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spaCy/spacy/tokens/token.pyx
Matthew Honnibal 01e59e4e6e * Add Token.sent_start property, re Issue #235
2017-05-23 18:41:11 +02:00

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# cython: infer_types=True
# coding: utf8
from __future__ import unicode_literals
from libc.string cimport memcpy
from cpython.mem cimport PyMem_Malloc, PyMem_Free
# Compiler crashes on memory view coercion without this. Should report bug.
from cython.view cimport array as cvarray
cimport numpy as np
np.import_array()
import numpy
from ..typedefs cimport hash_t
from ..lexeme cimport Lexeme
from .. import parts_of_speech
from ..attrs cimport IS_ALPHA, IS_ASCII, IS_DIGIT, IS_LOWER, IS_PUNCT, IS_SPACE
from ..attrs cimport IS_BRACKET, IS_QUOTE, IS_LEFT_PUNCT, IS_RIGHT_PUNCT, IS_OOV
from ..attrs cimport IS_TITLE, IS_UPPER, LIKE_URL, LIKE_NUM, LIKE_EMAIL, IS_STOP
from ..attrs cimport ID, ORTH, NORM, LOWER, SHAPE, PREFIX, SUFFIX, LENGTH, CLUSTER
from ..attrs cimport LEMMA, POS, TAG, DEP
from ..compat import is_config
from .. import about
cdef class Token:
"""An individual token – i.e. a word, punctuation symbol, whitespace, etc."""
def __cinit__(self, Vocab vocab, Doc doc, int offset):
"""Construct a `Token` object.
vocab (Vocab): A storage container for lexical types.
doc (Doc): The parent document.
offset (int): The index of the token within the document.
"""
self.vocab = vocab
self.doc = doc
self.c = &self.doc.c[offset]
self.i = offset
def __hash__(self):
return hash((self.doc, self.i))
def __len__(self):
"""The number of unicode characters in the token, i.e. `token.text`.
RETURNS (int): The number of unicode characters in the token.
"""
return self.c.lex.length
def __unicode__(self):
return self.text
def __bytes__(self):
return self.text.encode('utf8')
def __str__(self):
if is_config(python3=True):
return self.__unicode__()
return self.__bytes__()
def __repr__(self):
return self.__str__()
def __richcmp__(self, Token other, int op):
# http://cython.readthedocs.io/en/latest/src/userguide/special_methods.html
my = self.idx
their = other.idx if other is not None else None
if op == 0:
return my < their
elif op == 2:
return my == their
elif op == 4:
return my > their
elif op == 1:
return my <= their
elif op == 3:
return my != their
elif op == 5:
return my >= their
else:
raise ValueError(op)
cpdef bint check_flag(self, attr_id_t flag_id) except -1:
"""Check the value of a boolean flag.
flag_id (int): The ID of the flag attribute.
RETURNS (bool): Whether the flag is set.
EXAMPLE:
>>> from spacy.attrs import IS_TITLE
>>> doc = nlp(u'Give it back! He pleaded.')
>>> token = doc[0]
>>> token.check_flag(IS_TITLE)
True
"""
return Lexeme.c_check_flag(self.c.lex, flag_id)
def nbor(self, int i=1):
"""Get a neighboring token.
i (int): The relative position of the token to get. Defaults to 1.
RETURNS (Token): The token at position `self.doc[self.i+i]`.
"""
return self.doc[self.i+i]
def similarity(self, other):
"""Make a semantic similarity estimate. The default estimate is cosine
similarity using an average of word vectors.
other (object): The object to compare with. By default, accepts `Doc`,
`Span`, `Token` and `Lexeme` objects.
RETURNS (float): A scalar similarity score. Higher is more similar.
"""
if 'similarity' in self.doc.user_token_hooks:
return self.doc.user_token_hooks['similarity'](self)
if self.vector_norm == 0 or other.vector_norm == 0:
return 0.0
return numpy.dot(self.vector, other.vector) / (self.vector_norm * other.vector_norm)
property lex_id:
"""ID of the token's lexical type.
RETURNS (int): ID of the token's lexical type."""
def __get__(self):
return self.c.lex.id
property rank:
# TODO: add docstring
def __get__(self):
return self.c.lex.id
property string:
def __get__(self):
return self.text_with_ws
property text:
"""A unicode representation of the token text.
RETURNS (unicode): The original verbatim text of the token.
"""
def __get__(self):
return self.orth_
property text_with_ws:
"""The text content of the token with a trailing whitespace character if
it has one.
RETURNS (unicode): The text content of the span (with trailing whitespace).
