code: def process_chunks(
      self, chunks: List[Chunk]
  ) -> "ProcessedBinaryChunk":
      data = b"".join([c.data for c in chunks])
      enc = base64.b64encode(data).decode("ascii")
      self._offset += len(data)
      return {
          "offset": self._offset,
          "content": enc,
          "encoding": "base64",
      }
  
imports: import base64
  import functools
  import itertools
  import logging
  import os
  import queue
  import random
  import sys
  import threading
  import time
  from types import TracebackType
  from typing import TYPE_CHECKING, Any, Callable, Dict, List, NamedTuple, Optional, Set, Tuple, Type, Union
  import requests
  import wandb
  from wandb import util
  from wandb.sdk.internal import internal_api
  from ..lib import file_stream_utils
label_desc: Use image node_id 2 for calling the BinaryFilePolicy obj's underlying member method code with example usage: obj.process_chunks(chunks) and returns: dict