the tensorflow::ops namespace to tensorflow. * Change arg order for
`{softmax,sparse_softmax,sigmoid}_cross_entropy_with_logits` to be (labels,
predictions), and force use of named args. * tf.nn.rnn_cell.* and most functions
in tf.nn.rnn.* (with the exception of dynamic_rnn and raw_rnn) are temporarily
in tf.contrib.rnn. They will be moved back into core for TF 1.2. *
`tf.nn.sampled_softmax_loss` and `tf.nn.nce_loss` have both changed their API