mirror of https://github.com/explosion/spaCy.git
502 lines
17 KiB
Cython
502 lines
17 KiB
Cython
# cython: profile=True
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# cython: cdivision=True
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# cython: infer_types=True
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from __future__ import unicode_literals
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from cpython.ref cimport PyObject, Py_INCREF, Py_XDECREF
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import ctypes
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import os
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from ..structs cimport TokenC
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from .transition_system cimport do_func_t, get_cost_func_t
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from .transition_system cimport move_cost_func_t, label_cost_func_t
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from ..gold cimport GoldParse
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from ..gold cimport GoldParseC
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from ..attrs cimport TAG, HEAD, DEP, ENT_IOB, ENT_TYPE, IS_SPACE
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from ..lexeme cimport Lexeme
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from libc.stdint cimport uint32_t
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from libc.string cimport memcpy
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from cymem.cymem cimport Pool
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from .stateclass cimport StateClass
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from ._state cimport StateC, is_space_token
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from .nonproj import PseudoProjectivity
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from .nonproj import is_nonproj_tree
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DEF NON_MONOTONIC = True
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DEF USE_BREAK = True
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cdef weight_t MIN_SCORE = -90000
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# Break transition from here
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# http://www.aclweb.org/anthology/P13-1074
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cdef enum:
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SHIFT
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REDUCE
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LEFT
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RIGHT
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BREAK
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N_MOVES
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MOVE_NAMES = [None] * N_MOVES
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MOVE_NAMES[SHIFT] = 'S'
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MOVE_NAMES[REDUCE] = 'D'
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MOVE_NAMES[LEFT] = 'L'
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MOVE_NAMES[RIGHT] = 'R'
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MOVE_NAMES[BREAK] = 'B'
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# Helper functions for the arc-eager oracle
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cdef weight_t push_cost(StateClass stcls, const GoldParseC* gold, int target) nogil:
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cdef weight_t cost = 0
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cdef int i, S_i
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for i in range(stcls.stack_depth()):
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S_i = stcls.S(i)
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if gold.heads[target] == S_i:
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cost += 1
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if gold.heads[S_i] == target and (NON_MONOTONIC or not stcls.has_head(S_i)):
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cost += 1
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cost += Break.is_valid(stcls.c, -1) and Break.move_cost(stcls, gold) == 0
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return cost
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cdef weight_t pop_cost(StateClass stcls, const GoldParseC* gold, int target) nogil:
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cdef weight_t cost = 0
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cdef int i, B_i
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for i in range(stcls.buffer_length()):
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B_i = stcls.B(i)
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cost += gold.heads[B_i] == target
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cost += gold.heads[target] == B_i
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if gold.heads[B_i] == B_i or gold.heads[B_i] < target:
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break
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if Break.is_valid(stcls.c, -1) and Break.move_cost(stcls, gold) == 0:
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cost += 1
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return cost
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cdef weight_t arc_cost(StateClass stcls, const GoldParseC* gold, int head, int child) nogil:
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if arc_is_gold(gold, head, child):
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return 0
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elif stcls.H(child) == gold.heads[child]:
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return 1
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# Head in buffer
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elif gold.heads[child] >= stcls.B(0) and stcls.B(1) != -1:
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return 1
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else:
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return 0
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cdef bint arc_is_gold(const GoldParseC* gold, int head, int child) nogil:
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if gold.labels[child] == -1:
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return True
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elif gold.heads[child] == head:
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return True
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else:
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return False
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cdef bint label_is_gold(const GoldParseC* gold, int head, int child, int label) nogil:
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if gold.labels[child] == -1:
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return True
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elif label == -1:
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return True
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elif gold.labels[child] == label:
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return True
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else:
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return False
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cdef bint _is_gold_root(const GoldParseC* gold, int word) nogil:
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return gold.labels[word] == -1 or gold.heads[word] == word
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cdef class Shift:
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@staticmethod
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cdef bint is_valid(const StateC* st, int label) nogil:
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return st.buffer_length() >= 2 and not st.shifted[st.B(0)] and not st.B_(0).sent_start
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@staticmethod
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cdef int transition(StateC* st, int label) nogil:
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st.push()
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st.fast_forward()
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@staticmethod
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cdef weight_t cost(StateClass st, const GoldParseC* gold, int label) nogil:
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return Shift.move_cost(st, gold) + Shift.label_cost(st, gold, label)
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@staticmethod
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cdef inline weight_t move_cost(StateClass s, const GoldParseC* gold) nogil:
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return push_cost(s, gold, s.B(0))
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@staticmethod
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cdef inline weight_t label_cost(StateClass s, const GoldParseC* gold, int label) nogil:
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return 0
