code: def test_single_proc_ring(self):
      id = nccl.get_unique_id()
      comm = nccl.NcclCommunicator(1, id, 0)
      assert 0 == comm.rank_id()
      comm.destroy()
  
file_path: cupy/tests/cupy_tests/cuda_tests/test_nccl.py
imports: import pickle
  import unittest
  import cupy
  from cupy import cuda
  from cupy.cuda import nccl
  from cupy import testing
label_desc: Use image node_id 1 for calling the TestNCCL obj's underlying member method code with example usage: obj.test_single_proc_ring() without return types