add loss package

data/voxforge/voxforge.py

@@ -11,6 +11,7 @@ from __future__ import print_function
 
 import os
 import codecs
+import datetime
 import soundfile
 import json
 import argparse

data_utils/speech.py

@@ -3,6 +3,7 @@ from __future__ import absolute_import
 from __future__ import division
 from __future__ import print_function
 
+import numpy as np
 from data_utils.audio import AudioSegment