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300 lines
9.2 KiB
Cython
300 lines
9.2 KiB
Cython
# cython: embedsignature=True
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from cython.view cimport array as cvarray
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from preshed.maps cimport PreshMap
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from preshed.counter cimport PreshCounter
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from .vocab cimport EMPTY_LEXEME
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from .typedefs cimport attr_id_t, attr_t
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from .typedefs cimport LEMMA
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from .typedefs cimport ID, ORTH, NORM, LOWER, SHAPE, PREFIX, SUFFIX, LENGTH, CLUSTER
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from .typedefs cimport POS, LEMMA
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from unidecode import unidecode
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cimport numpy
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import numpy
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cimport cython
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DEF PADDING = 5
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cdef int bounds_check(int i, int length, int padding) except -1:
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if (i + padding) < 0:
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raise IndexError
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if (i - padding) >= length:
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raise IndexError
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cdef attr_t get_token_attr(const TokenC* token, attr_id_t feat_name) nogil:
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if feat_name == LEMMA:
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return token.lemma
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elif feat_name == POS:
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return token.pos
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else:
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return get_lex_attr(token.lex, feat_name)
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cdef attr_t get_lex_attr(const LexemeC* lex, attr_id_t feat_name) nogil:
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if feat_name < (sizeof(flags_t) * 8):
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return check_flag(lex, feat_name)
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elif feat_name == ID:
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return lex.id
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elif feat_name == ORTH:
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return lex.orth
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elif feat_name == LOWER:
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return lex.lower
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elif feat_name == NORM:
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return lex.norm
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elif feat_name == SHAPE:
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return lex.shape
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elif feat_name == PREFIX:
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return lex.prefix
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elif feat_name == SUFFIX:
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return lex.suffix
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elif feat_name == LENGTH:
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return lex.length
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elif feat_name == CLUSTER:
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return lex.cluster
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else:
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return 0
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cdef class Tokens:
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"""Access and set annotations onto some text.
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"""
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def __init__(self, Vocab vocab, unicode string):
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self.vocab = vocab
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self._string = string
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string_length = len(string)
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if string_length >= 3:
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size = int(string_length / 3.0)
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else:
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size = 5
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self.mem = Pool()
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# Guarantee self.lex[i-x], for any i >= 0 and x < padding is in bounds
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# However, we need to remember the true starting places, so that we can
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# realloc.
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data_start = <TokenC*>self.mem.alloc(size + (PADDING*2), sizeof(TokenC))
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cdef int i
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for i in range(size + (PADDING*2)):
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data_start[i].lex = &EMPTY_LEXEME
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self.data = data_start + PADDING
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self.max_length = size
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self.length = 0
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def sentences(self):
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cdef int i
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sentences = []
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cdef Tokens sent = Tokens(self.vocab, self._string[self.data[0].idx:])
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cdef attr_t period = self.vocab.strings['.']
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cdef attr_t question = self.vocab.strings['?']
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cdef attr_t exclamation = self.vocab.strings['!']
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spans = []
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start = None
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for i in range(self.length):
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if start is None:
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start = i
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if self.data[i].lex.orth == period or self.data[i].lex.orth == exclamation or \
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self.data[i].lex.orth == question:
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spans.append((start, i+1))
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start = None
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if start is not None:
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spans.append((start, self.length))
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return spans
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def __getitem__(self, i):
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"""Retrieve a token.
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Returns:
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token (Token):
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"""
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if i < 0:
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i = self.length - i
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bounds_check(i, self.length, PADDING)
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return Token(self, i)
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def __iter__(self):
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"""Iterate over the tokens.
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Yields:
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token (Token):
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"""
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for i in range(self.length):
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yield self[i]
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def __len__(self):
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return self.length
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def __unicode__(self):
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cdef const TokenC* last = &self.data[self.length - 1]
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return self._string[:last.idx + last.lex.length]
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def __str__(self):
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return unidecode(unicode(self))
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cdef int push_back(self, int idx, LexemeOrToken lex_or_tok) except -1:
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if self.length == self.max_length:
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self._realloc(self.length * 2)
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cdef TokenC* t = &self.data[self.length]
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if LexemeOrToken is TokenC_ptr:
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t[0] = lex_or_tok[0]
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else:
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t.lex = lex_or_tok
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t.idx = idx
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self.length += 1
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return idx + t.lex.length
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@cython.boundscheck(False)
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cpdef long[:,:] to_array(self, object attr_ids):
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"""Given a list of M attribute IDs, export the tokens to a numpy ndarray
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of shape N*M, where N is the length of the sentence.
