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"""Miscellaneous neural network utility functionality."""
from typing import Type
from torch import nn
def activation_function(activation: str) -> Type[nn.Module]:
"""Returns the callable activation function."""
activation_fns = nn.ModuleDict(
[
["elu", nn.ELU(inplace=True)],
["gelu", nn.GELU()],
["glu", nn.GLU()],
["leaky_relu", nn.LeakyReLU(negative_slope=1.0e-2, inplace=True)],
["none", nn.Identity()],
["relu", nn.ReLU(inplace=True)],
["selu", nn.SELU(inplace=True)],
["mish", nn.Mish(inplace=True)],
]
)
return activation_fns[activation.lower()]
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