From 6b1a2121cba7c32686d29515a6dc322e62435049 Mon Sep 17 00:00:00 2001
From: Patrick Simianer <p@simianer.de>
Date: Fri, 27 Feb 2015 12:43:45 +0100
Subject: simplified update

---
 training/dtrain/update.h | 33 ++++++++++++++++-----------------
 1 file changed, 16 insertions(+), 17 deletions(-)

(limited to 'training/dtrain')

diff --git a/training/dtrain/update.h b/training/dtrain/update.h
index 72d369c4..d7224cca 100644
--- a/training/dtrain/update.h
+++ b/training/dtrain/update.h
@@ -10,6 +10,16 @@ _cmp(ScoredHyp a, ScoredHyp b)
   return a.gold > b.gold;
 }
 
+inline bool
+_good(ScoredHyp& a, ScoredHyp& b, weight_t margin)
+{
+  if ((a.model-b.model)>margin
+      || a.gold==b.gold)
+    return true;
+
+  return false;
+}
+
 /*
  * multipartite ranking
  *  sort (descending) by bleu
@@ -19,35 +29,24 @@ _cmp(ScoredHyp a, ScoredHyp b)
 inline size_t
 CollectUpdates(vector<ScoredHyp>* s,
                SparseVector<weight_t>& updates,
-               float margin=0.)
+               weight_t margin=0.)
 {
   size_t num_up = 0;
   size_t sz = s->size();
-  if (sz < 2) return 0;
   sort(s->begin(), s->end(), _cmp);
   size_t sep = round(sz*0.1);
-  size_t sep_hi = sep;
-  if (sz > 4) {
-    while (sep_hi<sz && (*s)[sep_hi-1].gold==(*s)[sep_hi].gold)
-      ++sep_hi;
-  }
-  else sep_hi = 1;
-  for (size_t i = 0; i < sep_hi; i++) {
-    for (size_t j = sep_hi; j < sz; j++) {
-      if (((*s)[i].model-(*s)[j].model) > margin
-          || (*s)[i].gold == (*s)[j].gold)
+  for (size_t i = 0; i < sep; i++) {
+    for (size_t j = sep; j < sz; j++) {
+      if (_good((*s)[i], (*s)[j], margin))
         continue;
       updates += (*s)[i].f-(*s)[j].f;
       num_up++;
     }
   }
   size_t sep_lo = sz-sep;
-  while (sep_lo>=sep_hi && (*s)[sep_lo].gold==(*s)[sep_lo+1].gold)
-    --sep_lo;
-  for (size_t i = sep_hi; i < sep_lo; i++) {
+  for (size_t i = sep; i < sep_lo; i++) {
     for (size_t j = sep_lo; j < sz; j++) {
-      if (((*s)[i].model-(*s)[j].model) > margin
-          || (*s)[i].gold == (*s)[j].gold)
+      if (_good((*s)[i], (*s)[j], margin))
         continue;
       updates += (*s)[i].f-(*s)[j].f;
       num_up++;
-- 
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