code: def test_element_spec_type(self):
      ds = ray.data.from_items([{"spam": 0, "ham": 0}])
  
      dataset = ds.to_tf(feature_columns="spam", label_columns="ham")
  
      feature_spec, label_spec = dataset.element_spec
      assert isinstance(feature_spec, tf.TypeSpec)
      assert isinstance(label_spec, tf.TypeSpec)
  
file_path: ray/python/ray/data/tests/test_tf.py
imports: import numpy
  import pandas
  import pytest
  import tensorflow
  import ray
  from ray import train
  from ray.data.preprocessors import Concatenator
  from ray.train import ScalingConfig
  from ray.train.tensorflow import TensorflowTrainer
label_desc: Use image node_id 2 for calling the TestToTF obj's underlying member method code with example usage: obj.test_element_spec_type() without return types