class_docstr: TorchServe 1.0 Model Loader
code: def _load_default_envelope(self, envelope):
      module_name = ".{0}".format(envelope)
      module = importlib.import_module(
          module_name, "ts.torch_handler.request_envelope"
      )
      envelope_class = list_classes_from_module(module)[0]
      return envelope_class
  
imports: import importlib
  import json
  import logging
  import os
  import uuid
  from abc import ABCMeta, abstractmethod
  from builtins import str
  from typing import Optional
  from ts.metrics.metric_cache_yaml_impl import MetricsCacheYamlImpl
  from ts.service import Service
  from .utils.util import list_classes_from_module
label_desc: Use image node_id 4 for calling the TsModelLoader obj's underlying member method code with example usage: obj._load_default_envelope(envelope) and returns: envelope_class