code: def testLibrispeechSlowVsFast(self, params=None):
      self.testSlowVsFast(
          get_model_fn=small_librispeech_model, p=params
      )
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import numpy
  from tensor2tensor.data_generators import librispeech
  from tensor2tensor.data_generators import problem_hparams
  from tensor2tensor.models import transformer
  import tensorflow.compat.v1
  from tensorflow.compat.v1 import estimator
label_desc: Use image node_id 3 for calling the TransformerTest obj's underlying member method code with example usage: obj.testLibrispeechSlowVsFast(params) without return types