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* Fix Issue #251: Incorrect right edge calculation on left-clobber low in the tree

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Matthew Honnibal 2016-02-07 00:00:42 +01:00
parent 860fd11e98
commit 1b83cb9dfa
1 changed files with 12 additions and 0 deletions
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12
spacy/syntax/_state.pxd
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@ -240,10 +240,22 @@ cdef cppclass StateC:
void del_arc(int h_i, int c_i) nogil:
cdef int dist = h_i - c_i
cdef TokenC* h = &this._sent[h_i]
cdef int i = 0
if c_i > h_i:
# this.R_(h_i, 2) returns the second-rightmost child token of h_i
# If we have more than 2 rightmost children, our 2nd rightmost child's
# rightmost edge is going to be our new rightmost edge.
h.r_edge = this.R_(h_i, 2).r_edge if h.r_kids >= 2 else h_i
h.r_kids -= 1
new_edge = h.r_edge
# Correct upwards in the tree --- see Issue #251
while h.head < 0 and i < this.length: # Guard infinite loop
h += h.head
h.r_edge = new_edge
i += 1
else:
# Same logic applies for left edge, but we don't need to walk up
# the tree, as the head is off the stack.
h.l_edge = this.L_(h_i, 2).l_edge if h.l_kids >= 2 else h_i
h.l_kids -= 1