diff --git a/egs/librispeech/ASR/pruned_transducer_stateless5/.conformer.py.swp b/egs/librispeech/ASR/pruned_transducer_stateless5/.conformer.py.swp
index bf9b394e8..cc5953acb 100644
Binary files a/egs/librispeech/ASR/pruned_transducer_stateless5/.conformer.py.swp and b/egs/librispeech/ASR/pruned_transducer_stateless5/.conformer.py.swp differ
diff --git a/egs/librispeech/ASR/pruned_transducer_stateless5/conformer.py b/egs/librispeech/ASR/pruned_transducer_stateless5/conformer.py
index 1ce489e5f..97ded1f54 100644
--- a/egs/librispeech/ASR/pruned_transducer_stateless5/conformer.py
+++ b/egs/librispeech/ASR/pruned_transducer_stateless5/conformer.py
@@ -33,6 +33,7 @@ from scaling import (
 from torch import Tensor, nn
 
 from icefall.utils import make_pad_mask, subsequent_chunk_mask
+import random
 
 
 class Conformer(EncoderInterface):