From 03cf258a4cef2b74a15d8dcf32cc709a8ee1563a Mon Sep 17 00:00:00 2001
From: Michael Denkowski <mdenkows@cs.cmu.edu>
Date: Mon, 3 Mar 2014 07:58:11 -0800
Subject: Online bilex counts

---
 python/cdec/sa/rulefactory.pxi | 31 +++++++++++++++++++++++--------
 1 file changed, 23 insertions(+), 8 deletions(-)

(limited to 'python/cdec/sa/rulefactory.pxi')

diff --git a/python/cdec/sa/rulefactory.pxi b/python/cdec/sa/rulefactory.pxi
index 78a23196..37dd6d3b 100644
--- a/python/cdec/sa/rulefactory.pxi
+++ b/python/cdec/sa/rulefactory.pxi
@@ -33,7 +33,8 @@ OnlineFeatureContext = namedtuple('OnlineFeatureContext',
      'paircount',
      'bilex_f',
      'bilex_e',
-     'bilex_fe'
+     'bilex_fe',
+     'bilex_ef'
     ])
 
 cdef class OnlineStats:
@@ -45,6 +46,7 @@ cdef class OnlineStats:
     cdef public bilex_f
     cdef public bilex_e
     cdef public bilex_fe
+    cdef public bilex_ef
 
     def __cinit__(self):
         # Keep track of everything that can be sampled:
@@ -60,6 +62,7 @@ cdef class OnlineStats:
         self.bilex_f = defaultdict(int)
         self.bilex_e = defaultdict(int)
         self.bilex_fe = defaultdict(lambda: defaultdict(int))
+        self.bilex_ef = defaultdict(lambda: defaultdict(int))
 
 cdef int PRECOMPUTE = 0
 cdef int MERGE = 1
@@ -2052,13 +2055,25 @@ cdef class HieroCachingRuleFactory:
                 stats.phrases_al[f_ph][e_ph] = al
             
         # Update Bilexical counts
-        # TODO: use alignments instead of cooc
-        for e_w in e_words:
-            stats.bilex_e[e_w] += 1
-        for f_w in f_words:
-            stats.bilex_f[f_w] += 1
-            for e_w in e_words:
-                stats.bilex_fe[f_w][e_w] += 1
+        aligned_fe = [list() for _ in range(len(f_words))]
+        aligned_ef = [list() for _ in range(len(e_words))]
+        for (i, j) in alignment:
+            aligned_fe[i].append(j)
+            aligned_ef[j].append(i)
+        for f_i in range(len(f_words)):
+            e_i_aligned = aligned_fe[f_i]
+            lc = len(e_i_aligned)
+            if lc > 0:
+                stats.bilex_f[f_words[f_i]] += 1
+                for e_i in e_i_aligned:
+                    stats.bilex_fe[f_words[f_i]][e_words[e_i]] += (1.0) / lc
+        for e_i in range(len(e_words)):
+            f_i_aligned = aligned_ef[e_i]
+            lc = len(f_i_aligned)
+            if lc > 1:
+                stats.bilex_e[e_words[e_i]] += 1
+                for f_i in f_i_aligned:
+                    stats.bilex_ef[e_words[e_i]][f_words[f_i]] += (1.0) / lc
 
     # Create a rule from source, target, non-terminals, and alignments
     def form_rule(self, f_i, e_i, f_span, e_span, nt, al):
-- 
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