trunk: modify sliding-window CMVN algorithm to include current frame in window...

trunk: modify sliding-window CMVN algorithm to include current frame in window (note: this code not used in any recipes yet); modify prior-floor in nnet-cpu code to fix problem..

git-svn-id: https://svn.code.sf.net/p/kaldi/code/trunk@3032 5e6a8d80-dfce-4ca6-a32a-6e07a63d50c8

src/feat/feature-functions-test.cc

@@ -61,7 +61,7 @@ void UnitTestOnlineCmvn() {
         window_begin += shift;
       } else {
         window_begin = t - opts.cmn_window;
-        window_end = t;
+        window_end = t + 1;
         if (window_end < opts.min_window)
             window_end = opts.min_window;
       }

src/feat/feature-functions.cc

@@ -348,7 +348,7 @@ void SlidingWindowCmn(const SlidingWindowCmnOptions &opts,
       window_end = window_start + opts.cmn_window;
     } else {
       window_start = t - opts.cmn_window;
-      window_end = t;
+      window_end = t + 1;
     }
     if (window_start < 0) { // shift window right if starts <0.
       window_end -= window_start;
@@ -356,7 +356,7 @@ void SlidingWindowCmn(const SlidingWindowCmnOptions &opts,
     }
     if (!opts.center) {
       if (window_end > t)
-        window_end = std::max(t, opts.min_window);
+        window_end = std::max(t + 1, opts.min_window);
     }
     if (window_end > num_frames) {
       window_start -= (window_end - num_frames);

src/nnet-cpubin/nnet-train-transitions.cc

@@ -66,7 +66,12 @@ int main(int argc, char *argv[]) {
     
     bool binary_write = true;
     bool set_priors = true; // Also set the per-pdf priors in the model.
-    BaseFloat prior_floor = 1.0e-08;
+    BaseFloat prior_floor = 5.0e-06; // The default was previously 1e-8, but
+                                     // once we had problems with a pdf-id that
+                                     // was not being seen in training, being
+                                     // recognized all the time.  This value
+                                     // seemed to be the smallest prior of the
+                                     // "seen" pdf-ids in one run.
     MleTransitionUpdateConfig transition_update_config;
     
     ParseOptions po(usage);