diff --git a/egs/aishell/ASR/conformer_ctc/decode.py b/egs/aishell/ASR/conformer_ctc/decode.py
index 2cb476e208..8dd6725365 100755
--- a/egs/aishell/ASR/conformer_ctc/decode.py
+++ b/egs/aishell/ASR/conformer_ctc/decode.py
@@ -366,13 +366,14 @@ def decode_dataset(
 
     num_cuts = 0
 
-    try:
-        num_batches = len(dl)
-    except TypeError:
-        num_batches = "?"
+    # try:
+    #     num_batches = len(dl)
+    # except TypeError:
+    #     num_batches = "?"
 
     results = defaultdict(list)
     for batch_idx, batch in enumerate(dl):
+        batch = batch[0]
         texts = batch["supervisions"]["text"]
         cut_ids = [cut.id for cut in batch["supervisions"]["cut"]]
 
@@ -399,9 +400,8 @@ def decode_dataset(
         num_cuts += len(batch["supervisions"]["text"])
 
         if batch_idx % 100 == 0:
-            batch_str = f"{batch_idx}/{num_batches}"
-
-            logging.info(f"batch {batch_str}, cuts processed until now is {num_cuts}")
+            # batch_str = f"{batch_idx}/{num_batches}"
+            logging.info(f"batch {batch_idx}, cuts processed until now is {num_cuts}")
     return results
 
 
@@ -547,20 +547,19 @@ def main():
 
     test_sets = ["test"]
     test_dls = [test_dl]
+    # for test_set, test_dl in zip(test_sets, test_dls):
+    results_dict = decode_dataset(
+        dl=test_dl,
+        params=params,
+        model=model,
+        HLG=HLG,
+        H=H,
+        lexicon=lexicon,
+        sos_id=sos_id,
+        eos_id=eos_id,
+    )
 
-    for test_set, test_dl in zip(test_sets, test_dls):
-        results_dict = decode_dataset(
-            dl=test_dl,
-            params=params,
-            model=model,
-            HLG=HLG,
-            H=H,
-            lexicon=lexicon,
-            sos_id=sos_id,
-            eos_id=eos_id,
-        )
-
-        save_results(params=params, test_set_name=test_set, results_dict=results_dict)
+    save_results(params=params, test_set_name=test_sets[0], results_dict=results_dict)
 
     logging.info("Done!")
 
diff --git a/egs/aishell/ASR/tdnn_lstm_ctc/asr_datamodule.py b/egs/aishell/ASR/tdnn_lstm_ctc/asr_datamodule.py
index aacbd153de..0571dddb78 100644
--- a/egs/aishell/ASR/tdnn_lstm_ctc/asr_datamodule.py
+++ b/egs/aishell/ASR/tdnn_lstm_ctc/asr_datamodule.py
@@ -23,6 +23,7 @@
 from pathlib import Path
 from typing import Any, Dict, List, Optional
 
+from lhotse.cut import MonoCut
 from lhotse import CutSet, Fbank, FbankConfig, load_manifest, load_manifest_lazy
 from lhotse.dataset import (
     CutConcatenate,
@@ -180,7 +181,34 @@ def add_arguments(cls, parser: argparse.ArgumentParser):
             help="When enabled, select noise from MUSAN and mix it"
             "with training dataset. ",
         )
+    def to_dict(self, obj):
+        """
+        Recursively convert an object and its nested objects to dictionaries.
+        """
+        if isinstance(obj, (str, int, float, bool, type(None))):
+            return obj
+        elif isinstance(obj, list):
+            return [to_dict(item) for item in obj]
+        elif isinstance(obj, dict):
+            return {key: to_dict(value) for key, value in obj.items()}
+        elif hasattr(obj, '__dict__'):
+            return {key: to_dict(value) for key, value in obj.__dict__.items()}
+        else:
+            raise TypeError(f"Unsupported type: {type(obj)}")
 
+    def my_collate_fn(self, batch):
+        """
+        Convert MonoCut to dict.
+        """
+        return_batch = []
+        for item in batch:
+            if isinstance(item, MonoCut):
+                processed_item = self.to_dict(item)
+                return_batch.append(processed_item)
+            elif isinstance(item, dict):
+                return_batch.append(item)
+        return return_batch
+    
     def train_dataloaders(
         self, cuts_train: CutSet, sampler_state_dict: Optional[Dict[str, Any]] = None
     ) -> DataLoader:
@@ -354,9 +382,10 @@ def test_dataloaders(self, cuts: CutSet) -> DataLoader:
         )
         test_dl = DataLoader(
             test,
-            batch_size=None,
+            batch_size=100, # specified to some value
             sampler=sampler,
-            num_workers=self.args.num_workers,
+            num_workers=4, # if larger, it will be more time-consuming for decoding, may stuck
+            collate_fn=self.my_collate_fn
         )
         return test_dl