code: def _str_to_bytes(self, x):
      if isinstance(x, list):
          return [self._str_to_bytes(v) for v in x]
      elif isinstance(x, str) and bytes is not str:
          return bytes(x, "utf-8")
      else:
          return x
  
imports: from absl.testing import parameterized
  import numpy
  from tensorflow.python.eager import context
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import indexed_slices
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import gradients_impl
  from tensorflow.python.ops.ragged import ragged_factory_ops
  from tensorflow.python.ops.ragged import ragged_gather_ops
  from tensorflow.python.ops.ragged import ragged_tensor
  from tensorflow.python.platform import googletest
label_desc: Use image node_id 2 for calling the RaggedGatherOpTest obj's underlying member method code with example usage: obj._str_to_bytes(x) and returns: unknown, bytes, x