def test_cv(self):
lgb_train, _ = template.test_template(return_data=True)
lgb.cv({'verbose': -1},
lgb_train,
num_boost_round=20,
nfold=5,
shuffle=False,
metrics='l1',
verbose_eval=False,
callbacks=[
lgb.reset_parameter(learning_rate=lambda i: 0.1 - 0.001 * i)
])
lgb.cv({'verbose': -1},
lgb_train,
num_boost_round=20,
nfold=5,
shuffle=True,
metrics='l1',
verbose_eval=False,
callbacks=[
lgb.reset_parameter(learning_rate=lambda i: 0.1 - 0.001 * i)
])
tss = TimeSeriesSplit(3)
lgb.cv(
{'verbose': -1},
lgb_train,
num_boost_round=20,
data_splitter=tss,
nfold=5, # test if wrong nfold is ignored
metrics='l2',
verbose_eval=False)
def get_predict_w(model, data, label='label', feature=[], cate_feature=[], random_state=2018, n_splits=5,
model_type='lgb'):
if 'sample_weight' not in data.keys():
data['sample_weight'] = 1
model.random_state = random_state
predict_label = 'predict_' + label
kfold = KFold(n_splits=n_splits, shuffle=True, random_state=random_state)
data[predict_label] = 0
test_index = (data[label].isnull()) | (data[label] == -1) #找到要预测的数据集
train_data = data[~test_index].reset_index(drop=True) #分割出预测集训练集
test_data = data[test_index]
for train_idx, val_idx in kfold.split(train_data):
model.random_state = model.random_state + 1
train_x = train_data.loc[train_idx][feature]
train_y = train_data.loc[train_idx][label]
test_x = train_data.loc[val_idx][feature]
test_y = train_data.loc[val_idx][label]
if model_type == 'lgb':
try:
model.fit(train_x, train_y, eval_set=[(test_x, test_y)], early_stopping_rounds=400,
eval_metric='mae',
callbacks=[lgb.reset_parameter(learning_rate=lambda iter: max(0.005, 0.5 * (0.99 ** iter)))],
categorical_feature=cate_feature,
sample_weight=train_data.loc[train_idx]['sample_weight'],
verbose=100)
except:
model.fit(train_x, train_y, eval_set=[(test_x, test_y)], early_stopping_rounds=200,
eval_metric='mae',
callbacks=[lgb.reset_parameter(learning_rate=lambda iter: max(0.005, 0.5 * (0.99 ** iter)))],
categorical_feature=cate_feature,
sample_weight=train_data.loc[train_idx]['sample_weight'],
verbose=100)
elif model_type == 'ctb':
model.fit(train_x, train_y, eval_set=[(test_x, test_y)], early_stopping_rounds=200,
# eval_metric='mae',
# callbacks=[lgb.reset_parameter(learning_rate=lambda iter: max(0.005, 0.5 * (0.99 ** iter)))],
cat_features=cate_feature,
sample_weight=train_data.loc[train_idx]['sample_weight'],
verbose=100)
train_data.loc[val_idx, predict_label] = model.predict(test_x)
if len(test_data) != 0: #预测集的预测
test_data[predict_label] = test_data[predict_label] + model.predict(test_data[feature])
test_data[predict_label] = test_data[predict_label] / n_splits
# print((train_data[label], train_data[predict_label]) * 5, train_data[predict_label].mean(),
# test_data[predict_label].mean())
# print('########################################')
return pd.concat([train_data, test_data], sort=True, ignore_index=True), predict_label
def test_lightgbm_ranking():
try:
import lightgbm
except:
print("Skipping test_lightgbm_ranking!")
return
import shap
import numpy as np
# train lightgbm ranker model
x_train, y_train, x_test, y_test, q_train, q_test = shap.datasets.rank()
model = lightgbm.LGBMRanker()
model.fit(
x_train,
y_train,
group=q_train,
eval_set=[(x_test, y_test)],
eval_group=[q_test],
eval_at=[1, 3],
early_stopping_rounds=5,
verbose=False,
callbacks=[
lightgbm.reset_parameter(learning_rate=lambda x: 0.95**x * 0.1)
])
_validate_shap_values(model, x_test)
def test_lambdarank(self):
X_train, y_train = load_svmlight_file(
os.path.join(os.path.dirname(os.path.realpath(__file__)),
'../../examples/lambdarank/rank.train'))
X_test, y_test = load_svmlight_file(
os.path.join(os.path.dirname(os.path.realpath(__file__)),
'../../examples/lambdarank/rank.test'))
q_train = np.loadtxt(
os.path.join(os.path.dirname(os.path.realpath(__file__)),
'../../examples/lambdarank/rank.train.query'))
q_test = np.loadtxt(
os.path.join(os.path.dirname(os.path.realpath(__file__)),
'../../examples/lambdarank/rank.test.query'))
gbm = lgb.LGBMRanker()
gbm.fit(X_train,
y_train,
group=q_train,
eval_set=[(X_test, y_test)],
eval_group=[q_test],
eval_at=[1, 3],
early_stopping_rounds=10,
verbose=False,
callbacks=[
lgb.reset_parameter(
learning_rate=lambda x: max(0.01, 0.1 - 0.01 * x))
])
self.assertLessEqual(gbm.best_iteration_, 25)
self.assertGreater(gbm.best_score_['valid_0']['ndcg@1'], 0.6333)
