def get_importances_from_model(X,
y,
features=None,
verbose=50,
early_stopping_rounds=200):
lgb_params = {}
lgb_params['boosting_type'] = 'gbdt'
lgb_params['objective'] = 'binary'
lgb_params['learning_rate'] = 0.03
lgb_params['metric'] = 'auc'
lgb_params['num_iterations'] = 10000
lgb_params["colsample_bytree"] = 0.5
lgb_params["subsample"] = 0.8
lgb_params["reg_alpha"] = 0.3
lgb_params['reg_lambda'] = 0.3
lgb_params['max_depth'] = 8
if features == None:
features = X.columns.tolist()
train_X, val_X, train_y, val_y = train_test_split(X, y, random_state=2017)
lgb_train = Dataset(data=train_X, label=train_y, feature_name=features)
lgb_val = Dataset(data=val_X, label=val_y, feature_name=features)
lgb_booster = train(params=lgb_params,
train_set=lgb_train,
valid_sets=[lgb_train, lgb_val],
valid_names=["train", "validation"],
verbose_eval=verbose,
early_stopping_rounds=early_stopping_rounds)
return lgb_booster
def _evaluate(self, scores: np.ndarray, clases: lgb.Dataset) -> Tuple[str, int, bool]:
labels = clases.get_label()
weights = clases.get_weight()
score_corte = self.prob_corte
nombre, valor = self._evaluar_funcion_ganancia(scores, labels, weights, score_corte)
return nombre, valor, True
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 Dist_Objective(predt: np.ndarray, data: lgb.Dataset):
"""A customized objective function to train each distributional parameter using custom gradient and hessian.
"""
target = torch.tensor(data.get_label())
# When num_class!= 0, preds has shape (n_obs, n_dist_param).
# Each element in a row represents a raw prediction (leaf weight, hasn't gone through response function yet).
predt = predt.reshape(-1, Gaussian.n_dist_param(), order="F")
preds_location = Gaussian.param_dict()["location"](predt[:, 0])
preds_location = torch.tensor(preds_location, requires_grad=True)
preds_scale = Gaussian.param_dict()["scale"](predt[:, 1])
preds_scale = torch.tensor(preds_scale, requires_grad=True)
# Weights
if data.get_weight() == None:
# Use 1 as weight if no weights are specified
weights = np.ones_like(target, dtype=float)
else:
weights = data.get_weight()
# Initialize Gradient and Hessian Matrices
grad = np.zeros(shape=(len(target), Gaussian.n_dist_param()))
hess = np.zeros(shape=(len(target), Gaussian.n_dist_param()))
# Specify Metric for Auto Derivation
dGaussian = Normal(preds_location, preds_scale)
autograd_metric = -dGaussian.log_prob(target).nansum()
# Location
grad[:, 0] = stabilize_derivative(
auto_grad(metric=autograd_metric, parameter=preds_location, n=1) *
weights, Gaussian.stabilize)
hess[:, 0] = stabilize_derivative(
auto_grad(metric=autograd_metric, parameter=preds_location, n=2) *
weights, Gaussian.stabilize)
# Scale
grad[:, 1] = stabilize_derivative(
auto_grad(metric=autograd_metric, parameter=preds_scale, n=1) *
weights, Gaussian.stabilize)
hess[:, 1] = stabilize_derivative(
auto_grad(metric=autograd_metric, parameter=preds_scale, n=2) *
weights, Gaussian.stabilize)
# Reshaping
grad = grad.ravel(order="F")
hess = hess.ravel(order="F")
return grad, hess
def _make_validation_labels_purchase_only(valid_ds: lgb.Dataset):
valid_ds.construct()
labels = np.array(valid_ds.get_label())
non_purchase = (labels != _PURCHASE_LABEL)
non_purchase_interaction = np.logical_and(non_purchase,
labels != _NOTHING_LABEL)
logging.info(
f"Number of non-purchase interactions in valid: {non_purchase_interaction.sum()}"
)
logging.info(
f"Number of total non-purchases in valid: {non_purchase.sum()}")
labels[non_purchase] = 0.0
valid_ds.set_label(labels)
def Dist_Objective(predt: np.ndarray, data: lgb.Dataset):
"""A customized objective function to train each distributional parameter using custom gradient and hessian.
