Traceback (most recent call last):
  File "test_generator.py", line 93, in <module>
    model3()
  File "test_generator.py", line 92, in model3
    validation_data = None)
  File "/usr/local/lib/python2.7/site-packages/keras/legacy/interfaces.py", line 88, in wrapper
    return func(*args, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/keras/engine/training.py", line 1868, in fit_generator
    batch_size = list(x.values())[0].shape[0]
AttributeError: 'list' object has no attribute 'shape'