Summary:
Just an implementation of the forward pass of the GRU Unit Op, not the full RNNCell.
Functions were created to mimic LSTM implementation as closely as possible.
Implementation defined in GRU_unit_op.{h, cc}
tests put in gru_cell_test.py, which import rnn_cell_test_util.py for sigmoid, tanh, and _prepare_rnn functions.
Reviewed By: jamesr66a
Differential Revision: D5363697
fbshipit-source-id: f9ba9fe0be01ffc868dd22027be8be4975b84998
