mirror of https://github.com/explosion/spaCy.git
566 lines
18 KiB
Cython
566 lines
18 KiB
Cython
# coding: utf-8
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from __future__ import unicode_literals
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from thinc.typedefs cimport weight_t
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from thinc.extra.search cimport Beam
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from collections import OrderedDict, Counter
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from .stateclass cimport StateClass
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from ._state cimport StateC
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from .transition_system cimport Transition
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from .transition_system cimport do_func_t
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from ..gold cimport GoldParseC, GoldParse
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from ..lexeme cimport Lexeme
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from ..attrs cimport IS_SPACE
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from ..errors import Errors
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cdef enum:
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MISSING
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BEGIN
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IN
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LAST
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UNIT
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OUT
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ISNT
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N_MOVES
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MOVE_NAMES = [None] * N_MOVES
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MOVE_NAMES[MISSING] = 'M'
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MOVE_NAMES[BEGIN] = 'B'
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MOVE_NAMES[IN] = 'I'
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MOVE_NAMES[LAST] = 'L'
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MOVE_NAMES[UNIT] = 'U'
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MOVE_NAMES[OUT] = 'O'
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MOVE_NAMES[ISNT] = 'x'
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cdef do_func_t[N_MOVES] do_funcs
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cdef bint _entity_is_sunk(StateClass st, Transition* golds) nogil:
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if not st.entity_is_open():
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return False
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cdef const Transition* gold = &golds[st.E(0)]
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if gold.move != BEGIN and gold.move != UNIT:
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return True
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elif gold.label != st.E_(0).ent_type:
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return True
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else:
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return False
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cdef class BiluoPushDown(TransitionSystem):
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def __init__(self, *args, **kwargs):
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TransitionSystem.__init__(self, *args, **kwargs)
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@classmethod
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def get_actions(cls, **kwargs):
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actions = {
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MISSING: Counter(),
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BEGIN: Counter(),
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IN: Counter(),
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LAST: Counter(),
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UNIT: Counter(),
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OUT: Counter()
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}
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actions[OUT][''] = 1 # Represents a token predicted to be outside of any entity
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actions[UNIT][''] = 1 # Represents a token prohibited to be in an entity
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for entity_type in kwargs.get('entity_types', []):
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for action in (BEGIN, IN, LAST, UNIT):
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actions[action][entity_type] = 1
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moves = ('M', 'B', 'I', 'L', 'U')
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for example in kwargs.get('gold_parses', []):
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for i, ner_tag in enumerate(example.token_annotation.entities):
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if ner_tag != 'O' and ner_tag != '-':
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_, label = ner_tag.split('-', 1)
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for action in (BEGIN, IN, LAST, UNIT):
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actions[action][label] += 1
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return actions
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@property
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def action_types(self):
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return (BEGIN, IN, LAST, UNIT, OUT)
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def move_name(self, int move, attr_t label):
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if move == OUT:
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return 'O'
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elif move == MISSING:
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return 'M'
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else:
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return MOVE_NAMES[move] + '-' + self.strings[label]
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def has_gold(self, GoldParse gold, start=0, end=None):
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end = end or len(gold.ner)
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if all([tag in ('-', None) for tag in gold.ner[start:end]]):
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return False
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else:
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return True
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def preprocess_gold(self, GoldParse gold):
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if not self.has_gold(gold):
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return None
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for i in range(gold.length):
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gold.c.ner[i] = self.lookup_transition(gold.ner[i])
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return gold
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def get_beam_annot(self, Beam beam):
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entities = {}
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probs = beam.probs
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for i in range(beam.size):
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state = <StateC*>beam.at(i)
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if state.is_final():
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self.finalize_state(state)
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prob = probs[i]
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for j in range(state._e_i):
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start = state._ents[j].start
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end = state._ents[j].end
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label = state._ents[j].label
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entities.setdefault((start, end, label), 0.0)
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entities[(start, end, label)] += prob
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return entities
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def get_beam_parses(self, Beam beam):
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parses = []
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probs = beam.probs
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for i in range(beam.size):
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state = <StateC*>beam.at(i)
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if state.is_final():
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self.finalize_state(state)
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prob = probs[i]
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parse = []
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for j in range(state._e_i):
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start = state._ents[j].start
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end = state._ents[j].end
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label = state._ents[j].label
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parse.append((start, end, self.strings[label]))
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parses.append((prob, parse))
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return parses
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cdef Transition lookup_transition(self, object name) except *:
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cdef attr_t label
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if name == '-' or name == '' or name is None:
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return Transition(clas=0, move=MISSING, label=0, score=0)
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elif name == '!O':
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return Transition(clas=0, move=ISNT, label=0, score=0)
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elif '-' in name:
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move_str, label_str = name.split('-', 1)
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# Hacky way to denote 'not this entity'
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if label_str.startswith('!'):
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label_str = label_str[1:]
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move_str = 'x'
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label = self.strings.add(label_str)
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else:
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move_str = name
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label = 0
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move = MOVE_NAMES.index(move_str)
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if move == ISNT:
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return Transition(clas=0, move=ISNT, label=label, score=0)
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for i in range(self.n_moves):
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if self.c[i].move == move and self.c[i].label == label:
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return self.c[i]
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raise KeyError(Errors.E022.format(name=name))
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cdef Transition init_transition(self, int clas, int move, attr_t label) except *:
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# TODO: Apparent Cython bug here when we try to use the Transition()
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# constructor with the function pointers
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cdef Transition t
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t.score = 0
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t.clas = clas
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t.move = move
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t.label = label
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if move == MISSING:
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t.is_valid = Missing.is_valid
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t.do = Missing.transition
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t.get_cost = Missing.cost
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elif move == BEGIN:
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t.is_valid = Begin.is_valid
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t.do = Begin.transition
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t.get_cost = Begin.cost
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elif move == IN:
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t.is_valid = In.is_valid
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t.do = In.transition
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t.get_cost = In.cost
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elif move == LAST:
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t.is_valid = Last.is_valid
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t.do = Last.transition
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t.get_cost = Last.cost
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elif move == UNIT:
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t.is_valid = Unit.is_valid
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t.do = Unit.transition
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t.get_cost = Unit.cost
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elif move == OUT:
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t.is_valid = Out.is_valid
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t.do = Out.transition
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t.get_cost = Out.cost
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else:
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raise ValueError(Errors.E019.format(action=move, src='ner'))
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return t
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def add_action(self, int action, label_name, freq=None):
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cdef attr_t label_id
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if not isinstance(label_name, (int, long)):
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label_id = self.strings.add(label_name)
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else:
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label_id = label_name
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if action == OUT and label_id != 0:
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return None
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if action == MISSING or action == ISNT:
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return None
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# Check we're not creating a move we already have, so that this is
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# idempotent
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for trans in self.c[:self.n_moves]:
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if trans.move == action and trans.label == label_id:
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return 0
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if self.n_moves >= self._size:
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self._size = self.n_moves
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self._size *= 2
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self.c = <Transition*>self.mem.realloc(self.c, self._size * sizeof(self.c[0]))
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self.c[self.n_moves] = self.init_transition(self.n_moves, action, label_id)
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self.n_moves += 1
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if self.labels.get(action, []):
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freq = min(0, min(self.labels[action].values()))
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self.labels[action][label_name] = freq-1
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else:
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self.labels[action] = Counter()
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self.labels[action][label_name] = -1
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return 1
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cdef int initialize_state(self, StateC* st) nogil:
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# This is especially necessary when we use limited training data.
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for i in range(st.length):
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if st._sent[i].ent_type != 0:
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with gil:
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self.add_action(BEGIN, st._sent[i].ent_type)
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self.add_action(IN, st._sent[i].ent_type)
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self.add_action(UNIT, st._sent[i].ent_type)
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self.add_action(LAST, st._sent[i].ent_type)
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cdef class Missing:
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@staticmethod
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cdef bint is_valid(const StateC* st, attr_t label) nogil:
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return False
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@staticmethod
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cdef int transition(StateC* s, attr_t label) nogil:
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pass
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@staticmethod
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cdef weight_t cost(StateClass s, const GoldParseC* gold, attr_t label) nogil:
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return 9000
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cdef class Begin:
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@staticmethod
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cdef bint is_valid(const StateC* st, attr_t label) nogil:
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cdef int preset_ent_iob = st.B_(0).ent_iob
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cdef attr_t preset_ent_label = st.B_(0).ent_type
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# If we're the last token of the input, we can't B -- must U or O.
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if st.B(1) == -1:
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return False
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elif st.entity_is_open():
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return False
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elif label == 0:
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return False
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elif preset_ent_iob == 1:
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# Ensure we don't clobber preset entities. If no entity preset,
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# ent_iob is 0
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return False
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elif preset_ent_iob == 3:
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# Okay, we're in a preset entity.
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if label != preset_ent_label:
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# If label isn't right, reject
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return False
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elif st.B_(1).ent_iob != 1:
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# If next token isn't marked I, we need to make U, not B.
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return False
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else:
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# Otherwise, force acceptance, even if we're across a sentence
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# boundary or the token is whitespace.