self.assertGreater(gbm.best_score_['valid_0']['ndcg@3'], 0.6048)
def test_lambdarank(self):
X_train, y_train = load_svmlight_file(
os.path.join(os.path.dirname(os.path.realpath(__file__)),
'../../examples/lambdarank/rank.train'))
X_test, y_test = load_svmlight_file(
os.path.join(os.path.dirname(os.path.realpath(__file__)),
'../../examples/lambdarank/rank.test'))
q_train = np.loadtxt(
os.path.join(os.path.dirname(os.path.realpath(__file__)),
'../../examples/lambdarank/rank.train.query'))
q_test = np.loadtxt(
os.path.join(os.path.dirname(os.path.realpath(__file__)),
'../../examples/lambdarank/rank.test.query'))
gbm = lgb.LGBMRanker()
gbm.fit(X_train,
y_train,
group=q_train,
eval_set=[(X_test, y_test)],
eval_group=[q_test],
eval_at=[1, 3],
early_stopping_rounds=5,
verbose=False,
callbacks=[
lgb.reset_parameter(learning_rate=lambda x: 0.95**x * 0.1)
])
def fit_lgb(x_tr, y_tr, x_va, y_va, cat_feats, args):
from lightgbm import Dataset
if args.clip_target != -1:
y_tr = y_tr.clip(upper=args.clip_target)
tr_ds = Dataset(x_tr, label=y_tr, free_raw_data=False)
if args.mode not in ['full', 'fold']:
va_ds = Dataset(x_va, label=y_va, free_raw_data=False)
valid_sets = [tr_ds, va_ds]
else:
valid_sets = [tr_ds]
params = {
'learning_rate': 0.02,
'max_depth': -1,
'boosting': 'gbdt',
'objective': 'regression',
'metric': 'rmse',
'is_training_metric': True,
'num_leaves': args.num_leaves,
'feature_fraction': 0.9,
'bagging_fraction': 0.7,
'lambda_l2': 0.7,
'bagging_freq': 5,
'seed': 42
}
kwargs = {
'train_set': tr_ds,
'categorical_feature': cat_feats,
'verbose_eval': args.verbose_eval,
'num_boost_round': args.num_boost_round,
}
if args.mode not in ['full', 'fold']:
kwargs['early_stopping_rounds'] = 200
kwargs['valid_sets'] = valid_sets
if args.lr_decay:
kwargs['callbacks'] = [
lgb.reset_parameter(
learning_rate=learning_rate_010_decay_power_0995)
]
m = lgb.train(params, **kwargs)
tr_pred = np.clip(m.predict(tr_ds.data), 0, 361)
tr_score = np.sqrt(mean_squared_error(tr_pred, tr_ds.label))
if args.mode not in ['full', 'fold']:
va_pred = np.clip(m.predict(va_ds.data), 0, 361)
va_score = np.sqrt(mean_squared_error(va_pred, va_ds.label))
else:
va_score = 0.
return m, tr_score, va_score
def test_lambdarank(self):
X_train, y_train = load_svmlight_file(os.path.join(os.path.dirname(os.path.realpath(__file__)), '../../examples/lambdarank/rank.train'))
X_test, y_test = load_svmlight_file(os.path.join(os.path.dirname(os.path.realpath(__file__)), '../../examples/lambdarank/rank.test'))
q_train = np.loadtxt(os.path.join(os.path.dirname(os.path.realpath(__file__)), '../../examples/lambdarank/rank.train.query'))
q_test = np.loadtxt(os.path.join(os.path.dirname(os.path.realpath(__file__)), '../../examples/lambdarank/rank.test.query'))
gbm = lgb.LGBMRanker()
gbm.fit(X_train, y_train, group=q_train, eval_set=[(X_test, y_test)],
eval_group=[q_test], eval_at=[1, 3], early_stopping_rounds=5, verbose=False,
callbacks=[lgb.reset_parameter(learning_rate=lambda x: 0.95 ** x * 0.1)])
def test_cv(self):
X, y = load_boston(True)
X_train, _, y_train, _ = train_test_split(X,
y,
test_size=0.1,
random_state=42)
params = {'verbose': -1}
lgb_train = lgb.Dataset(X_train, y_train)
# shuffle = False, override metric in params
params_with_metric = {'metric': 'l2', 'verbose': -1}
lgb.cv(params_with_metric,
lgb_train,
num_boost_round=10,
nfold=3,
stratified=False,
shuffle=False,
metrics='l1',
verbose_eval=False)
# shuffle = True, callbacks
lgb.cv(params,
lgb_train,
num_boost_round=10,
nfold=3,
stratified=False,
shuffle=True,
metrics='l1',
verbose_eval=False,
callbacks=[
lgb.reset_parameter(learning_rate=lambda i: 0.1 - 0.001 * i)
])
# self defined folds
tss = TimeSeriesSplit(3)
folds = tss.split(X_train)
lgb.cv(params_with_metric,
lgb_train,
num_boost_round=10,
folds=folds,
stratified=False,
verbose_eval=False)
# lambdarank
X_train, y_train = load_svmlight_file(
os.path.join(os.path.dirname(os.path.realpath(__file__)),
'../../examples/lambdarank/rank.train'))
q_train = np.loadtxt(
os.path.join(os.path.dirname(os.path.realpath(__file__)),
'../../examples/lambdarank/rank.train.query'))
params_lambdarank = {'objective': 'lambdarank', 'verbose': -1}
lgb_train = lgb.Dataset(X_train, y_train, group=q_train)
lgb.cv(params_lambdarank,
lgb_train,
num_boost_round=10,
nfold=3,
stratified=False,
metrics='l2',
verbose_eval=False)
