code: def test_nanvar_float16(self, xp):
      a = testing.shaped_arange((4, 5), xp, numpy.float16)
      a[0][0] = xp.nan
      return xp.nanvar(a, axis=0)
  
imports: import math
  import numpy
  import pytest
  import cupy
  from cupy import testing
label_desc: Use image node_id 3 for calling the TestNanVarStdAdditional obj's underlying member method code with example usage: obj.test_nanvar_float16(xp) and returns: xp