mirror of
https://github.com/zebrajr/pytorch.git
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ce3094f5f6
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/70482
Test Plan: Imported from OSS
Reviewed By: anjali411
Differential Revision: D33767862
Pulled By: mikaylagawarecki
fbshipit-source-id: 8e2e9c986d5a3774093a79755940372945f1b3a9
(cherry picked from commit baea537277)
106 lines
3.9 KiB
Python
106 lines
3.9 KiB
Python
from typing import List, Dict, Optional
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import torch
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import torch.optim._functional as F
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from torch import Tensor
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# Define a TorchScript compatible Functional RMSprop Optimizer
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# where we use these optimizer in a functional way.
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# Instead of using the `param.grad` when updating parameters,
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# we explicitly allow the distributed optimizer pass gradients to
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# the `step` function. In this way, we could separate the gradients
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# and parameters and allow multithreaded trainer to update the
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# parameters without data traces on accumulating to the same .grad.
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# NOTE: This should be only used by distributed optimizer internals
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# and not meant to expose to the user.
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@torch.jit.script
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class _FunctionalRMSprop(object):
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def __init__(
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self,
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params: List[Tensor],
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lr: float = 1e-2,
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alpha: float = 0.99,
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eps: float = 1e-8,
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weight_decay: float = 0.0,
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momentum: float = 0.0,
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centered: bool = False,
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foreach: bool = False,
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_allow_empty_param_list: bool = False,
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):
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self.defaults = {
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"lr": lr,
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"alpha": alpha,
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"eps": eps,
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"weight_decay": weight_decay,
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"momentum": momentum,
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}
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self.centered = centered
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self.foreach = foreach
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if len(params) == 0 and not _allow_empty_param_list:
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raise ValueError("optimizer got an empty parameter list")
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# NOTE: we only have one param_group and don't allow user to add additional
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# param group as it's not a common use case.
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self.param_group = {"params": params}
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self.state = torch.jit.annotate(Dict[torch.Tensor, Dict[str, torch.Tensor]], {})
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def step(self, gradients: List[Optional[Tensor]]):
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params = self.param_group['params']
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params_with_grad = []
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grads = []
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square_avgs = []
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grad_avgs = []
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momentum_buffer_list = []
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lr = self.defaults['lr']
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alpha = self.defaults['alpha']
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eps = self.defaults['eps']
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momentum = self.defaults['momentum']
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weight_decay = self.defaults['weight_decay']
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if len(params) != len(gradients):
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raise ValueError(
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"the gradients passed in does not equal to the size of the parameters!"
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+ f"Params length: {len(params)}. "
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+ f"Gradients length: {len(gradients)}"
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)
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for param, gradient in zip(params, gradients):
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if gradient is not None:
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params_with_grad.append(param)
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grads.append(gradient)
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# Lazy state initialization
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if param not in self.state:
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self.state[param] = {}
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state = self.state[param]
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state['step'] = torch.tensor(0.0)
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state['square_avg'] = torch.zeros_like(param, memory_format=torch.preserve_format)
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if momentum > 0:
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state['momentum_buffer'] = torch.zeros_like(param, memory_format=torch.preserve_format)
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if self.centered:
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state['grad_avg'] = torch.zeros_like(param, memory_format=torch.preserve_format)
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state = self.state[param]
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square_avgs.append(state['square_avg'])
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if momentum > 0:
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momentum_buffer_list.append(state['momentum_buffer'])
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if self.centered:
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grad_avgs.append(state['grad_avg'])
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state['step'] += 1
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with torch.no_grad():
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F.rmsprop(params_with_grad,
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grads,
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square_avgs,
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grad_avgs,
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momentum_buffer_list,
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lr=lr,
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alpha=alpha,
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eps=eps,
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weight_decay=weight_decay,
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momentum=momentum,
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centered=self.centered,
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foreach=self.foreach)
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