mirror of
https://github.com/explosion/spaCy.git
synced 2024-12-26 09:56:28 +03:00
8aa7882762
See #3028. The solution in this patch is pretty debateable. What we do is give the TokenC struct a .norm field, by repurposing the previously idle .sense attribute. It's nice to repurpose a previous field because it means the TokenC doesn't change size, so even if someone's using the internals very deeply, nothing will break. The weird thing here is that the TokenC and the LexemeC both have an attribute named NORM. This arguably assists in backwards compatibility. On the other hand, maybe it's really bad! We're changing the semantics of the attribute subtly, so maybe it's better if someone calling lex.norm gets a breakage, and instead is told to write lex.default_norm? Overall I believe this patch makes the NORM feature work the way we sort of expected it to work. Certainly it's much more like how the docs describe it, and more in line with how we've been directing people to use the norm attribute. We'll also be able to use token.norm to do stuff like spelling correction, which is pretty cool.
540 lines
21 KiB
Cython
540 lines
21 KiB
Cython
# coding: utf8
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# cython: profile=True
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from __future__ import unicode_literals
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import numpy
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import srsly
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from collections import OrderedDict
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from thinc.neural.util import get_array_module
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from .lexeme cimport EMPTY_LEXEME
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from .lexeme cimport Lexeme
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from .typedefs cimport attr_t
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from .tokens.token cimport Token
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from .attrs cimport PROB, LANG, ORTH, TAG
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from .structs cimport SerializedLexemeC
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from .compat import copy_reg, basestring_
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from .errors import Errors
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from .lemmatizer import Lemmatizer
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from .attrs import intify_attrs, NORM
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from .vectors import Vectors
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from ._ml import link_vectors_to_models
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from . import util
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cdef class Vocab:
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"""A look-up table that allows you to access `Lexeme` objects. The `Vocab`
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instance also provides access to the `StringStore`, and owns underlying
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C-data that is shared between `Doc` objects.
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"""
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def __init__(self, lex_attr_getters=None, tag_map=None, lemmatizer=None,
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strings=tuple(), oov_prob=-20., **deprecated_kwargs):
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"""Create the vocabulary.
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lex_attr_getters (dict): A dictionary mapping attribute IDs to
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functions to compute them. Defaults to `None`.
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tag_map (dict): Dictionary mapping fine-grained tags to coarse-grained
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parts-of-speech, and optionally morphological attributes.
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lemmatizer (object): A lemmatizer. Defaults to `None`.
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strings (StringStore): StringStore that maps strings to integers, and
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vice versa.
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RETURNS (Vocab): The newly constructed object.
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"""
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lex_attr_getters = lex_attr_getters if lex_attr_getters is not None else {}
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tag_map = tag_map if tag_map is not None else {}
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if lemmatizer in (None, True, False):
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lemmatizer = Lemmatizer({}, {}, {})
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self.cfg = {'oov_prob': oov_prob}
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self.mem = Pool()
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self._by_orth = PreshMap()
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self.strings = StringStore()
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self.length = 0
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if strings:
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for string in strings:
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_ = self[string]
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self.lex_attr_getters = lex_attr_getters
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self.morphology = Morphology(self.strings, tag_map, lemmatizer)
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self.vectors = Vectors()
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property lang:
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def __get__(self):
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langfunc = None
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if self.lex_attr_getters:
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langfunc = self.lex_attr_getters.get(LANG, None)
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return langfunc('_') if langfunc else ''
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def __len__(self):
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"""The current number of lexemes stored.
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RETURNS (int): The current number of lexemes stored.
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"""
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return self.length
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def add_flag(self, flag_getter, int flag_id=-1):
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"""Set a new boolean flag to words in the vocabulary.
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The flag_getter function will be called over the words currently in the
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vocab, and then applied to new words as they occur. You'll then be able
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to access the flag value on each token using token.check_flag(flag_id).
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See also: `Lexeme.set_flag`, `Lexeme.check_flag`, `Token.set_flag`,
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`Token.check_flag`.
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flag_getter (callable): A function `f(unicode) -> bool`, to get the
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flag value.
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flag_id (int): An integer between 1 and 63 (inclusive), specifying
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the bit at which the flag will be stored. If -1, the lowest
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available bit will be chosen.
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RETURNS (int): The integer ID by which the flag value can be checked.
