code: def test_dot_product_causal_attention_fast_inference(self):
      self._test_fast_inference(length=5)
  
file_path: trax/trax/models/research/configurable_transformer_test.py
imports: import functools
  from absl.testing import absltest
  from absl.testing import parameterized
  import numpy
  from trax import fastmath
  from trax import layers
  from trax import shapes
  from trax.layers import test_utils
  from trax.models.research import configurable_transformer
label_desc: Use image node_id 4 for calling the ConfigurableTransformerTest obj's underlying member method code with example usage: obj.test_dot_product_causal_attention_fast_inference() without return types