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cdef class Reduce:
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@staticmethod
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cdef bint is_valid(const StateC* st, int label) nogil:
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return st.stack_depth() >= 2
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@staticmethod
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cdef int transition(StateC* st, int label) nogil:
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if st.has_head(st.S(0)):
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st.pop()
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else:
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st.unshift()
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st.fast_forward()
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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 Reduce.move_cost(s, gold) + Reduce.label_cost(s, gold, label)
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@staticmethod
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cdef inline weight_t move_cost(StateClass st, const GoldParseC* gold) nogil:
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cost = pop_cost(st, gold, st.S(0))
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if not st.has_head(st.S(0)):
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# Decrement cost for the arcs e save
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for i in range(1, st.stack_depth()):
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S_i = st.S(i)
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if gold.heads[st.S(0)] == S_i:
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cost -= 1
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if gold.heads[S_i] == st.S(0):
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cost -= 1
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if Break.is_valid(st.c, -1) and Break.move_cost(st, gold) == 0:
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cost -= 1
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return cost
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@staticmethod
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cdef inline weight_t label_cost(StateClass s, const GoldParseC* gold, int label) nogil:
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return 0
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cdef class LeftArc:
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@staticmethod
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cdef bint is_valid(const StateC* st, int label) nogil:
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return not st.B_(0).sent_start
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@staticmethod
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cdef int transition(StateC* st, int label) nogil:
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st.add_arc(st.B(0), st.S(0), label)
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st.pop()
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st.fast_forward()
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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 LeftArc.move_cost(s, gold) + LeftArc.label_cost(s, gold, label)
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@staticmethod
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cdef inline weight_t move_cost(StateClass s, const GoldParseC* gold) nogil:
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cdef weight_t cost = 0
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if arc_is_gold(gold, s.B(0), s.S(0)):
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# Have a negative cost if we 'recover' from the wrong dependency
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return 0 if not s.has_head(s.S(0)) else -1
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else:
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# Account for deps we might lose between S0 and stack
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if not s.has_head(s.S(0)):
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for i in range(1, s.stack_depth()):
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cost += gold.heads[s.S(i)] == s.S(0)
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cost += gold.heads[s.S(0)] == s.S(i)
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return cost + pop_cost(s, gold, s.S(0)) + arc_cost(s, gold, s.B(0), s.S(0))
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@staticmethod
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cdef inline weight_t label_cost(StateClass s, const GoldParseC* gold, int label) nogil:
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return arc_is_gold(gold, s.B(0), s.S(0)) and not label_is_gold(gold, s.B(0), s.S(0), label)
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cdef class RightArc:
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@staticmethod
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cdef bint is_valid(const StateC* st, int label) nogil:
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return not st.B_(0).sent_start
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@staticmethod
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cdef int transition(StateC* st, int label) nogil:
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st.add_arc(st.S(0), st.B(0), label)
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st.push()
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st.fast_forward()
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@staticmethod
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cdef inline weight_t cost(StateClass s, const GoldParseC* gold, int label) nogil:
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return RightArc.move_cost(s, gold) + RightArc.label_cost(s, gold, label)
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@staticmethod
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cdef inline weight_t move_cost(StateClass s, const GoldParseC* gold) nogil:
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if arc_is_gold(gold, s.S(0), s.B(0)):
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return 0
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elif s.c.shifted[s.B(0)]:
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return push_cost(s, gold, s.B(0))
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else:
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return push_cost(s, gold, s.B(0)) + arc_cost(s, gold, s.S(0), s.B(0))
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@staticmethod
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cdef weight_t label_cost(StateClass s, const GoldParseC* gold, int label) nogil:
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return arc_is_gold(gold, s.S(0), s.B(0)) and not label_is_gold(gold, s.S(0), s.B(0), label)
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cdef class Break:
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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 i
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if not USE_BREAK:
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return False
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elif st.at_break():
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return False
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elif st.stack_depth() < 1:
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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, int label) nogil:
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st.set_break(st.B_(0).l_edge)
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st.fast_forward()
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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 Break.move_cost(s, gold) + Break.label_cost(s, gold, label)
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@staticmethod
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cdef inline weight_t move_cost(StateClass s, const GoldParseC* gold) nogil:
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cdef weight_t cost = 0
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cdef int i, j, S_i, B_i
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for i in range(s.stack_depth()):
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S_i = s.S(i)
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for j in range(s.buffer_length()):
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B_i = s.B(j)
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cost += gold.heads[S_i] == B_i
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cost += gold.heads[B_i] == S_i
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if cost != 0:
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return cost
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# Check for sentence boundary --- if it's here, we can't have any deps
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# between stack and buffer, so rest of action is irrelevant.
