message: Update data_feeder.py
diff: @@ -363,7 +363,7 @@ class DataFeeder(object):
  if x_is_dict:
  num_samples = list(self._x.values())[0].shape[0]
  - elif is_tensor(self._x)
  + elif is_tensor(self._x):
  num_samples = self._x.shape[0].value # shape will be a Dimension, extract an int
  else:
  num_samples = self._x.shape[0]
  