spaCy/spacy/ml/featureextractor.py

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from typing import List, Union, Callable, Tuple
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from thinc.types import Ints2d
from thinc.api import Model, registry
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from ..tokens import Doc
@registry.layers("spacy.FeatureExtractor.v1")
def FeatureExtractor(columns: List[Union[int, str]]) -> Model[List[Doc], List[Ints2d]]:
return Model("extract_features", forward, attrs={"columns": columns})
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def forward(
model: Model[List[Doc], List[Ints2d]], docs, is_train: bool
) -> Tuple[List[Ints2d], Callable]:
columns = model.attrs["columns"]
features: List[Ints2d] = []
for doc in docs:
if hasattr(doc, "to_array"):
attrs = doc.to_array(columns)
else:
attrs = doc.doc.to_array(columns)[doc.start : doc.end]
if attrs.ndim == 1:
attrs = attrs.reshape((attrs.shape[0], 1))
features.append(model.ops.asarray2i(attrs, dtype="uint64"))
backprop: Callable[[List[Ints2d]], List] = lambda d_features: []
return features, backprop