code: def ctc_unique_labels(labels, name=None):
      ctc_labels = ivy.unique_all(labels, by_value=False)
      unique_pad = ivy.pad(
          ctc_labels[0],
          (0, labels.size - ctc_labels[0].size),
          mode="constant",
      )
      return unique_pad, ctc_labels[2]
  
imports: import ivy
  from ivy.functional.frontends.tensorflow.func_wrapper import to_ivy_arrays_and_back
  from ivy.func_wrapper import with_unsupported_dtypes, with_supported_dtypes
  from ivy.functional.frontends.tensorflow import check_tensorflow_casting
label_desc: Use image node_id 20 for calling a global function with example usage: ctc_unique_labels(labels, name) and returns: unique_pad,  ctc_labels