code: def forward(self, nodes):
      m = nodes.data["m"]
      return {
          "h": F.relu(self.W_o(torch.cat([nodes.data["x"], m], 1))),
      }
  
imports: import dgl
  import dgl.function
  import rdkit.Chem
  import torch
  import torch.nn
  import torch.nn.functional
  from dgl import line_graph, mean_nodes
  from .chemutils import get_mol
label_desc: Use image node_id 2 for calling the GatherUpdate obj's underlying member method code with example usage: obj.forward(nodes) and returns: dict