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return True
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elif st.B_(1).ent_iob == 3:
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# If the next word is B, we can't B now
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return False
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elif st.B_(1).sent_start == 1:
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# Don't allow entities to extend across sentence boundaries
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return False
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# Don't allow entities to start on whitespace
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elif Lexeme.get_struct_attr(st.B_(0).lex, IS_SPACE):
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return False
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else:
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return True
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@staticmethod
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cdef int transition(StateC* st, attr_t label) nogil:
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st.open_ent(label)
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st.set_ent_tag(st.B(0), 3, label)
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st.push()
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st.pop()
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@staticmethod
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cdef weight_t cost(StateClass s, const GoldParseC* gold, attr_t label) nogil:
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cdef int g_act = gold.ner[s.B(0)].move
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cdef attr_t g_tag = gold.ner[s.B(0)].label
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if g_act == MISSING:
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return 0
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elif g_act == BEGIN:
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# B, Gold B --> Label match
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return label != g_tag
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# Support partial supervision in the form of "not this label"
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elif g_act == ISNT:
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return label == g_tag
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else:
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# B, Gold I --> False (P)
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# B, Gold L --> False (P)
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# B, Gold O --> False (P)
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# B, Gold U --> False (P)
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return 1
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cdef class In:
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@staticmethod
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cdef bint is_valid(const StateC* st, attr_t label) nogil:
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cdef int preset_ent_iob = st.B_(0).ent_iob
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cdef attr_t preset_ent_label = st.B_(0).ent_type
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if label == 0:
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return False
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elif st.E_(0).ent_type != label:
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return False
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elif not st.entity_is_open():
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return False
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elif st.B(1) == -1:
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# If we're at the end, we can't I.
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return False
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elif preset_ent_iob == 3:
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return False
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elif st.B_(1).ent_iob == 3:
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# If we know the next word is B, we can't be I (must be L)
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return False
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elif preset_ent_iob == 1:
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if st.B_(1).ent_iob in (0, 2):
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# if next preset is missing or O, this can't be I (must be L)
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return False
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elif label != preset_ent_label:
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# If label isn't right, reject
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return False
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else:
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# Otherwise, force acceptance, even if we're across a sentence
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# boundary or the token is whitespace.
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return True
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elif st.B(1) != -1 and st.B_(1).sent_start == 1:
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# Don't allow entities to extend across sentence boundaries
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return False
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else:
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return True
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@staticmethod
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cdef int transition(StateC* st, attr_t label) nogil:
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st.set_ent_tag(st.B(0), 1, label)
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st.push()
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st.pop()
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@staticmethod
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cdef weight_t cost(StateClass s, const GoldParseC* gold, attr_t label) nogil:
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move = IN
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cdef int next_act = gold.ner[s.B(1)].move if s.B(1) >= 0 else OUT
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cdef int g_act = gold.ner[s.B(0)].move
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cdef attr_t g_tag = gold.ner[s.B(0)].label
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cdef bint is_sunk = _entity_is_sunk(s, gold.ner)
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if g_act == MISSING:
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return 0
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elif g_act == BEGIN:
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# I, Gold B --> True
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# (P of bad open entity sunk, R of this entity sunk)
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return 0
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elif g_act == IN:
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# I, Gold I --> True
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# (label forced by prev, if mismatch, P and R both sunk)
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return 0
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elif g_act == LAST:
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# I, Gold L --> True iff this entity sunk and next tag == O
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return not (is_sunk and (next_act == OUT or next_act == MISSING))
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elif g_act == OUT:
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# I, Gold O --> True iff next tag == O
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return not (next_act == OUT or next_act == MISSING)
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elif g_act == UNIT:
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# I, Gold U --> True iff next tag == O
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return next_act != OUT
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# Support partial supervision in the form of "not this label"
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elif g_act == ISNT:
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return 0
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else:
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return 1
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cdef class Last:
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@staticmethod
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cdef bint is_valid(const StateC* st, attr_t label) nogil:
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cdef int preset_ent_iob = st.B_(0).ent_iob
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cdef attr_t preset_ent_label = st.B_(0).ent_type
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if label == 0:
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return False
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elif not st.entity_is_open():
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return False
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elif preset_ent_iob == 1 and st.B_(1).ent_iob != 1:
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# If a preset entity has I followed by not-I, is L
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if label != preset_ent_label:
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# If label isn't right, reject
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return False
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else:
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# Otherwise, force acceptance, even if we're across a sentence
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# boundary or the token is whitespace.
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return True
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elif st.E_(0).ent_type != label:
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return False
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elif st.B_(1).ent_iob == 1:
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# If a preset entity has I next, we can't L here.
