code: def test_triangular() -> None:
      assert isinstance(triangular(), tfp.bijectors.FillTriangular)
  
file_path: GPflow/tests/gpflow/utilities/test_bijectors.py
imports: from typing import Optional, Type
  import numpy
  import pytest
  import tensorflow
  import tensorflow_probability
  from gpflow.config import Config, as_context
  from gpflow.utilities import positive, triangular, triangular_size
label_desc: Use image node_id 4 for calling a global function with example usage: test_triangular() without return types