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448 lines
15 KiB
Cython
448 lines
15 KiB
Cython
# cython: profile=True
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from __future__ import unicode_literals
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import ctypes
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import os
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from ._state cimport State
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from ._state cimport has_head, get_idx, get_s0, get_n0, get_left, get_right
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from ._state cimport is_final, at_eol, pop_stack, push_stack, add_dep
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from ._state cimport head_in_buffer, children_in_buffer
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from ._state cimport head_in_stack, children_in_stack
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from ._state cimport count_left_kids
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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 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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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 int push_cost(StateClass stcls, const GoldParseC* gold, int target) except -1:
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cdef int 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, -1) and Break.move_cost(stcls, gold) == 0
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return cost
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cdef int pop_cost(StateClass stcls, const GoldParseC* gold, int target) except -1:
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cdef int 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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return cost
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cdef int arc_cost(StateClass stcls, const GoldParseC* gold, int head, int child) except -1:
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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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elif gold.heads[child] >= stcls.B(0):
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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) except -1:
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if gold.labels[child] == -1:
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return True
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elif _is_gold_root(gold, head) and _is_gold_root(gold, child):
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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) except -1:
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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) except -1:
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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(StateClass st, int label) except -1:
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return not st.eol()
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@staticmethod
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cdef int transition(State* state, int label) except -1:
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# Set the dep label, in case we need it after we reduce
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if NON_MONOTONIC:
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state.sent[state.i].dep = label
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push_stack(state)
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@staticmethod
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cdef int cost(StateClass st, const GoldParseC* gold, int label) except -1:
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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 int move_cost(StateClass s, const GoldParseC* gold) except -1:
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return push_cost(s, gold, s.B(0))
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@staticmethod
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cdef int label_cost(StateClass s, const GoldParseC* gold, int label) except -1:
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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(StateClass st, int label) except -1:
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if NON_MONOTONIC:
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return st.stack_depth() >= 2 #and not missing_brackets(s)
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else:
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return st.stack_depth() >= 2 and st.has_head(st.S(0))
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@staticmethod
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cdef int transition(State* state, int label) except -1:
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if NON_MONOTONIC and not has_head(get_s0(state)) and state.stack_len >= 2:
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add_dep(state, state.stack[-1], state.stack[0], get_s0(state).dep)
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pop_stack(state)
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@staticmethod
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cdef int cost(StateClass s, const GoldParseC* gold, int label) except -1:
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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 int move_cost(StateClass s, const GoldParseC* gold) except -1:
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if NON_MONOTONIC:
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return pop_cost(s, gold, s.S(0))
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else:
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return children_in_buffer(s, s.S(0), gold.heads)
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@staticmethod
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cdef int label_cost(StateClass s, const GoldParseC* gold, int label) except -1:
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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(StateClass st, int label) except -1:
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if NON_MONOTONIC:
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return st.stack_depth() >= 1 #and not missing_brackets(s)
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else:
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return st.stack_depth() >= 1 and not st.has_head(st.S(0))
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@staticmethod
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cdef int transition(State* state, int label) except -1:
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# Interpret left-arcs from EOL as attachment to root
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if at_eol(state):
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add_dep(state, state.stack[0], state.stack[0], label)
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else:
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add_dep(state, state.i, state.stack[0], label)
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pop_stack(state)
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@staticmethod
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cdef int cost(StateClass s, const GoldParseC* gold, int label) except -1:
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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 int move_cost(StateClass s, const GoldParseC* gold) except -1:
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if arc_is_gold(gold, s.B(0), s.S(0)):
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return 0
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else:
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return 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 int label_cost(StateClass s, const GoldParseC* gold, int label) except -1:
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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(StateClass st, int label) except -1:
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return st.stack_depth() >= 1 and not st.eol()
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@staticmethod
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cdef int transition(State* state, int label) except -1:
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add_dep(state, state.stack[0], state.i, label)
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push_stack(state)
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@staticmethod
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cdef int cost(StateClass s, const GoldParseC* gold, int label) except -1:
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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 int move_cost(StateClass s, const GoldParseC* gold) except -1:
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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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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 int label_cost(StateClass s, const GoldParseC* gold, int label) except -1:
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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(StateClass st, int label) except -1:
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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.eol():
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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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elif NON_MONOTONIC:
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return True
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else:
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# In the Break transition paper, they have this constraint that prevents
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# Break if stack is disconnected. But, if we're doing non-monotonic parsing,
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# we prefer to relax this constraint. This is helpful in parsing whole
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# documents, because then we don't get stuck with words on the stack.
