mirror of
https://github.com/explosion/spaCy.git
synced 2024-12-27 10:26:35 +03:00
717 lines
26 KiB
Cython
717 lines
26 KiB
Cython
from __future__ import unicode_literals
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cimport numpy as np
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from libc.math cimport sqrt
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import numpy
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from thinc.api import get_array_module
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import warnings
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from .doc cimport token_by_start, token_by_end, get_token_attr, _get_lca_matrix
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from ..structs cimport TokenC, LexemeC
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from ..typedefs cimport flags_t, attr_t, hash_t
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from ..attrs cimport attr_id_t
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from ..parts_of_speech cimport univ_pos_t
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from ..attrs cimport *
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from ..lexeme cimport Lexeme
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from ..symbols cimport dep
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from ..util import normalize_slice
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from ..errors import Errors, Warnings
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from .underscore import Underscore, get_ext_args
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cdef class Span:
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"""A slice from a Doc object.
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DOCS: https://nightly.spacy.io/api/span
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"""
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@classmethod
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def set_extension(cls, name, **kwargs):
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"""Define a custom attribute which becomes available as `Span._`.
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name (str): Name of the attribute to set.
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default: Optional default value of the attribute.
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getter (callable): Optional getter function.
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setter (callable): Optional setter function.
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method (callable): Optional method for method extension.
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force (bool): Force overwriting existing attribute.
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DOCS: https://nightly.spacy.io/api/span#set_extension
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USAGE: https://nightly.spacy.io/usage/processing-pipelines#custom-components-attributes
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"""
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if cls.has_extension(name) and not kwargs.get("force", False):
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raise ValueError(Errors.E090.format(name=name, obj="Span"))
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Underscore.span_extensions[name] = get_ext_args(**kwargs)
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@classmethod
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def get_extension(cls, name):
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"""Look up a previously registered extension by name.
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name (str): Name of the extension.
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RETURNS (tuple): A `(default, method, getter, setter)` tuple.
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DOCS: https://nightly.spacy.io/api/span#get_extension
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"""
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return Underscore.span_extensions.get(name)
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@classmethod
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def has_extension(cls, name):
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"""Check whether an extension has been registered.
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name (str): Name of the extension.
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RETURNS (bool): Whether the extension has been registered.
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DOCS: https://nightly.spacy.io/api/span#has_extension
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"""
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return name in Underscore.span_extensions
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@classmethod
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def remove_extension(cls, name):
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"""Remove a previously registered extension.
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name (str): Name of the extension.
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RETURNS (tuple): A `(default, method, getter, setter)` tuple of the
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removed extension.
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DOCS: https://nightly.spacy.io/api/span#remove_extension
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"""
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if not cls.has_extension(name):
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raise ValueError(Errors.E046.format(name=name))
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return Underscore.span_extensions.pop(name)
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def __cinit__(self, Doc doc, int start, int end, label=0, vector=None,
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vector_norm=None, kb_id=0):
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"""Create a `Span` object from the slice `doc[start : end]`.
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doc (Doc): The parent document.
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start (int): The index of the first token of the span.
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end (int): The index of the first token after the span.
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label (uint64): A label to attach to the Span, e.g. for named entities.
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kb_id (uint64): An identifier from a Knowledge Base to capture the meaning of a named entity.
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vector (ndarray[ndim=1, dtype='float32']): A meaning representation
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of the span.
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DOCS: https://nightly.spacy.io/api/span#init
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"""
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if not (0 <= start <= end <= len(doc)):
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raise IndexError(Errors.E035.format(start=start, end=end, length=len(doc)))
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self.doc = doc
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self.start = start
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self.start_char = self.doc[start].idx if start < self.doc.length else 0
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self.end = end
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if end >= 1:
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self.end_char = self.doc[end - 1].idx + len(self.doc[end - 1])
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else:
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self.end_char = 0
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if isinstance(label, str):
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label = doc.vocab.strings.add(label)
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if isinstance(kb_id, str):
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kb_id = doc.vocab.strings.add(kb_id)
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if label not in doc.vocab.strings:
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raise ValueError(Errors.E084.format(label=label))
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self.label = label
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self._vector = vector
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self._vector_norm = vector_norm
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self.kb_id = kb_id
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def __richcmp__(self, Span other, int op):
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if other is None:
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if op == 0 or op == 1 or op == 2:
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return False
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else:
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return True
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# <
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if op == 0:
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return self.start_char < other.start_char
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# <=
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elif op == 1:
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return self.start_char <= other.start_char
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# ==
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elif op == 2:
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return (self.doc, self.start_char, self.end_char, self.label, self.kb_id) == (other.doc, other.start_char, other.end_char, other.label, other.kb_id)
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# !=
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elif op == 3:
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return (self.doc, self.start_char, self.end_char, self.label, self.kb_id) != (other.doc, other.start_char, other.end_char, other.label, other.kb_id)
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# >
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elif op == 4:
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return self.start_char > other.start_char
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# >=
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elif op == 5:
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return self.start_char >= other.start_char
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def __hash__(self):
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return hash((self.doc, self.start_char, self.end_char, self.label, self.kb_id))
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def __len__(self):
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"""Get the number of tokens in the span.
