commit a62fa909c75e291ebe95e2a0625276a7cdbdf9b3
author Lev Proleev <levp@google.com> Mon Jan 27 15:46:59 2020 +0000
committer Slava Shklyaev <slavash@google.com> Wed Feb 26 10:25:48 2020 +0000
tree e927939ea22abe4ff3e4752ffccf3a04c1e1f476
parent 721ee16d0ec3543b797a2b4c0aca534d069578b3

Add parallel linking support for BIDIRECTIONAL_SEQUENCE_LSTM

Previoulsy, BIDIRECTIONAL_SEQUENCE_LSTM only supported cross-linking
mode, i.e. passing the regular and the auxiliary input to both the
forward and backward networks in the next BIDIRECTIONAL_SEQUENCE_LSTM op:

       AUX_INPUT   (AUX_INPUT_REVERSED)
           |             |
     INPUT | (INPUT_R'D.)|
       |   |       |     |
    -----------------------
    |  \  /        \    / |
    | FW_LSTM     BW_LSTM |
    -----------------------
         |           |
      FW_OUT      BW_OUT

This CL adds support for parallel linking of bidirectional sequence
LSTMs, where the regular input is passed only to the forward network and
the auxiliary input is passed only to the backward network:

       INPUT (AUX_INPUT_REVERSED)
         |         |
    ---------------------
    | FW_LSTM   BW_LSTM |
    ---------------------
         |         |
      FW_OUT     BW_OUT

Fix: 138653129
Test: NNTest_static and VtsHalNeuralnetworksV1_3TargetTest
Change-Id: Iba255c6377aa8f74d78e09c44c483ec406fe6539
Merged-In: Iba255c6377aa8f74d78e09c44c483ec406fe6539
(cherry picked from commit e613aa6e784fba2cb8725c7025085a79ac48c33c)