code: def _propagate_mean(matrix, mean, added_mean):
      return tf.linalg.matvec(matrix, mean) + added_mean
  
imports: import collections
  import functools
  import numpy
  import tensorflow.compat.v2
  from tensorflow_probability.python.distributions import mvn_tril
  from tensorflow_probability.python.internal import dtype_util
  from tensorflow_probability.python.internal import prefer_static
  from tensorflow_probability.python.internal import samplers
  from tensorflow_probability.python.math import linalg
  from tensorflow_probability.python.math.scan_associative import scan_associative
label_desc: Use image node_id 15 for calling a global function with example usage: _propagate_mean(matrix, mean, added_mean) and returns: unknown