code: def test_c4_pretrain(self):
      _t5_gin_config()
  
      gin.bind_parameter("c4_bare_preprocess_fn.spm_path", _spm_path())
  
      gin.bind_parameter("batcher.batch_size_per_device", 8)
      gin.bind_parameter("batcher.eval_batch_size", 8)
      gin.bind_parameter("batcher.max_eval_length", 50)
      gin.bind_parameter("batcher.buckets", ([51], [8, 1]))
  
      # Just make sure this doesn't throw.
      _ = tf_inputs.data_streams(
          "c4",
          data_dir=_TESTDATA,
          input_name="inputs",
          target_name="targets",
          bare_preprocess_fn=tf_inputs.c4_bare_preprocess_fn,
      )
  
imports: import collections
  import os
  from unittest import mock
  import gin
  import numpy
  from t5.data import assert_dataset
  from t5.data import preprocessors
  import tensorflow
  import tensorflow_datasets
  from trax.data import inputs
  from trax.data import tf_inputs
label_desc: Use image node_id 15 for calling the TFInputsTest obj's underlying member method code with example usage: obj.test_c4_pretrain() without return types