text: from ezmodel.custom2.kernel import GaussianKernel
  from ezmodel.util.sample_from_func import linear_function
  
  
  # create some data to test this model on
  X, y, _X, _y = linear_function(50, 200, noise=1, n_var=1)
  
  
  kernel = GaussianKernel(tail="linear")
  
  R = kernel.R(X)
  
  