code: def rel_diff(A, B):
      return abs(A - B) / abs(A)
  
file_path: H2O/h2o_flexgen/benchmark/third_party/DeepSpeed/tests/unit/runtime/pipe/test_pipe.py
imports: import copy
  import torch.nn
  import pytest
  import deepspeed.comm
  from deepspeed.runtime.pipe.topology import PipeDataParallelTopology
  from deepspeed.runtime.pipe.module import PipelineModule
  from unit.alexnet_model import AlexNetPipe, train_cifar
  from unit.common import DistributedTest
label_desc: Use image node_id 1 for calling a global function with example usage: rel_diff(A, B) and returns: unknown