docstr: Warning, XX is now a list of previous xs, with x[0] being the last layer
code: def forward(self, multi_hop_graphs, XX, edge_attr):
      """Warning, XX is now a list of previous xs, with x[0] being the last layer"""
      result = (1 + self.eps[0]) * XX[0]
      for i, x in enumerate(XX):
          if i >= self.k:
              break
          if i == 0:
              msg = multi_hop_graphs[i + 1].send(
                  src_feat={"x": x},
                  edge_feat={"e": edge_attr},
                  message_func=self.send_add_edge,
              )
          else:
              msg = multi_hop_graphs[i + 1].send(
                  src_feat={"x": x}, message_func=self.send_add_edge
              )
          out = multi_hop_graphs[i + 1].recv(
              msg=msg, reduce_func=self.recv_sum
          )
          result += (1 + self.eps[i + 1]) * out
      result = self.nn(result)
      return [result] + XX
  
imports: import paddle
  import paddle.nn
  import paddle.nn.functional
  import pgl
  import pgl.nn
  from pgl.nn import functional
  from mol_encoder import AtomEncoder, BondEncoder
label_desc: Use image node_id 4 for calling the GINEPLUS obj's underlying member method code with example usage: obj.forward(multi_hop_graphs, XX, edge_attr) and returns: unknown