def test_cv(self):
lgb_train, _ = template.test_template(return_data=True)
lgb.cv({'verbose': -1},
lgb_train,
num_boost_round=20,
nfold=5,
metrics='l1',
verbose_eval=False,
callbacks=[
lgb.reset_parameter(learning_rate=lambda i: 0.1 - 0.001 * i)
])
def test_reset_parameter_callback_is_picklable(serializer):
params = {
'bagging_fraction': [0.7] * 5 + [0.6] * 5,
'feature_fraction': reset_feature_fraction
}
callback = lgb.reset_parameter(**params)
callback_from_disk = pickle_and_unpickle_object(obj=callback,
serializer=serializer)
assert callback_from_disk.order == 10
assert callback_from_disk.before_iteration is True
assert callback.kwargs == callback_from_disk.kwargs
assert callback.kwargs == params
def test_lambdarank(self):
X_train, y_train = load_svmlight_file('../../examples/lambdarank/rank.train')
X_test, y_test = load_svmlight_file('../../examples/lambdarank/rank.test')
q_train = np.loadtxt('../../examples/lambdarank/rank.train.query')
q_test = np.loadtxt('../../examples/lambdarank/rank.test.query')
lgb_model = lgb.LGBMRanker().fit(X_train, y_train,
group=q_train,
eval_set=[(X_test, y_test)],
eval_group=[q_test],
eval_at=[1],
verbose=False,
callbacks=[lgb.reset_parameter(learning_rate=lambda x: 0.95 ** x * 0.1)])
def lightgbm_fitparams(**kwargs):
fit_params = {
"early_stopping_rounds": 30,
"eval_metric": 'auc',
"eval_set": [(None, None)],
'eval_names': ['valid'],
'callbacks': [lgbm.reset_parameter(learning_rate=lr_decayp())],
'verbose': 100,
'categorical_feature': 'auto'
}
for key, value in kwargs.items():
fit_params[key] = value
return fit_params
def test_cv(self):
X, y = load_boston(True)
X_train, _, y_train, _ = train_test_split(X,
y,
test_size=0.1,
random_state=42)
params = {'verbose': -1}
lgb_train = lgb.Dataset(X_train, y_train)
# shuffle = False, override metric in params
params_with_metric = {'metric': 'l2', 'verbose': -1}
lgb.cv(params_with_metric,
lgb_train,
num_boost_round=10,
nfold=3,
shuffle=False,
metrics='l1',
verbose_eval=False)
# shuffle = True, callbacks
lgb.cv(params,
lgb_train,
num_boost_round=10,
nfold=3,
shuffle=True,
metrics='l1',
verbose_eval=False,
callbacks=[
lgb.reset_parameter(learning_rate=lambda i: 0.1 - 0.001 * i)
])
# self defined data_splitter
tss = TimeSeriesSplit(3)
lgb.cv(
params,
lgb_train,
num_boost_round=10,
data_splitter=tss,
nfold=5, # test if wrong nfold is ignored
metrics='l2',
verbose_eval=False)
# lambdarank
X_train, y_train = load_svmlight_file(
'../../examples/lambdarank/rank.train')
q_train = np.loadtxt('../../examples/lambdarank/rank.train.query')
params_lambdarank = {'objective': 'lambdarank', 'verbose': -1}
lgb_train = lgb.Dataset(X_train, y_train, group=q_train)
lgb.cv(params_lambdarank,
lgb_train,
num_boost_round=10,
nfold=3,
metrics='l2',
verbose_eval=False)
def test_xendcg(self):
dir_path = os.path.dirname(os.path.realpath(__file__))
X_train, y_train = load_svmlight_file(os.path.join(dir_path, '../../examples/xendcg/rank.train'))
X_test, y_test = load_svmlight_file(os.path.join(dir_path, '../../examples/xendcg/rank.test'))
q_train = np.loadtxt(os.path.join(dir_path, '../../examples/xendcg/rank.train.query'))
q_test = np.loadtxt(os.path.join(dir_path, '../../examples/xendcg/rank.test.query'))
gbm = lgb.LGBMRanker(n_estimators=50, objective='rank_xendcg', random_state=5, n_jobs=1)
gbm.fit(X_train, y_train, group=q_train, eval_set=[(X_test, y_test)],
eval_group=[q_test], eval_at=[1, 3], early_stopping_rounds=10, verbose=False,
eval_metric='ndcg',
callbacks=[lgb.reset_parameter(learning_rate=lambda x: max(0.01, 0.1 - 0.01 * x))])
self.assertLessEqual(gbm.best_iteration_, 24)
self.assertGreater(gbm.best_score_['valid_0']['ndcg@1'], 0.6579)
self.assertGreater(gbm.best_score_['valid_0']['ndcg@3'], 0.6421)
def test_cv(self):
X, y = load_boston(True)
X_train, _, y_train, _ = train_test_split(X, y, test_size=0.1, random_state=42)
params = {'verbose': -1}
lgb_train = lgb.Dataset(X_train, y_train)
# shuffle = False, override metric in params
params_with_metric = {'metric': 'l2', 'verbose': -1}
cv_res = lgb.cv(params_with_metric, lgb_train, num_boost_round=10,
nfold=3, stratified=False, shuffle=False,
metrics='l1', verbose_eval=False)
self.assertIn('l1-mean', cv_res)
self.assertNotIn('l2-mean', cv_res)
self.assertEqual(len(cv_res['l1-mean']), 10)
# shuffle = True, callbacks
cv_res = lgb.cv(params, lgb_train, num_boost_round=10, nfold=3, stratified=False, shuffle=True,
