code: def dist_func(x1, x2):
      dist_module = gpytorch.kernels.kernel.Distance()
      return dist_module._dist(x1, x2)
  
file_path: gpytorch/test/functions/test_matern_covariance.py
imports: import math
  import unittest
  import torch
  import gpytorch
label_desc: Use image node_id 1 for calling a global function with example usage: dist_func(x1, x2) and returns: dist_module