class_docstr: KafkaIOLayerHelper
code: def func(self):
      channel = f"e{time.time()}e"
      self._topic = "io-layer-test-" + channel
      return tfio.experimental.IOLayer.kafka(self._topic)
  
file_path: io/tests/test_io_layer.py
imports: import os
  import sys
  import time
  import tempfile
  import pytest
  import numpy
  import tensorflow
  import tensorflow_io
label_desc: Use image node_id 1 for calling the KafkaIOLayerHelper obj's underlying member method code with example usage: obj.func() and returns: tfio