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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _read_info(info_path):
 """Returns info dict or None."""

  if not tf.io.gfile.exists(info_path):
    return None
  with tf.io.gfile.GFile(info_path) as info_f:
    return json.load(info_f)