RNN decoding refactoring

egs/librispeech/ASR/conformer_ctc/decode.py

@@ -30,7 +30,7 @@ from asr_datamodule import LibriSpeechAsrDataModule
 from conformer import Conformer
 
 from icefall.bpe_graph_compiler import BpeCtcTrainingGraphCompiler
-from icefall.checkpoint import average_checkpoints, load_checkpoint
+from icefall.checkpoint import load_checkpoint
 from icefall.decode import (
     get_lattice,
     nbest_decoding,
@@ -46,8 +46,10 @@ from icefall.lexicon import Lexicon
 from icefall.utils import (
     AttributeDict,
     get_texts,
+    load_averaged_model,
     setup_logger,
     store_transcripts,
+    str2bool,
     write_error_stats,
 )
 
@@ -174,19 +176,47 @@ def get_parser():
         """,
     )
 
+    parser.add_argument(
+        "--rnn-lm-embedding-dim",
+        type=int,
+        default=2048,
+        help="Embedding dim of the model",
+    )
+
+    parser.add_argument(
+        "--rnn-lm-hidden-dim",
+        type=int,
+        default=2048,
+        help="Hidden dim of the model",
+    )
+
+    parser.add_argument(
+        "--rnn-lm-num-layers",
+        type=int,
+        default=4,
+        help="Number of RNN layers the model",
+    )
+    parser.add_argument(
+        "--rnn-lm-tie-weights",
+        type=str2bool,
+        default=False,
+        help="""True share the weights between the input embedding layer and the
+        last output linear layer
+        """,
+    )
+
     return parser
 
 
 def get_rnn_lm_model(params: AttributeDict):
     from rnn_lm.model import RnnLmModel
 
-    # TODO: Pass the following options from command-line
     rnn_lm_model = RnnLmModel(
         vocab_size=params.num_classes,
-        embedding_dim=1024,
-        hidden_dim=1024,
-        num_layers=2,
-        tie_weights=False,
+        embedding_dim=params.rnn_lm_embedding_dim,
+        hidden_dim=params.rnn_lm_hidden_dim,
+        num_layers=params.rnn_lm_num_layers,
+        tie_weights=params.rnn_lm_tie_weights,
     )
     return rnn_lm_model
 
@@ -727,20 +757,16 @@ def main():
     if params.avg == 1:
         load_checkpoint(f"{params.exp_dir}/epoch-{params.epoch}.pt", model)
     else:
-        start = params.epoch - params.avg + 1
-        filenames = []
-        for i in range(start, params.epoch + 1):
-            if start >= 0:
-                filenames.append(f"{params.exp_dir}/epoch-{i}.pt")
-        logging.info(f"averaging {filenames}")
-        model.to(device)
-        model.load_state_dict(average_checkpoints(filenames, device=device))
+        model = load_averaged_model(
+            params.exp_dir, model, params.epoch, params.avg, device
+        )
 
     model.to(device)
     model.eval()
     num_param = sum([p.numel() for p in model.parameters()])
     logging.info(f"Number of model parameters: {num_param}")
 
+    rnn_lm_model = None
     if params.method == "rnn-lm":
         rnn_lm_model = get_rnn_lm_model(params)
         if params.rnn_lm_avg == 1:
@@ -748,19 +774,16 @@ def main():
                 f"{params.rnn_lm_exp_dir}/epoch-{params.rnn_lm_epoch}.pt",
                 rnn_lm_model,
             )
-        else:
-            start = params.rnn_lm_epoch - params.rnn_lm_avg + 1
-            filenames = []
-            for i in range(start, params.rnn_lm_epoch + 1):
-                if start >= 0:
-                    filenames.append(f"{params.rnn_lm_exp_dir}/epoch-{i}.pt")
-            logging.info(f"averaging {filenames}")
             rnn_lm_model.to(device)
-            rnn_lm_model.load_state_dict(
-                average_checkpoints(filenames, device=device)
-            )
         else:
-        rnn_lm_model = None
+            rnn_lm_model = load_averaged_model(
+                params.rnn_lm_exp_dir,
+                rnn_lm_model,
+                params.rnn_lm_epoch,
+                params.rnn_lm_avg,
+                device,
+            )
+        rnn_lm_model.eval()
 
     librispeech = LibriSpeechAsrDataModule(args)
 

