code: def forward(self, g, nids):
      return self.rgcn(g, nids)
  
imports: import dgl
  import numpy
  import torch
  import torch.nn
  import torch.nn.functional
  import tqdm
  from dgl.data.knowledge_graph import FB15k237Dataset
  from dgl.dataloading import GraphDataLoader
  from dgl.nn.pytorch import RelGraphConv
label_desc: Use image node_id 3 for calling the LinkPredict obj's underlying member method code with example usage: obj.forward(g, nids) and returns: self