code: def test_get_model_parallel_src_rank():
      spawn_for_all_world_sizes(run_test_get_model_parallel_src_rank)
  
imports: import torch
  from fairscale.fair_dev.testing.testing import dist_init, spawn_for_all_world_sizes
  from fairscale.nn.model_parallel import initialize
label_desc: Use image node_id 4 for calling a global function with example usage: test_get_model_parallel_src_rank() without return types