Change defaults of basis-fMLLR.

git-svn-id: https://svn.code.sf.net/p/kaldi/code/trunk@1158 5e6a8d80-dfce-4ca6-a32a-6e07a63d50c8

src/transform/basis-fmllr-diag-gmm.h

@@ -43,15 +43,16 @@ namespace kaldi {
 
 struct BasisFmllrOptions {
   int32 num_iters;
-  BaseFloat size_scale;
+  BaseFloat size_scale; // how many basis elements we add for each new frame.
   BaseFloat min_count;
   int32 step_size_iters;
-  BasisFmllrOptions(): num_iters(10), size_scale(0.2), min_count(500.0), step_size_iters(3) { }
+  BasisFmllrOptions(): num_iters(10), size_scale(0.2), min_count(50.0), step_size_iters(3) { }
   void Register(ParseOptions *po) {
     po->Register("num-iters", &num_iters,
                  "Number of iterations in basis fMLLR update during testing");
     po->Register("size-scale", &size_scale,
-                 "Scale (< 1.0) of speaker occupancy to decide base number");
+                 "Scale (< 1.0) on speaker occupancy that gives number of "
+                 "basis elements.");
     po->Register("fmllr-min-count", &min_count,
                  "Minimum count required to update fMLLR");
     po->Register("step-size-iters", &step_size_iters,