code: def test_float32_dtype_size(self):
      self.assertEqual(dtype_utils.dtype_size("float32"), 32)
  
imports: from keras.backend.common.keras_tensor import KerasTensor
  from keras.testing import test_case
  from keras.utils import dtype_utils
label_desc: Use image node_id 3 for calling the DtypeSizeTests obj's underlying member method code with example usage: obj.test_float32_dtype_size() without return types