code: def to_protobuf(self):
      cls = SafePickle.dumps(self.cls)
      args = SafePickle.dumps(self.args)
      return ClassAndArgs(cls=cls, args=args)
  
file_path: BigDL/python/ppml/src/bigdl/ppml/fl/nn/utils.py
imports: import logging
  from bigdl.ppml.utils.safepickle import SafePickle
  import stat
  import numpy
  from bigdl.ppml.fl.nn.generated.nn_service_pb2 import *
  from bigdl.ppml.fl.nn.generated.fl_base_pb2 import FloatTensor, TensorMap
  import numpy
  from bigdl.dllib.utils.log4Error import invalidInputError
  from bigdl.ppml.fl.nn.generated.fl_base_pb2 import FloatTensor, TensorMap
label_desc: Use image node_id 2 for calling the ClassAndArgsWrapper obj's underlying member method code with example usage: obj.to_protobuf() and returns: ClassAndArgs