egs/librispeech/ASR/rnn_lm/train.py

@@ -206,7 +206,7 @@ def get_params() -> AttributeDict:
             "batch_idx_train": 0,
             "log_interval": 200,
             "reset_interval": 2000,
-            "valid_interval": 30000,
+            "valid_interval": 10000,
             "env_info": get_env_info(),
         }
     )
@@ -539,6 +539,7 @@ def run(rank, world_size, args):
         embedding_dim=params.embedding_dim,
         hidden_dim=params.hidden_dim,
         num_layers=params.num_layers,
+        tie_weights=params.tie_weights,
     )
 
     checkpoints = load_checkpoint_if_available(params=params, model=model)

icefall/decode.py

@@ -22,6 +22,33 @@ import torch
 
 from icefall.utils import add_eos, add_sos, get_texts
 
+DEFAULT_LM_SCALE = [
+    0.01,
+    0.05,
+    0.08,
+    0.1,
+    0.3,
+    0.5,
+    0.6,
+    0.7,
+    0.9,
+    1.0,
+    1.1,
+    1.2,
+    1.3,
+    1.5,
+    1.7,
+    1.9,
+    2.0,
+    2.1,
+    2.2,
+    2.3,
+    2.5,
+    3.0,
+    4.0,
+    5.0,
+]
+
 
 def _intersect_device(
     a_fsas: k2.Fsa,
@@ -1082,28 +1109,17 @@ def rescore_with_rnn_lm(
 
     rnn_lm_scores = -1 * rnn_lm_nll.sum(dim=1)
 
-    if ngram_lm_scale is None:
-        ngram_lm_scale_list = [0.01, 0.05, 0.08]
-        ngram_lm_scale_list += [0.1, 0.3, 0.5, 0.6, 0.7, 0.9, 1.0]
-        ngram_lm_scale_list += [1.1, 1.2, 1.3, 1.5, 1.7, 1.9, 2.0]
-        ngram_lm_scale_list += [2.1, 2.2, 2.3, 2.5, 3.0, 4.0, 5.0]
-    else:
+    ngram_lm_scale_list = DEFAULT_LM_SCALE
+    attention_scale_list = DEFAULT_LM_SCALE
+    rnn_lm_scale_list = DEFAULT_LM_SCALE
+
+    if ngram_lm_scale:
         ngram_lm_scale_list = [ngram_lm_scale]
 
-    if attention_scale is None:
-        attention_scale_list = [0.01, 0.05, 0.08]
-        attention_scale_list += [0.1, 0.3, 0.5, 0.6, 0.7, 0.9, 1.0]
-        attention_scale_list += [1.1, 1.2, 1.3, 1.5, 1.7, 1.9, 2.0]
-        attention_scale_list += [2.1, 2.2, 2.3, 2.5, 3.0, 4.0, 5.0]
-    else:
+    if attention_scale:
         attention_scale_list = [attention_scale]
 
-    if rnn_lm_scale is None:
-        rnn_lm_scale_list = [0.01, 0.05, 0.08]
-        rnn_lm_scale_list += [0.1, 0.3, 0.5, 0.6, 0.7, 0.9, 1.0]
-        rnn_lm_scale_list += [1.1, 1.2, 1.3, 1.5, 1.7, 1.9, 2.0]
-        rnn_lm_scale_list += [2.1, 2.2, 2.3, 2.5, 3.0, 4.0, 5.0]
-    else:
+    if rnn_lm_scale:
         rnn_lm_scale_list = [rnn_lm_scale]
 
     ans = dict()

icefall/utils.py

@@ -35,6 +35,8 @@ import torch.distributed as dist
 import torch.nn as nn
 from torch.utils.tensorboard import SummaryWriter
 
+from icefall.checkpoint import average_checkpoints
+
 Pathlike = Union[str, Path]
 
 
@@ -807,3 +809,34 @@ def optim_step_and_measure_param_change(
             delta = l2_norm(p_orig - p_new) / l2_norm(p_orig)
             relative_change[n] = delta.item()
     return relative_change
+
+
+def load_averaged_model(
+    model_dir: str,
+    model: torch.nn.Module,
+    epoch: int,
+    avg: int,
+    device: torch.device,
+):
+    """
+    Load a model which is the average of all checkpoints
+
+    :param model_dir: a str of the experiment directory
+    :param model: a torch.nn.Module instance
+
+    :param epoch: the last epoch to load from
+    :param avg: how many models to average from
+    :param device: move model to this device
+
+    :return: A model averaged
+    """
+
+    # start cannot be negative
+    start = max(epoch - avg + 1, 0)
+    filenames = [f"{model_dir}/epoch-{i}.pt" for i in range(start, epoch + 1)]
+
+    logging.info(f"averaging {filenames}")
+    model.to(device)
+    model.load_state_dict(average_checkpoints(filenames, device=device))
+
+    return model