code: def apply_node_func(nodes):
      return {"h": nodes.data["h"] + nodes.data["accum"]}
  
imports: import warnings
  from collections import defaultdict
  import backend
  import dgl
  import networkx
  import numpy
  from utils import parametrize_idtype
label_desc: Use image node_id 3 for calling a global function with example usage: apply_node_func(nodes) and returns: dict