spaCy/spacy/vocab.pyx

323 lines
12 KiB
Cython

from __future__ import unicode_literals
from libc.stdio cimport fopen, fclose, fread, fwrite, FILE
from libc.string cimport memset
from libc.stdint cimport int32_t
import bz2
from os import path
import codecs
import math
import json
from .lexeme cimport EMPTY_LEXEME
from .lexeme cimport Lexeme
from .strings cimport hash_string
from .orth cimport word_shape
from .typedefs cimport attr_t
from .cfile cimport CFile
from .lemmatizer import Lemmatizer
from cymem.cymem cimport Address
from . import util
from .serialize.packer cimport Packer
from .attrs cimport PROB
DEF MAX_VEC_SIZE = 100000
cdef float[MAX_VEC_SIZE] EMPTY_VEC
memset(EMPTY_VEC, 0, sizeof(EMPTY_VEC))
memset(&EMPTY_LEXEME, 0, sizeof(LexemeC))
EMPTY_LEXEME.repvec = EMPTY_VEC
cdef class Vocab:
'''A map container for a language's LexemeC structs.
'''
def __init__(self, get_lex_attr=None, tag_map=None, vectors=None):
self.mem = Pool()
self._by_hash = PreshMap()
self._by_orth = PreshMap()
self.strings = StringStore()
self.get_lex_attr = get_lex_attr
self.morphology = Morphology(self.strings, tag_map, Lemmatizer({}, {}, {}))
self.length = 1
self._serializer = None
@classmethod
def from_dir(cls, data_dir, get_lex_attr=None, vectors=None):
if not path.exists(data_dir):
raise IOError("Directory %s not found -- cannot load Vocab." % data_dir)
if not path.isdir(data_dir):
raise IOError("Path %s is a file, not a dir -- cannot load Vocab." % data_dir)
tag_map = json.load(open(path.join(data_dir, 'tag_map.json')))
cdef Vocab self = cls(get_lex_attr=get_lex_attr, vectors=vectors, tag_map=tag_map)
self.load_lexemes(path.join(data_dir, 'strings.txt'), path.join(data_dir, 'lexemes.bin'))
if vectors is None and path.exists(path.join(data_dir, 'vec.bin')):
self.repvec_length = self.load_rep_vectors(path.join(data_dir, 'vec.bin'))
return self
property serializer:
def __get__(self):
if self._serializer is None:
freqs = []
if self.data_dir is not None:
freqs_loc = path.join(self.data_dir, 'serializer.json')
if path.exists(freqs_loc):
freqs = json.load(open(freqs_loc))
self._serializer = Packer(self, freqs)
return self._serializer
def __len__(self):
"""The current number of lexemes stored."""
return self.length
cdef const LexemeC* get(self, Pool mem, unicode string) except NULL:
'''Get a pointer to a LexemeC from the lexicon, creating a new Lexeme
if necessary, using memory acquired from the given pool. If the pool
is the lexicon's own memory, the lexeme is saved in the lexicon.'''
if string == u'':
return &EMPTY_LEXEME
cdef LexemeC* lex
cdef hash_t key = hash_string(string)
lex = <LexemeC*>self._by_hash.get(key)
cdef size_t addr
if lex != NULL:
assert lex.orth == self.strings[string]
return lex
else:
return self._new_lexeme(mem, string)
cdef const LexemeC* get_by_orth(self, Pool mem, attr_t orth) except NULL:
'''Get a pointer to a LexemeC from the lexicon, creating a new Lexeme
if necessary, using memory acquired from the given pool. If the pool
is the lexicon's own memory, the lexeme is saved in the lexicon.'''
if orth == 0:
return &EMPTY_LEXEME
cdef LexemeC* lex
lex = <LexemeC*>self._by_orth.get(orth)
if lex != NULL:
return lex
else:
return self._new_lexeme(mem, self.strings[orth])
cdef const LexemeC* _new_lexeme(self, Pool mem, unicode string) except NULL:
cdef hash_t key
cdef bint is_oov = mem is not self.mem
mem = self.mem
if len(string) < 3:
mem = self.mem
lex = <LexemeC*>mem.alloc(sizeof(LexemeC), 1)
lex.orth = self.strings[string]
lex.length = len(string)
lex.id = self.length
if self.get_lex_attr is not None:
for attr, func in self.get_lex_attr.items():
value = func(string)
if isinstance(value, unicode):
value = self.strings[value]
if attr == PROB:
lex.prob = value
else:
Lexeme.set_struct_attr(lex, attr, value)
if is_oov:
lex.id = 0
else:
key = hash_string(string)
self._add_lex_to_vocab(key, lex)
assert lex != NULL, string
return lex
cdef int _add_lex_to_vocab(self, hash_t key, const LexemeC* lex) except -1:
self._by_hash.set(key, <void*>lex)
self._by_orth.set(lex.orth, <void*>lex)
self.length += 1
def __iter__(self):
cdef attr_t orth
cdef size_t addr
for orth, addr in self._by_orth.items():
yield Lexeme(self, orth)
def __getitem__(self, id_or_string):
'''Retrieve a lexeme, given an int ID or a unicode string. If a previously
unseen unicode string is given, a new lexeme is created and stored.
Args:
id_or_string (int or unicode):
The integer ID of a word, or its unicode string. If an int >= Lexicon.size,
IndexError is raised. If id_or_string is neither an int nor a unicode string,
ValueError is raised.
Returns:
lexeme (Lexeme):
An instance of the Lexeme Python class, with data copied on
instantiation.