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EXAMPLE:
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>>> my_product_getter = lambda text: text in ['spaCy', 'dislaCy']
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>>> MY_PRODUCT = nlp.vocab.add_flag(my_product_getter)
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>>> doc = nlp(u'I like spaCy')
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>>> assert doc[2].check_flag(MY_PRODUCT) == True
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"""
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if flag_id == -1:
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for bit in range(1, 64):
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if bit not in self.lex_attr_getters:
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flag_id = bit
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break
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else:
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raise ValueError(Errors.E062)
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elif flag_id >= 64 or flag_id < 1:
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raise ValueError(Errors.E063.format(value=flag_id))
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for lex in self:
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lex.set_flag(flag_id, flag_getter(lex.orth_))
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self.lex_attr_getters[flag_id] = flag_getter
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return flag_id
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cdef const LexemeC* get(self, Pool mem, unicode string) except NULL:
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"""Get a pointer to a `LexemeC` from the lexicon, creating a new
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`Lexeme` if necessary using memory acquired from the given pool. If the
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pool is the lexicon's own memory, the lexeme is saved in the lexicon.
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"""
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if string == u'':
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return &EMPTY_LEXEME
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cdef LexemeC* lex
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cdef hash_t key = self.strings[string]
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lex = <LexemeC*>self._by_orth.get(key)
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cdef size_t addr
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if lex != NULL:
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assert lex.orth in self.strings
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if lex.orth != key:
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raise KeyError(Errors.E064.format(string=lex.orth,
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orth=key, orth_id=string))
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return lex
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else:
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return self._new_lexeme(mem, string)
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cdef const LexemeC* get_by_orth(self, Pool mem, attr_t orth) except NULL:
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"""Get a pointer to a `LexemeC` from the lexicon, creating a new
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`Lexeme` if necessary using memory acquired from the given pool. If the
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pool is the lexicon's own memory, the lexeme is saved in the lexicon.
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"""
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if orth == 0:
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return &EMPTY_LEXEME
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cdef LexemeC* lex
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lex = <LexemeC*>self._by_orth.get(orth)
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if lex != NULL:
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return lex
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else:
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return self._new_lexeme(mem, self.strings[orth])
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cdef const LexemeC* _new_lexeme(self, Pool mem, unicode string) except NULL:
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if len(string) < 3 or self.length < 10000:
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mem = self.mem
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cdef bint is_oov = mem is not self.mem
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lex = <LexemeC*>mem.alloc(sizeof(LexemeC), 1)
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lex.orth = self.strings.add(string)
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lex.length = len(string)
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if self.vectors is not None:
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lex.id = self.vectors.key2row.get(lex.orth, 0)
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else:
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lex.id = 0
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if self.lex_attr_getters is not None:
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for attr, func in self.lex_attr_getters.items():
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value = func(string)
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if isinstance(value, unicode):
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value = self.strings.add(value)
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if attr == PROB:
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lex.prob = value
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elif value is not None:
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Lexeme.set_struct_attr(lex, attr, value)
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if not is_oov:
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self._add_lex_to_vocab(lex.orth, lex)
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if lex == NULL:
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raise ValueError(Errors.E085.format(string=string))
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return lex
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cdef int _add_lex_to_vocab(self, hash_t key, const LexemeC* lex) except -1:
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self._by_orth.set(lex.orth, <void*>lex)
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self.length += 1
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def __contains__(self, key):
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"""Check whether the string or int key has an entry in the vocabulary.
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string (unicode): The ID string.
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RETURNS (bool) Whether the string has an entry in the vocabulary.
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"""
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cdef hash_t int_key
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if isinstance(key, bytes):
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int_key = self.strings[key.decode('utf8')]
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elif isinstance(key, unicode):
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int_key = self.strings[key]
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else:
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int_key = key
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lex = self._by_orth.get(int_key)
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return lex is not NULL
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def __iter__(self):
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"""Iterate over the lexemes in the vocabulary.
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YIELDS (Lexeme): An entry in the vocabulary.
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"""
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cdef attr_t key
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cdef size_t addr
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for key, addr in self._by_orth.items():
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lex = Lexeme(self, key)
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yield lex
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def __getitem__(self, id_or_string):
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"""Retrieve a lexeme, given an int ID or a unicode string. If a
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previously unseen unicode string is given, a new lexeme is created and
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stored.
