code: def _mangle_user(name):
      """Mangle user variable name"""
      return f"__user_{name}"
  
imports: import functools
  from typing import Any, Dict
  import cupy
  from numba import cuda
  from numba.core.utils import pysignature
  import cudf
  from cudf import _lib
  from cudf.core.buffer import acquire_spill_lock
  from cudf.core.column import column
  from cudf.utils import utils
  from cudf.utils._numba import _CUDFNumbaConfig
  from cudf.utils.docutils import docfmt_partial
label_desc: Use image node_id 8 for calling a global function with example usage: _mangle_user(name) and returns: str, name