code: def chunk(self):
      return self._chunk
  
file_path: mars/mars/core/entity/fuse.py
imports: import numpy
  from ...serialization.serializables import ReferenceField
  from .chunks import ChunkData, Chunk, CHUNK_TYPE
label_desc: Use image node_id 2 for calling the FuseChunkData obj's underlying member method code with example usage: obj.chunk() and returns: self