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id_or_string (int or unicode): The integer ID of a word, or its unicode
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string. If `int >= Lexicon.size`, `IndexError` is raised. If
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`id_or_string` is neither an int nor a unicode string, `ValueError`
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is raised.
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RETURNS (Lexeme): The lexeme indicated by the given ID.
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EXAMPLE:
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>>> apple = nlp.vocab.strings['apple']
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>>> assert nlp.vocab[apple] == nlp.vocab[u'apple']
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"""
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cdef attr_t orth
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if isinstance(id_or_string, unicode):
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orth = self.strings.add(id_or_string)
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else:
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orth = id_or_string
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return Lexeme(self, orth)
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cdef const TokenC* make_fused_token(self, substrings) except NULL:
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cdef int i
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tokens = <TokenC*>self.mem.alloc(len(substrings) + 1, sizeof(TokenC))
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for i, props in enumerate(substrings):
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props = intify_attrs(props, strings_map=self.strings,
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_do_deprecated=True)
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token = &tokens[i]
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# Set the special tokens up to have arbitrary attributes
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lex = <LexemeC*>self.get_by_orth(self.mem, props[ORTH])
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token.lex = lex
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if TAG in props:
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self.morphology.assign_tag(token, props[TAG])
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for attr_id, value in props.items():
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Token.set_struct_attr(token, attr_id, value)
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# NORM is the only one that overlaps between the two
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# (which is maybe not great?)
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if attr_id != NORM:
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Lexeme.set_struct_attr(lex, attr_id, value)
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return tokens
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@property
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def vectors_length(self):
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return self.vectors.data.shape[1]
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def reset_vectors(self, *, width=None, shape=None):
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"""Drop the current vector table. Because all vectors must be the same
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width, you have to call this to change the size of the vectors.
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"""
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if width is not None and shape is not None:
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raise ValueError(Errors.E065.format(width=width, shape=shape))
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elif shape is not None:
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self.vectors = Vectors(shape=shape)
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else:
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width = width if width is not None else self.vectors.data.shape[1]
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self.vectors = Vectors(shape=(self.vectors.shape[0], width))
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def prune_vectors(self, nr_row, batch_size=1024):
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"""Reduce the current vector table to `nr_row` unique entries. Words
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mapped to the discarded vectors will be remapped to the closest vector
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among those remaining.
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For example, suppose the original table had vectors for the words:
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['sat', 'cat', 'feline', 'reclined']. If we prune the vector table to,
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two rows, we would discard the vectors for 'feline' and 'reclined'.
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These words would then be remapped to the closest remaining vector
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-- so "feline" would have the same vector as "cat", and "reclined"
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would have the same vector as "sat".
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The similarities are judged by cosine. The original vectors may
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be large, so the cosines are calculated in minibatches, to reduce
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memory usage.
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nr_row (int): The number of rows to keep in the vector table.
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batch_size (int): Batch of vectors for calculating the similarities.
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Larger batch sizes might be faster, while temporarily requiring
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more memory.
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RETURNS (dict): A dictionary keyed by removed words mapped to
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`(string, score)` tuples, where `string` is the entry the removed
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word was mapped to, and `score` the similarity score between the
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two words.
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"""
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xp = get_array_module(self.vectors.data)
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# Make prob negative so it sorts by rank ascending
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# (key2row contains the rank)
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priority = [(-lex.prob, self.vectors.key2row[lex.orth], lex.orth)
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for lex in self if lex.orth in self.vectors.key2row]
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priority.sort()
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indices = xp.asarray([i for (prob, i, key) in priority], dtype='i')
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keys = xp.asarray([key for (prob, i, key) in priority], dtype='uint64')
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keep = xp.ascontiguousarray(self.vectors.data[indices[:nr_row]])
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toss = xp.ascontiguousarray(self.vectors.data[indices[nr_row:]])
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self.vectors = Vectors(data=keep, keys=keys)
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syn_keys, syn_rows, scores = self.vectors.most_similar(toss, batch_size=batch_size)
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remap = {}
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for i, key in enumerate(keys[nr_row:]):
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self.vectors.add(key, row=syn_rows[i])
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word = self.strings[key]
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synonym = self.strings[syn_keys[i]]
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score = scores[i]
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remap[word] = (synonym, score)
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link_vectors_to_models(self)
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return remap
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def get_vector(self, orth, minn=None, maxn=None):
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"""Retrieve a vector for a word in the vocabulary. Words can be looked
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up by string or int ID. If no vectors data is loaded, ValueError is
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raised.