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Arguments:
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attr_ids (list[int]): A list of attribute ID ints.
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Returns:
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feat_array (numpy.ndarray[long, ndim=2]):
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A feature matrix, with one row per word, and one column per attribute
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indicated in the input 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 long[:,:] output = cvarray(shape=(self.length, len(attr_ids)),
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itemsize=sizeof(long), format="l")
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for i in range(self.length):
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for j, feature in enumerate(attr_ids):
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output[i, j] = get_token_attr(&self.data[i], feature)
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return output
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def count_by(self, attr_id_t attr_id, exclude=None):
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"""Produce a dict of {attribute (int): count (ints)} frequencies, keyed
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by the values of the given attribute ID.
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>>> from spacy.en import English, attrs
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>>> nlp = English()
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>>> tokens = nlp(u'apple apple orange banana')
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>>> tokens.count_by(attrs.ORTH)
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{12800L: 1, 11880L: 2, 7561L: 1}
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>>> tokens.to_array([attrs.ORTH])
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array([[11880],
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[11880],
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[ 7561],
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[12800]])
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"""
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cdef int i
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cdef attr_t attr
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cdef size_t count
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cdef PreshCounter counts = PreshCounter(2 ** 8)
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for i in range(self.length):
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if exclude is not None and exclude(self[i]):
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continue
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attr = get_token_attr(&self.data[i], attr_id)
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counts.inc(attr, 1)
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return dict(counts)
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def _realloc(self, new_size):
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self.max_length = new_size
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n = new_size + (PADDING * 2)
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# What we're storing is a "padded" array. We've jumped forward PADDING
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# places, and are storing the pointer to that. This way, we can access
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# words out-of-bounds, and get out-of-bounds markers.
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# Now that we want to realloc, we need the address of the true start,
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# so we jump the pointer back PADDING places.
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cdef TokenC* data_start = self.data - PADDING
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data_start = <TokenC*>self.mem.realloc(data_start, n * sizeof(TokenC))
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self.data = data_start + PADDING
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cdef int i
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for i in range(self.length, self.max_length + PADDING):
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self.data[i].lex = &EMPTY_LEXEME
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@cython.freelist(64)
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cdef class Token:
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"""An individual token."""
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def __init__(self, Tokens tokens, int i):
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self._seq = tokens
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self.i = i
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cdef const TokenC* t = &tokens.data[i]
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self.idx = t.idx
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self.cluster = t.lex.cluster
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self.length = t.lex.length
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self.orth = t.lex.orth
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self.lower = t.lex.lower
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self.norm = t.lex.norm
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self.shape = t.lex.shape
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self.prefix = t.lex.prefix
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self.suffix = t.lex.suffix
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self.prob = t.lex.prob
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self.sentiment = t.lex.sentiment
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self.flags = t.lex.flags
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self.lemma = t.lemma
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self.tag = t.tag
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self.dep = t.dep
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self.repvec = numpy.asarray(<float[:300,]> t.lex.repvec)
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cdef int next_idx = (t+1).idx
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if next_idx <= self.idx:
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next_idx = self.idx + self.length
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self.string = tokens._string[self.idx:next_idx]
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def __len__(self):
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"""The number of unicode code-points in the original string.
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Returns:
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length (int):
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"""
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return self._seq.data[self.i].lex.length
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property head:
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"""The token predicted by the parser to be the head of the current token."""
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def __get__(self):
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cdef const TokenC* t = &self._seq.data[self.i]
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return Token(self._seq, self.i + t.head)
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property whitespace:
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def __get__(self):
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return self.string[self.length:]
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property orth_:
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def __get__(self):
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return self._seq.vocab.strings[self.orth]
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property lower_:
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def __get__(self):
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return self._seq.vocab.strings[self.lower]
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property norm_:
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def __get__(self):
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return self._seq.vocab.strings[self.norm]
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property shape_:
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def __get__(self):
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return self._seq.vocab.strings[self.shape]
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property prefix_:
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def __get__(self):
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return self._seq.vocab.strings[self.prefix]
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property suffix_:
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def __get__(self):
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return self._seq.vocab.strings[self.suffix]
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property lemma_:
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def __get__(self):
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cdef const TokenC* t = &self._seq.data[self.i]
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if t.lemma == 0:
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return self.string
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cdef unicode py_ustr = self._seq.vocab.strings[t.lemma]
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return py_ustr
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property tag_:
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def __get__(self):
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return self._seq.tag_names[self.tag]
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property dep_:
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def __get__(self):
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return self._seq.dep_names[self.dep]
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