"""
target = data.get_label()
# When num_class!= 0, preds has shape (n_obs, n_dist_param).
# Each element in a row represents a raw prediction (leaf weight, hasn't gone through response function yet).
predt = predt.reshape(-1, Gaussian.n_dist_param(), order="F")
preds_location = Gaussian.param_dict()["location"](predt[:, 0])
preds_scale = Gaussian.param_dict()["scale"](predt[:, 1])
# Weights
if data.get_weight() == None:
# Use 1 as weight if no weights are specified
weights = np.ones_like(target, dtype=float)
else:
weights = data.get_weight()
# Initialize Gradient and Hessian Matrices
grad = np.zeros(shape=(len(target), Gaussian.n_dist_param()))
hess = np.zeros(shape=(len(target), Gaussian.n_dist_param()))
# Location
grad[:, 0] = Gaussian.gradient_location(y=target,
location=preds_location,
scale=preds_scale,
weights=weights)
hess[:, 0] = Gaussian.hessian_location(scale=preds_scale,
weights=weights)
# Scale
grad[:, 1] = Gaussian.gradient_scale(y=target,
location=preds_location,
scale=preds_scale,
weights=weights)
hess[:, 1] = Gaussian.hessian_scale(scale=preds_scale,
weights=weights)
# Reshaping
grad = grad.ravel(order="F")
hess = hess.ravel(order="F")
return grad, hess
def lightgbm_trainer(training_data, label, model_params):
"""Train LightGBM model on training data.
Args:
training_data (lightgbm.Dataset): Training data.
label (str): Target column in training data.
model_params (dict): Training parameters.
Returns:
lightgbm.Booster: Trained LightGBM model.
"""
training_data = Dataset(data=training_data.drop(label, axis=1),
label=training_data[LABEL])
return train(train_set=training_data, params=model_params)
def lgb_compatible_f1_score(y_hat: np.ndarray,
data: lgb.Dataset) -> Tuple[str, float, bool]:
y_true = data.get_label().astype(int)
y_hat = np.round(y_hat).astype(
int) # scikit's f1 doesn't work with probabilities
return "f1_score", f1_score(y_true, y_hat), True
def get_importances_from_model(X, y, features=None):
lgb_params = {}
lgb_params['boosting_type'] = 'gbdt'
lgb_params['objective'] = 'binary'
lgb_params['learning_rate'] = 0.02
lgb_params['metric'] = 'auc'
# lgb_params['num_leaves'] = 34
lgb_params['colsample_bytree'] = 0.75
lgb_params['subsample'] = 0.75
lgb_params['n_estimators'] = 1500
# lgb_params['max_depth'] = 8
# lgb_params["reg_alpha"] = 0.041545473
# lgb_params['reg_lambda'] = 0.0735294
# lgb_params['min_split_gain'] = 0.0735294
# lgb_params['min_child_weight'] = 0.0735294
# lgb_params['silent'] = False
if features == None:
features = X.columns.tolist()
lgb_train = Dataset(data=X, label=y, feature_name=features)
lgb_booster = train(params=lgb_params,
train_set=lgb_train,
verbose_eval=50,
num_boost_round=1500)
return lgb_booster
def lgb_custom_eval(y_pred: np.ndarray,
data: lgb.Dataset,
func_loss,
func_name: str,
is_higher_better: bool,
is_lgbdataset: bool = True):
"""
lightGBMのcustomized objectiveの共通関数
Params::
y_pred:
予測値. multi classの場合は、n_sample * n_class の長さになったいる
値は、array([0データ目0ラベルの予測値, ..., Nデータ目0ラベルの予測値, 0データ目1ラベルの予測値, ..., ])
data:
train_set に set した値
func_loss:
y_pred, y_true を入力に持つ
"""
if is_lgbdataset == False:
y_true = y_pred.copy()
y_pred = data
else:
y_true = data.label
if is_callable(data, "ndf_label"):
y_true = data.get_culstom_label(y_true.astype(int))
if y_pred.shape[0] != y_true.shape[0]:
# multi class の場合
y_pred = y_pred.reshape(-1, y_true.shape[0]).T
value = func_loss(y_pred, y_true)
