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Code was written for python2

This reverts commit 6d829caa.

tf.contrib.framework.get_or_create_global_step -> tf.train.get_or_create_global_step

This will error when num_gpus > 1

In reader.py, GFile returns an object of type bytes independently from the Python version. Therefore, the object must be decoded as string in any case. Removed the check of Python version

Make ptb_word_lm compatible with the latest TensorFlow source while maintaining backwards compatibility with TF 1.0

Fixes #1014