code: def forward(ctx, module, pre_backward_function, outputs):
      ctx.module = module
      ctx.pre_backward_function = pre_backward_function
      if not hasattr(module, "applied_pre_backward_ref_cnt"):
          module.applied_pre_backward_ref_cnt = 0
      module.applied_pre_backward_ref_cnt += 1
      # print(f"After Forward: {ctx.module.__class__.__name__}")
      outputs = outputs.detach()
      return outputs
  
imports: import sys
  import torch
  from collections import OrderedDict
  from deepspeed.runtime.utils import see_memory_usage
  from deepspeed.runtime.zero.offload_config import OffloadDeviceEnum
  from deepspeed.runtime.zero.partition_parameters import _init_external_params
  from deepspeed.runtime.zero.partition_parameters import *
  from deepspeed.runtime.zero.partitioned_param_coordinator import PartitionedParameterCoordinator, InflightParamRegistry, iter_params
  from deepspeed import comm
  from deepspeed.accelerator import get_accelerator
label_desc: Use image node_id 1 for calling the PreBackwardFunction obj's underlying member method code with example usage: obj.forward(ctx, module, pre_backward_function, outputs) and returns: outputs