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return False
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else:
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return True
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@staticmethod
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cdef int transition(StateC* st, attr_t label) nogil:
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st.close_ent()
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st.set_ent_tag(st.B(0), 1, label)
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st.push()
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st.pop()
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@staticmethod
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cdef weight_t cost(StateClass s, const GoldParseC* gold, attr_t label) nogil:
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move = LAST
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cdef int g_act = gold.ner[s.B(0)].move
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cdef attr_t g_tag = gold.ner[s.B(0)].label
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if g_act == MISSING:
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return 0
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elif g_act == BEGIN:
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# L, Gold B --> True
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return 0
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elif g_act == IN:
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# L, Gold I --> True iff this entity sunk
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return not _entity_is_sunk(s, gold.ner)
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elif g_act == LAST:
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# L, Gold L --> True
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return 0
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elif g_act == OUT:
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# L, Gold O --> True
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return 0
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elif g_act == UNIT:
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# L, Gold U --> True
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return 0
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# Support partial supervision in the form of "not this label"
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elif g_act == ISNT:
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return 0
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else:
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return 1
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cdef class Unit:
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@staticmethod
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cdef bint is_valid(const StateC* st, attr_t label) nogil:
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cdef int preset_ent_iob = st.B_(0).ent_iob
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cdef attr_t preset_ent_label = st.B_(0).ent_type
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if label == 0:
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# this is only allowed if it's a preset blocked annotation
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if preset_ent_label == 0 and preset_ent_iob == 3:
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return True
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else:
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return False
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elif st.entity_is_open():
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return False
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elif st.B_(1).ent_iob == 1:
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# If next token is In, we can't be Unit -- must be Begin
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return False
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elif preset_ent_iob == 3:
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# Okay, there's a preset entity here
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if label != preset_ent_label:
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# Require labels to match
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return False
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else:
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# Otherwise return True, ignoring the whitespace constraint.
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return True
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elif Lexeme.get_struct_attr(st.B_(0).lex, IS_SPACE):
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return False
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else:
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return True
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@staticmethod
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cdef int transition(StateC* st, attr_t label) nogil:
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st.open_ent(label)
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st.close_ent()
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st.set_ent_tag(st.B(0), 3, label)
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st.push()
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st.pop()
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@staticmethod
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cdef weight_t cost(StateClass s, const GoldParseC* gold, attr_t label) nogil:
|
|
cdef int g_act = gold.ner[s.B(0)].move
|
|
cdef attr_t g_tag = gold.ner[s.B(0)].label
|
|
|
|
if g_act == MISSING:
|
|
return 0
|
|
elif g_act == UNIT:
|
|
# U, Gold U --> True iff tag match
|
|
return label != g_tag
|
|
# Support partial supervision in the form of "not this label"
|
|
elif g_act == ISNT:
|
|
return label == g_tag
|
|
else:
|
|
# U, Gold B --> False
|
|
# U, Gold I --> False
|
|
# U, Gold L --> False
|
|
# U, Gold O --> False
|
|
return 1
|
|
|
|
|
|
cdef class Out:
|
|
@staticmethod
|
|
cdef bint is_valid(const StateC* st, attr_t label) nogil:
|
|
cdef int preset_ent_iob = st.B_(0).ent_iob
|
|
if st.entity_is_open():
|
|
return False
|
|
elif preset_ent_iob == 3:
|
|
return False
|
|
elif preset_ent_iob == 1:
|
|
return False
|
|
else:
|
|
return True
|
|
|
|
@staticmethod
|
|
cdef int transition(StateC* st, attr_t label) nogil:
|
|
st.set_ent_tag(st.B(0), 2, 0)
|
|
st.push()
|
|
st.pop()
|
|
|
|
@staticmethod
|
|
cdef weight_t cost(StateClass s, const GoldParseC* gold, attr_t label) nogil:
|
|
cdef int g_act = gold.ner[s.B(0)].move
|
|
cdef attr_t g_tag = gold.ner[s.B(0)].label
|
|
|
|
if g_act == ISNT and g_tag == 0:
|
|
return 1
|
|
elif g_act == MISSING or g_act == ISNT:
|
|
return 0
|
|
elif g_act == BEGIN:
|
|
# O, Gold B --> False
|
|
return 1
|
|
elif g_act == IN:
|
|
# O, Gold I --> True
|
|
return 0
|
|
elif g_act == LAST:
|
|
# O, Gold L --> True
|
|
return 0
|
|
elif g_act == OUT:
|
|
# O, Gold O --> True
|
|
return 0
|
|
elif g_act == UNIT:
|
|
# O, Gold U --> False
|
|
return 1
|
|
else:
|
|
return 1
|