"""
def __get__(self):
cdef unicode orth = self.vocab.strings[self.c.lex.orth]
if self.c.spacy:
return orth + u' '
else:
return orth
property prob:
def __get__(self):
return self.c.lex.prob
property sentiment:
def __get__(self):
if 'sentiment' in self.doc.user_token_hooks:
return self.doc.user_token_hooks['sentiment'](self)
return self.c.lex.sentiment
property lang:
def __get__(self):
return self.c.lex.lang
property idx:
def __get__(self):
return self.c.idx
property cluster:
def __get__(self):
return self.c.lex.cluster
property orth:
def __get__(self):
return self.c.lex.orth
property lower:
def __get__(self):
return self.c.lex.lower
property norm:
def __get__(self):
return self.c.lex.norm
property shape:
def __get__(self):
return self.c.lex.shape
property prefix:
def __get__(self):
return self.c.lex.prefix
property suffix:
def __get__(self):
return self.c.lex.suffix
property lemma:
"""Base form of the word, with no inflectional suffixes.
RETURNS (int): Token lemma.
"""
def __get__(self):
return self.c.lemma
def __set__(self, int lemma):
self.c.lemma = lemma
property pos:
def __get__(self):
return self.c.pos
property tag:
def __get__(self):
return self.c.tag
def __set__(self, int tag):
self.vocab.morphology.assign_tag(self.c, tag)
property dep:
def __get__(self):
return self.c.dep
def __set__(self, int label):
self.c.dep = label
property has_vector:
"""A boolean value indicating whether a word vector is associated with
the object.
RETURNS (bool): Whether a word vector is associated with the object.
"""
def __get__(self):
if 'has_vector' in self.doc.user_token_hooks:
return self.doc.user_token_hooks['has_vector'](self)
cdef int i
for i in range(self.vocab.vectors_length):
if self.c.lex.vector[i] != 0:
return True
else:
return False
property vector:
"""A real-valued meaning representation.
RETURNS (numpy.ndarray[ndim=1, dtype='float32']): A 1D numpy array
representing the token's semantics.
"""
def __get__(self):
if 'vector' in self.doc.user_token_hooks:
return self.doc.user_token_hooks['vector'](self)
cdef int length = self.vocab.vectors_length
if length == 0:
raise ValueError(
"Word vectors set to length 0. This may be because you "
"don't have a model installed or loaded, or because your "
"model doesn't include word vectors. For more info, see "
"the documentation: \n%s\n" % about.__docs_models__
)
vector_view = <float[:length,]>self.c.lex.vector
return numpy.asarray(vector_view)
property vector_norm:
"""The L2 norm of the token's vector representation.
RETURNS (float): The L2 norm of the vector representation.
"""
def __get__(self):
if 'vector_norm' in self.doc.user_token_hooks:
return self.doc.user_token_hooks['vector_norm'](self)
return self.c.lex.l2_norm
property n_lefts:
def __get__(self):
return self.c.l_kids
property n_rights:
def __get__(self):
return self.c.r_kids
property sent_start:
def __get__(self):
return self.c.sent_start
def __set__(self, bint value):
if self.doc.is_parsed:
raise ValueError(
'Refusing to write to token.sent_start if its document is parsed, '
'because this may cause inconsistent state. '
'See https://github.com/spacy-io/spaCy/issues/235 for workarounds.')
self.c.sent_start = value
property lefts:
def __get__(self):
"""
The leftward immediate children of the word, in the syntactic
dependency parse.
"""
cdef int nr_iter = 0
cdef const TokenC* ptr = self.c - (self.i - self.c.l_edge)
while ptr < self.c:
if ptr + ptr.head == self.c:
yield self.doc[ptr - (self.c - self.i)]
ptr += 1
nr_iter += 1
# This is ugly, but it's a way to guard out infinite loops
if nr_iter >= 10000000:
raise RuntimeError(
"Possibly infinite loop encountered while looking for token.lefts")
property rights:
def __get__(self):
"""
The rightward immediate children of the word, in the syntactic
dependency parse.
"""
cdef const TokenC* ptr = self.c + (self.c.r_edge - self.i)
tokens = []
cdef int nr_iter = 0
while ptr > self.c:
if ptr + ptr.head == self.c:
tokens.append(self.doc[ptr - (self.c - self.i)])
ptr -= 1
nr_iter += 1
if nr_iter >= 10000000:
raise RuntimeError(
"Possibly infinite loop encountered while looking for token.rights")
tokens.reverse()
for t in tokens:
yield t
property children:
"""
A sequence of the token's immediate syntactic children.
Yields: Token A child token such that child.head==self
"""
def __get__(self):
yield from self.lefts
yield from self.rights
property subtree:
"""
A sequence of all the token's syntactic descendents.
Yields: Token A descendent token such that self.is_ancestor(descendent)
"""
def __get__(self):
for word in self.lefts:
yield from word.subtree
yield self
for word in self.rights:
yield from word.subtree
property left_edge:
"""The leftmost token of this token's syntactic descendents.
