code: def tf_tol():
      """Numerical tolerance for equality tests."""
      return float(os.environ.get("TF_TOL", TF_TOL))
  
imports: import os
  import pathlib
  import numpy
  import pytest
  import pennylane
  from pennylane.devices import DefaultGaussian
label_desc: Use image node_id 3 for calling a global function with example usage: tf_tol() and returns: float