metrics='l1', verbose_eval=False,
callbacks=[lgb.reset_parameter(learning_rate=lambda i: 0.1 - 0.001 * i)])
self.assertIn('l1-mean', cv_res)
self.assertEqual(len(cv_res['l1-mean']), 10)
# self defined folds
tss = TimeSeriesSplit(3)
folds = tss.split(X_train)
cv_res_gen = lgb.cv(params_with_metric, lgb_train, num_boost_round=10, folds=folds,
verbose_eval=False)
cv_res_obj = lgb.cv(params_with_metric, lgb_train, num_boost_round=10, folds=tss,
verbose_eval=False)
np.testing.assert_almost_equal(cv_res_gen['l2-mean'], cv_res_obj['l2-mean'])
# lambdarank
X_train, y_train = load_svmlight_file(os.path.join(os.path.dirname(os.path.realpath(__file__)),
'../../examples/lambdarank/rank.train'))
q_train = np.loadtxt(os.path.join(os.path.dirname(os.path.realpath(__file__)),
'../../examples/lambdarank/rank.train.query'))
params_lambdarank = {'objective': 'lambdarank', 'verbose': -1, 'eval_at': 3}
lgb_train = lgb.Dataset(X_train, y_train, group=q_train)
# ... with l2 metric
cv_res_lambda = lgb.cv(params_lambdarank, lgb_train, num_boost_round=10, nfold=3,
metrics='l2', verbose_eval=False)
self.assertEqual(len(cv_res_lambda), 2)
self.assertFalse(np.isnan(cv_res_lambda['l2-mean']).any())
# ... with NDCG (default) metric
cv_res_lambda = lgb.cv(params_lambdarank, lgb_train, num_boost_round=10, nfold=3,
verbose_eval=False)
self.assertEqual(len(cv_res_lambda), 2)
self.assertFalse(np.isnan(cv_res_lambda['ndcg@3-mean']).any())
# self defined folds with lambdarank
cv_res_lambda_obj = lgb.cv(params_lambdarank, lgb_train, num_boost_round=10,
folds=GroupKFold(n_splits=3),
verbose_eval=False)
np.testing.assert_almost_equal(cv_res_lambda['ndcg@3-mean'], cv_res_lambda_obj['ndcg@3-mean'])
def fit(self, X, Y, eval_set=[]):
self.classes_ = unique_labels(Y)
self.X_ = X
self.y_ = Y
self.gbdt.fit(X, Y,
eval_set=eval_set,
eval_metric=lambda y_true, y_pred: [
self._focal_eval(y_true, y_pred),
self._f1_score(y_true, y_pred)
],
verbose=100,
callbacks=[lgb.reset_parameter(learning_rate=self._lr_linear_cosine_decay)]
)
return self
def get_model(train_x, train_y, valid_x, valid_y, num_class,
best_params) -> t.Any:
best_params = {
'lambda_l1': 5.96,
'lambda_l2': 1.1,
'num_leaves': 12,
'feature_fraction': 0.75,
'bagging_fraction': 0.89,
'bagging_freq': 7,
#'min_child_sample': 100
}
# 学習用データセット
train_set = lgb.Dataset(train_x, train_y, free_raw_data=False)
# 評価用データセット
valid_set = lgb.Dataset(valid_x, valid_y, free_raw_data=False)
evals_result = {}
params = {
'objective': 'multiclass',
'metric': 'multi_logloss',
'boosting_type': 'gbdt',
'num_class': num_class,
**best_params
}
model = lgb.train(
params=params,
train_set=train_set,
valid_sets=[valid_set, train_set],
num_boost_round=1000,
early_stopping_rounds=100,
verbose_eval=10,
# learning_rates=lambda iter: 0.1 * (0.99 ** iter),
callbacks=[
lgb.reset_parameter(learning_rate=[0.2] * 400 + [0.1] * 400 +
[0.05] * 200)
],
evals_result=evals_result,
)
importance = pd.DataFrame(model.feature_importance(),
index=train_x.columns,
columns=['importance'
]).sort_values('importance',
ascending=[False])
print(importance.head(50))
return model, evals_result
def cross_validate(param=dict(n_estimators=1000,
metric="map",
colsample_bytree=0.2,
max_depth=7,
importance_type="gain"),
n_folds=5,
target="satisfied"):
train_users = big_table["user_id"].unique()
folds = KFold(n_folds, shuffle=True, random_state=42)
models = []
test_pred = np.zeros(test_big_table.shape[0])
scores = []
for idx, (train_idx, valid_idx) in enumerate(folds.split(train_users)):
t_user = train_users[train_idx]
v_user = train_users[valid_idx]
train_data = big_table[big_table["user_id"].isin(t_user)]
valid_data = big_table[big_table["user_id"].isin(v_user)]
train_group = train_data.groupby(
"user_id", as_index=False).count()["satisfied"].values
valid_group = valid_data.groupby(
"user_id", as_index=False).count()["satisfied"].values
test_group = test_big_table.groupby(
"user_id", as_index=False).count()["jd_no"].values
result = feature_select(target, train_data, valid_data, test_big_table)
t_x, t_y = result[0]
v_x, v_y = result[1]
test_x, _ = result[2]
model = lgb.LGBMRanker(**param)
print("Fold", idx, "-" * 30)
model.fit(
t_x,
t_y,
group=train_group,
eval_set=[(t_x, t_y), (v_x, v_y)],
eval_group=[train_group, valid_group],
early_stopping_rounds=100,
verbose=10,
