code: def _set_fill_value(x, fill_value):
      if isinstance(x, np.ma.masked_array):
          x = x.copy()
          np.ma.set_fill_value(x, fill_value=fill_value)
      return x
  
imports: from __future__ import annotations
  from functools import wraps
  import numpy
  from dask.array import chunk
  from dask.array.core import asanyarray, blockwise, elemwise, map_blocks
  from dask.array.reductions import reduction
  from dask.array.routines import _average
  from dask.array.routines import nonzero
  from dask.base import normalize_token
  from dask.utils import derived_from
label_desc: Use image node_id 15 for calling a global function with example usage: _set_fill_value(x, fill_value) and returns: x