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from typing import Callable, Tuple, TypeVar, cast
from ..config import registry
from ..model import Model
from ..types import List2d, Padded
InT = TypeVar("InT", bound=List2d)
OutT = Padded
@registry.layers("list2padded.v1")
def list2padded() -> Model[InT, OutT]:
"""Create a layer to convert a list of array inputs into Padded."""
return Model(f"list2padded", forward)
def forward(model: Model[InT, OutT], Xs: InT, is_train: bool) -> Tuple[OutT, Callable]:
Yp = model.ops.list2padded(Xs)
def backprop(dYp: OutT) -> InT:
return cast(InT, model.ops.padded2list(dYp))
return Yp, backprop
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