code: def serial(self, obj: Any, context: Dict):
      raw_header, raw_buffers = serialize(obj.raw, context)
      return (raw_header, obj.shape), raw_buffers, True
  
imports: from typing import Any, Dict, List
  from ..lib.sparse import SparseNDArray
  from .core import Serializer, serialize, deserialize, buffered
label_desc: Use image node_id 1 for calling the SparseNDArraySerializer obj's underlying member method code with example usage: obj.serial(obj, context) and returns: raw_header,  obj,  raw_buffers,  True