message: fix set_env bug of omp_num_threads
diff: @@ -582,7 +582,7 @@ class DistributedTrainingLauncher(Launcher):
  cores_per_rank = total_cores_per_node // ppn
  omp_num_threads = cores_per_rank - args.ccl_worker_count
  - self.set_env("OMP_NUM_THREADS", omp_num_threads)
  + self.set_env("OMP_NUM_THREADS", str(omp_num_threads))
  omp_num_threads = os.environ["OMP_NUM_THREADS"]
  self.set_multi_thread_and_allocator(omp_num_threads,
  args.disable_iomp,
  