callbacks=[lgb.reset_parameter(learning_rate=lambda x: 0.01)])
models.append(model)
test_pred += model.predict(test_x) / n_folds
scores.append(model.best_score_["valid_1"]["ndcg@1"])
print("mean score", np.mean(scores))
return models, test_pred
def test_cv(self):
lgb_train, _ = template.test_template(return_data=True)
# shuffle = False
lgb.cv({'verbose': -1},
lgb_train,
num_boost_round=10,
nfold=3,
shuffle=False,
metrics='l1',
verbose_eval=False)
# shuffle = True, callbacks
lgb.cv({'verbose': -1},
lgb_train,
num_boost_round=10,
nfold=3,
shuffle=True,
metrics='l1',
verbose_eval=False,
callbacks=[
lgb.reset_parameter(learning_rate=lambda i: 0.1 - 0.001 * i)
])
# self defined data_splitter
tss = TimeSeriesSplit(3)
lgb.cv(
{'verbose': -1},
lgb_train,
num_boost_round=10,
data_splitter=tss,
nfold=5, # test if wrong nfold is ignored
metrics='l2',
verbose_eval=False)
# lambdarank
X_train, y_train = load_svmlight_file(
'../../examples/lambdarank/rank.train')
q_train = np.loadtxt('../../examples/lambdarank/rank.train.query')
params = {'objective': 'lambdarank', 'verbose': -1}
lgb_train = lgb.Dataset(X_train, y_train, group=q_train, params=params)
lgb.cv(params,
lgb_train,
num_boost_round=20,
nfold=3,
metrics='l2',
verbose_eval=False)
def train_lgb_rank_model(ranker, train_data, test_data):
"""
"""
X_train, y_train, q_train = train_data
X_test, y_test, q_test = test_data
ranker.fit(
X_train,
y_train,
group=q_train,
eval_set=[(X_test, y_test)],
eval_group=[q_test],
eval_at=[1, 3],
early_stopping_rounds=5,
verbose=True,
callbacks=[lgb.reset_parameter(learning_rate=lambda x: 0.9**x * 0.1)],
)
return ranker
def train(self):
global MODEL_PATH
lgb_train, lgb_test = self.samples()
def learning_rate(epoch, span=100):
cycle = [0.5, 0.4, 0.3, 0.2, 0.1, 0.05, 0.005]
lr = cycle[(epoch // span) % len(cycle)]
print(f"LEARN RATE = {lr}")
return lr
gbm = lgb.train(
self.params,
lgb_train,
num_boost_round=4000, # +oo
valid_sets=lgb_test,
# init_model=MODEL_PATH,
early_stopping_rounds=500, # 5000
callbacks=[lgb.reset_parameter(learning_rate=learning_rate)],
)
gbm.save_model(MODEL_PATH)
self.load()
def test_joblib(self):
X, y = load_boston(True)
X_train, X_test, y_train, y_test = train_test_split(X,
y,
test_size=0.1,
random_state=42)
gbm = lgb.LGBMRegressor(n_estimators=10,
objective=custom_asymmetric_obj,
silent=True,
importance_type='split')
gbm.fit(
X_train,
y_train,
eval_set=[(X_train, y_train), (X_test, y_test)],
eval_metric=mse,
early_stopping_rounds=5,
verbose=False,
callbacks=[
lgb.reset_parameter(learning_rate=list(np.arange(1, 0, -0.1)))
])
joblib.dump(gbm, 'lgb.pkl') # test model with custom functions
gbm_pickle = joblib.load('lgb.pkl')
self.assertIsInstance(gbm_pickle.booster_, lgb.Booster)
self.assertDictEqual(gbm.get_params(), gbm_pickle.get_params())
np.testing.assert_array_equal(gbm.feature_importances_,
gbm_pickle.feature_importances_)
self.assertAlmostEqual(gbm_pickle.learning_rate, 0.1)
self.assertTrue(callable(gbm_pickle.objective))
for eval_set in gbm.evals_result_:
for metric in gbm.evals_result_[eval_set]:
np.testing.assert_allclose(
gbm.evals_result_[eval_set][metric],
gbm_pickle.evals_result_[eval_set][metric])
pred_origin = gbm.predict(X_test)
pred_pickle = gbm_pickle.predict(X_test)
np.testing.assert_allclose(pred_origin, pred_pickle)
def test_cv(self):
X, y = load_boston(True)
X_train, _, y_train, _ = train_test_split(X, y, test_size=0.1, random_state=42)
params = {'verbose': -1}
lgb_train = lgb.Dataset(X_train, y_train)
# shuffle = False, override metric in params
params_with_metric = {'metric': 'l2', 'verbose': -1}
lgb.cv(params_with_metric, lgb_train, num_boost_round=10, nfold=3, stratified=False, shuffle=False,
metrics='l1', verbose_eval=False)
# shuffle = True, callbacks
lgb.cv(params, lgb_train, num_boost_round=10, nfold=3, stratified=False, shuffle=True,
metrics='l1', verbose_eval=False,
callbacks=[lgb.reset_parameter(learning_rate=lambda i: 0.1 - 0.001 * i)])
# self defined folds
tss = TimeSeriesSplit(3)
folds = tss.split(X_train)
lgb.cv(params_with_metric, lgb_train, num_boost_round=10, folds=folds, stratified=False, verbose_eval=False)
# lambdarank
X_train, y_train = load_svmlight_file(os.path.join(os.path.dirname(os.path.realpath(__file__)), '../../examples/lambdarank/rank.train'))
q_train = np.loadtxt(os.path.join(os.path.dirname(os.path.realpath(__file__)), '../../examples/lambdarank/rank.train.query'))