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s0_root = _get_root(s.S(0), gold)
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b0_root = _get_root(s.B(0), gold)
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if s0_root != b0_root or s0_root == -1 or b0_root == -1:
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return cost
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else:
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return cost + 1
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@staticmethod
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cdef inline weight_t label_cost(StateClass s, const GoldParseC* gold, int label) nogil:
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return 0
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cdef int _get_root(int word, const GoldParseC* gold) nogil:
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while gold.heads[word] != word and gold.labels[word] != -1 and word >= 0:
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word = gold.heads[word]
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if gold.labels[word] == -1:
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return -1
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else:
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return word
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cdef void* _init_state(Pool mem, int length, void* tokens) except NULL:
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cdef StateClass st = StateClass.init(<const TokenC*>tokens, length)
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# Ensure sent_start is set to 0 throughout
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for i in range(st.c.length):
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st.c._sent[i].sent_start = False
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st.c._sent[i].l_edge = i
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st.c._sent[i].r_edge = i
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st.fast_forward()
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Py_INCREF(st)
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return <void*>st
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cdef class ArcEager(TransitionSystem):
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def __init__(self, *args, **kwargs):
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TransitionSystem.__init__(self, *args, **kwargs)
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self.init_beam_state = _init_state
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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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SHIFT: {'': True},
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REDUCE: {'': True},
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RIGHT: {},
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LEFT: {},
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BREAK: {'ROOT': True}})
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for label in kwargs.get('left_labels', []):
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if label.upper() != 'ROOT':
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actions[LEFT][label] = True
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for label in kwargs.get('right_labels', []):
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if label.upper() != 'ROOT':
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actions[RIGHT][label] = True
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for raw_text, sents in kwargs.get('gold_parses', []):
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for (ids, words, tags, heads, labels, iob), ctnts in sents:
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for child, head, label in zip(ids, heads, labels):
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if label.upper() == 'ROOT':
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label = 'ROOT'
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if label != 'ROOT':
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if head < child:
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actions[RIGHT][label] = True
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elif head > child:
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actions[LEFT][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 (SHIFT, REDUCE, LEFT, RIGHT, BREAK)
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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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if gold.heads[i] is None: # Missing values
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gold.c.heads[i] = i
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gold.c.labels[i] = -1
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else:
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label = gold.labels[i]
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if label.upper() == 'ROOT':
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label = 'ROOT'
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gold.c.heads[i] = gold.heads[i]
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gold.c.labels[i] = self.strings[label]
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# Count frequencies, for use in encoder
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self.freqs[HEAD][gold.c.heads[i] - i] += 1
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self.freqs[DEP][gold.c.labels[i]] += 1
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cdef Transition lookup_transition(self, object name) except *:
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if '-' 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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def move_name(self, int move, int label):
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label_str = self.strings[label]
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if label_str:
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return MOVE_NAMES[move] + '-' + label_str
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else:
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return MOVE_NAMES[move]
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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 == SHIFT:
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t.is_valid = Shift.is_valid
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t.do = Shift.transition
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t.get_cost = Shift.cost
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elif move == REDUCE:
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t.is_valid = Reduce.is_valid
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t.do = Reduce.transition
