remove unused imports in utils.py
@@ -7,10 +7,9 @@ from distutils.version import LooseVersion
import keras
from keras.utils import np_utils
from keras.models import Sequential
-from keras.layers import Dense, Dropout, Activation, Flatten
+from keras.layers import Dense, Activation, Flatten
import matplotlib.pyplot as plt
import numpy as np
-import os
if LooseVersion(keras.__version__) >= LooseVersion('2.0.0'):
from keras.layers import Conv2D
