FlexMF Logistic

This page analyzes the hyperparameter tuning results for the FlexMF scorer in implicit-feedback mode with logistic loss (Logistic Matrix Factorization).

Parameter Search Space

/home/mde48/lenskit/lenskit-codex/.venv/lib/python3.12/site-packages/ray/tune/search/sample.py:700: RayDeprecationWarning: The `base` argument is deprecated. Please remove it as it is not actually needed in this method.

Parameter	Type	Distribution	Values	Selected
embedding_size	Integer	LogUniform	4 ≤ \(x\) ≤ 512	130
regularization	Float	LogUniform	0.0001 ≤ \(x\) ≤ 10	0.0625
learning_rate	Float	LogUniform	0.001 ≤ \(x\) ≤ 0.1	0.00235
reg_method	Categorical	Uniform	L2, AdamW	AdamW
negative_count	Integer	Uniform	1 ≤ \(x\) ≤ 5	3
positive_weight	Float	Uniform	1 ≤ \(x\) ≤ 10	5.55
user_bias	Categorical	Uniform	True, False	False
item_bias	Categorical	Uniform	True, False	True

Final Result

Searching selected the following configuration:

{
    'embedding_size': 130,
    'regularization': 0.06254722563846132,
    'learning_rate': 0.002348262652167187,
    'reg_method': 'AdamW',
    'negative_count': 3,
    'positive_weight': 5.551829597025691,
    'user_bias': False,
    'item_bias': True,
    'epochs': 10
}

With these metrics:

{
    'RBP': 0.1763513697213253,
    'DCG': 11.466147341874354,
    'NDCG': 0.42159244735845863,
    'RecipRank': 0.33826189606414603,
    'Hit10': 0.5797829036635007,
    'max_epochs': 50,
    'epoch_train_s': 29.1736630230007,
    'epoch_measure_s': 14.4465691660007,
    'done': True,
    'training_iteration': 10,
    'trial_id': 'accd2f14',
    'date': '2025-07-29_01-18-40',
    'timestamp': 1753766320,
    'time_this_iter_s': 43.62479782104492,
    'time_total_s': 881.3234508037567,
    'pid': 210957,
    'hostname': 'CCI-ws21',
    'node_ip': '10.248.127.152',
    'config': {
        'embedding_size': 130,
        'regularization': 0.06254722563846132,
        'learning_rate': 0.002348262652167187,
        'reg_method': 'AdamW',
        'negative_count': 3,
        'positive_weight': 5.551829597025691,
        'user_bias': False,
        'item_bias': True,
        'epochs': 10
    },
    'time_since_restore': 43.62479782104492,
    'iterations_since_restore': 1
}