From 7ebf32cd42fb1ea3db33603a7585792189b06d4a Mon Sep 17 00:00:00 2001
From: redpony <redpony@ec762483-ff6d-05da-a07a-a48fb63a330f>
Date: Tue, 30 Nov 2010 23:21:07 +0000
Subject: add flag to disable viterbi

git-svn-id: https://ws10smt.googlecode.com/svn/trunk@733 ec762483-ff6d-05da-a07a-a48fb63a330f
---
 training/model1.cc | 28 ++++++++++++++++------------
 1 file changed, 16 insertions(+), 12 deletions(-)

(limited to 'training')

diff --git a/training/model1.cc b/training/model1.cc
index 83dacd63..eacf4b32 100644
--- a/training/model1.cc
+++ b/training/model1.cc
@@ -19,7 +19,8 @@ bool InitCommandLine(int argc, char** argv, po::variables_map* conf) {
   opts.add_options()
         ("iterations,i",po::value<unsigned>()->default_value(5),"Number of iterations of EM training")
         ("beam_threshold,t",po::value<double>()->default_value(-4),"log_10 of beam threshold (-10000 to include everything, 0 max)")
-        ("no_null_word,N","Do not generate from the null token");
+        ("no_null_word,N","Do not generate from the null token")
+        ("no_add_viterbi,V","Do not add Viterbi alignment points (may generate a grammar where some training sentence pairs are unreachable)");
   po::options_description clo("Command line options");
   clo.add_options()
         ("config", po::value<string>(), "Configuration file")
@@ -51,6 +52,7 @@ int main(int argc, char** argv) {
   const double BEAM_THRESHOLD = pow(10.0, conf["beam_threshold"].as<double>());
   const bool use_null = (conf.count("no_null_word") == 0);
   const WordID kNULL = TD::Convert("<eps>");
+  const bool add_viterbi = (conf.count("no_add_viterbi") == 0);
 
   TTable tt;
   TTable::Word2Word2Double was_viterbi;
@@ -95,19 +97,21 @@ int main(int argc, char** argv) {
           sum += probs[i];
         }
         if (final_iteration) {
-          WordID max_i = 0;
-          double max_p = -1;
-          if (use_null) {
-            max_i = kNULL;
-            max_p = probs[0];
-          }
-          for (int i = 1; i <= src.size(); ++i) {
-            if (probs[i] > max_p) {
-              max_p = probs[i];
-              max_i = src[i-1][0].label;
+          if (add_viterbi) {
+            WordID max_i = 0;
+            double max_p = -1;
+            if (use_null) {
+              max_i = kNULL;
+              max_p = probs[0];
+            }
+            for (int i = 1; i <= src.size(); ++i) {
+              if (probs[i] > max_p) {
+                max_p = probs[i];
+                max_i = src[i-1][0].label;
+              }
             }
+            was_viterbi[max_i][f_j] = 1.0;
           }
-          was_viterbi[max_i][f_j] = 1.0;
         } else {
           if (use_null)
             tt.Increment(kNULL, f_j, probs[0] / sum);
-- 
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