code: def __init__(self):
      super().__init__()
      self.loss_fn = nn.CrossEntropyLoss()
  
imports: import argparse
  import time
  from functools import partial
  import torch
  from model_zoo import model_builder
  from torch import nn
  from colossalai.fx import ColoTracer
  from colossalai.fx.passes.adding_split_node_pass import gpipe_dp_split_pass, split_with_split_nodes_pass
  from colossalai.fx.passes.meta_info_prop import MetaInfoProp
  from colossalai.legacy.pipeline.middleware.adaptor import get_fx_topology
  from colossalai.legacy.pipeline.rpc._pipeline_schedule import FillDrainPipelineEngine
  from colossalai.legacy.pipeline.rpc.utils import rpc_run
  from colossalai.logging import disable_existing_loggers, get_dist_logger
label_desc: Use image node_id 1 to create a new GPTLMLoss object from inherited base classes: nn with example: obj = GPTLMLoss()