Changed amp_to_db to power_to_db.

Author: Rick-McCoy

utils/audio.py

@@ -21,19 +21,13 @@ def get_normalized_mel(self, x):
         return x
 
     def pre_spec(self, x):
-        return self.normalize(self.amp_to_db(x) - self.hp.audio.ref_level_db)
+        return self.normalize(librosa.power_to_db(x) - self.hp.audio.ref_level_db)
 
     def post_spec(self, x):
-        return self.db_to_amp(self.denormalize(x) + self.hp.audio.ref_level_db)
-
-    def amp_to_db(self, x):
-        return 20.0 * np.log10(np.maximum(x, 1e-6))
+        return librosa.db_to_power(self.denormalize(x) + self.hp.audio.ref_level_db)
 
     def normalize(self, x):
         return np.clip(x / -self.hp.audio.min_level_db, -1.0, 0.0) + 1.0
 
-    def db_to_amp(self, x):
-        return np.power(10.0, 0.05 * x)
-
     def denormalize(self, x):
         return (np.clip(x, 0.0, 1.0) - 1.0) * -self.hp.audio.min_level_db

utils/tierutil.py

@@ -19,8 +19,8 @@ def __init__(self, hp):
         # 10*16000 // 180 + 1 = 889 (tedlium3)        
 
     def cut_divide_tiers(self, x, tierNo):
-        x = x[:, :-(x.size(-1) % self.t_div)]
-        M, T = x.size()
+        x = x[:, :-(x.shape[-1] % self.t_div)]
+        M, T = x.shape
         assert M % self.f_div == 0, \
             'freq(mel) dimension should be divisible by %d, got %d.' \
             % (self.f_div, M)