code: def to_backend(ddf: _Frame, backend: str | None = None, **kwargs):
      """Move a DataFrame collection to a new backend
  
      Parameters
      ----------
      ddf : DataFrame, Series, or Index
          The input dataframe collection.
      backend : str, Optional
          The name of the new backend to move to. The default
          is the current "dataframe.backend" configuration.
  
      Returns
      -------
      dask.DataFrame, dask.Series or dask.Index
          A new dataframe collection with the backend
          specified by ``backend``.
      """
      # Get desired backend
      backend = backend or dataframe_creation_dispatch.backend
      # Check that "backend" has a registered entrypoint
      backend_entrypoint = dataframe_creation_dispatch.dispatch(backend)
      # Call `DataFrameBackendEntrypoint.to_backend`
      return backend_entrypoint.to_backend(ddf, **kwargs)
  
imports: from __future__ import annotations
  from collections.abc import Iterable
  from functools import partial
  from math import ceil
  from operator import getitem
  from threading import Lock
  from typing import TYPE_CHECKING, Literal, overload
  import numpy
  import pandas
  import dask.array
  from dask.base import is_dask_collection, tokenize
  from dask.blockwise import BlockwiseDepDict, blockwise
  from dask.dataframe._compat import is_any_real_numeric_dtype
  from dask.dataframe.backends import dataframe_creation_dispatch
  from dask.dataframe.core import DataFrame, Index, Series, _concat, _emulate, _Frame, apply_and_enforce, has_parallel_type, new_dd_object
  from dask.dataframe.dispatch import meta_lib_from_array
  from dask.dataframe.io.utils import DataFrameIOFunction
  from dask.dataframe.utils import check_meta, insert_meta_param_description, is_series_like, make_meta
  from dask.delayed import Delayed, delayed
  from dask.highlevelgraph import HighLevelGraph
  from dask.layers import DataFrameIOLayer
  from dask.utils import M, funcname, is_arraylike
label_desc: Use image node_id 16 for calling a global function with example usage: to_backend(ddf, backend) and returns: backend_entrypoint