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RETURNS (int): The number of tokens in the span.
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DOCS: https://nightly.spacy.io/api/span#len
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"""
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self._recalculate_indices()
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if self.end < self.start:
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return 0
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return self.end - self.start
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def __repr__(self):
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return self.text
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def __getitem__(self, object i):
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"""Get a `Token` or a `Span` object
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i (int or tuple): The index of the token within the span, or slice of
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the span to get.
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RETURNS (Token or Span): The token at `span[i]`.
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DOCS: https://nightly.spacy.io/api/span#getitem
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"""
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self._recalculate_indices()
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if isinstance(i, slice):
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start, end = normalize_slice(len(self), i.start, i.stop, i.step)
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return Span(self.doc, start + self.start, end + self.start)
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else:
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if i < 0:
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token_i = self.end + i
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else:
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token_i = self.start + i
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if self.start <= token_i < self.end:
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return self.doc[token_i]
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else:
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raise IndexError(Errors.E1002)
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def __iter__(self):
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"""Iterate over `Token` objects.
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YIELDS (Token): A `Token` object.
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DOCS: https://nightly.spacy.io/api/span#iter
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"""
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self._recalculate_indices()
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for i in range(self.start, self.end):
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yield self.doc[i]
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def __reduce__(self):
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raise NotImplementedError(Errors.E112)
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@property
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def _(self):
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"""Custom extension attributes registered via `set_extension`."""
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return Underscore(Underscore.span_extensions, self,
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start=self.start_char, end=self.end_char)
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def as_doc(self, *, bint copy_user_data=False):
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"""Create a `Doc` object with a copy of the `Span`'s data.
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copy_user_data (bool): Whether or not to copy the original doc's user data.
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RETURNS (Doc): The `Doc` copy of the span.
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DOCS: https://nightly.spacy.io/api/span#as_doc
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"""
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words = [t.text for t in self]
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spaces = [bool(t.whitespace_) for t in self]
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cdef Doc doc = Doc(self.doc.vocab, words=words, spaces=spaces)
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array_head = self.doc._get_array_attrs()
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array = self.doc.to_array(array_head)
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array = array[self.start : self.end]
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self._fix_dep_copy(array_head, array)
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doc.from_array(array_head, array)
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doc.noun_chunks_iterator = self.doc.noun_chunks_iterator
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doc.user_hooks = self.doc.user_hooks
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doc.user_span_hooks = self.doc.user_span_hooks
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doc.user_token_hooks = self.doc.user_token_hooks
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doc.vector = self.vector
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doc.vector_norm = self.vector_norm
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doc.tensor = self.doc.tensor[self.start : self.end]
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for key, value in self.doc.cats.items():
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if hasattr(key, "__len__") and len(key) == 3:
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cat_start, cat_end, cat_label = key
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if cat_start == self.start_char and cat_end == self.end_char:
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doc.cats[cat_label] = value
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if copy_user_data:
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doc.user_data = self.doc.user_data
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return doc
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def _fix_dep_copy(self, attrs, array):
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""" Rewire dependency links to make sure their heads fall into the span
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while still keeping the correct number of sentences. """
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cdef int length = len(array)
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cdef attr_t value
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cdef int i, head_col, ancestor_i
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old_to_new_root = dict()
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if HEAD in attrs:
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head_col = attrs.index(HEAD)
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for i in range(length):
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# if the HEAD refers to a token outside this span, find a more appropriate ancestor
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token = self[i]
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ancestor_i = token.head.i - self.start # span offset
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if ancestor_i not in range(length):
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if DEP in attrs:
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array[i, attrs.index(DEP)] = dep
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# try finding an ancestor within this span
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ancestors = token.ancestors
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for ancestor in ancestors:
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ancestor_i = ancestor.i - self.start
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if ancestor_i in range(length):
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array[i, head_col] = ancestor_i - i
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# if there is no appropriate ancestor, define a new artificial root
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value = array[i, head_col]
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if (i+value) not in range(length):
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new_root = old_to_new_root.get(ancestor_i, None)
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if new_root is not None:
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# take the same artificial root as a previous token from the same sentence
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array[i, head_col] = new_root - i
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else:
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# set this token as the new artificial root
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array[i, head_col] = 0
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old_to_new_root[ancestor_i] = i
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return array
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def get_lca_matrix(self):
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"""Calculates a matrix of Lowest Common Ancestors (LCA) for a given
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`Span`, where LCA[i, j] is the index of the lowest common ancestor among
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the tokens span[i] and span[j]. If they have no common ancestor within
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the span, LCA[i, j] will be -1.
