code: def test_rbf_epsilon_none():
      x = linspace(0, 10, 9)
      y = sin(x)
      Rbf(x, y, epsilon=None)
  
imports: import numpy
  from numpy.testing import assert_, assert_array_almost_equal, assert_almost_equal
  from numpy import linspace, sin, cos, random, exp, allclose
  from scipy.interpolate._rbf import Rbf
label_desc: Use image node_id 18 for calling a global function with example usage: test_rbf_epsilon_none() without return types