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31 lines
807 B
Python
31 lines
807 B
Python
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from typing import List
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import numpy
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from thinc.types import Ragged
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from dataclasses import dataclass
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import tokenizations
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@dataclass
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class Alignment:
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x2y: Ragged
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y2x: Ragged
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@classmethod
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def from_indices(cls, x2y: List[List[int]], y2x: List[List[int]]) -> "Alignment":
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x2y = _make_ragged(x2y)
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y2x = _make_ragged(y2x)
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return Alignment(x2y=x2y, y2x=y2x)
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@classmethod
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def from_strings(cls, A: List[str], B: List[str]) -> "Alignment":
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x2y, y2x = tokenizations.get_alignments(A, B)
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return Alignment.from_indices(x2y=x2y, y2x=y2x)
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def _make_ragged(indices):
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lengths = numpy.array([len(x) for x in indices], dtype="i")
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flat = []
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for x in indices:
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flat.extend(x)
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return Ragged(numpy.array(flat, dtype="i"), lengths)
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