code: def laplace(
      x: TensorType, mu: TensorType, sigma: TensorType
  ) -> tf.Tensor:
      return -tf.abs(mu - x) / sigma - tf.math.log(2.0 * sigma)
  
file_path: GPflow/gpflow/logdensities.py
imports: import numpy
  import tensorflow
  from check_shapes import check_shapes
  from .base import TensorType
  from .utilities import to_default_float
label_desc: Use image node_id 9 for calling a global function with example usage: laplace(x, mu, sigma) and returns: unknown