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* Add comment to fill_context

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This commit is contained in:
Matthew Honnibal 2015-03-24 04:39:58 +01:00
parent 2741179aff
commit 01c892f583
1 changed files with 6 additions and 2 deletions
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8
spacy/syntax/_parse_features.pyx
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@ -7,6 +7,8 @@ out of "context") is in features/extractor.pyx
The atomic feature names are listed in a big enum, so that the feature tuples
can refer to them.
"""
from libc.string cimport memset
from itertools import combinations
from ..tokens cimport TokenC
@ -53,8 +55,10 @@ cdef inline void fill_token(atom_t* context, const TokenC* token) nogil:
cdef int fill_context(atom_t* context, State* state) except -1:
# This fills in the basic properties of each of our "slot" tokens, e.g.
# word on top of the stack, word at the front of the buffer, etc.
# Take care to fill every element of context!
# We could memset, but this makes it very easy to have broken features that
# make almost no impact on accuracy. If instead they're unset, the impact
# tends to be dramatic, so we get an obvious regression to fix...
fill_token(&context[S2w], get_s2(state))
fill_token(&context[S1w], get_s1(state))
fill_token(&context[S1rw], get_right(state, get_s1(state), 1))