return func_name, value, is_higher_better
def lgb_custom_objective(y_pred: np.ndarray,
data: lgb.Dataset,
func_loss,
is_lgbdataset: bool = True):
"""
lightGBMのcustomized objectiveの共通関数
Params::
y_pred:
予測値. multi classの場合は、n_sample * n_class の長さになったいる
値は、array([0データ目0ラベルの予測値, ..., Nデータ目0ラベルの予測値, 0データ目1ラベルの予測値, ..., ])
data:
train_set に set した値
func_loss:
y_pred, y_true を入力に持ち、y_pred と同じ shape を持つ return をする
is_lgbdataset:
lgb.dataset でなかった場合は入力が逆転するので気をつける
"""
if is_lgbdataset == False:
y_true = y_pred.copy()
y_pred = data
else:
y_true = data.label
if is_callable(data, "ndf_label"):
y_true = data.get_culstom_label(y_true.astype(int))
if y_pred.shape[0] != y_true.shape[0]:
# multi class の場合
y_pred = y_pred.reshape(-1, y_true.shape[0]).T
grad, hess = func_loss(y_pred, y_true)
return grad.T.reshape(-1), hess.T.reshape(-1)
def test_onnxrt_python_lightgbm_categorical_iris(self):
iris = load_iris()
X, y = iris.data, iris.target
X = (X * 10).astype(numpy.int32)
X_train, X_test, y_train, _ = train_test_split(X, y, random_state=11)
other_x = numpy.random.randint(0,
high=10,
size=(1500, X_train.shape[1]))
X_train = numpy.vstack([X_train, other_x]).astype(dtype=numpy.int32)
y_train = numpy.hstack([
y_train,
numpy.zeros(500) + 3,
numpy.zeros(500) + 4,
numpy.zeros(500) + 5
]).astype(dtype=numpy.int32)
self.assertEqual(y_train.shape, (X_train.shape[0], ))
y_train = y_train % 2
# Classic
gbm = LGBMClassifier()
gbm.fit(X_train, y_train)
exp = gbm.predict_proba(X_test)
onx = to_onnx(gbm,
initial_types=[('X',
Int64TensorType([None,
X_train.shape[1]]))])
self.assertIn('ZipMap', str(onx))
oif = OnnxInference(onx)
got = oif.run({'X': X_test})
values = pandas.DataFrame(got['output_probability']).values
self.assertEqualArray(exp, values, decimal=5)
# categorical_feature=[0, 1]
train_data = Dataset(X_train,
label=y_train,
feature_name=['c1', 'c2', 'c3', 'c4'],
categorical_feature=['c1', 'c2'])
params = {
"boosting_type": "gbdt",
"learning_rate": 0.05,
"n_estimators": 2,
"objective": "binary",
"max_bin": 5,
"min_child_samples": 100,
'verbose': -1,
}
booster = lgb_train(params, train_data)
exp = booster.predict(X_test)
onx = to_onnx(booster,
initial_types=[('X',
Int64TensorType([None,
X_train.shape[1]]))])
self.assertIn('ZipMap', str(onx))
oif = OnnxInference(onx)
got = oif.run({'X': X_test})
values = pandas.DataFrame(got['output_probability']).values
self.assertEqualArray(exp, values[:, 1], decimal=5)
def lgb_f1_loss_multiclass(preds: np.ndarray,
train_data: lgb.Dataset,
clip: float = 1e-5):
"""Custom loss for optimizing f1.
Args:
preds: np.ndarray.
train_data: lgb dataset.
clip: clip values.
Returns:
lgb loss output.
"""
y_true = train_data.get_label().astype(np.int32)
preds = preds.reshape((y_true.shape[0], -1), order='F')
# softmax
preds = np.clip(softmax_ax1(preds), clip, 1 - clip)
# make ohe
y_ohe = np.zeros_like(preds)
np.add.at(y_ohe, (np.arange(y_true.shape[0]), y_true), 1)
# grad
grad = (preds - y_ohe) * preds
# hess
hess = (1 - preds) * preds * np.clip((2 * preds - y_ohe), 1e-3, np.inf)
# reshape back preds
return grad.reshape((-1, ), order='F'), hess.reshape((-1, ), order='F')
def lgb_f1_loss_multiclass(
preds: np.ndarray,
train_data: lgb.Dataset,
clip: float = 1e-5) -> Tuple[np.ndarray, np.ndarray]:
"""Custom loss for optimizing f1.
Args:
preds: Predctions.
train_data: Dataset in LightGBM format.
clip: Clump constant.
Returns:
Gradient, hessian.