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RETURNS (np.array[ndim=2, dtype=numpy.int32]): LCA matrix with shape
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(n, n), where n = len(self).
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DOCS: https://nightly.spacy.io/api/span#get_lca_matrix
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"""
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return numpy.asarray(_get_lca_matrix(self.doc, self.start, self.end))
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def similarity(self, other):
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"""Make a semantic similarity estimate. The default estimate is cosine
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similarity using an average of word vectors.
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other (object): The object to compare with. By default, accepts `Doc`,
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`Span`, `Token` and `Lexeme` objects.
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RETURNS (float): A scalar similarity score. Higher is more similar.
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DOCS: https://nightly.spacy.io/api/span#similarity
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"""
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if "similarity" in self.doc.user_span_hooks:
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return self.doc.user_span_hooks["similarity"](self, other)
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if len(self) == 1 and hasattr(other, "orth"):
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if self[0].orth == other.orth:
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return 1.0
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elif isinstance(other, (Doc, Span)) and len(self) == len(other):
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similar = True
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for i in range(len(self)):
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if self[i].orth != getattr(other[i], "orth", None):
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similar = False
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break
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if similar:
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return 1.0
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if self.vocab.vectors.n_keys == 0:
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warnings.warn(Warnings.W007.format(obj="Span"))
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if self.vector_norm == 0.0 or other.vector_norm == 0.0:
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warnings.warn(Warnings.W008.format(obj="Span"))
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return 0.0
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vector = self.vector
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xp = get_array_module(vector)
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return xp.dot(vector, other.vector) / (self.vector_norm * other.vector_norm)
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cpdef np.ndarray to_array(self, object py_attr_ids):
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"""Given a list of M attribute IDs, export the tokens to a numpy
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`ndarray` of shape `(N, M)`, where `N` is the length of the document.
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The values will be 32-bit integers.
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attr_ids (list[int]): A list of attribute ID ints.
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RETURNS (numpy.ndarray[long, ndim=2]): A feature matrix, with one row
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per word, and one column per attribute indicated in the input
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`attr_ids`.
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"""
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cdef int i, j
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cdef attr_id_t feature
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cdef np.ndarray[attr_t, ndim=2] output
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# Make an array from the attributes - otherwise our inner loop is Python
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# dict iteration
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cdef np.ndarray[attr_t, ndim=1] attr_ids = numpy.asarray(py_attr_ids, dtype=numpy.uint64)
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cdef int length = self.end - self.start
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output = numpy.ndarray(shape=(length, len(attr_ids)), dtype=numpy.uint64)
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for i in range(self.start, self.end):
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for j, feature in enumerate(attr_ids):
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output[i-self.start, j] = get_token_attr(&self.doc.c[i], feature)
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return output
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cpdef int _recalculate_indices(self) except -1:
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if self.end > self.doc.length \
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or self.doc.c[self.start].idx != self.start_char \
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or (self.doc.c[self.end-1].idx + self.doc.c[self.end-1].lex.length) != self.end_char:
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start = token_by_start(self.doc.c, self.doc.length, self.start_char)
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if self.start == -1:
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raise IndexError(Errors.E036.format(start=self.start_char))
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end = token_by_end(self.doc.c, self.doc.length, self.end_char)
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if end == -1:
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raise IndexError(Errors.E037.format(end=self.end_char))
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self.start = start
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self.end = end + 1
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@property
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def vocab(self):
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"""RETURNS (Vocab): The Span's Doc's vocab."""
