code: def __init__(self):
      self._builder = None
      self._empty_block = None
  
file_path: ray/python/ray/data/_internal/delegating_block_builder.py
imports: import collections
  from typing import Any, Mapping
  from ray.data._internal.arrow_block import ArrowBlockBuilder
  from ray.data._internal.block_builder import BlockBuilder
  from ray.data._internal.pandas_block import PandasBlockBuilder
  from ray.data.block import Block, BlockAccessor, DataBatch
label_desc: Use image node_id 1 to create a new DelegatingBlockBuilder object from inherited base classes: BlockBuilder with example: obj = DelegatingBlockBuilder()