def test01_most_similar(self):
set_log_level(2)
data_opt = self.get_ml100k_mm_opt()
opt = ALSOption().get_default_option()
opt.d = 20
opt.num_workers = 1
als = ALS(opt, data_opt=data_opt)
als.initialize()
als.train()
pals = ParALS(als)
random_keys = [
k for k, _ in als.most_similar('49.Star_Wars_(1977)', topk=128)
]
random_indexes = als.get_index_pool(random_keys)
naive = [als.most_similar(k, topk=10) for k in random_keys]
topks0 = [[k for k, _ in result] for result in naive]
scores0 = np.array([[v for _, v in result] for result in naive])
self.assertEqual(scores0.shape, (
128,
10,
), msg='check even size')
scores0 = scores0.reshape(len(naive), 10)
pals.num_workers = 1
topks1, scores1 = pals.most_similar(random_keys, topk=10, repr=True)
topks2, scores2 = pals.most_similar(random_indexes, topk=10, repr=True)
for a, b in combinations([topks0, topks1, topks2], 2):
self.assertEqual(a, b)
for a, b in combinations([scores0, scores1, scores2], 2):
self.assertTrue(np.allclose(a, b))
def example1():
log.set_log_level(log.DEBUG)
als_option = ALSOption().get_default_option()
als_option.validation = aux.Option({'topk': 10})
data_option = MatrixMarketOptions().get_default_option()
data_option.input.main = '../tests/ext/ml-100k/main'
data_option.input.iid = '../tests/ext/ml-100k/iid'
als = ALS(als_option, data_opt=data_option)
als.initialize()
als.train()
print('MovieLens 100k metrics for validations\n%s' % json.dumps(als.get_validation_results(), indent=2))
print('Similar movies to Star_Wars_(1977)')
for rank, (movie_name, score) in enumerate(als.most_similar('49.Star_Wars_(1977)')):
print(f'{rank + 1:02d}. {score:.3f} {movie_name}')
print('Run hyper parameter optimization for val_ndcg...')
als.opt.num_workers = 4
als.opt.evaluation_period = 10
als.opt.optimize = aux.Option({
'loss': 'val_ndcg',
'max_trials': 100,
'deployment': True,
'start_with_default_parameters': True,
'space': {
'd': ['randint', ['d', 10, 128]],
'reg_u': ['uniform', ['reg_u', 0.1, 1.0]],
'reg_i': ['uniform', ['reg_i', 0.1, 1.0]],
'alpha': ['randint', ['alpha', 1, 10]],
}
})
log.set_log_level(log.INFO)
als.opt.model_path = './example1.ml100k.als.optimize.bin'
print(json.dumps({'alpha': als.opt.alpha, 'd': als.opt.d,
'reg_u': als.opt.reg_u, 'reg_i': als.opt.reg_i}, indent=2))
als.optimize()
als.load('./example1.ml100k.als.optimize.bin')
print('Similar movies to Star_Wars_(1977)')
for rank, (movie_name, score) in enumerate(als.most_similar('49.Star_Wars_(1977)')):
print(f'{rank + 1:02d}. {score:.3f} {movie_name}')
optimization_res = als.get_optimization_data()
best_parameters = optimization_res['best_parameters']
print(json.dumps(optimization_res['best'], indent=2))
print(json.dumps({'alpha': int(best_parameters['alpha']), 'd': int(best_parameters['d']),
'reg_u': best_parameters['reg_u'], 'reg_i': best_parameters['reg_i']}, indent=2))
def test02_most_similar(self):
set_log_level(1)
data_opt = self.get_ml100k_mm_opt()
opt = ALSOption().get_default_option()
opt.d = 20
opt.num_workers = 1
als = ALS(opt, data_opt=data_opt)
als.initialize()
als.train()
als.build_itemid_map()
pals = ParALS(als)
all_keys = als._idmanager.itemids[::]
start_t = time.time()
[als.most_similar(k, topk=10) for k in all_keys]
naive_elapsed = time.time() - start_t
pals.num_workers = 4
start_t = time.time()
pals.most_similar(all_keys, topk=10, repr=True)
parals_elapsed = time.time() - start_t
self.assertTrue(naive_elapsed > parals_elapsed * 3.0)
