code: def _tf_tensor_string_get_item(target, i):
      """Overload of get_item that stages a Tensor string read."""
      x = gen_string_ops.substr(target, i, 1)
      return x
  
imports: import collections
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import tensor_util
  from tensorflow.python.ops import gen_array_ops
  from tensorflow.python.ops import gen_string_ops
  from tensorflow.python.ops import list_ops
  from tensorflow.python.ops import tensor_array_ops
label_desc: Use image node_id 5 for calling a global function with example usage: _tf_tensor_string_get_item(target, i) and returns: x