code: def _init_artifact(self, artifact_id: str) -> None:
      self._artifacts[artifact_id] = {
          "finalize": False,
          "pending_count": 0,
          "commit_requested": False,
          "pre_commit_callbacks": set(),
          "result_futures": set(),
      }
  
imports: import asyncio
  import concurrent.futures
  import logging
  import queue
  import sys
  import threading
  from typing import TYPE_CHECKING, Awaitable, Callable, MutableMapping, MutableSequence, MutableSet, NamedTuple, Optional, Union
  from wandb.errors.term import termerror
  from wandb.filesync import upload_job
  from wandb.sdk.lib.paths import LogicalPath
label_desc: Use image node_id 8 for calling the StepUpload obj's underlying member method code with example usage: obj._init_artifact(artifact_id) without return types