message: CLN: fix coding style
diff: @@ -763,7 +763,8 @@ def _ExtractImagePatchesGrad(op, grad):
  (1, rows_out, cols_out, ksize_r * ksize_c))
  # Construct mapping table for indices: (input -> output).
  - idx_matrix = array_ops.concat([array_ops.expand_dims(input_idx_patched, axis=-1),
  + idx_matrix = array_ops.concat(
  + [array_ops.expand_dims(input_idx_patched, axis=-1),
  array_ops.expand_dims(output_idx, axis=-1)],
  axis=-1)
  idx_map = array_ops.reshape(idx_matrix, (-1, 2))
  