code: def get_partition_start(item):
      global mp_rank, mp_size, mp_group
      size = item.numel()
      partition_size = size / mp_size
      start = partition_size * mp_rank
      return int(start)
  
imports: import copy
  import torch
  import contextlib
  from deepspeed import comm
  import mmap
  from torch import _C
  from torch.cuda import _lazy_call, device
  from deepspeed.runtime.config import DeepSpeedConfig
  from deepspeed.utils import logger
  from deepspeed.runtime.utils import copy_to_device, move_to_device, see_memory_usage, bwc_tensor_model_parallel_rank
  from deepspeed.utils.timer import SynchronizedWallClockTimer
label_desc: Use image node_id 5 for calling a global function with example usage: get_partition_start(item) and returns: int