code: def message(self, x_j, edge_attr):
      return F.relu(x_j + edge_attr)
  
imports: import torch
  from torch_geometric.nn import MessagePassing
  import torch.nn.functional
  from torch_geometric.nn import global_mean_pool, global_add_pool
  from torch_geometric.utils import degree
  import math
label_desc: Use image node_id 3 for calling the GINConv obj's underlying member method code with example usage: obj.message(x_j, edge_attr) and returns: F