code: def model_creator(config):
      """Returns a torch.nn.Module object."""
      return nn.Linear(1, config.get("hidden_size", 1))
  
file_path: BigDL/python/orca/example/learn/horovod/pytorch_estimator.py
imports: import argparse
  import numpy
  import torch
  import torch.nn
  from bigdl.orca import init_orca_context, stop_orca_context
  from bigdl.orca.learn.pytorch import Estimator
label_desc: Use image node_id 1 for calling a global function with example usage: model_creator(config) and returns: nn