docstr: Check the training script doesn't crash.
docstr_tok: ["Check","the","training","script","does","n't","crash","."]
code: def test_train_model_vocab_ul(self):
      """
      Check the training script doesn't crash.
      """
      with testing_utils.tempdir() as tmpdir:
          fp = os.path.join(tmpdir, "counts.txt")
          with open(fp, "w") as f:
              f.write(
                  '{"word": "test", "word_id": 0, "count": 1, "prob": 1, "cumprob": 1, "bin": "frequent"}'
              )
          opt = {
              "model": "projects.dialogue_unlikelihood.agents:TransformerSequenceVocabUnlikelihoodAgent",
              "load_from_checkpoint": False,
              "task": "convai2",
              "max_train_steps": 10,
              "validation_max_exs": 64,
              "batchsize": 16,
              "truncate": 32,
              "short_final_eval": True,
              "label_truncate": 256,
              "counts_file": fp,
          }
          testing_utils.train_model(opt)
  
file_path: ParlAI/tests/nightly/gpu/test_unlikelihood.py
imports: import os
  import unittest
  import parlai.utils.testing
label_desc: Use image node_id 2 for calling the TestUnlikelihood obj's underlying member method code with example usage: obj.test_train_model_vocab_ul() without return types