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seen_headless = False
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for i in range(st.stack_depth()):
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if not st.has_head(st.S(i)):
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if seen_headless:
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return False
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else:
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seen_headless = True
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# TODO: Constituency constraints
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return True
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@staticmethod
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cdef int transition(State* state, int label) except -1:
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state.sent[state.i-1].sent_end = True
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while state.stack_len != 0:
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if get_s0(state).head == 0:
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get_s0(state).dep = label
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state.stack -= 1
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state.stack_len -= 1
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@staticmethod
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cdef int cost(StateClass s, const GoldParseC* gold, int label) except -1:
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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 int move_cost(StateClass s, const GoldParseC* gold) except -1:
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# When we break, we Reduce all of the words on the stack.
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cdef int cost = 0
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# Number of deps between S0...Sn and N0...Nn
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cdef int i, B_i, S_i
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for i in range(s.buffer_length()):
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B_i = s.B(i)
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for j in range(s.stack_depth()):
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S_i = s.S(j)
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cost += gold.heads[B_i] == S_i
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cost += gold.heads[S_i] == B_i
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return cost
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@staticmethod
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cdef int label_cost(StateClass s, const GoldParseC* gold, int label) except -1:
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return 0
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cdef class ArcEager(TransitionSystem):
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@classmethod
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def get_labels(cls, gold_parses):
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move_labels = {SHIFT: {'': True}, REDUCE: {'': True}, RIGHT: {},
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LEFT: {'ROOT': True}, BREAK: {'ROOT': True}}
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for raw_text, sents in 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 != 'ROOT':
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if head < child:
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move_labels[RIGHT][label] = True
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elif head > child:
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move_labels[LEFT][label] = True
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return move_labels
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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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gold.c.heads[i] = gold.heads[i]
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gold.c.labels[i] = self.strings[gold.labels[i]]
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for end, brackets in gold.brackets.items():
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for start, label_strs in brackets.items():
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gold.c.brackets[start][end] = 1
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for label_str in label_strs:
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# Add the encoded label to the set
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gold.brackets[end][start].add(self.strings[label_str])
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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.label_ids[label_str]
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else:
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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, State* state) except -1:
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push_stack(state)
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cdef int finalize_state(self, State* state) except -1:
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cdef int root_label = self.strings['ROOT']
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for i in range(state.sent_len):
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if state.sent[i].head == 0 and state.sent[i].dep == 0:
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state.sent[i].dep = root_label
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cdef int set_valid(self, bint* output, StateClass stcls) except -1:
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cdef bint[N_MOVES] is_valid
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is_valid[SHIFT] = Shift.is_valid(stcls, -1)
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is_valid[REDUCE] = Reduce.is_valid(stcls, -1)
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is_valid[LEFT] = LeftArc.is_valid(stcls, -1)
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is_valid[RIGHT] = RightArc.is_valid(stcls, -1)
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is_valid[BREAK] = Break.is_valid(stcls, -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* output, 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 int[N_MOVES] move_costs
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for i in range(N_MOVES):
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move_costs[i] = -1
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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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self.set_valid(self._is_valid, stcls)
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for i in range(self.n_moves):
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if not self._is_valid[i]:
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output[i] = 9000
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else:
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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] == -1:
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move_costs[move] = move_cost_funcs[move](stcls, &gold.c)
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output[i] = move_costs[move] + label_cost_funcs[move](stcls, &gold.c, label)
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cdef Transition best_valid(self, const weight_t* scores, StateClass stcls) except *:
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cdef bint[N_MOVES] is_valid
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is_valid[SHIFT] = Shift.is_valid(stcls, -1)
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is_valid[REDUCE] = Reduce.is_valid(stcls, -1)
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is_valid[LEFT] = LeftArc.is_valid(stcls, -1)
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is_valid[RIGHT] = RightArc.is_valid(stcls, -1)
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is_valid[BREAK] = Break.is_valid(stcls, -1)
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cdef Transition best
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cdef weight_t score = MIN_SCORE
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cdef int i
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for i in range(self.n_moves):
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if scores[i] > score and is_valid[self.c[i].move]:
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best = self.c[i]
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score = scores[i]
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assert best.clas < self.n_moves
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assert score > MIN_SCORE
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# Label Shift moves with the best Right-Arc label, for non-monotonic
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# actions
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if best.move == SHIFT:
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score = MIN_SCORE
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for i in range(self.n_moves):
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if self.c[i].move == RIGHT and scores[i] > score:
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best.label = self.c[i].label
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score = scores[i]
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return best
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