code: def recv_sum(self, msg):
      return msg.reduce_sum(msg["h"])
  
imports: import numpy
  import math
  import paddle
  import paddle.nn
  import paddle.nn.functional
  import paddle.distributed
  import pgl
  import pgl.nn
  from pgl.nn import functional
  from pgl.utils.logger import log
  import models.mol_encoder
label_desc: Use image node_id 3 for calling the CatGINConv obj's underlying member method code with example usage: obj.recv_sum(msg) and returns: msg