code: def build_callbacks(self):
      callbacks = {"tb": TensorboardWriter(self.writer)}
      if self.neox_args.eval_tasks:
          callbacks["eval_tasks"] = EvalHarness(
              self.model, megatron_train.forward_step, self.neox_args
          )
      if self.args.search_world_size:
          callbacks["early_stopping"] = EarlyStoppingCallback(self)
      return callbacks
  
imports: import logging
  import pathlib
  import traceback
  from datetime import datetime
  import deepspeed
  import megatron.training
  import megatron.utils
  import torch
  from attrdict import AttrMap
  from det_utils import EarlyStoppingCallback, EvalHarness, LMReducers, TensorboardWriter, get_neox_args
  from megatron import mpu
  from megatron.checkpointing import load_checkpoint, save_checkpoint
  from megatron.data.data_utils import build_datasets_from_neox_args
  from determined import LOG_FORMAT, InvalidHP
  from determined.pytorch import DataLoader
  from determined.pytorch.deepspeed import DeepSpeedTrial, DeepSpeedTrialContext, ModelParallelUnit
label_desc: Use image node_id 3 for calling the GPT2Trial obj's underlying member method code with example usage: obj.build_callbacks() and returns: callbacks