code: def forward(self, graph, node_feat):
      raise NotImplementedError("KGLossBase: Not Implemented.")
  
file_path: graph4nlp/graph4nlp/pytorch/modules/loss/base.py
imports: import torch.nn
label_desc: Use image node_id 2 for calling the KGLossBase obj's underlying member method code with example usage: obj.forward(graph, node_feat) without return types