Python wrapper for libffm

This is a python wrapped for LibFFM library writen in C++

Installing it:

make so
mv libffm.so ffm
python setup.py install

Using it:

import ffm
from sklearn.metrics import roc_auc_score

# prepare the data
# (field, index, value) format

X = [[(1, 2, 1), (2, 3, 1), (3, 5, 1)],
     [(1, 0, 1), (2, 3, 1), (3, 7, 1)],
     [(1, 1, 1), (2, 3, 1), (3, 7, 1), (3, 9, 1)],]

y = [1, 1, 0]

ffm_data = ffm.FFMData(X, y)
ffm_data_test = ffm.FFMData(X,y)

# train the model for 10 iterations

n_iter = 10

model = ffm.FFM(eta=0.1, lam=0.0001, k=4)
model.init_model(ffm_data)

for i in range(n_iter):
    print('iteration %d, ' % i, end='')
    model.iteration(ffm_data)

    prediction = model.predict(ffm_data_test)
    y_pred = prediction.pred
    auc = roc_auc_score(y, y_pred)
    print('train auc %.4f' % auc)


# save the model
model.save_model('ololo.bin')

# load it to reuse the model
model = ffm.read_model('ololo.bin')