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101 lines
3.3 KiB
Python
101 lines
3.3 KiB
Python
from typing import List, Tuple, Callable, Optional, cast
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from thinc.initializers import glorot_uniform_init
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from thinc.util import partial
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from thinc.types import Ragged, Floats2d, Floats1d
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from thinc.api import Model, Ops, registry
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from ..tokens import Doc
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@registry.layers("spacy.StaticVectors.v1")
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def StaticVectors(
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nO: Optional[int] = None,
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nM: Optional[int] = None,
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*,
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dropout: Optional[float] = None,
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init_W: Callable = glorot_uniform_init,
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key_attr: str = "ORTH"
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) -> Model[List[Doc], Ragged]:
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"""Embed Doc objects with their vocab's vectors table, applying a learned
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linear projection to control the dimensionality. If a dropout rate is
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specified, the dropout is applied per dimension over the whole batch.
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"""
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return Model(
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"static_vectors",
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forward,
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init=partial(init, init_W),
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params={"W": None},
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attrs={"key_attr": key_attr, "dropout_rate": dropout},
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dims={"nO": nO, "nM": nM},
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)
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def forward(
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model: Model[List[Doc], Ragged], docs: List[Doc], is_train: bool
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) -> Tuple[Ragged, Callable]:
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if not len(docs):
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return _handle_empty(model.ops, model.get_dim("nO"))
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key_attr = model.attrs["key_attr"]
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W = cast(Floats2d, model.ops.as_contig(model.get_param("W")))
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V = cast(Floats2d, docs[0].vocab.vectors.data)
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mask = _get_drop_mask(model.ops, W.shape[0], model.attrs.get("dropout_rate"))
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rows = model.ops.flatten(
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[doc.vocab.vectors.find(keys=doc.to_array(key_attr)) for doc in docs]
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)
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output = Ragged(
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model.ops.gemm(model.ops.as_contig(V[rows]), W, trans2=True),
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model.ops.asarray([len(doc) for doc in docs], dtype="i"),
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)
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if mask is not None:
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output.data *= mask
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def backprop(d_output: Ragged) -> List[Doc]:
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if mask is not None:
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d_output.data *= mask
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model.inc_grad(
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"W",
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model.ops.gemm(d_output.data, model.ops.as_contig(V[rows]), trans1=True),
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)
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return []
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return output, backprop
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def init(
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init_W: Callable,
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model: Model[List[Doc], Ragged],
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X: Optional[List[Doc]] = None,
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Y: Optional[Ragged] = None,
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) -> Model[List[Doc], Ragged]:
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nM = model.get_dim("nM") if model.has_dim("nM") else None
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nO = model.get_dim("nO") if model.has_dim("nO") else None
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if X is not None and len(X):
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nM = X[0].vocab.vectors.data.shape[1]
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if Y is not None:
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nO = Y.data.shape[1]
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if nM is None:
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raise ValueError(
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"Cannot initialize StaticVectors layer: nM dimension unset. "
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"This dimension refers to the width of the vectors table."
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)
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if nO is None:
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raise ValueError(
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"Cannot initialize StaticVectors layer: nO dimension unset. "
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"This dimension refers to the output width, after the linear "
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"projection has been applied."
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)
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model.set_dim("nM", nM)
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model.set_dim("nO", nO)
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model.set_param("W", init_W(model.ops, (nO, nM)))
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return model
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def _handle_empty(ops: Ops, nO: int):
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return Ragged(ops.alloc2f(0, nO), ops.alloc1i(0)), lambda d_ragged: []
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def _get_drop_mask(ops: Ops, nO: int, rate: Optional[float]) -> Optional[Floats1d]:
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return ops.get_dropout_mask((nO,), rate) if rate is not None else None
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