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417 lines
13 KiB
Cython
417 lines
13 KiB
Cython
from __future__ import unicode_literals
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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 ..structs cimport TokenC, Entity
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from thinc.typedefs cimport weight_t
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from ..gold cimport GoldParseC
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from ..gold cimport GoldParse
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from ..attrs cimport ENT_TYPE, ENT_IOB
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from .stateclass cimport StateClass
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from ._state cimport StateC
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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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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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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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@classmethod
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def get_actions(cls, **kwargs):
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actions = kwargs.get('actions',
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{
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MISSING: {'': True},
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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: {'': True}
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})
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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] = True
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moves = ('M', 'B', 'I', 'L', 'U')
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for raw_text, sents in kwargs.get('gold_parses', []):
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for (ids, words, tags, heads, labels, biluo), _ in sents:
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for i, ner_tag in enumerate(biluo):
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if ner_tag != 'O' and ner_tag != '-':
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if ner_tag.count('-') != 1:
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raise ValueError(ner_tag)
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_, label = ner_tag.split('-')
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for move_str in ('B', 'I', 'L', 'U'):
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actions[moves.index(move_str)][label] = True
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return actions
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property action_types:
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def __get__(self):
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return (BEGIN, IN, LAST, UNIT, OUT)
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def move_name(self, int move, int 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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cdef int preprocess_gold(self, GoldParse gold) except -1:
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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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# Count frequencies, for use in encoder
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if gold.c.ner[i].move in (BEGIN, UNIT):
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self.freqs[ENT_IOB][3] += 1
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self.freqs[ENT_TYPE][gold.c.ner[i].label] += 1
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elif gold.c.ner[i].move in (IN, LAST):
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self.freqs[ENT_IOB][2] += 1
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self.freqs[ENT_TYPE][0] += 1
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elif gold.c.ner[i].move == OUT:
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self.freqs[ENT_IOB][1] += 1
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self.freqs[ENT_TYPE][0] += 1
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else:
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self.freqs[ENT_IOB][1] += 1
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self.freqs[ENT_TYPE][0] += 1
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cdef Transition lookup_transition(self, object name) except *:
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if name == '-':
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move_str = 'M'
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label = 0
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elif '-' in name:
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move_str, label_str = name.split('-', 1)
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label = self.strings[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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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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else:
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raise KeyError(name)
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cdef Transition init_transition(self, int clas, int move, int 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 Exception(move)
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return t
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cdef int initialize_state(self, StateC* st) nogil:
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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, int label) nogil:
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return False
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@staticmethod
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cdef int transition(StateC* s, int 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, int 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, int label) nogil:
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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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cdef int preset_ent_iob = st.B_(0).ent_iob
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if preset_ent_iob == 1:
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return False
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elif preset_ent_iob == 2:
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return False
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elif preset_ent_iob == 3 and st.B_(0).ent_type != label:
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return False
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# If the next word is B or O, we can't B now
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elif st.B_(1).ent_iob == 2 or st.B_(1).ent_iob == 3:
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return False
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# If the current word is B, and the next word isn't I, the current word
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# is really U
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elif preset_ent_iob == 3 and st.B_(1).ent_iob != 1:
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return False
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# Don't allow entities to extend across sentence boundaries
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elif st.B_(1).sent_start:
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return False
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else:
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return label != 0 and not st.entity_is_open()
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@staticmethod
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cdef int transition(StateC* st, int 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, int label) nogil:
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cdef int g_act = gold.ner[s.B(0)].move
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cdef int 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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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, int label) nogil:
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cdef int preset_ent_iob = st.B_(0).ent_iob
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if preset_ent_iob == 2:
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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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# TODO: Is this quite right?
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# I think it's supposed to be ensuring the gazetteer matches are maintained
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elif st.B_(1).ent_iob != preset_ent_iob:
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return False
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# Don't allow entities to extend across sentence boundaries
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elif st.B_(1).sent_start:
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return False
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return st.entity_is_open() and label != 0 and st.E_(0).ent_type == label
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@staticmethod
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cdef int transition(StateC* st, int 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, int 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(0) < s.c.length else OUT
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cdef int g_act = gold.ner[s.B(0)].move
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cdef int 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 (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 (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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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, int label) nogil:
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if st.B_(1).ent_iob == 1:
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return False
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return st.entity_is_open() and label != 0 and st.E_(0).ent_type == label
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@staticmethod
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cdef int transition(StateC* st, int 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, int 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 int 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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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, int label) nogil:
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cdef int preset_ent_iob = st.B_(0).ent_iob
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if preset_ent_iob == 2:
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return False
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elif preset_ent_iob == 1:
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return False
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elif preset_ent_iob == 3 and st.B_(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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return False
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return label != 0 and not st.entity_is_open()
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@staticmethod
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cdef int transition(StateC* st, int 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, int label) nogil:
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cdef int g_act = gold.ner[s.B(0)].move
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cdef int 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 == UNIT:
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# U, Gold U --> True iff tag match
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return label != g_tag
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else:
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# U, Gold B --> False
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# U, Gold I --> False
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# U, Gold L --> False
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# U, Gold O --> False
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return 1
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cdef class Out:
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@staticmethod
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cdef bint is_valid(const StateC* st, int label) nogil:
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cdef int preset_ent_iob = st.B_(0).ent_iob
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if preset_ent_iob == 3:
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return False
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elif preset_ent_iob == 1:
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return False
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return not st.entity_is_open()
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@staticmethod
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cdef int transition(StateC* st, int label) nogil:
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st.set_ent_tag(st.B(0), 2, 0)
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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, int label) nogil:
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cdef int g_act = gold.ner[s.B(0)].move
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cdef int 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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# O, Gold B --> False
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return 1
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elif g_act == IN:
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# O, Gold I --> True
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return 0
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elif g_act == LAST:
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# O, Gold L --> True
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return 0
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elif g_act == OUT:
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# O, Gold O --> True
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return 0
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elif g_act == UNIT:
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# O, Gold U --> False
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return 1
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else:
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return 1
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class OracleError(Exception):
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pass
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class UnknownMove(Exception):
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pass
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