"""
y_true = train_data.get_label().astype(np.int32)
preds = preds.reshape((y_true.shape[0], -1), order="F")
# softmax
preds = np.clip(softmax_ax1(preds), clip, 1 - clip)
# make ohe
y_ohe = np.zeros_like(preds)
np.add.at(y_ohe, (np.arange(y_true.shape[0]), y_true), 1)
# grad
grad = (preds - y_ohe) * preds
# hess
hess = (1 - preds) * preds * np.clip((2 * preds - y_ohe), 1e-3, np.inf)
# reshape back preds
return grad.reshape((-1, ), order="F"), hess.reshape((-1, ), order="F")
def test_lightgbm_booster_multi_classifier(self):
X = [[0, 1], [1, 1], [2, 0], [1, 2], [-1, 2], [1, -2]]
X = numpy.array(X, dtype=numpy.float32)
y = [0, 1, 0, 1, 2, 2]
data = Dataset(X, label=y)
model = train(
{
'boosting_type': 'gbdt',
'objective': 'multiclass',
'n_estimators': 3,
'min_child_samples': 1,
'num_class': 3
}, data)
update_registered_converter(WrappedLightGbmBoosterClassifier,
'WrappedLightGbmBoosterClassifier',
calculate_lightgbm_output_shapes,
convert_lightgbm,
parser=lightgbm_parser,
options={
'zipmap': [False, True],
'nocl': [False, True]
})
update_registered_converter(WrappedBooster,
'WrappedBooster',
calculate_lightgbm_output_shapes,
convert_lightgbm,
parser=lightgbm_parser,
options={
'zipmap': [False, True],
'nocl': [False, True]
})
update_registered_converter(Booster,
'LightGbmBooster',
calculate_lightgbm_output_shapes,
convert_lightgbm,
parser=lightgbm_parser)
model_onnx = to_onnx(
model,
initial_types=[('X', FloatTensorType([None, 2]))],
options={WrappedLightGbmBoosterClassifier: {
'zipmap': False
}},
target_opset={
'': TARGET_OPSET,
'ai.onnx.ml': TARGET_OPSET_ML
})
try:
sess = InferenceSession(model_onnx.SerializeToString())
except InvalidArgument as e:
raise AssertionError("Cannot load model\n%r" %
str(model_onnx)) from e
expected = model.predict(X)
res = sess.run(None, {'X': X})
assert_almost_equal(expected, res[1])
def Dist_Objective(predt: np.ndarray, data: lgb.Dataset):
"""A customized objective function to train each distributional parameter using custom gradient and hessian.
"""
target = data.get_label()
# When num_class!= 0, preds has shape (n_obs, n_dist_param).
# Each element in a row represents a raw prediction (leaf weight, hasn't gone through response function yet).
preds_expectile = predt.reshape(-1,
Expectile.n_dist_param(),
order="F")
# Weights
if data.get_weight() == None:
# Use 1 as weight if no weights are specified
weights = np.ones_like(target, dtype=float)
else:
weights = data.get_weight()
# Initialize Gradient and Hessian Matrices
grad = np.zeros(shape=(len(target), len(Expectile.expectiles)))
hess = np.zeros(shape=(len(target), len(Expectile.expectiles)))
for i in range(len(Expectile.expectiles)):
grad[:, i] = Expectile.gradient_expectile(
y=target,
expectile=preds_expectile[:, i],
tau=Expectile.expectiles[i],
weights=weights)
hess[:,
i] = Expectile.hessian_expectile(y=target,
expectile=preds_expectile[:,
i],
tau=Expectile.expectiles[i],
weights=weights)
# Reshaping
grad = grad.ravel(order="F")
hess = hess.ravel(order="F")
return grad, hess
def __call__(self, pred: np.ndarray,
dtrain: lgb.Dataset) -> Tuple[str, float, bool]:
label = dtrain.get_label()
weights = dtrain.get_weight()
if label.shape[0] != pred.shape[0]:
pred = pred.reshape((label.shape[0], -1), order='F')
label = label.astype(np.int32)
pred = self.bw_func(pred)
# for weighted case
try:
val = self.metric_func(label, pred, sample_weight=weights)
except TypeError:
val = self.metric_func(label, pred)
# TODO: what if grouped case
return 'Opt metric', val, self.greater_is_better
def test_lightgbm_booster_classifier(self):
from lightgbm import Dataset, train as lgb_train
X = numpy.array([[0, 1], [1, 1], [2, 0], [1, 2]], dtype=numpy.float32)
y = [0, 1, 0, 1]
data = Dataset(X, label=y)
model = lgb_train({'boosting_type': 'rf', 'objective': 'binary',
'n_estimators': 3, 'min_child_samples': 1,
'subsample_freq': 1, 'bagging_fraction': 0.5,
'feature_fraction': 0.5},
data)
model_onnx = to_onnx(model, X, verbose=0, rewrite_ops=True,
target_opset=TARGET_OPSET)
self.assertNotEmpty(model_onnx)
def lgb_mape(preds: np.ndarray, lgb_train: Dataset) -> Tuple[str, float, bool]:
"""
Mean average precision error metric for evaluation in lightgbm.
