code: def testSpecialFloatValues(self):
      coder = standard_artifacts.Float()
      positive_infinity_float = float("inf")
      negative_infinity_float = float("-inf")
      nan_float = float("nan")
  
      encoded_positive_infinity = coder.encode(positive_infinity_float)
      encoded_negative_infinity = coder.encode(negative_infinity_float)
      encoded_nan = coder.encode(nan_float)
  
      decoded_positive_infinity = coder.decode(
          encoded_positive_infinity
      )
      decoded_negative_infinity = coder.decode(
          encoded_negative_infinity
      )
      decoded_nan = coder.decode(encoded_nan)
  
      self.assertEqual(encoded_positive_infinity, b"Infinity")
      self.assertEqual(encoded_negative_infinity, b"-Infinity")
      self.assertEqual(encoded_nan, b"NaN")
  
      self.assertEqual(
          decoded_positive_infinity, positive_infinity_float
      )
      self.assertEqual(
          decoded_negative_infinity, negative_infinity_float
      )
  
      self.assertTrue(math.isinf(decoded_positive_infinity))
      self.assertTrue(math.isinf(decoded_negative_infinity))
      self.assertTrue(math.isnan(decoded_nan))
  
imports: import math
  from typing import Any, Dict
  from unittest import mock
  import absl
  import tensorflow
  from tfx.types import standard_artifacts
  from tfx.utils import json_utils
label_desc: Use image node_id 12 for calling the StandardArtifactsTest obj's underlying member method code with example usage: obj.testSpecialFloatValues() without return types