code: def forward(self, edge_attr):
      bond_embedding = 0
      for i in range(edge_attr.shape[1]):
          bond_embedding += self.bond_embedding_list[i](edge_attr[:, i])
  
      return bond_embedding
  
file_path: PGL/ogb_examples/lsc/PCQM4M/mol_encoder.py
imports: import paddle
  import paddle.nn
  from ogb.utils.features import get_atom_feature_dims, get_bond_feature_dims
label_desc: Use image node_id 2 for calling the BondEncoder obj's underlying member method code with example usage: obj.forward(edge_attr) and returns: bond_embedding