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return self.doc.vocab
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@property
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def sent(self):
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"""RETURNS (Span): The sentence span that the span is a part of."""
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if "sent" in self.doc.user_span_hooks:
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return self.doc.user_span_hooks["sent"](self)
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# This should raise if not parsed / no custom sentence boundaries
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self.doc.sents
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# Use `sent_start` token attribute to find sentence boundaries
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cdef int n = 0
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if self.doc.has_annotation("SENT_START"):
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# Find start of the sentence
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start = self.start
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while self.doc.c[start].sent_start != 1 and start > 0:
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start += -1
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# Find end of the sentence
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end = self.end
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n = 0
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while end < self.doc.length and self.doc.c[end].sent_start != 1:
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end += 1
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n += 1
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if n >= self.doc.length:
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break
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return self.doc[start:end]
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@property
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def ents(self):
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"""The named entities in the span. Returns a tuple of named entity
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`Span` objects, if the entity recognizer has been applied.
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RETURNS (tuple): Entities in the span, one `Span` per entity.
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DOCS: https://nightly.spacy.io/api/span#ents
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"""
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ents = []
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for ent in self.doc.ents:
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if ent.start >= self.start and ent.end <= self.end:
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ents.append(ent)
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return ents
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@property
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def has_vector(self):
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"""A boolean value indicating whether a word vector is associated with
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the object.
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RETURNS (bool): Whether a word vector is associated with the object.
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DOCS: https://nightly.spacy.io/api/span#has_vector
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"""
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if "has_vector" in self.doc.user_span_hooks:
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return self.doc.user_span_hooks["has_vector"](self)
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elif self.vocab.vectors.data.size > 0:
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return any(token.has_vector for token in self)
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elif self.doc.tensor.size > 0:
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return True
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else:
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return False
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@property
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def vector(self):
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"""A real-valued meaning representation. Defaults to an average of the
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token vectors.
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RETURNS (numpy.ndarray[ndim=1, dtype='float32']): A 1D numpy array
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representing the span's semantics.
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DOCS: https://nightly.spacy.io/api/span#vector
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"""
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if "vector" in self.doc.user_span_hooks:
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return self.doc.user_span_hooks["vector"](self)
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if self._vector is None:
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self._vector = sum(t.vector for t in self) / len(self)
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return self._vector
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@property
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def vector_norm(self):
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"""The L2 norm of the span's vector representation.
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RETURNS (float): The L2 norm of the vector representation.
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DOCS: https://nightly.spacy.io/api/span#vector_norm
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"""
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if "vector_norm" in self.doc.user_span_hooks:
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return self.doc.user_span_hooks["vector"](self)
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vector = self.vector
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xp = get_array_module(vector)
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if self._vector_norm is None:
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total = (vector*vector).sum()
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self._vector_norm = xp.sqrt(total) if total != 0. else 0.
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return self._vector_norm
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@property
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def tensor(self):
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"""The span's slice of the doc's tensor.
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RETURNS (ndarray[ndim=2, dtype='float32']): A 2D numpy or cupy array
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representing the span's semantics.
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"""
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if self.doc.tensor is None:
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return None
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return self.doc.tensor[self.start : self.end]
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@property
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def sentiment(self):
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"""RETURNS (float): A scalar value indicating the positivity or
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negativity of the span.
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"""
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if "sentiment" in self.doc.user_span_hooks:
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return self.doc.user_span_hooks["sentiment"](self)
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else:
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return sum([token.sentiment for token in self]) / len(self)
|
||
|
||
@property
|
||
def text(self):
|
||
"""RETURNS (str): The original verbatim text of the span."""
|
||
text = self.text_with_ws
|
||
if self[-1].whitespace_:
|
||
text = text[:-1]
|
||
return text
|
||
|
||
@property
|
||
def text_with_ws(self):
|
||
"""The text content of the span with a trailing whitespace character if
|
||
the last token has one.
|
||
|
||
RETURNS (str): The text content of the span (with trailing
|
||
whitespace).
|
||
"""
|
||
return "".join([t.text_with_ws for t in self])
|
||
|
||
@property
|
||
def noun_chunks(self):
|
||
"""Yields base noun-phrase `Span` objects, if the document has been
|
||
syntactically parsed. A base noun phrase, or "NP chunk", is a noun
|
||
phrase that does not permit other NPs to be nested within it – so no
|
||
NP-level coordination, no prepositional phrases, and no relative
|
||
clauses.