RETURNS (Token): The first token such that `self.is_ancestor(token)`.
"""
def __get__(self):
return self.doc[self.c.l_edge]
property right_edge:
"""The rightmost token of this token's syntactic descendents.
RETURNS (Token): The last token such that `self.is_ancestor(token)`.
"""
def __get__(self):
return self.doc[self.c.r_edge]
property ancestors:
"""A sequence of this token's syntactic ancestors.
YIELDS (Token): A sequence of ancestor tokens such that
`ancestor.is_ancestor(self)`.
"""
def __get__(self):
cdef const TokenC* head_ptr = self.c
# guard against infinite loop, no token can have
# more ancestors than tokens in the tree
cdef int i = 0
while head_ptr.head != 0 and i < self.doc.length:
head_ptr += head_ptr.head
yield self.doc[head_ptr - (self.c - self.i)]
i += 1
def is_ancestor(self, descendant):
"""Check whether this token is a parent, grandparent, etc. of another
in the dependency tree.
descendant (Token): Another token.
RETURNS (bool): Whether this token is the ancestor of the descendant.
"""
if self.doc is not descendant.doc:
return False
return any( ancestor.i == self.i for ancestor in descendant.ancestors )
property head:
"""The syntactic parent, or "governor", of this token.
RETURNS (Token): The token head.
"""
def __get__(self):
"""The token predicted by the parser to be the head of the current
token.
"""
return self.doc[self.i + self.c.head]
def __set__(self, Token new_head):
# this function sets the head of self to new_head
# and updates the counters for left/right dependents
# and left/right corner for the new and the old head
# do nothing if old head is new head
if self.i + self.c.head == new_head.i:
return
cdef Token old_head = self.head
cdef int rel_newhead_i = new_head.i - self.i
# is the new head a descendant of the old head
cdef bint is_desc = old_head.is_ancestor(new_head)
cdef int new_edge
cdef Token anc, child
# update number of deps of old head
if self.c.head > 0: # left dependent
old_head.c.l_kids -= 1
if self.c.l_edge == old_head.c.l_edge:
# the token dominates the left edge so the left edge of the head
# may change when the token is reattached
# it may not change if the new head is a descendant of the current head
new_edge = self.c.l_edge
# the new l_edge is the left-most l_edge on any of the other dependents
# where the l_edge is left of the head, otherwise it is the head
if not is_desc:
new_edge = old_head.i
for child in old_head.children:
if child == self:
continue
if child.c.l_edge < new_edge:
new_edge = child.c.l_edge
old_head.c.l_edge = new_edge
# walk up the tree from old_head and assign new l_edge to ancestors
# until an ancestor already has an l_edge that's further left
for anc in old_head.ancestors:
if anc.c.l_edge <= new_edge:
break
anc.c.l_edge = new_edge
elif self.c.head < 0: # right dependent
old_head.c.r_kids -= 1
# do the same thing as for l_edge
if self.c.r_edge == old_head.c.r_edge:
new_edge = self.c.r_edge
if not is_desc:
new_edge = old_head.i
for child in old_head.children:
if child == self:
continue
if child.c.r_edge > new_edge:
new_edge = child.c.r_edge
old_head.c.r_edge = new_edge
for anc in old_head.ancestors:
if anc.c.r_edge >= new_edge:
break
anc.c.r_edge = new_edge
# update number of deps of new head
if rel_newhead_i > 0: # left dependent
new_head.c.l_kids += 1
# walk up the tree from new head and set l_edge to self.l_edge
# until you hit a token with an l_edge further to the left
if self.c.l_edge < new_head.c.l_edge:
new_head.c.l_edge = self.c.l_edge
for anc in new_head.ancestors:
if anc.c.l_edge <= self.c.l_edge:
break
anc.c.l_edge = self.c.l_edge
elif rel_newhead_i < 0: # right dependent
new_head.c.r_kids += 1
# do the same as for l_edge
if self.c.r_edge > new_head.c.r_edge:
new_head.c.r_edge = self.c.r_edge
for anc in new_head.ancestors:
if anc.c.r_edge >= self.c.r_edge:
break
anc.c.r_edge = self.c.r_edge
# set new head
self.c.head = rel_newhead_i
property conjuncts:
"""A sequence of coordinated tokens, including the token itself.
YIELDS (Token): A coordinated token.
"""
def __get__(self):
"""Get a list of conjoined words."""
cdef Token word
if 'conjuncts' in self.doc.user_token_hooks:
yield from self.doc.user_token_hooks['conjuncts'](self)
else:
if self.dep_ != 'conj':
for word in self.rights:
if word.dep_ == 'conj':
yield word
yield from word.conjuncts
property ent_type:
"""Named entity type.