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RETURNS (numpy.ndarray): A word vector. Size
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and shape determined by the `vocab.vectors` instance. Usually, a
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numpy ndarray of shape (300,) and dtype float32.
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"""
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if isinstance(orth, basestring_):
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orth = self.strings.add(orth)
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word = self[orth].orth_
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if orth in self.vectors.key2row:
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return self.vectors[orth]
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# Assign default ngram limits to minn and maxn which is the length of the word.
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if minn is None:
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minn = len(word)
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if maxn is None:
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maxn = len(word)
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vectors = numpy.zeros((self.vectors_length,), dtype='f')
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# Fasttext's ngram computation taken from https://github.com/facebookresearch/fastText
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ngrams_size = 0;
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for i in range(len(word)):
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ngram = ""
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if (word[i] and 0xC0) == 0x80:
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continue
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n = 1
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j = i
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while (j < len(word) and n <= maxn):
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if n > maxn:
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break
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ngram += word[j]
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j = j + 1
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while (j < len(word) and (word[j] and 0xC0) == 0x80):
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ngram += word[j]
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j = j + 1
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if (n >= minn and not (n == 1 and (i == 0 or j == len(word)))):
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if self.strings[ngram] in self.vectors.key2row:
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vectors = numpy.add(self.vectors[self.strings[ngram]],vectors)
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ngrams_size += 1
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n = n + 1
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if ngrams_size > 0:
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vectors = vectors * (1.0/ngrams_size)
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return vectors
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def set_vector(self, orth, vector):
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"""Set a vector for a word in the vocabulary. Words can be referenced
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by string or int ID.
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"""
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if isinstance(orth, basestring_):
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orth = self.strings.add(orth)
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if self.vectors.is_full and orth not in self.vectors:
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new_rows = max(100, int(self.vectors.shape[0]*1.3))
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if self.vectors.shape[1] == 0:
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width = vector.size
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else:
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width = self.vectors.shape[1]
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self.vectors.resize((new_rows, width))
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lex = self[orth] # Adds worse to vocab
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self.vectors.add(orth, vector=vector)
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self.vectors.add(orth, vector=vector)
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def has_vector(self, orth):
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"""Check whether a word has a vector. Returns False if no vectors have
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been loaded. Words can be looked up by string or int ID."""
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if isinstance(orth, basestring_):
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orth = self.strings.add(orth)
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return orth in self.vectors
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def to_disk(self, path, **exclude):
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"""Save the current state to a directory.
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path (unicode or Path): A path to a directory, which will be created if
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it doesn't exist. Paths may be either strings or Path-like objects.
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"""
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path = util.ensure_path(path)
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if not path.exists():
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path.mkdir()
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self.strings.to_disk(path / 'strings.json')
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with (path / 'lexemes.bin').open('wb') as file_:
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file_.write(self.lexemes_to_bytes())
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if self.vectors is not None:
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self.vectors.to_disk(path)
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def from_disk(self, path, **exclude):
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"""Loads state from a directory. Modifies the object in place and
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returns it.
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path (unicode or Path): A path to a directory. Paths may be either
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strings or `Path`-like objects.
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RETURNS (Vocab): The modified `Vocab` object.
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"""
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path = util.ensure_path(path)
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self.strings.from_disk(path / 'strings.json')
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with (path / 'lexemes.bin').open('rb') as file_:
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self.lexemes_from_bytes(file_.read())
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if self.vectors is not None:
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self.vectors.from_disk(path, exclude='strings.json')
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if self.vectors.name is not None:
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link_vectors_to_models(self)
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return self
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def to_bytes(self, **exclude):
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"""Serialize the current state to a binary string.
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**exclude: Named attributes to prevent from being serialized.
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RETURNS (bytes): The serialized form of the `Vocab` object.
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"""
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def deserialize_vectors():
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if self.vectors is None:
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return None
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else:
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return self.vectors.to_bytes()
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getters = OrderedDict((
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('strings', lambda: self.strings.to_bytes()),
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('lexemes', lambda: self.lexemes_to_bytes()),
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('vectors', deserialize_vectors)
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))
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return util.to_bytes(getters, exclude)
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def from_bytes(self, bytes_data, **exclude):
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"""Load state from a binary string.
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bytes_data (bytes): The data to load from.
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**exclude: Named attributes to prevent from being loaded.
