code: def _init_model_parallel(self):
      parallel_state.initialize_model_parallel(
          tensor_model_parallel_size_=1,
          pipeline_model_parallel_size_=self.world_size,
          virtual_pipeline_model_parallel_size_=None,
      )
  
file_path: apex/tests/L0/run_transformer/test_p2p_comm.py
imports: import logging
  import unittest
  import torch
  from torch.testing._internal import common_utils
  from apex.transformer import parallel_state
  from apex.transformer.pipeline_parallel import p2p_communication
  from apex.transformer.testing.distributed_test_base import NcclDistributedTestBase
  from apex.transformer.testing.distributed_test_base import UccDistributedTestBase
label_desc: Use image node_id 2 for calling the P2PCommTestBase obj's underlying member method code with example usage: obj._init_model_parallel() without return types