code: def test_mod(self):
      f, g = self.f, self.g
  
      self.check_constant_output(f % g, 3.0 % 2.0)
      self.check_constant_output(f % 2.0, 3.0 % 2.0)
      self.check_constant_output(g % f, 2.0 % 3.0)
  
      self.check_constant_output((f + g) % 2, (3.0 + 2.0) % 2)
      self.check_constant_output(2 % (f + g), 2 % (3.0 + 2.0))
  
      self.check_constant_output(f % (f % g), 3.0 % (3.0 % 2.0))
      self.check_constant_output((f % f) % g, (3.0 % 3.0) % 2.0)
  
      self.check_constant_output((f + g) % (f * g), 5.0 % 6.0)
  
imports: from itertools import permutations
  from operator import add, ge, gt, le, lt, methodcaller, mul, ne, sub
  from string import ascii_uppercase
  from unittest import TestCase
  import numpy
  from numpy import arange, array, eye, float64, full, isnan, zeros
  from pandas import DataFrame, date_range, Int64Index
  from catalyst.pipeline import Factor, Filter
  from catalyst.pipeline.expression import NumericalExpression, NUMEXPR_MATH_FUNCS
  from catalyst.testing import check_allclose
  from catalyst.utils.numpy_utils import datetime64ns_dtype, float64_dtype
label_desc: Use image node_id 16 for calling the NumericalExpressionTestCase obj's underlying member method code with example usage: obj.test_mod() without return types