Merge pull request #335 from alibaba-damo-academy/dev_lhn2

update loading cmvn_file

funasr/models/frontend/wav_frontend.py

@@ -38,7 +38,7 @@ def load_cmvn(cmvn_file):
     return cmvn
 
 
-def apply_cmvn(inputs, cmvn_file):  # noqa
+def apply_cmvn(inputs, cmvn):  # noqa
     """
     Apply CMVN with mvn data
     """
@@ -47,7 +47,6 @@ def apply_cmvn(inputs, cmvn_file):  # noqa
     dtype = inputs.dtype
     frame, dim = inputs.shape
 
-    cmvn = load_cmvn(cmvn_file)
     means = np.tile(cmvn[0:1, :dim], (frame, 1))
     vars = np.tile(cmvn[1:2, :dim], (frame, 1))
     inputs += torch.from_numpy(means).type(dtype).to(device)
@@ -111,6 +110,7 @@ class WavFrontend(AbsFrontend):
         self.dither = dither
         self.snip_edges = snip_edges
         self.upsacle_samples = upsacle_samples
+        self.cmvn = None if self.cmvn_file is None else load_cmvn(self.cmvn_file)
 
     def output_size(self) -> int:
         return self.n_mels * self.lfr_m
@@ -140,8 +140,8 @@ class WavFrontend(AbsFrontend):
 
             if self.lfr_m != 1 or self.lfr_n != 1:
                 mat = apply_lfr(mat, self.lfr_m, self.lfr_n)
-            if self.cmvn_file is not None:
-                mat = apply_cmvn(mat, self.cmvn_file)
+            if self.cmvn is not None:
+                mat = apply_cmvn(mat, self.cmvn)
             feat_length = mat.size(0)
             feats.append(mat)
             feats_lens.append(feat_length)
@@ -194,8 +194,8 @@ class WavFrontend(AbsFrontend):
             mat = input[i, :input_lengths[i], :]
             if self.lfr_m != 1 or self.lfr_n != 1:
                 mat = apply_lfr(mat, self.lfr_m, self.lfr_n)
-            if self.cmvn_file is not None:
-                mat = apply_cmvn(mat, self.cmvn_file)
+            if self.cmvn is not None:
+                mat = apply_cmvn(mat, self.cmvn)
             feat_length = mat.size(0)
             feats.append(mat)
             feats_lens.append(feat_length)