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* `python neural_gpu_trainer.py --task=rev` raises the following TypeError:

  File “..models/neural_gpu/neural_gpu.py", line 26, in conv_linear
    assert args
  File “..tensorflow/python/framework/ops.py", line 475, in __nonzero__
    raise TypeError("Using a `tf.Tensor` as a Python `bool` is not allowed. "
TypeError: Using a `tf.Tensor` as a Python `bool` is not allowed. Use `if t is not None:` instead of `if t:` to test if a tensor is defined, and use the logical TensorFlow ops to test the value of a tensor.