diff --git a/egs/aishell/paraformer/run.sh b/egs/aishell/paraformer/run.sh
index 9d76a5b74..60078a03a 100755
--- a/egs/aishell/paraformer/run.sh
+++ b/egs/aishell/paraformer/run.sh
@@ -3,8 +3,8 @@
 . ./path.sh || exit 1;
 
 # machines configuration
-CUDA_VISIBLE_DEVICES="0,1"
-gpu_num=2
+CUDA_VISIBLE_DEVICES="0"
+gpu_num=1
 count=1
 gpu_inference=true  # Whether to perform gpu decoding, set false for cpu decoding
 # for gpu decoding, inference_nj=ngpu*njob; for cpu decoding, inference_nj=njob
diff --git a/funasr/layers/abs_normalize.py b/funasr/layers/abs_normalize.py
new file mode 100644
index 000000000..4e617d0e1
--- /dev/null
+++ b/funasr/layers/abs_normalize.py
@@ -0,0 +1,14 @@
+from abc import ABC
+from abc import abstractmethod
+from typing import Tuple
+
+import torch
+
+
+class AbsNormalize(torch.nn.Module, ABC):
+    @abstractmethod
+    def forward(
+        self, input: torch.Tensor, input_lengths: torch.Tensor = None
+    ) -> Tuple[torch.Tensor, torch.Tensor]:
+        # return output, output_lengths
+        raise NotImplementedError
\ No newline at end of file