docstr: Save checkpoint.
docstr_tok: ["Save","checkpoint","."]
code: def save_checkpoint(self, filepath, save_weights_only=False):
      """Save checkpoint."""
      pass
  
file_path: BigDL/python/orca/src/bigdl/orca/learn/pytorch/core/modelIO.py
imports: import os
  import io
  import shutil
  import tempfile
  from abc import ABCMeta, abstractmethod
  import torch
  from bigdl.dllib.utils.log4Error import invalidInputError
label_desc: Use image node_id 3 for calling the ModelIO obj's underlying member method code with example usage: obj.save_checkpoint(filepath, save_weights_only) without return types