class_docstr: Responsible for deduping the serialization/upload of object references.
class_docstr_tok: ["Responsible","for","deduping","the","serialization\/upload","of","object","references","."]
code: def __init__(self):
      self._uploads: Dict[ray.ObjectRef, Upload] = {}
      self._num_uploads = 0
  
imports: import contextlib
  from dataclasses import dataclass
  import logging
  import os
  import ray
  from ray import cloudpickle
  from ray.types import ObjectRef
  from ray.workflow import common, workflow_storage
  from typing import Any, Dict, Generator, List, Optional, Tuple, TYPE_CHECKING
  from collections import ChainMap
  import io
label_desc: Use image node_id 1 to create a new Manager object  with example: obj = Manager()