From 8bb00a2a2775442418f1cb7c041f7cba5d6e0d42 Mon Sep 17 00:00:00 2001
From: Patrick Simianer <p@simianer.de>
Date: Mon, 26 Sep 2011 21:51:52 +0200
Subject: got rid of scoring loop

---
 dtrain/kbestget.h | 46 +++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 39 insertions(+), 7 deletions(-)

(limited to 'dtrain/kbestget.h')

diff --git a/dtrain/kbestget.h b/dtrain/kbestget.h
index 2a2c6073..c0fd3f47 100644
--- a/dtrain/kbestget.h
+++ b/dtrain/kbestget.h
@@ -1,12 +1,6 @@
 #ifndef _DTRAIN_KBESTGET_H_
 #define _DTRAIN_KBESTGET_H_
 
-
-#include <vector>
-#include <string>
-
-using namespace std;
-
 #include "kbest.h" // cdec
 #include "verbose.h"
 #include "viterbi.h"
@@ -14,11 +8,13 @@ using namespace std;
 #include "decoder.h"
 #include "weights.h"
 
+using namespace std;
+
 namespace dtrain
 {
 
-typedef double score_t; // float
 
+typedef double score_t; // float
 
 struct ScoredHyp
 {
@@ -29,10 +25,44 @@ struct ScoredHyp
   unsigned rank;
 };
 
+struct LocalScorer
+{
+  unsigned N_;
+  vector<score_t> w_;
+
+  virtual score_t
+  Score(vector<WordID>& hyp, vector<WordID>& ref)=0;
+
+  void
+  Init(unsigned N, vector<score_t> weights)
+  {
+    assert(N > 0);
+    N_ = N;
+    if (weights.empty()) for (unsigned i = 0; i < N_; i++) w_.push_back(1./N_);
+    else w_ = weights;
+  }
+
+  score_t
+  brevity_penaly(const unsigned hyp_len, const unsigned ref_len)
+  {
+    if (hyp_len > ref_len) return 1;
+    return exp(1 - (score_t)ref_len/hyp_len);
+  }
+};
+
 struct HypSampler : public DecoderObserver
 {
+  LocalScorer* scorer_;
+  vector<WordID>* ref_;
   virtual vector<ScoredHyp>* GetSamples()=0;
+  void SetScorer(LocalScorer* scorer) { scorer_ = scorer; }
+  void SetRef(vector<WordID>& ref) { ref_ = &ref; } 
 };
+/////////////////////////////////////////////////////////////////////
+// wtf
+
+
+
 
 struct KBestGetter : public HypSampler
 {
@@ -77,6 +107,7 @@ struct KBestGetter : public HypSampler
       h.f = d->feature_values;
       h.model = log(d->score);
       h.rank = i;
+      h.score = scorer_->Score(h.w, *ref_);
       s_.push_back(h);
     }
   }
@@ -95,6 +126,7 @@ struct KBestGetter : public HypSampler
       h.f = d->feature_values;
       h.model = log(d->score);
       h.rank = i;
+      h.score = scorer_->Score(h.w, *ref_);
       s_.push_back(h);
     }
   }
-- 
cgit v1.2.3