minor fixes

egs/librispeech/ASR/pruned_transducer_stateless5/decode.py

@@ -86,7 +86,7 @@ Usage:
     --beam 20.0 \
     --max-contexts 8 \
     --max-states 64
-    
+
 (8) modified beam search with RNNLM shallow fusion (with LG)
 ./pruned_transducer_stateless5/decode.py \
     --epoch 35 \
@@ -103,7 +103,7 @@ Usage:
     --rnn-lm-num-layers 3 \
     --rnn-lm-tie-weights 1
 
-    
+
 """
 
 
@@ -198,7 +198,7 @@ def get_parser():
     parser.add_argument(
         "--exp-dir",
         type=str,
-        default="lstm_transducer_stateless2/exp",
+        default="pruned_transducer_stateless5/exp",
         help="The experiment dir",
     )
 
@@ -228,7 +228,7 @@ def get_parser():
           - fast_beam_search_nbest
           - fast_beam_search_nbest_oracle
           - fast_beam_search_nbest_LG
-          - modified-beam-search3 # for rnn lm shallow fusion
+          - modified-beam-search_rnnlm_shallow_fusion # for rnn lm shallow fusion
         If you use fast_beam_search_nbest_LG, you have to specify
         `--lang-dir`, which should contain `LG.pt`.
         """,
@@ -265,7 +265,21 @@ def get_parser():
         It specifies the scale for n-gram LM scores.
         """,
     )
-    
+
+    parser.add_argument(
+        "--decode-chunk-size",
+        type=int,
+        default=16,
+        help="The chunk size for decoding (in frames after subsampling)",
+    )
+
+    parser.add_argument(
+        "--left-context",
+        type=int,
+        default=64,
+        help="left context can be seen during decoding (in frames after subsampling)",
+    )
+
     parser.add_argument(
         "--max-contexts",
         type=int,
@@ -317,7 +331,7 @@ def get_parser():
         Used only when the decoding method is fast_beam_search_nbest,
         fast_beam_search_nbest_LG, and fast_beam_search_nbest_oracle""",
     )
-    
+
     parser.add_argument(
         "--simulate-streaming",
         type=str2bool,
@@ -331,7 +345,7 @@ def get_parser():
         "--rnn-lm-scale",
         type=float,
         default=0.0,
-        help="""Used only when --method is modified_beam_search3.
+        help="""Used only when --method is modified_beam_search_rnnlm_shallow_fusion.
         It specifies the path to RNN LM exp dir.
         """,
     )
@@ -430,7 +444,7 @@ def decode_one_batch(
       word_table:
         The word symbol table.
       decoding_graph:
-        The decoding graph. Can be either a `k2.trivial_graph` or LG, Used
+        The decoding graph. Can be either a `k2.trivial_graph` or HLG, Used
         only when --decoding_method is fast_beam_search, fast_beam_search_nbest,
         fast_beam_search_nbest_oracle, and fast_beam_search_nbest_LG.
     Returns:
@@ -560,7 +574,7 @@ def decode_one_batch(
 
         for i in range(batch_size):
             # fmt: off
-            encoder_out_i = encoder_out[i:i + 1, :encoder_out_lens[i]]
+            encoder_out_i = encoder_out[i:i+1, :encoder_out_lens[i]]
             # fmt: on
             if params.decoding_method == "greedy_search":
                 hyp = greedy_search(
@@ -606,7 +620,7 @@ def decode_dataset(
     decoding_graph: Optional[k2.Fsa] = None,
     rnnlm: Optional[RnnLmModel] = None,
     rnnlm_scale: float = 1.0,
-) -> Dict[str, List[Tuple[List[str], List[str]]]]:
+) -> Dict[str, List[Tuple[str, List[str], List[str]]]]:
     """Decode dataset.
 
     Args:
@@ -683,7 +697,7 @@ def decode_dataset(
 def save_results(
     params: AttributeDict,
     test_set_name: str,
-    results_dict: Dict[str, List[Tuple[List[int], List[int]]]],
+    results_dict: Dict[str, List[Tuple[str, List[str], List[str]]]],
 ):
     test_set_wers = dict()
     for key, results in results_dict.items():
@@ -751,7 +765,9 @@ def main():
         params.suffix = f"iter-{params.iter}-avg-{params.avg}"
     else:
         params.suffix = f"epoch-{params.epoch}-avg-{params.avg}"
-
+    if params.simulate_streaming:
+        params.suffix += f"-streaming-chunk-size-{params.decode_chunk_size}"
+        params.suffix += f"-left-context-{params.left_context}"
     if "fast_beam_search" in params.decoding_method:
         params.suffix += f"-beam-{params.beam}"
         params.suffix += f"-max-contexts-{params.max_contexts}"
@@ -791,6 +807,11 @@ def main():
     params.unk_id = sp.piece_to_id("<unk>")
     params.vocab_size = sp.get_piece_size()
 
+    if params.simulate_streaming:
+        assert (
+            params.causal_convolution
+        ), "Decoding in streaming requires causal convolution"
+
     logging.info(params)
 
     logging.info("About to create model")