message: Fix `nn` module RNN namespace issues.
diff: @@ -157,6 +157,9 @@ from tensorflow.python.ops import rnn_cell
  # Required due to `rnn` and `rnn_cell` not being imported in `nn` directly
  # (due to a circular dependency issue: rnn depends on layers).
  nn.dynamic_rnn = rnn.dynamic_rnn
  +nn.static_rnn = rnn.static_rnn
  +nn.raw_rnn = rnn.raw_rnn
  +nn.bidirectional_dynamic_rnn = rnn.bidirectional_dynamic_rnn
  nn.rnn_cell = rnn_cell
  # Symbols whitelisted for export without documentation.
  