Merge branch 'develop' into ctcdecoders

Author: Jackwaterveg

examples/aishell/asr0/conf/tuning/chunk_decode.yaml

@@ -1,10 +1,10 @@
-chunk_batch_size: 32
+decode_batch_size: 32
 error_rate_type: cer 
 decoding_method: ctc_beam_search
 lang_model_path: data/lm/zh_giga.no_cna_cmn.prune01244.klm
 alpha: 2.2 #1.9
 beta: 4.3
-beam_size: 300
+beam_size: 500
 cutoff_prob: 0.99
 cutoff_top_n: 40
 num_proc_bsearch: 10

third_party/ctc_decoders/ctc_beam_search_decoder.cpp

@@ -474,13 +474,10 @@ CtcBeamSearchDecoderBatch::CtcBeamSearchDecoderBatch(
       ext_scorer(ext_scorer),
       blank_id(blank_id) {
     this->vocabulary = vocabulary;
-    // this->decoder_storage_vector.reserve(batch_size);
     for (size_t i = 0; i < batch_size; i++) {
         this->decoder_storage_vector.push_back(
             std::unique_ptr<CtcBeamSearchDecoderStorage>(
-                new CtcBeamSearchDecoderStorage(beam_size)));
-        // this->decoder_storage_vector.emplace_back(new
-        // CtcBeamSearchDecoderStorage());
+                new CtcBeamSearchDecoderStorage()));
         ctc_beam_search_decode_chunk_begin(
             this->decoder_storage_vector[i]->root, ext_scorer);
     }

third_party/ctc_decoders/ctc_beam_search_decoder.h

@@ -81,12 +81,10 @@ ctc_beam_search_decoder_batch(
 
 class CtcBeamSearchDecoderStorage {
   public:
-    size_t beam_size=-1;
     PathTrie *root = nullptr;
     std::vector<PathTrie *> prefixes;
 
-    CtcBeamSearchDecoderStorage(size_t beam_size) {
-        this->beam_size = beam_size;
+    CtcBeamSearchDecoderStorage() {
         // init prefixes' root
         this->root = new PathTrie();
         this->root->log_prob_b_prev = 0.0;