First exampleΒΆ
This example will show you how to run your very first experiment using Cornac.
import cornac as cn
# Load MovieLens 100K dataset
ml_100k = cn.datasets.movielens.load_100k()
# Split data based on ratio
ratio_split = cn.eval_methods.RatioSplit(data=ml_100k,
test_size=0.2,
rating_threshold=4.0,
seed=123)
# Here we are comparing: Biased MF, PMF, and BPR
mf = cn.models.MF(k=10, max_iter=25, learning_rate=0.01, lambda_reg=0.02, use_bias=True)
pmf = cn.models.PMF(k=10, max_iter=100, learning_rate=0.001, lamda=0.001)
bpr = cn.models.BPR(k=10, max_iter=200, learning_rate=0.01, lambda_reg=0.01)
# Define metrics used to evaluate the models
mae = cn.metrics.MAE()
rmse = cn.metrics.RMSE()
rec_20 = cn.metrics.Recall(k=20)
ndcg_20 = cn.metrics.NDCG(k=20)
auc = cn.metrics.AUC()
# Put it together into an experiment and run
exp = cn.Experiment(eval_method=ratio_split,
models=[mf, pmf, bpr],
metrics=[mae, rmse, rec_20, ndcg_20, auc],
user_based=True)
exp.run()
Output:
MAE | RMSE | Recall@20 | NDCG@20 | AUC | Train (s) | Test (s) | |
---|---|---|---|---|---|---|---|
MF | 0.7441 | 0.9007 | 0.0622 | 0.0534 | 0.2952 | 0.0736 | 8.1187 |
PMF | 0.7493 | 0.9084 | 0.0835 | 0.0673 | 0.4749 | 358.7642 | 8.4184 |
BPR | 1.5595 | 1.8864 | 0.0744 | 0.0657 | 0.5932 | 2.5395 | 8.5734 |