25 lines
652 B
Python
25 lines
652 B
Python
from typing import Callable, Tuple, TypeVar, cast
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from ..config import registry
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from ..model import Model
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from ..types import FloatsXdT
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@registry.layers("sigmoid_activation.v1")
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def sigmoid_activation() -> Model[FloatsXdT, FloatsXdT]:
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return Model("sigmoid_activation", forward)
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def forward(
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model: Model[FloatsXdT, FloatsXdT], X: FloatsXdT, is_train: bool
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) -> Tuple[FloatsXdT, Callable]:
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Y = model.ops.sigmoid(X, inplace=False)
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def backprop(dY: FloatsXdT) -> FloatsXdT:
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return cast(
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FloatsXdT,
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dY * model.ops.dsigmoid(Y, inplace=False), # type:ignore[operator]
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)
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return Y, backprop
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