'''
cdef attr_t orth
if type(id_or_string) == unicode:
orth = self.strings[id_or_string]
else:
orth = id_or_string
return Lexeme(self, orth)
cdef const TokenC* make_fused_token(self, substrings) except NULL:
cdef int i
tokens = <TokenC*>self.mem.alloc(len(substrings) + 1, sizeof(TokenC))
for i, props in enumerate(substrings):
token = &tokens[i]
# Set the special tokens up to have morphology and lemmas if
# specified, otherwise use the part-of-speech tag (if specified)
token.lex = <LexemeC*>self.get(self.mem, props['F'])
if 'pos' in props:
self.morphology.assign_tag(token, props['pos'])
if 'L' in props:
tokens[i].lemma = self.strings[props['L']]
for feature, value in props.get('morph', {}).items():
self.morphology.assign_feature(&token.morph, feature, value)
return tokens
def dump(self, loc):
if path.exists(loc):
assert not path.isdir(loc)
cdef bytes bytes_loc = loc.encode('utf8') if type(loc) == unicode else loc
cdef CFile fp = CFile(bytes_loc, 'wb')
cdef size_t st
cdef size_t addr
cdef hash_t key
for key, addr in self._by_hash.items():
lexeme = <LexemeC*>addr
fp.write_from(&lexeme.orth, sizeof(lexeme.orth), 1)
fp.write_from(lexeme, sizeof(LexemeC), 1)
fp.close()
def load_lexemes(self, strings_loc, loc):
self.strings.load(strings_loc)
if not path.exists(loc):
raise IOError('LexemeCs file not found at %s' % loc)
cdef bytes bytes_loc = loc.encode('utf8') if type(loc) == unicode else loc
cdef FILE* fp = fopen(<char*>bytes_loc, b'rb')
if fp == NULL:
raise IOError('lexemes data file present, but cannot open from ' % loc)
cdef size_t st
cdef LexemeC* lexeme
cdef attr_t orth
cdef hash_t key
cdef unicode py_str
i = 0
while True:
st = fread(&orth, sizeof(orth), 1, fp)
if st != 1:
break
lexeme = <LexemeC*>self.mem.alloc(sizeof(LexemeC), 1)
# Copies data from the file into the lexeme
st = fread(lexeme, sizeof(LexemeC), 1, fp)
lexeme.repvec = EMPTY_VEC
if st != 1:
break
if orth != lexeme.orth:
# TODO: Improve this error message, pending resolution to Issue #64
raise IOError('Error reading from lexemes.bin. Integrity check fails.')
py_str = self.strings[orth]
key = hash_string(py_str)
self._by_hash.set(key, lexeme)
self._by_orth.set(lexeme.orth, lexeme)
self.length += 1
i += 1
fclose(fp)
def load_rep_vectors(self, loc):
cdef CFile file_ = CFile(loc, b'rb')
cdef int32_t word_len
cdef int32_t vec_len
cdef int32_t prev_vec_len = 0
cdef float* vec
cdef Address mem
cdef attr_t string_id
cdef bytes py_word
cdef vector[float*] vectors
cdef int i
cdef Pool tmp_mem = Pool()
while True:
try:
file_.read_into(&word_len, sizeof(word_len), 1)
except IOError:
break
file_.read_into(&vec_len, sizeof(vec_len), 1)
if prev_vec_len != 0 and vec_len != prev_vec_len:
raise VectorReadError.mismatched_sizes(loc, vec_len, prev_vec_len)
if 0 >= vec_len >= MAX_VEC_SIZE:
raise VectorReadError.bad_size(loc, vec_len)
chars = <char*>file_.alloc_read(tmp_mem, word_len, sizeof(char))
vec = <float*>file_.alloc_read(self.mem, vec_len, sizeof(float))
string_id = self.strings[chars[:word_len]]
while string_id >= vectors.size():
vectors.push_back(EMPTY_VEC)
assert vec != NULL
vectors[string_id] = vec
cdef LexemeC* lex
cdef size_t lex_addr
for orth, lex_addr in self._by_orth.items():
lex = <LexemeC*>lex_addr
if lex.lower < vectors.size():
lex.repvec = vectors[lex.lower]
for i in range(vec_len):
lex.l2_norm += (lex.repvec[i] * lex.repvec[i])
lex.l2_norm = math.sqrt(lex.l2_norm)
else:
lex.repvec = EMPTY_VEC
return vec_len
def write_binary_vectors(in_loc, out_loc):
cdef CFile out_file = CFile(out_loc, 'wb')
cdef Address mem
cdef int32_t word_len
cdef int32_t vec_len
cdef char* chars
with bz2.BZ2File(in_loc, 'r') as file_:
for line in file_:
pieces = line.split()
word = pieces.pop(0)
mem = Address(len(pieces), sizeof(float))
vec = <float*>mem.ptr
for i, val_str in enumerate(pieces):
vec[i] = float(val_str)
word_len = len(word)
vec_len = len(pieces)
out_file.write_from(&word_len, 1, sizeof(word_len))
out_file.write_from(&vec_len, 1, sizeof(vec_len))
chars = <char*>word
out_file.write_from(chars, len(word), sizeof(char))
out_file.write_from(vec, vec_len, sizeof(float))
class VectorReadError(Exception):
@classmethod
def mismatched_sizes(cls, loc, prev_size, curr_size):
return cls(
"Error reading word vectors from %s.\n"
"All vectors must be the same size.\n"
"Prev size: %d\n"
"Curr size: %d" % (loc, prev_size, curr_size))
@classmethod
def bad_size(cls, loc, size):
return cls(
"Error reading word vectors from %s.\n"
"Vector size: %d\n"
"Max size: %d\n"
"Min size: 1\n" % (loc, size, MAX_VEC_SIZE))