params_lambdarank = {'objective': 'lambdarank', 'verbose': -1}
lgb_train = lgb.Dataset(X_train, y_train, group=q_train)
lgb.cv(params_lambdarank, lgb_train, num_boost_round=10, nfold=3, stratified=False, metrics='l2', verbose_eval=False)
for train_index, val_index in kf.split(dataset_values, dataset_target):
i += 1
val_target = dataset_target.iloc[val_index]
val_val = dataset_values.iloc[val_index]
train_target = dataset_target.iloc[train_index]
train_val = dataset_values.iloc[train_index]
# add extra columns missings in the test set
for col in train_val.columns:
if col not in val_val.columns:
val_val[col] = 0
val_val = val_val[train_val.columns]
clf = lgb.LGBMClassifier()
clf.set_params(**params)
clf.fit(train_val.values, train_target,
callbacks=[lgb.reset_parameter(learning_rate=lr_decay)])
y_pred = clf.predict(val_val)
correct = len([i for i, j in zip(y_pred, val_target) if i == j])
ratio = correct/len(val_target)*100
print(f"Accuracy f-{i}: {ratio:.3f}")
preds += array(clf.predict_proba(test_val))
preds = argmax(preds, axis=1)
submission = pd.read_csv(PATH_DATA + 'SubmissionFormat.csv')
labels = ["non functional", "functional needs repair", "functional"]
submission['status_group'] = list(map(lambda x: labels[x], preds))
submission.to_csv(PATH_DATA + "submission.csv", index=False)
from optuna import structs
from optuna import study as study_module
from sklearn.datasets import load_breast_cancer
from sklearn.model_selection import GroupKFold
from sklearn.model_selection import train_test_split
from sklearn.preprocessing import LabelEncoder
from optgbm.sklearn import OGBMClassifier
from optgbm.sklearn import OGBMRegressor
from optgbm.sklearn import _VotingBooster
n_estimators = 10
n_trials = 5
random_state = 0
callback = lgb.reset_parameter(
learning_rate=lambda iteration: 0.05 * (0.99**iteration))
early_stopping_rounds = 3
def log_likelihood(y_true: np.ndarray,
y_pred: np.ndarray) -> Tuple[np.ndarray, np.ndarray]:
y_pred = 1.0 / (1.0 + np.exp(-y_pred))
return y_pred - y_true, y_pred * (1.0 - y_pred)
def zero_one_loss(y_true: np.ndarray,
y_pred: np.ndarray) -> Tuple[str, np.number, bool]:
return "zero_one_loss", np.mean(y_true != y_pred), False
gbm = lgb.train(params,
lgb_train,
num_boost_round=10,
init_model=gbm,
learning_rates=lambda iter: 0.05 * (0.99 ** iter),
valid_sets=lgb_eval)
print('Finish 20 - 30 rounds with decay learning rates...')
# change other parameters during training
gbm = lgb.train(params,
lgb_train,
num_boost_round=10,
init_model=gbm,
valid_sets=lgb_eval,
callbacks=[lgb.reset_parameter(bagging_fraction=[0.7] * 5 + [0.6] * 5)])
print('Finish 30 - 40 rounds with changing bagging_fraction...')
# self-defined objective function
# f(preds: array, train_data: Dataset) -> grad: array, hess: array
# log likelihood loss
def loglikelood(preds, train_data):
labels = train_data.get_label()
preds = 1. / (1. + np.exp(-preds))
grad = preds - labels
hess = preds * (1. - preds)
return grad, hess
def test_param(lgbm_param):
print('in test_param')
gc.collect()
global y_train_new, X_train_new, y_val_new, X_val_new
# val_num = int(0.2*len(train_X))
# X_train_new = train_X.iloc[val_num:,:]
# y_train_new = train_y[val_num:]
# X_val_new = train_X.iloc[:val_num,:]
# y_val_new = train_y.iloc[:val_num]
# print('start train_test_split')
# X_train_new, X_val_new, y_train_new, y_val_new = train_test_split(train_X,
# train_y, test_size=0.25, random_state=SEED)
start_t = time.time()
lgbm = lgb.LGBMClassifier(**lgbm_param)
learning_rate_func = lgb.reset_parameter(
learning_rate=generate_learning_rate_list())
print('start partial trainning')
lgbm.fit(
X_train_new,
y_train_new,
eval_set=[(X_train_new, y_train_new), (X_val_new, y_val_new)],
callbacks=[learning_rate_func],
# eval_metric=log_loss_def,
eval_metric='logloss',
# eval_metric='auc',
verbose=100,
early_stopping_rounds=300)
print('partial fit cost time: ', time.time() - start_t)
best_iteration = lgbm.best_iteration_
# print('best score value is ', lgbm.best_score_)
# logloss_val = round(lgbm.best_score_['valid_1']['auc'], 5)
logloss_val = round(lgbm.best_score_['valid_1']['binary_logloss'], 5)
val_click_prob = lgbm.predict_proba(X_val_new)[:, 1]
# val_click_prob_new = managed_change(val_click_prob)
print('after managed_change logloss is ',
log_loss(y_val_new, val_click_prob),
