code: def test_empty(self):
      items = []
      for item in tff.utils.iterate_nested({}):
          items.append(item)
      self.assertEmpty(items)
  
file_path: tf-quant-finance/tf_quant_finance/utils/tf_functions_test.py
imports: from typing import Dict
  import dataclasses
  import tensorflow.compat.v2
  import tf_quant_finance
  from tensorflow.python.framework import test_util
label_desc: Use image node_id 3 for calling the TfFunctionsTest obj's underlying member method code with example usage: obj.test_empty() without return types