wehub-resource-sync
26 lines
706 B
Python
26 lines
706 B
Python
# Copyright (c) Facebook, Inc. and its affiliates.
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#
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# This source code is licensed under the MIT license found in the
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# LICENSE file in the root directory of this source tree.
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"""
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See "Gaussian Error Linear Units (GELUs)" by Dan Hendrycks and Kevin Gimpel with
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the corresponding GitHub repo: https://github.com/hendrycks/GELUs
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"""
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import math
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import torch
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import torch.nn as nn
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def gelu_accurate(x):
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if not hasattr(gelu_accurate, "_a"):
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gelu_accurate._a = math.sqrt(2 / math.pi)
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return (
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0.5 * x * (1 + torch.tanh(gelu_accurate._a * (x + 0.044715 * torch.pow(x, 3))))
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)
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def gelu(x: torch.Tensor) -> torch.Tensor:
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return torch.nn.functional.gelu(x.float()).type_as(x)
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