log_loss(y_val_new, managed_change(val_click_prob, ratio=0.01)),
log_loss(y_val_new, managed_change(val_click_prob, ratio=0.02)),
log_loss(y_val_new, managed_change(val_click_prob, ratio=0.05)),
log_loss(y_val_new, managed_change(val_click_prob, ratio=0.08)),
log_loss(y_val_new, managed_change(val_click_prob, ratio=0.10)))
print('after managed_change auc is ',
roc_auc_score(y_val_new, val_click_prob),
roc_auc_score(y_val_new, managed_change(val_click_prob, ratio=0.01)),
roc_auc_score(y_val_new, managed_change(val_click_prob, ratio=0.02)),
roc_auc_score(y_val_new, managed_change(val_click_prob, ratio=0.05)),
roc_auc_score(y_val_new, managed_change(val_click_prob, ratio=0.08)),
roc_auc_score(y_val_new, managed_change(val_click_prob, ratio=0.10)))
start_t = time.time()
prediction_click_prob = lgbm.predict_proba(test_X)[:, 1]
outcome_df['predicted_score'] = prediction_click_prob
param_md5_str = convert_2_md5(lgbm_param)
store_path = 'C:/D_Disk/data_competition/xunfei_ai_ctr/outcome/'
partial_file_name = '_'.join(
['submission_partial',
str(logloss_val), param_md5_str]) + '.csv'
full_file_name = '_'.join(
['submission_full', str(logloss_val), param_md5_str]) + '.csv'
outcome_df['predicted_score'].to_csv(store_path + partial_file_name,
header=['predicted_score'])
print('partial get predict outcome cost time: ', time.time() - start_t)
del lgbm
gc.collect()
del X_train_new, X_val_new
gc.collect()
del y_train_new, y_val_new
gc.collect()
for i in range(5):
gc.collect()
# start_t = time.time()
# lgbm_param['n_estimators'] = int(best_iteration*1.0)
# print('normal full fit n_estimators is ', int(best_iteration*1.0))
# lgbm = lgb.LGBMClassifier(**lgbm_param)
# lgbm.fit(train_X, train_y)
# print('normal full fit cost time: ', time.time()-start_t)
#
# start_t = time.time()
# prediction_click_prob = lgbm.predict_proba(test_X)[:,1]
# outcome_df['predicted_score'] = prediction_click_prob
# outcome_df['predicted_score'].to_csv(store_path+full_file_name,
# header=['predicted_score'])
# print('normal full predict cost time: ', time.time()-start_t)
start_t = time.time()
lgbm_param['n_estimators'] = int(best_iteration * 1.1)
print('extra full fit n_estimators is ', int(best_iteration * 1.1))
lgbm = lgb.LGBMClassifier(**lgbm_param)
learning_rate_func = lgb.reset_parameter(
learning_rate=generate_learning_rate_list()
[:lgbm_param['n_estimators']])
lgbm.fit(train_X, train_y, callbacks=[learning_rate_func])
print('extra full fit cost time: ', time.time() - start_t)
start_t = time.time()
prediction_click_prob = lgbm.predict_proba(test_X)[:, 1]
outcome_df['predicted_score'] = prediction_click_prob
outcome_df['predicted_score'].to_csv(store_path + full_file_name,
header=['predicted_score'])
print('extra full predict cost time: ', time.time() - start_t)
write_to_log('-' * 25, ' md5 value: ', param_md5_str, '-' * 25)
write_to_log('param: ', lgbm_param)
write_to_log('best_iteration: ', best_iteration)
write_to_log('valid rmse: ', logloss_val)
write_to_log('-' * 80 + '\n')
tune_params = {
'n_estimators': [200, 500, 1000, 2500, 5000],
'max_depth': sp_randint(4, 12),
'colsample_bytree': sp_uniform(loc=0.8, scale=0.15),
'min_child_samples': sp_randint(60, 120),
'subsample': sp_uniform(loc=0.75, scale=0.25),
'reg_lambda': [1e-3, 1e-2, 1e-1, 1]
}
fit_params = {
'early_stopping_rounds': 40,
'eval_metric': 'accuracy',
'eval_set': [(X_train, y_train), (X_val, y_val)],
'verbose': 20,
'callbacks': [lgb.reset_parameter(learning_rate=learning_rate_power)]
}
lgb_clf = lgb.LGBMClassifier(n_jobs=4, objective='binary', random_state=1)
gs = RandomizedSearchCV(estimator=lgb_clf,
param_distributions=tune_params,
n_iter=40,
scoring='f1',
cv=5,
refit=True,
random_state=1,
verbose=True)
lgb_clf = lgb.LGBMClassifier(n_jobs=4,
objective='multiclass',
random_state=100)
opt_params = {
reg_alpha=0.0,
reg_lambda=100.0,
scale_pos_weight=1.0,
subsample=1.0,
subsample_freq=1,
random_state=n_fold)
clf.fit(
trn_x,
trn_y,
eval_set=[(trn_x, trn_y), (val_x, val_y)],
eval_metric='auc',
verbose=1000,
early_stopping_rounds=600,
callbacks=[
lgb.reset_parameter(
learning_rate=[200 / (8000 + x) for x in range(10000)])
],
# categorical_feature=CATEGORICAL_COLUMNS #30
categorical_feature=small_cat #30
)
oof_preds[val_idx] = clf.predict_proba(
val_x, num_iteration=clf.best_iteration_)[:, 1]
sub_preds += rankdata(
clf.predict_proba(test[feats], num_iteration=clf.best_iteration_)
