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Fix out-of-bounds access in NER training 

The helper method state.B(1) gets the index of the first token of the
buffer, or -1 if no such token exists. Normally this is safe because we
pass this to functions like state.safe_get(), which returns an empty
token. Here we used it directly as an array index, which is not okay!

This error may have been the cause of out-of-bounds access errors during
training. Similar errors may still be around, so much be hunted down.
Hunting this one down took a long time...I printed out values across
training runs and diffed, looking for points of divergence between
runs, when no randomness should be allowed.
This commit is contained in:
Matthew Honnibal 2018-10-27 00:46:30 +02:00
parent ea20b72c08
commit 817e1fc5e5
1 changed files with 1 additions and 1 deletions
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spacy/syntax/ner.pyx
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@ -330,7 +330,7 @@ cdef class In:
@staticmethod
cdef weight_t cost(StateClass s, const GoldParseC* gold, attr_t label) nogil:
move = IN
cdef int next_act = gold.ner[s.B(1)].move if s.B(0) < s.c.length else OUT
cdef int next_act = gold.ner[s.B(1)].move if s.B(1) >= 0 else OUT
cdef int g_act = gold.ner[s.B(0)].move
cdef attr_t g_tag = gold.ner[s.B(0)].label
cdef bint is_sunk = _entity_is_sunk(s, gold.ner)