diff --git a/egs/aishell/ASR/transformer_ctc/.train.py.swp b/egs/aishell/ASR/transformer_ctc/.train.py.swp
index 79767eb43..b727e3e20 100644
Binary files a/egs/aishell/ASR/transformer_ctc/.train.py.swp and b/egs/aishell/ASR/transformer_ctc/.train.py.swp differ
diff --git a/egs/aishell/ASR/transformer_ctc/train.py b/egs/aishell/ASR/transformer_ctc/train.py
index a917e87f9..6b231d9a6 100755
--- a/egs/aishell/ASR/transformer_ctc/train.py
+++ b/egs/aishell/ASR/transformer_ctc/train.py
@@ -207,7 +207,7 @@ def get_params() -> AttributeDict:
             # parameters for conformer
             "subsampling_factor": 4,
             "feature_dim": 80,
-            "attention_dim": 512,
+            "attention_dim": 256,
             "nhead": 4,
             "num_encoder_layers": 18,
             "num_decoder_layers": 0,