|
||
|
||
YIELDS (Span): Base noun-phrase `Span` objects.
|
||
|
||
DOCS: https://nightly.spacy.io/api/span#noun_chunks
|
||
"""
|
||
# Accumulate the result before beginning to iterate over it. This
|
||
# prevents the tokenisation from being changed out from under us
|
||
# during the iteration. The tricky thing here is that Span accepts
|
||
# its tokenisation changing, so it's okay once we have the Span
|
||
# objects. See Issue #375
|
||
spans = []
|
||
cdef attr_t label
|
||
if self.doc.noun_chunks_iterator is not None:
|
||
for start, end, label in self.doc.noun_chunks_iterator(self):
|
||
spans.append(Span(self.doc, start, end, label=label))
|
||
for span in spans:
|
||
yield span
|
||
|
||
@property
|
||
def root(self):
|
||
"""The token with the shortest path to the root of the
|
||
sentence (or the root itself). If multiple tokens are equally
|
||
high in the tree, the first token is taken.
|
||
|
||
RETURNS (Token): The root token.
|
||
|
||
DOCS: https://nightly.spacy.io/api/span#root
|
||
"""
|
||
self._recalculate_indices()
|
||
if "root" in self.doc.user_span_hooks:
|
||
return self.doc.user_span_hooks["root"](self)
|
||
# This should probably be called 'head', and the other one called
|
||
# 'gov'. But we went with 'head' elsewhere, and now we're stuck =/
|
||
cdef int i
|
||
# First, we scan through the Span, and check whether there's a word
|
||
# with head==0, i.e. a sentence root. If so, we can return it. The
|
||
# longer the span, the more likely it contains a sentence root, and
|
||
# in this case we return in linear time.
|
||
for i in range(self.start, self.end):
|
||
if self.doc.c[i].head == 0:
|
||
return self.doc[i]
|
||
# If we don't have a sentence root, we do something that's not so
|
||
# algorithmically clever, but I think should be quite fast,
|
||
# especially for short spans.
|
||
# For each word, we count the path length, and arg min this measure.
|
||
# We could use better tree logic to save steps here...But I
|
||
# think this should be okay.
|
||
cdef int current_best = self.doc.length
|
||
cdef int root = -1
|
||
for i in range(self.start, self.end):
|
||
if self.start <= (i+self.doc.c[i].head) < self.end:
|
||
continue
|
||
words_to_root = _count_words_to_root(&self.doc.c[i], self.doc.length)
|
||
if words_to_root < current_best:
|
||
current_best = words_to_root
|
||
root = i
|
||
if root == -1:
|
||
return self.doc[self.start]
|
||
else:
|
||
return self.doc[root]
|
||
|
||
def char_span(self, int start_idx, int end_idx, label=0, kb_id=0, vector=None):
|
||
"""Create a `Span` object from the slice `span.text[start : end]`.
|
||
|
||
start (int): The index of the first character of the span.
|
||
end (int): The index of the first character after the span.
|
||
label (uint64 or string): A label to attach to the Span, e.g. for
|
||
named entities.
|
||
kb_id (uint64 or string): An ID from a KB to capture the meaning of a named entity.
|
||
vector (ndarray[ndim=1, dtype='float32']): A meaning representation of
|
||
the span.
|
||
RETURNS (Span): The newly constructed object.
|
||
"""
|
||
start_idx += self.start_char
|
||
end_idx += self.start_char
|
||
return self.doc.char_span(start_idx, end_idx)
|
||
|
||
@property
|
||
def conjuncts(self):
|
||
"""Tokens that are conjoined to the span's root.
|
||
|
||
RETURNS (tuple): A tuple of Token objects.
|
||
|
||
DOCS: https://nightly.spacy.io/api/span#lefts
|
||
"""
|
||
return self.root.conjuncts
|
||
|
||
@property
|
||
def lefts(self):
|
||
"""Tokens that are to the left of the span, whose head is within the
|
||
`Span`.
|
||
|
||
YIELDS (Token):A left-child of a token of the span.
|
||
|
||
DOCS: https://nightly.spacy.io/api/span#lefts
|
||
"""
|
||
for token in reversed(self): # Reverse, so we get tokens in order
|
||
for left in token.lefts:
|
||
if left.i < self.start:
|
||
yield left
|
||
|
||
@property
|
||
def rights(self):
|
||
"""Tokens that are to the right of the Span, whose head is within the
|
||
`Span`.
