[src] Speed optimization for decoders (call templates properly) (kald…

…i-asr#3637)

src/decoder/faster-decoder.cc

@@ -47,10 +47,7 @@ void FasterDecoder::InitDecoding() {
 
 void FasterDecoder::Decode(DecodableInterface *decodable) {
   InitDecoding();
-  while (!decodable->IsLastFrame(num_frames_decoded_ - 1)) {
-    double weight_cutoff = ProcessEmitting(decodable);
-    ProcessNonemitting(weight_cutoff);
-  }
+  AdvanceDecoding(decodable);
 }
 
 void FasterDecoder::AdvanceDecoding(DecodableInterface *decodable,

src/decoder/lattice-faster-decoder.cc

@@ -78,17 +78,10 @@ void LatticeFasterDecoderTpl<FST, Token>::InitDecoding() {
 template <typename FST, typename Token>
 bool LatticeFasterDecoderTpl<FST, Token>::Decode(DecodableInterface *decodable) {
   InitDecoding();
-
   // We use 1-based indexing for frames in this decoder (if you view it in
   // terms of features), but note that the decodable object uses zero-based
   // numbering, which we have to correct for when we call it.
-
-  while (!decodable->IsLastFrame(NumFramesDecoded() - 1)) {
-    if (NumFramesDecoded() % config_.prune_interval == 0)
-      PruneActiveTokens(config_.lattice_beam * config_.prune_scale);
-    BaseFloat cost_cutoff = ProcessEmitting(decodable);
-    ProcessNonemitting(cost_cutoff);
-  }
+  AdvanceDecoding(decodable);
   FinalizeDecoding();
 
   // Returns true if we have any kind of traceback available (not necessarily

src/decoder/simple-decoder.cc

@@ -32,13 +32,7 @@ SimpleDecoder::~SimpleDecoder() {
 
 bool SimpleDecoder::Decode(DecodableInterface *decodable) {
   InitDecoding();
-  while( !decodable->IsLastFrame(num_frames_decoded_ - 1)) {
-    ClearToks(prev_toks_);
-    cur_toks_.swap(prev_toks_);
-    ProcessEmitting(decodable);
-    ProcessNonemitting();
-    PruneToks(beam_, &cur_toks_);
-  }
+  AdvanceDecoding(decodable);
   return (!cur_toks_.empty());
 }