embedding_size: 64              # (int) The initial embedding size of users, relations and entities.
n_iter: 1                       # (int) The number of iterations when computing entity representation.
aggregator: 'sum'               # (str) The aggregator for GNN ranging in ['sum', 'neighbor', 'concat'].
reg_weight: 1e-7                # (float) The L2 regularization weight.
neighbor_sample_size: 4         # (int) The number of neighbors to be sampled.
ls_weight: 0.5                  # (float) The label smoothness regularization weight. 