|
||
|
||
YIELDS (Token): A right-child of a token of the span.
|
||
|
||
DOCS: https://nightly.spacy.io/api/span#rights
|
||
"""
|
||
for token in self:
|
||
for right in token.rights:
|
||
if right.i >= self.end:
|
||
yield right
|
||
|
||
@property
|
||
def n_lefts(self):
|
||
"""The number of tokens that are to the left of the span, whose
|
||
heads are within the span.
|
||
|
||
RETURNS (int): The number of leftward immediate children of the
|
||
span, in the syntactic dependency parse.
|
||
|
||
DOCS: https://nightly.spacy.io/api/span#n_lefts
|
||
"""
|
||
return len(list(self.lefts))
|
||
|
||
@property
|
||
def n_rights(self):
|
||
"""The number of tokens that are to the right of the span, whose
|
||
heads are within the span.
|
||
|
||
RETURNS (int): The number of rightward immediate children of the
|
||
span, in the syntactic dependency parse.
|
||
|
||
DOCS: https://nightly.spacy.io/api/span#n_rights
|
||
"""
|
||
return len(list(self.rights))
|
||
|
||
@property
|
||
def subtree(self):
|
||
"""Tokens within the span and tokens which descend from them.
|
||
|
||
YIELDS (Token): A token within the span, or a descendant from it.
|
||
|
||
DOCS: https://nightly.spacy.io/api/span#subtree
|
||
"""
|
||
for word in self.lefts:
|
||
yield from word.subtree
|
||
yield from self
|
||
for word in self.rights:
|
||
yield from word.subtree
|
||
|
||
property ent_id:
|
||
"""RETURNS (uint64): The entity ID."""
|
||
def __get__(self):
|
||
return self.root.ent_id
|
||
|
||
def __set__(self, hash_t key):
|
||
raise NotImplementedError(Errors.E200.format(attr="ent_id"))
|
||
|
||
property ent_id_:
|
||
"""RETURNS (str): The (string) entity ID."""
|
||
def __get__(self):
|
||
return self.root.ent_id_
|
||
|
||
def __set__(self, hash_t key):
|
||
raise NotImplementedError(Errors.E200.format(attr="ent_id_"))
|
||
|
||
@property
|
||
def orth_(self):
|
||
"""Verbatim text content (identical to `Span.text`). Exists mostly for
|
||
consistency with other attributes.
|
||
|
||
RETURNS (str): The span's text."""
|
||
return self.text
|
||
|
||
@property
|
||
def lemma_(self):
|
||
"""RETURNS (str): The span's lemma."""
|
||
return " ".join([t.lemma_ for t in self]).strip()
|
||
|
||
property label_:
|
||
"""RETURNS (str): The span's label."""
|
||
def __get__(self):
|
||
return self.doc.vocab.strings[self.label]
|
||
|
||
def __set__(self, unicode label_):
|
||
if not label_:
|
||
label_ = ''
|
||
raise NotImplementedError(Errors.E129.format(start=self.start, end=self.end, label=label_))
|
||
|
||
property kb_id_:
|
||
"""RETURNS (str): The named entity's KB ID."""
|
||
def __get__(self):
|
||
return self.doc.vocab.strings[self.kb_id]
|
||
|
||
def __set__(self, unicode kb_id_):
|
||
if not kb_id_:
|
||
kb_id_ = ''
|
||
current_label = self.label_
|
||
if not current_label:
|
||
current_label = ''
|
||
raise NotImplementedError(Errors.E131.format(start=self.start, end=self.end,
|
||
label=current_label, kb_id=kb_id_))
|
||
|
||
|
||
cdef int _count_words_to_root(const TokenC* token, int sent_length) except -1:
|
||
# Don't allow spaces to be the root, if there are
|
||
# better candidates
|
||
if Lexeme.c_check_flag(token.lex, IS_SPACE) and token.l_kids == 0 and token.r_kids == 0:
|
||
return sent_length-1
|
||
if Lexeme.c_check_flag(token.lex, IS_PUNCT) and token.l_kids == 0 and token.r_kids == 0:
|
||
return sent_length-1
|
||
cdef int n = 0
|
||
while token.head != 0:
|
||
token += token.head
|
||
n += 1
|
||
if n >= sent_length:
|
||
raise RuntimeError(Errors.E039)
|
||
return n
|