message: Improve error message format when reporting batch dimension mismatch in conv2d.
  Before:
  input and out_backprop must have the same batch sizeinput batch: 2outbackprop batch: 1 batch_dim: 0
  After:
  input and out_backprop must have the same batch size. Input batch: 2, outbackprop batch: 1 , batch_dim: 0
diff: @@ -115,10 +115,10 @@ Status ConvBackpropComputeDimensionsV2(
  dims->batch_size = input_shape.dim_size(batch_dim);
  if (dims->batch_size != out_backprop_shape.dim_size(batch_dim)) {
  return errors::InvalidArgument(
  - label, ": input and out_backprop must have the same batch size",
  - "input batch: ", dims->batch_size,
  - "outbackprop batch: ", out_backprop_shape.dim_size(batch_dim),
  - " batch_dim: ", batch_dim);
  + label, ": input and out_backprop must have the same batch size.",
  + " Input batch: ", dims->batch_size,
  + ", outbackprop batch: ", out_backprop_shape.dim_size(batch_dim),
  + ", batch_dim: ", batch_dim);
  }
  int feature_dim = GetTensorFeatureDimIndex(num_dims, data_format);
  