code: def _generate_instance_name(self):
      return "studioml_worker_" + str(uuid.uuid4())
  
imports: import uuid
  import os
  import base64
  import json
  import yaml
  import six
  import filelock
  import hashlib
  import pickle
  from studio import git_util
  from studio.util import logs
  from studio.storage import storage_util
  from studio.util.gpu_util import memstr2int
  from .cloud_worker_util import insert_user_startup_script
label_desc: Use image node_id 7 for calling the EC2WorkerManager obj's underlying member method code with example usage: obj._generate_instance_name() and returns: unknown