain. We need do more experiments with larger '--iterations-per-run'
NOTE:
In torchbench.py I added the following code to do a few workaround:
```
from myscripts import workaround # TODO will remove this line before landing
```
Here are the content of workaround.py:
```
import torch
from torch import nn
import os
# override max_pool2d with avg_pool2d
if os.environ.get("REPLACE_MAXPOOL", "0") == "1":
torch.nn.MaxPool2d = torch.nn.AvgPool2d
```
It work around a few issues we found
1. MaxPool2d does not work for training in dynamo/torchxla: https://github.com/pytorch/torchdynamo/issues/1837 . WIP fix from Brian in https://github.com/pytorch/pytorch/pull/90226 , https://github.com/pytorch/xla/pull/4276/files (WIP)
2. recent change ( this PR https://github.com/pytorch/pytorch/pull/88697 ) in op decomposition cause batch_norm ops to fallback in torchxla. Fix from jack in https://github.com/pytorch/xla/pull/4282#event-7969608134 . (confirmed the fix after adding Deduper to handle duplicated return from fx graph generated by AOTAutograd)
3. we have issue to handle dropout because of random seed out of sync issue. Here is the fix: https://github.com/pytorch/xla/pull/4293 (confirmed the fix)
Example command:
```
REPLACE_MAXPOOL=1 USE_FAKE_TENSOR=0 GPU_NUM_DEVICES=1 python benchmarks/dynamo/torchbench.py --randomize-input --performance --trace-on-xla --training --backend=aot_torchxla_trace_once --only vgg16
```
Pull Request resolved: https://github.com/pytorch/pytorch/pull/88449
Approved by: https://github.com/wconstab, https://github.com/qihqi, https://github.com/malfet
Moving to train mode for TIMM models and also raising batch size for accuracy testing.
Raising batch size seems to remove a lot of noise/instability coming from batch_norm decomposition.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/89780
Approved by: https://github.com/ngimel
Summary:
This Diff ports the torchbench.py script from torchdynamo to torchbench to support the development of internal models.
Currently, only works with the `--only` option, and can only test one model at a time.
Note that the noisy logs are from upstream model code, not the benchmark code.
In the internal environment, `torch._dynamo.config.base_dir` is not writable, so we add an option to specify the output directory.
Test Plan:
```
$ buck2 run mode/opt //caffe2/benchmarks/dynamo:torchbench -- --performance --only ads_dhen_5x --part over --output-directory /tmp/tb-test/
cuda eval ads_dhen_5x
1/ 1 +0 frames 2s 1 graphs 1 graph calls 412/ 411 = 100% ops 100% time
```
```
$ buck2 run mode/opt //caffe2/benchmarks/dynamo:torchbench -- --performance --only cmf_10x --part over --output-directory /tmp/tb-test/
cuda eval cmf_10x
1/ 1 +0 frames 1s 1 graphs 1 graph calls 306/ 305 = 100% ops 100% time
```
Reviewed By: jansel
Differential Revision: D41294311
Pull Request resolved: https://github.com/pytorch/pytorch/pull/89239
Approved by: https://github.com/jansel
