message: Corrected citation: Graves et. al -2016 -> +2006
diff: @@ -842,7 +842,7 @@ def ctc_loss_v3(labels,
  name=None):
  """Computes CTC (Connectionist Temporal Classification) loss.
  - This op implements the CTC loss as presented in (Graves et al., 2016).
  + This op implements the CTC loss as presented in (Graves et al., 2006).
  Notes:
  @@ -882,7 +882,7 @@ def ctc_loss_v3(labels,
  References:
  Connectionist Temporal Classification - Labeling Unsegmented Sequence Data
  with Recurrent Neural Networks:
  - [Graves et al., 2016](https://dl.acm.org/citation.cfm?id=1143891)
  + [Graves et al., 2006](https://dl.acm.org/citation.cfm?id=1143891)
  ([pdf](http://www.cs.toronto.edu/~graves/icml_2006.pdf))
  """
  if isinstance(labels, sparse_tensor.SparseTensor):
  