class_docstr: Manages a PyTorch model for training.
code: def get_node_ip_port(self):
      ip = self.get_node_ip()
      port = find_free_port()
      return ip, port
  
file_path: BigDL/python/orca/src/bigdl/orca/learn/pytorch/pytorch_ray_worker.py
imports: import ray
  import copy
  from bigdl.orca.learn.pytorch.utils import find_free_port
  from bigdl.orca.learn.pytorch.torch_runner import TorchRunner
  import torch.nn
  from torch.utils.data import IterableDataset
  import logging
  from bigdl.dllib.utils.log4Error import *
label_desc: Use image node_id 3 for calling the PytorchRayWorker obj's underlying member method code with example usage: obj.get_node_ip_port() and returns: ip,  port