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# Copyright (c) Facebook, Inc. and its affiliates.
#
# This source code is licensed under the MIT license found in the
# LICENSE file in the root directory of this source tree.
import logging
from typing import List, Optional
import torch.nn as nn
import torch.nn.functional as F
logger = logging.getLogger(__name__)
class FairseqDropout(nn.Module):
def __init__(self, p, module_name=None):
super().__init__()
self.p = p
self.module_name = module_name
self.apply_during_inference = False
def forward(self, x, inplace: bool = False):
if self.p > 0 and (self.training or self.apply_during_inference):
return F.dropout(x, p=self.p, training=True, inplace=inplace)
else:
return x
def make_generation_fast_(
self,
name: str,
retain_dropout: bool = False,
retain_dropout_modules: Optional[List[str]] = None,
**kwargs
):
if retain_dropout:
if retain_dropout_modules is not None and self.module_name is None:
logger.warning(
"Cannot enable dropout during inference for module {} "
"because module_name was not set".format(name)
)
elif (
retain_dropout_modules is None # if None, apply to all modules
or self.module_name in retain_dropout_modules
):
logger.info(
"Enabling dropout during inference for module: {}".format(name)
)
self.apply_during_inference = True
else:
logger.info("Disabling dropout for module: {}".format(name))
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