code: def test_fp16_overflow_cpu(self):
      self.check_fp16_overflow(numpy)
  
imports: import unittest
  import numpy
  import chainer
  from chainer.backends import cuda
  from chainer import functions
  from chainer import testing
  from chainer import utils
  from chainer.testing import attr
  from chainer.utils import type_check
label_desc: Use image node_id 2 for calling the TestMeanAbsoluteErrorFP16Overflow obj's underlying member method code with example usage: obj.test_fp16_overflow_cpu() without return types