29 lines
823 B
Python
29 lines
823 B
Python
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# Copyright (c) Meta Platforms, Inc. and affiliates.
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# All rights reserved.
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#
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# This source code is licensed under the license found in the
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# LICENSE file in the root directory of this source tree.
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# Modified from: https://github.com/huggingface/pytorch-image-models/blob/main/timm/models/vision_transformer.py#L103-L110
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from typing import Union
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import torch
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from torch import Tensor
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from torch import nn
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class LayerScale(nn.Module):
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def __init__(
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self,
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dim: int,
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init_values: Union[float, Tensor] = 1e-5,
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inplace: bool = False,
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) -> None:
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super().__init__()
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self.inplace = inplace
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self.gamma = nn.Parameter(init_values * torch.ones(dim))
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def forward(self, x: Tensor) -> Tensor:
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return x.mul_(self.gamma) if self.inplace else x * self.gamma
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