RETURNS (int): Named entity type.
"""
def __get__(self):
return self.c.ent_type
property ent_iob:
"""IOB code of named entity tag. `1="I", 2="O", 3="B"`. 0 means no tag
is assigned.
RETURNS (int): IOB code of named entity tag.
"""
def __get__(self):
return self.c.ent_iob
property ent_type_:
"""Named entity type.
RETURNS (unicode): Named entity type.
"""
def __get__(self):
return self.vocab.strings[self.c.ent_type]
property ent_iob_:
"""IOB code of named entity tag. "B" means the token begins an entity,
"I" means it is inside an entity, "O" means it is outside an entity, and
"" means no entity tag is set.
RETURNS (unicode): IOB code of named entity tag.
"""
def __get__(self):
iob_strings = ('', 'I', 'O', 'B')
return iob_strings[self.c.ent_iob]
property ent_id:
"""ID of the entity the token is an instance of, if any. Usually
assigned by patterns in the Matcher.
RETURNS (int): ID of the entity.
"""
def __get__(self):
return self.c.ent_id
def __set__(self, hash_t key):
self.c.ent_id = key
property ent_id_:
"""ID of the entity the token is an instance of, if any. Usually
assigned by patterns in the Matcher.
RETURNS (unicode): ID of the entity.
"""
def __get__(self):
return self.vocab.strings[self.c.ent_id]
def __set__(self, name):
self.c.ent_id = self.vocab.strings[name]
property whitespace_:
def __get__(self):
return ' ' if self.c.spacy else ''
property orth_:
def __get__(self):
return self.vocab.strings[self.c.lex.orth]
property lower_:
def __get__(self):
return self.vocab.strings[self.c.lex.lower]
property norm_:
def __get__(self):
return self.vocab.strings[self.c.lex.norm]
property shape_:
def __get__(self):
return self.vocab.strings[self.c.lex.shape]
property prefix_:
def __get__(self):
return self.vocab.strings[self.c.lex.prefix]
property suffix_:
def __get__(self):
return self.vocab.strings[self.c.lex.suffix]
property lang_:
def __get__(self):
return self.vocab.strings[self.c.lex.lang]
property lemma_:
"""Base form of the word, with no inflectional suffixes.
RETURNS (unicode): Token lemma.
"""
def __get__(self):
return self.vocab.strings[self.c.lemma]
def __set__(self, unicode lemma_):
self.c.lemma = self.vocab.strings[lemma_]
property pos_:
def __get__(self):
return parts_of_speech.NAMES[self.c.pos]
property tag_:
def __get__(self):
return self.vocab.strings[self.c.tag]
def __set__(self, tag):
self.tag = self.vocab.strings[tag]
property dep_:
def __get__(self):
return self.vocab.strings[self.c.dep]
def __set__(self, unicode label):
self.c.dep = self.vocab.strings[label]
property is_oov:
def __get__(self): return Lexeme.c_check_flag(self.c.lex, IS_OOV)
property is_stop:
def __get__(self): return Lexeme.c_check_flag(self.c.lex, IS_STOP)
property is_alpha:
def __get__(self): return Lexeme.c_check_flag(self.c.lex, IS_ALPHA)
property is_ascii:
def __get__(self): return Lexeme.c_check_flag(self.c.lex, IS_ASCII)
property is_digit:
def __get__(self): return Lexeme.c_check_flag(self.c.lex, IS_DIGIT)
property is_lower:
def __get__(self): return Lexeme.c_check_flag(self.c.lex, IS_LOWER)
property is_title:
def __get__(self): return Lexeme.c_check_flag(self.c.lex, IS_TITLE)
property is_punct:
def __get__(self): return Lexeme.c_check_flag(self.c.lex, IS_PUNCT)
property is_space:
def __get__(self): return Lexeme.c_check_flag(self.c.lex, IS_SPACE)
property is_bracket:
def __get__(self): return Lexeme.c_check_flag(self.c.lex, IS_BRACKET)
property is_quote:
def __get__(self): return Lexeme.c_check_flag(self.c.lex, IS_QUOTE)
property is_left_punct:
def __get__(self): return Lexeme.c_check_flag(self.c.lex, IS_LEFT_PUNCT)
property is_right_punct:
def __get__(self): return Lexeme.c_check_flag(self.c.lex, IS_RIGHT_PUNCT)
property like_url:
def __get__(self): return Lexeme.c_check_flag(self.c.lex, LIKE_URL)
property like_num:
def __get__(self): return Lexeme.c_check_flag(self.c.lex, LIKE_NUM)
property like_email:
def __get__(self): return Lexeme.c_check_flag(self.c.lex, LIKE_EMAIL)
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