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RETURNS (Vocab): The `Vocab` object.
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"""
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def serialize_vectors(b):
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if self.vectors is None:
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return None
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else:
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return self.vectors.from_bytes(b)
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setters = OrderedDict((
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('strings', lambda b: self.strings.from_bytes(b)),
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('lexemes', lambda b: self.lexemes_from_bytes(b)),
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('vectors', lambda b: serialize_vectors(b))
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))
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util.from_bytes(bytes_data, setters, exclude)
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if self.vectors.name is not None:
|
|
link_vectors_to_models(self)
|
|
return self
|
|
|
|
def lexemes_to_bytes(self):
|
|
cdef hash_t key
|
|
cdef size_t addr
|
|
cdef LexemeC* lexeme = NULL
|
|
cdef SerializedLexemeC lex_data
|
|
cdef int size = 0
|
|
for key, addr in self._by_orth.items():
|
|
if addr == 0:
|
|
continue
|
|
size += sizeof(lex_data.data)
|
|
byte_string = b'\0' * size
|
|
byte_ptr = <unsigned char*>byte_string
|
|
cdef int j
|
|
cdef int i = 0
|
|
for key, addr in self._by_orth.items():
|
|
if addr == 0:
|
|
continue
|
|
lexeme = <LexemeC*>addr
|
|
lex_data = Lexeme.c_to_bytes(lexeme)
|
|
for j in range(sizeof(lex_data.data)):
|
|
byte_ptr[i] = lex_data.data[j]
|
|
i += 1
|
|
return byte_string
|
|
|
|
def lexemes_from_bytes(self, bytes bytes_data):
|
|
"""Load the binary vocabulary data from the given string."""
|
|
cdef LexemeC* lexeme
|
|
cdef hash_t key
|
|
cdef unicode py_str
|
|
cdef int i = 0
|
|
cdef int j = 0
|
|
cdef SerializedLexemeC lex_data
|
|
chunk_size = sizeof(lex_data.data)
|
|
cdef void* ptr
|
|
cdef unsigned char* bytes_ptr = bytes_data
|
|
for i in range(0, len(bytes_data), chunk_size):
|
|
lexeme = <LexemeC*>self.mem.alloc(1, sizeof(LexemeC))
|
|
for j in range(sizeof(lex_data.data)):
|
|
lex_data.data[j] = bytes_ptr[i+j]
|
|
Lexeme.c_from_bytes(lexeme, lex_data)
|
|
|
|
ptr = self.strings._map.get(lexeme.orth)
|
|
if ptr == NULL:
|
|
continue
|
|
py_str = self.strings[lexeme.orth]
|
|
if self.strings[py_str] != lexeme.orth:
|
|
raise ValueError(Errors.E086.format(string=py_str,
|
|
orth_id=lexeme.orth,
|
|
hash_id=self.strings[py_str]))
|
|
self._by_orth.set(lexeme.orth, lexeme)
|
|
self.length += 1
|
|
|
|
def _reset_cache(self, keys, strings):
|
|
# I'm not sure this made sense. Disable it for now.
|
|
raise NotImplementedError
|
|
|
|
|
|
def pickle_vocab(vocab):
|
|
sstore = vocab.strings
|
|
vectors = vocab.vectors
|
|
morph = vocab.morphology
|
|
length = vocab.length
|
|
data_dir = vocab.data_dir
|
|
lex_attr_getters = srsly.pickle_dumps(vocab.lex_attr_getters)
|
|
lexemes_data = vocab.lexemes_to_bytes()
|
|
return (unpickle_vocab,
|
|
(sstore, vectors, morph, data_dir, lex_attr_getters, lexemes_data, length))
|
|
|
|
|
|
def unpickle_vocab(sstore, vectors, morphology, data_dir,
|
|
lex_attr_getters, bytes lexemes_data, int length):
|
|
cdef Vocab vocab = Vocab()
|
|
vocab.length = length
|
|
vocab.vectors = vectors
|
|
vocab.strings = sstore
|
|
vocab.morphology = morphology
|
|
vocab.data_dir = data_dir
|
|
vocab.lex_attr_getters = srsly.pickle_loads(lex_attr_getters)
|
|
vocab.lexemes_from_bytes(lexemes_data)
|
|
vocab.length = length
|
|
return vocab
|
|
|
|
|
|
copy_reg.pickle(Vocab, pickle_vocab, unpickle_vocab)
|