tensorflow报错：Unsupported feed type

  File "C:\anaconda\lib\site-packages\tensorflow\python\training\monitored_session.py", line 827, in run
    return self._sess.run(*args, **kwargs)
  File "C:\anaconda\lib\site-packages\tensorflow\python\client\session.py", line 889, in run
    run_metadata_ptr)
  File "C:\anaconda\lib\site-packages\tensorflow\python\client\session.py", line 1120, in _run
    feed_dict_tensor, options, run_metadata)
  File "C:\anaconda\lib\site-packages\tensorflow\python\client\session.py", line 1317, in _do_run
    options, run_metadata)
  File "C:\anaconda\lib\site-packages\tensorflow\python\client\session.py", line 1336, in _do_call
    raise type(e)(node_def, op, message)
tensorflow.python.framework.errors_impl.InternalError: Unsupported feed type

使用tf.contrib.learn.DNNClassifier分类器进行分类时，报出如上异常。
解决方法是：尽量使用numpy中的默认类型，如np.int,np.float等，而不要使用np.int32,np.float32.