code: def rel_diff_t(xx1, xx2):
      return (
          (xx1 - xx2).norm(p=2, dtype=torch.float32)
          / (xx1 + xx2).norm(p=2, dtype=torch.float32)
      ).item()
  
imports: import unittest
  import torch
  from torch.testing._internal import common_utils
  from apex.transformer.testing.distributed_test_base import NcclDistributedTestBase
label_desc: Use image node_id 4 for calling a global function with example usage: rel_diff_t(xx1, xx2) and returns: unknown