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t.get_cost = Reduce.cost
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elif move == LEFT:
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t.is_valid = LeftArc.is_valid
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t.do = LeftArc.transition
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t.get_cost = LeftArc.cost
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elif move == RIGHT:
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t.is_valid = RightArc.is_valid
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t.do = RightArc.transition
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t.get_cost = RightArc.cost
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elif move == BREAK:
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t.is_valid = Break.is_valid
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t.do = Break.transition
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t.get_cost = Break.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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# Ensure sent_start is set to 0 throughout
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for i in range(st.length):
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st._sent[i].sent_start = False
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st._sent[i].l_edge = i
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st._sent[i].r_edge = i
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st.fast_forward()
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cdef int finalize_state(self, StateC* st) nogil:
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cdef int i
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for i in range(st.length):
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if st._sent[i].head == 0 and st._sent[i].dep == 0:
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st._sent[i].dep = self.root_label
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def finalize_doc(self, doc):
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doc.is_parsed = True
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cdef int set_valid(self, int* output, const StateC* st) nogil:
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cdef bint[N_MOVES] is_valid
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is_valid[SHIFT] = Shift.is_valid(st, -1)
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is_valid[REDUCE] = Reduce.is_valid(st, -1)
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is_valid[LEFT] = LeftArc.is_valid(st, -1)
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is_valid[RIGHT] = RightArc.is_valid(st, -1)
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is_valid[BREAK] = Break.is_valid(st, -1)
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cdef int i
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for i in range(self.n_moves):
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output[i] = is_valid[self.c[i].move]
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cdef int set_costs(self, int* is_valid, weight_t* costs,
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StateClass stcls, GoldParse gold) except -1:
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cdef int i, move, label
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cdef label_cost_func_t[N_MOVES] label_cost_funcs
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cdef move_cost_func_t[N_MOVES] move_cost_funcs
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cdef weight_t[N_MOVES] move_costs
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for i in range(N_MOVES):
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move_costs[i] = 9000
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move_cost_funcs[SHIFT] = Shift.move_cost
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move_cost_funcs[REDUCE] = Reduce.move_cost
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move_cost_funcs[LEFT] = LeftArc.move_cost
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move_cost_funcs[RIGHT] = RightArc.move_cost
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move_cost_funcs[BREAK] = Break.move_cost
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label_cost_funcs[SHIFT] = Shift.label_cost
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label_cost_funcs[REDUCE] = Reduce.label_cost
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label_cost_funcs[LEFT] = LeftArc.label_cost
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label_cost_funcs[RIGHT] = RightArc.label_cost
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label_cost_funcs[BREAK] = Break.label_cost
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cdef int* labels = gold.c.labels
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cdef int* heads = gold.c.heads
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n_gold = 0
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for i in range(self.n_moves):
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if self.c[i].is_valid(stcls.c, self.c[i].label):
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is_valid[i] = True
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move = self.c[i].move
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label = self.c[i].label
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if move_costs[move] == 9000:
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move_costs[move] = move_cost_funcs[move](stcls, &gold.c)
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costs[i] = move_costs[move] + label_cost_funcs[move](stcls, &gold.c, label)
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n_gold += costs[i] <= 0
|
|
else:
|
|
is_valid[i] = False
|
|
costs[i] = 9000
|
|
if n_gold < 1:
|
|
# Check projectivity --- leading cause
|
|
if is_nonproj_tree(gold.heads):
|
|
raise ValueError(
|
|
"Could not find a gold-standard action to supervise the dependency "
|
|
"parser.\n"
|
|
"Likely cause: the tree is non-projective (i.e. it has crossing "
|
|
"arcs -- see spacy/syntax/nonproj.pyx for definitions)\n"
|
|
"The ArcEager transition system only supports projective trees.\n"
|
|
"To learn non-projective representations, transform the data "
|
|
"before training and after parsing. Either pass make_projective=True "
|
|
"to the GoldParse class, or use PseudoProjectivity.preprocess_training_data")
|
|
else:
|
|
print(gold.words)
|
|
print(gold.heads)
|
|
print(gold.labels)
|
|
raise ValueError(
|
|
"Could not find a gold-standard action to supervise the dependency "
|
|
"parser.\n"
|
|
"The GoldParse was projective.\n"
|
|
"The transition system has %d actions.\n"
|
|
"State at failure:\n"
|
|
"%s" % (self.n_moves, stcls.print_state(gold.words)))
|
|
assert n_gold >= 1
|