code: def test_cast_to_string_with_float32():
      tensor = tf.constant([0.1, 0.2], dtype=tf.float32)
      assert tf.string == data_utils.cast_to_string(tensor).dtype
  
file_path: autokeras/autokeras/utils/data_utils_test.py
imports: import numpy
  import pytest
  import tensorflow
  from autokeras.utils import data_utils
label_desc: Use image node_id 3 for calling a global function with example usage: test_cast_to_string_with_float32() without return types