code: def setUp(self):
      common_init(self)
  
      self.a = 2.0
      self.b = 8.0
      self.xval = 4.0
      self.yval = 16.0
      self.overflow_buf = torch.cuda.IntTensor(1).zero_()
      self.ref = torch.full(
          (1,), 136.0, device="cuda", dtype=torch.float32
      )
  
file_path: apex/tests/L0/run_amp/test_multi_tensor_axpby.py
imports: import unittest
  import functools
  import itertools
  from apex import amp
  import torch
  from torch import nn
  import torch.nn.functional
  from math import floor
  from utils import common_init, HALF, FLOAT, ALWAYS_HALF, ALWAYS_FLOAT, MATCH_INPUT
label_desc: Use image node_id 1 for calling the TestMultiTensorAxpby obj's underlying member method code with example usage: obj.setUp() without return types