add librosa dependency

requirements.txt

@@ -5,3 +5,4 @@ pandas==0.25.1
 tensorflow==1.14.0
 ffmpeg-python
 norbert==0.2.1
+librosa==0.7.2

setup.py

@@ -14,7 +14,7 @@ __license__ = 'MIT License'
 
 # Default project values.
 project_name = 'spleeter'
-project_version = '1.4.9'
+project_version = '1.5.0'
 tensorflow_dependency = 'tensorflow'
 tensorflow_version = '1.14.0'
 here = path.abspath(path.dirname(__file__))
@@ -56,6 +56,7 @@ setup(
         'pandas==0.25.1',
         'requests',
         'setuptools>=41.0.0',
+        'librosa==0.7.2',
         '{}=={}'.format(tensorflow_dependency, tensorflow_version),
     ],
     extras_require={

spleeter/model/__init__.py

@@ -18,7 +18,6 @@ __author__ = 'Deezer Research'
 __license__ = 'MIT License'
 
 
-
 placeholder = tf.compat.v1.placeholder
 
 
@@ -326,14 +325,14 @@ class EstimatorSpecBuilder(object):
             self._build_masked_stfts()
         return self._masked_stfts
 
-    def _inverse_stft(self, stft, time_crop=None):
+    def _inverse_stft(self, stft_t, time_crop=None):
         """ Inverse and reshape the given STFT
 
-        :param stft: input STFT
+        :param stft_t: input STFT
         :returns: inverse STFT (waveform)
         """
         inversed = inverse_stft(
-            tf.transpose(stft, perm=[2, 0, 1]),
+            tf.transpose(stft_t, perm=[2, 0, 1]),
             self._frame_length,
             self._frame_step,
             window_fn=lambda frame_length, dtype: (