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57 lines
1.7 KiB
57 lines
1.7 KiB
from typing import Callable, List, Optional, 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 Array2d, Array3d
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InT = TypeVar("InT", bound=Array3d)
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OutT = TypeVar("OutT", bound=Array2d)
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@registry.layers("with_reshape.v1")
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def with_reshape(layer: Model[OutT, OutT]) -> Model[InT, InT]:
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"""Reshape data on the way into and out from a layer."""
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return Model(
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f"with_reshape({layer.name})",
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forward,
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init=init,
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layers=[layer],
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dims={"nO": None, "nI": None},
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)
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def forward(model: Model[InT, InT], X: InT, is_train: bool) -> Tuple[InT, Callable]:
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layer = model.layers[0]
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initial_shape = X.shape
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final_shape = list(initial_shape[:-1]) + [layer.get_dim("nO")]
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nB = X.shape[0]
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nT = X.shape[1]
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X2d = model.ops.reshape(X, (-1, X.shape[2]))
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Y2d, Y2d_backprop = layer(X2d, is_train=is_train)
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Y = model.ops.reshape3(Y2d, *final_shape)
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def backprop(dY: InT) -> InT:
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reshaped = model.ops.reshape2(dY, nB * nT, -1)
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return Y2d_backprop(model.ops.reshape3(reshaped, *initial_shape))
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return cast(InT, Y), backprop
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def init(
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model: Model[InT, InT], X: Optional[Array3d] = None, Y: Optional[Array3d] = None
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) -> None:
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layer = model.layers[0]
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if X is None and Y is None:
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layer.initialize()
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X2d: Optional[Array2d] = None
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Y2d: Optional[Array2d] = None
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if X is not None:
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X2d = cast(Array2d, model.ops.reshape(X, (-1, X.shape[-1])))
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if Y is not None:
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Y2d = cast(Array2d, model.ops.reshape(Y, (-1, Y.shape[-1])))
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layer.initialize(X=X2d, Y=Y2d)
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if layer.has_dim("nI"):
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model.set_dim("nI", layer.get_dim("nI"))
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if layer.has_dim("nO"):
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model.set_dim("nO", layer.get_dim("nO"))
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