mirror of https://github.com/explosion/spaCy.git
193 lines
5.7 KiB
Cython
193 lines
5.7 KiB
Cython
# cython: profile=True
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from __future__ import unicode_literals
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from libc.stdint cimport uint32_t, int32_t
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from libc.stdint cimport uint64_t
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from libc.math cimport exp as c_exp
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from libcpp.queue cimport priority_queue
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from libcpp.pair cimport pair
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from ..structs cimport UniStr
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from ..strings cimport slice_unicode
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from cymem.cymem cimport Address, Pool
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from preshed.maps cimport PreshMap
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from preshed.counter cimport PreshCounter
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from ..attrs cimport ORTH, ID, SPACY, TAG, HEAD, DEP, ENT_IOB, ENT_TYPE
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from ..tokens.doc cimport Doc
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from ..vocab cimport Vocab
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from ..structs cimport LexemeC
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from ..typedefs cimport attr_t
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from .bits cimport BitArray
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from .huffman cimport HuffmanCodec
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from os import path
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import numpy
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from .. import util
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cimport cython
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# Format
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# - Total number of bytes in message (32 bit int) --- handled outside this
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# - Number of words (32 bit int)
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# - Words, terminating in an EOL symbol, huffman coded ~12 bits per word
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# - Spaces 1 bit per word
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# - Attributes:
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# POS tag
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# Head offset
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# Dep label
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# Entity IOB
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# Entity tag
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cdef class _BinaryCodec:
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def encode(self, attr_t[:] msg, BitArray bits):
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cdef int i
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for i in range(len(msg)):
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bits.append(msg[i])
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def decode(self, BitArray bits, attr_t[:] msg):
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cdef int i = 0
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for bit in bits:
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msg[i] = bit
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i += 1
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if i == len(msg):
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break
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def _gen_orths(Vocab vocab):
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cdef attr_t orth
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cdef size_t addr
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for orth, addr in vocab._by_orth.items():
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lex = <LexemeC*>addr
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yield orth, c_exp(lex.prob)
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def _gen_chars(Vocab vocab):
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cdef attr_t orth
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cdef size_t addr
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char_weights = {chr(i): 1e-20 for i in range(256)}
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cdef unicode string
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cdef bytes char
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cdef bytes utf8_str
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for orth, addr in vocab._by_orth.items():
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lex = <LexemeC*>addr
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string = vocab.strings[lex.orth]
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utf8_str = string.encode('utf8')
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for char in utf8_str:
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char_weights.setdefault(char, 0.0)
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char_weights[char] += c_exp(lex.prob)
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char_weights[b' '] += c_exp(lex.prob)
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return char_weights.items()
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cdef class Packer:
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def __init__(self, Vocab vocab, attr_freqs, char_freqs=None):
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if char_freqs is None:
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char_freqs = _gen_chars(vocab)
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self.vocab = vocab
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self.orth_codec = HuffmanCodec(_gen_orths(vocab))
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self.char_codec = HuffmanCodec(char_freqs)
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codecs = []
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attrs = []
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for attr, freqs in sorted(attr_freqs):
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if attr in (ORTH, ID, SPACY):
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continue
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codecs.append(HuffmanCodec(freqs))
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attrs.append(attr)
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self._codecs = tuple(codecs)
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self.attrs = tuple(attrs)
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@classmethod
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def from_dir(cls, Vocab vocab, data_dir):
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return cls(vocab, util.read_encoding_freqs(data_dir))
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def pack(self, Doc doc):
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bits = self._orth_encode(doc)
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if bits is None:
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bits = self._char_encode(doc)
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cdef int i
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if self.attrs:
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array = doc.to_array(self.attrs)
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for i, codec in enumerate(self._codecs):
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codec.encode_int32(array[:, i], bits)
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return bits
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def unpack(self, BitArray bits):
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bits.seek(0)
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cdef int32_t length = bits.read32()
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if length >= 0:
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doc = self._orth_decode(bits, length)
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else:
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doc = self._char_decode(bits, -length)
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array = numpy.zeros(shape=(len(doc), len(self._codecs)), dtype=numpy.int32)
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for i, codec in enumerate(self._codecs):
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codec.decode_int32(bits, array[:, i])
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doc.from_array(self.attrs, array)
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return doc
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def _orth_encode(self, Doc doc):
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cdef BitArray bits = BitArray()
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cdef int32_t length = len(doc)
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bits.extend(length, 32)
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orths = doc.to_array([ORTH])
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n_bits = self.orth_codec.encode_int32(orths[:, 0], bits)
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if n_bits == 0:
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return None
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for token in doc:
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bits.append(bool(token.whitespace_))
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return bits
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def _orth_decode(self, BitArray bits, n):
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orths = numpy.ndarray(shape=(n,), dtype=numpy.int32)
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self.orth_codec.decode_int32(bits, orths)
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orths_and_spaces = zip(orths, bits)
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cdef Doc doc = Doc(self.vocab, orths_and_spaces)
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return doc
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def _char_encode(self, Doc doc):
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cdef bytes utf8_str = doc.string.encode('utf8')
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cdef BitArray bits = BitArray()
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cdef int32_t length = len(utf8_str)
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# Signal chars with negative length
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bits.extend(-length, 32)
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self.char_codec.encode(utf8_str, bits)
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cdef int i, j
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for i in range(doc.length):
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for j in range(doc.data[i].lex.length-1):
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bits.append(False)
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bits.append(True)
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if doc.data[i].spacy:
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bits.append(False)
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return bits
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def _char_decode(self, BitArray bits, n):
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cdef bytearray utf8_str = bytearray(n)
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self.char_codec.decode(bits, utf8_str)
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cdef unicode string = utf8_str.decode('utf8')
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cdef Doc tokens = Doc(self.vocab)
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cdef int start = 0
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cdef bint is_spacy
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cdef UniStr span
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cdef int length = len(string)
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cdef int i = 0
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cdef bint is_end_token
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for is_end_token in bits:
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if is_end_token:
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slice_unicode(&span, string, start, i+1)
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lex = self.vocab.get(tokens.mem, &span)
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is_spacy = (i+1) < length and string[i+1] == u' '
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tokens.push_back(lex, is_spacy)
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start = i + 1 + is_spacy
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i += 1
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if i >= n:
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break
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return tokens
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