mirror of https://github.com/explosion/spaCy.git
131 lines
4.2 KiB
Cython
131 lines
4.2 KiB
Cython
# cython: profile=True
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from .lexeme cimport *
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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 class Tokens:
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"""A sequence of references to Lexeme objects.
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The Tokens class provides fast and memory-efficient access to lexical features,
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and can efficiently export the data to a numpy array. Specific languages
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create their own Tokens subclasses, to provide more convenient access to
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language-specific features.
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>>> from spacy.en import EN
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>>> tokens = EN.tokenize('An example sentence.')
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>>> tokens.string(0)
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'An'
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>>> tokens.prob(0) > tokens.prob(1)
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True
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>>> tokens.can_noun(0)
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False
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>>> tokens.can_noun(1)
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True
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"""
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def __init__(self, StringStore string_store, string_length=0):
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self._string_store = string_store
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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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self._lex_ptr = <Lexeme**>self.mem.alloc(size + (PADDING*2), sizeof(Lexeme*))
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self._idx_ptr = <int*>self.mem.alloc(size + (PADDING*2), sizeof(int))
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self._pos_ptr = <int*>self.mem.alloc(size + (PADDING*2), sizeof(int))
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self.lex = self._lex_ptr
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self.idx = self._idx_ptr
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self.pos = self._pos_ptr
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cdef int i
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for i in range(size + (PADDING*2)):
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self.lex[i] = &EMPTY_LEXEME
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self.lex += PADDING
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self.idx += PADDING
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self.pos += PADDING
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self.max_length = size
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self.length = 0
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def __getitem__(self, i):
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bounds_check(i, self.length, PADDING)
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return Token(self._string_store, i, self.idx[i], self.pos[i], self.lex[i][0])
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def __len__(self):
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return self.length
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cdef int push_back(self, int idx, Lexeme* lexeme) 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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self.lex[self.length] = lexeme
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self.idx[self.length] = idx
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self.pos[self.length] = 0
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self.length += 1
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return idx + lexeme.length
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cdef int extend(self, int idx, Lexeme** lexemes, int n) except -1:
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cdef int i
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if lexemes == NULL:
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return idx
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elif n == 0:
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i = 0
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while lexemes[i] != NULL:
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idx = self.push_back(idx, lexemes[i])
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i += 1
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else:
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for i in range(n):
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idx = self.push_back(idx, lexemes[i])
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return idx
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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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self._lex_ptr = <Lexeme**>self.mem.realloc(self._lex_ptr, n * sizeof(Lexeme*))
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self._idx_ptr = <int*>self.mem.realloc(self._idx_ptr, n * sizeof(int))
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self._pos_ptr = <int*>self.mem.realloc(self._pos_ptr, n * sizeof(int))
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self.lex = self._lex_ptr + PADDING
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self.idx = self._idx_ptr + PADDING
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self.pos = self._pos_ptr + PADDING
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for i in range(self.length, self.max_length + PADDING):
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self.lex[i] = &EMPTY_LEXEME
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@cython.freelist(64)
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cdef class Token:
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def __init__(self, StringStore string_store, int i, int idx, int pos, dict lex):
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self._string_store = string_store
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self.idx = idx
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self.pos = pos
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self.i = i
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self.id = lex['id']
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self.cluster = lex['cluster']
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self.length = lex['length']
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self.postype = lex['postype']
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self.sensetype = lex['supersense']
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self.sic = lex['sic']
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self.norm = lex['norm']
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self.shape = lex['shape']
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self.vocab10k = lex['vocab10k']
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self.suffix = lex['asciied']
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self.prefix = lex['prefix']
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self.prob = lex['prob']
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self.flags = lex['flags']
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property string:
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def __get__(self):
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if self.sic == 0:
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return ''
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cdef bytes utf8string = self._string_store[self.sic]
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return utf8string.decode('utf8')
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