biased_mf.py

# Copyright 2018 The Cornac Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ============================================================================
"""Example for Matrix Factorization with biases"""

import cornac
from cornac.datasets import movielens
from cornac.eval_methods import RatioSplit


# Load MovieLens 1M ratings
ml_1m = movielens.load_feedback(variant="1M")

# Define an evaluation method to split feedback into train and test sets
ratio_split = RatioSplit(
    data=ml_1m, test_size=0.2, exclude_unknowns=False, verbose=True
)

# Instantiate the global average baseline and MF model
global_avg = cornac.models.GlobalAvg()
mf = cornac.models.MF(
    k=10,
    max_iter=25,
    learning_rate=0.01,
    lambda_reg=0.02,
    use_bias=True,
    early_stop=True,
    verbose=True,
)

# Instantiate MAE and RMSE for evaluation
mae = cornac.metrics.MAE()
rmse = cornac.metrics.RMSE()

# Put everything together into an experiment and run it
cornac.Experiment(
    eval_method=ratio_split,
    models=[global_avg, mf],
    metrics=[mae, rmse],
    user_based=True,
).run()