From 8a841e06196b3c1149d7548968da36b09183f19b Mon Sep 17 00:00:00 2001
From: graehl <graehl@ec762483-ff6d-05da-a07a-a48fb63a330f>
Date: Fri, 23 Jul 2010 03:15:20 +0000
Subject: fsa: final features opt. for 0 state, correct left_end when # words =
 0

git-svn-id: https://ws10smt.googlecode.com/svn/trunk@374 ec762483-ff6d-05da-a07a-a48fb63a330f
---
 decoder/ff_from_fsa.h | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/decoder/ff_from_fsa.h b/decoder/ff_from_fsa.h
index 3bd3f070..cb7255d8 100755
--- a/decoder/ff_from_fsa.h
+++ b/decoder/ff_from_fsa.h
@@ -111,10 +111,14 @@ public:
                                       const void* residual_state,
                                       FeatureVector* final_features) const
   {
+    Sentence const& ends=ff.end_phrase();
+    SP ss=ff.start_state();
+    if (!ssz) {
+      AccumFeatures(ff,smeta,begin(ends),end(ends),final_features,ss);
+      return;
+    }
     WP l=(WP)residual_state,lend=left_end(residual_state);
     SP rst=fsa_state(residual_state);
-    SP ss=ff.start_state();
-    Sentence const& ends=ff.end_phrase();
     if (lend==rst) { // implying we have an fsa state
       AccumFeatures(ff,smeta,l,lend,final_features,ss); // e.g. <s> score(full left unscored phrase)
       AccumFeatures(ff,smeta,begin(ends),end(ends),final_features,rst); // e.g. [ctx for last M words] score("</s>")
@@ -154,10 +158,10 @@ private:
   */
 
   static inline WordID const* left_end(WordID const* left, WordID const* e) {
-    while (e>left)
-      if (*--e!=TD::none) break;
+    for (;e>left;--e)
+      if (e[-1]!=TD::none) break;
     //post: [left,e] are the seen left words
-    return e+1;
+    return e;
   }
   inline WP left_end(SP ant) const {
     return left_end((WP)ant,(WP)fsa_state(ant));
-- 
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