docstr: Tests the creation of the vocab.
docstr_tok: ["Tests","the","creation","of","the","vocab","."]
code: def test_vocab_creation(self):
      """Tests the creation of the vocab."""
      vocabs = input_pipeline.create_vocabs(self._filename)
      self.assertEqual(
          vocabs["forms"],
          {
              "<p>": 0,
              "<u>": 1,
              "<r>": 2,
              "They": 3,
              "buy": 4,
              "books": 5,
              ".": 6,
              "NY": 7,
          },
      )
  
file_path: flax/examples/nlp_seq/input_pipeline_test.py
imports: import os
  from absl.testing import absltest
  import jax
  import tensorflow
  import input_pipeline
label_desc: Use image node_id 2 for calling the InputPipelineTest obj's underlying member method code with example usage: obj.test_vocab_creation() without return types