code: def three_by_three_volume():
      return np.pi**2 / 2.0
  
file_path: probability/tensorflow_probability/python/distributions/internal/correlation_matrix_volumes_test.py
imports: import numpy
  import tensorflow.compat.v2
  from tensorflow_probability.python.distributions.internal import correlation_matrix_volumes_lib
  from tensorflow_probability.python.distributions.internal import statistical_testing
  from tensorflow_probability.python.internal import test_util
label_desc: Use image node_id 2 for calling a global function with example usage: three_by_three_volume() and returns: unknown