code: def setUp(self):
      common_init(self)
      self.scale = 4.0
      self.overflow_buf = torch.cuda.IntTensor(1).zero_()
      self.ref = torch.cuda.FloatTensor([1.0])
  
file_path: apex/tests/L0/run_amp/test_multi_tensor_scale.py
imports: import unittest
  import functools
  import itertools
  from apex import amp
  import torch
  from torch import nn
  import torch.nn.functional
  from utils import common_init, HALF, FLOAT, ALWAYS_HALF, ALWAYS_FLOAT, MATCH_INPUT
label_desc: Use image node_id 1 for calling the TestMultiTensorScale obj's underlying member method code with example usage: obj.setUp() without return types