message: Corrected dimension notes in attention_wrapper.py
diff: @@ -979,9 +979,9 @@ def _compute_attention(attention_mechanism, cell_output, previous_alignments,
  # alignments shape is
  # [batch_size, 1, memory_time]
  # attention_mechanism.values shape is
  - # [batch_size, memory_time, attention_mechanism.num_units]
  + # [batch_size, memory_time, memory_size]
  # the batched matmul is over memory_time, so the output shape is
  - # [batch_size, 1, attention_mechanism.num_units].
  + # [batch_size, 1, memory_size].
  # we then squeeze out the singleton dim.
  context = math_ops.matmul(expanded_alignments, attention_mechanism.values)
  context = array_ops.squeeze(context, [1])
  