[:, 1]) / folds.n_splits / len(sub_preds)
fold_importance_df = pd.DataFrame()
fold_importance_df["feature"] = feats
fold_importance_df["importance"] = clf.feature_importances_
fold_importance_df["fold"] = n_fold + 1
base_learning_rate = 0.1
lr = base_learning_rate * np.power(.995, current_iter)
return lr if lr > 1e-3 else 1e-3
def learning_rate_005_decay_power_099(current_iter):
base_learning_rate = 0.05
lr = base_learning_rate * np.power(.99, current_iter)
return lr if lr > 1e-3 else 1e-3
#setup lgb parameters
fit_params={"early_stopping_rounds":30,
"eval_metric" : 'mae',
"eval_set" : [(X_test,y_test)],
'eval_names': ['valid'],
'callbacks': [lgb.reset_parameter(learning_rate=learning_rate_010_decay_power_099)],
'verbose': -1,
'categorical_feature': 'auto',
}
#starting parameters
param_test ={
# =============================================================================
# 'num_leaves': sp_randint(100, 1000),
# 'max_depth': sp_randint(1, 10),
# 'min_data_in_leaf': sp_randint(1, 100),
# =============================================================================
# =============================================================================
# 'min_child_samples': sp_randint(100, 1000),
# 'min_child_weight': sp_uniform(loc=0, scale=1.0),#[1e-5, 1e-3, 1e-2, 1e-1, 1, 1e1, 1e2, 1e3, 1e4],
# 'subsample': sp_uniform(loc=0.2, scale=0.8),
print(f'{i}:{attr} FOLD:{fold}')
X_train, X_valid = X[train_index], X[valid_index]
y_train, y_valid = y[train_index], y[valid_index]
ys.append(y_valid)
#print(X_train.shape, y_train.shape)
fit_params={"early_stopping_rounds":300,
"eval_metric" : evaluate_macroF1_lgb,
"eval_set" : [(X_valid,y_valid)],
'eval_names': ['valid'],
#'callbacks': [lgb.reset_parameter(learning_rate=learning_rate_010_decay_power_099)],
'verbose': False,
'categorical_feature': 'auto'}
fit_params['callbacks'] = [lgb.reset_parameter(learning_rate=learning_rate_power_0997)]
opt_parameters = {
#'colsample_bytree': 0.9221304051471293,
'min_child_samples': 150,
'num_leaves': 2,
#'subsample': 0.9510118790770111,
'class_weight': 'balanced',
'lambda_l1': 1.79,
'lambda_l2': 1.71,
'num_trees': 2000
}
#clf_final = lgb.LGBMClassifier(**clf.get_params())
#clf_final.set_params(**opt_parameters)
clf_final = lgb.LGBMClassifier(bagging_fraction=0.9957236684465528, boosting_type='gbdt',
class_weight='balanced', colsample_bytree=0.7953949538181928,
gbm = lgb.train(params,
lgb_train,
num_boost_round=10,
init_model=gbm,
learning_rates=lambda iter: 0.05 * (0.99 ** iter),
valid_sets=lgb_eval)
print('Finished 20 - 30 rounds with decay learning rates...')
# change other parameters during training
gbm = lgb.train(params,
lgb_train,
num_boost_round=10,
init_model=gbm,
valid_sets=lgb_eval,
callbacks=[lgb.reset_parameter(bagging_fraction=[0.7] * 5 + [0.6] * 5)])
print('Finished 30 - 40 rounds with changing bagging_fraction...')
# self-defined objective function
# f(preds: array, train_data: Dataset) -> grad: array, hess: array
# log likelihood loss
def loglikelihood(preds, train_data):
labels = train_data.get_label()
preds = 1. / (1. + np.exp(-preds))
grad = preds - labels
hess = preds * (1. - preds)
return grad, hess
"random_state": 1337
}
dtrain = lgb.Dataset(X_train, label=y_train)
dvalid = lgb.Dataset(X_test, label=y_test)
evals_result = {}
clf_lgb = lgb.train(
params,
dtrain,
valid_sets=[dtrain, dvalid],
num_boost_round=500,
early_stopping_rounds=50,
verbose_eval=100,
feature_name=df.iloc[:, 4:].columns.tolist(),
callbacks=[
lgb.reset_parameter(learning_rate=learning_rate_010_decay_power_099)
],
evals_result=evals_result)
y_pred1 = clf_lgb.predict(X_train, num_iteration=clf_lgb.best_iteration)
y_pred1 = np.argmax(y_pred1, axis=1)
y_pred2 = clf_lgb.predict(X_test, num_iteration=clf_lgb.best_iteration)
y_pred2 = np.argmax(y_pred2, axis=1)
score1 = accuracy_score(y_train, y_pred1) * 100
score2 = accuracy_score(y_test, y_pred2) * 100
print("\nLGB Model Report")
print("train {:.2f} | valid {:.2f}".format(float(score1), float(score2)))
# hyperparameters tuning
clf_lgb = lgb.LGBMClassifier(learning_rate=0.1,
n_estimators=100,
def test_cv(self):
lgb_train, _ = template.test_template(return_data=True)
lgb.cv({'verbose': -1}, lgb_train, num_boost_round=20, nfold=5,
metrics='l1', verbose_eval=False,
callbacks=[lgb.reset_parameter(learning_rate=lambda i: 0.1 - 0.001 * i)])