code: def _brdf_normalization_factor(
      shininess: type_alias.TensorLike,
  ) -> tf.Tensor:
      """Returns the normalization factor needed to ensure energy conservation."""
      return (shininess + 2.0) / (2.0 * math.pi)
  
file_path: graphics/tensorflow_graphics/rendering/reflectance/phong.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import math
  import tensorflow
  from tensorflow_graphics.math import vector
  from tensorflow_graphics.util import asserts
  from tensorflow_graphics.util import export_api
  from tensorflow_graphics.util import shape
  from tensorflow_graphics.util import type_alias
label_desc: Use image node_id 1 for calling a global function with example usage: _brdf_normalization_factor(shininess) and returns: unknown