Args:
preds: Array of predictions
lgb_train: LightGBM Dataset
Returns:
Tuple of error name (str) and error (float)
"""
labels = lgb_train.get_label()
mask = labels != 0
return "mape", (np.fabs(labels - preds) / labels)[mask].mean(), False
def lgb_pr_auc(preds: np.ndarray,
lgb_train: Dataset) -> Tuple[str, float, bool]:
"""
Precision Recall AUC (Area under Curve) of our prediction in lightgbm
Args:
preds: Array of predictions
lgb_train: LightGBM Dataset
Returns:
Precision Recall AUC (Area under Curve)
"""
labels = lgb_train.get_label()
precision, recall, _ = precision_recall_curve(labels, preds)
return "pr_auc", auc(recall, precision), True
def top2_accuray_lgb(
predt: np.ndarray,
data: lgb.Dataset,
threshold: float = 0.5,
) -> Tuple[str, float, bool]:
s_0 = 31
s_1 = int(len(predt) / s_0)
predt = predt.reshape(s_0, s_1)
y = data.get_label()
p = predt.argsort(axis=0)[::-1, :]
accuracy = ((y == p[0, :]) | (y == p[1, :])).mean()
# # eval_name, eval_result, is_higher_better
return 'top2_accuray', float(accuracy), True
def Dist_Metric(predt: np.ndarray, data: lgb.Dataset):
"""A customized evaluation metric that evaluates the predictions using the negative log-likelihood.
"""
target = data.get_label()
is_higher_better = False
# Using a custom objective function, the custom metric receives raw predictions which need to be transformed
# with the corresponding response function.
predt = predt.reshape(-1, Gaussian.n_dist_param(), order="F")
preds_location = Gaussian.param_dict()["location"](predt[:, 0])
preds_scale = Gaussian.param_dict()["scale"](predt[:, 1])
nll = -np.nansum(norm.logpdf(x=target, loc=preds_location, scale=preds_scale))
return "NegLogLikelihood", nll, is_higher_better
def lgb_mape_exp(preds: np.ndarray,
lgb_train: Dataset) -> Tuple[str, float, bool]:
"""
Mean average precision error metric for evaluation in lightgbm.
NOTE: This will exponentiate the predictions first, in the case where our actual is logged
Args:
preds: Array of predictions
lgb_train: LightGBM Dataset
Returns:
Tuple of error name (str) and error (float)
"""
labels = lgb_train.get_label()
mask = labels != 0
return "mape_exp", (np.fabs(labels - np.exp(preds)) /
labels)[mask].mean(), False
def corr_sharpe_lgb(
time_id_fold,
y_pred: np.array,
dtrain: lgb.Dataset,
) -> Tuple[str, float, bool]:
"""
Pearson correlation coefficient metric
"""
y_true = dtrain.get_label()
pd_info = pd.DataFrame({
'time_id': time_id_fold,
'y_pred': y_pred,
'y_true': y_true
})
sharpe_corr = calculate_corr(pd_info, sharpe=True)[0]
return 'pearson_corr_sharpe', sharpe_corr, True
def test_onnxrt_python_lightgbm_categorical_iris_booster3_real(self):
from lightgbm import LGBMClassifier, Dataset, train as lgb_train
iris = load_iris()
X, y = iris.data, iris.target
X = (X * 10).astype(numpy.float32)
X_train, X_test, y_train, _ = train_test_split(
X, y, random_state=11)
# Classic
gbm = LGBMClassifier()
gbm.fit(X_train, y_train)
exp = gbm.predict_proba(X_test)
onx = to_onnx(gbm.booster_, initial_types=[
('X', FloatTensorType([None, X_train.shape[1]]))],
target_opset=TARGET_OPSET)
self.assertIn('ZipMap', str(onx))
oif = OnnxInference(onx)
got = oif.run({'X': X_test})
values = pandas.DataFrame(got['output_probability']).values
self.assertEqualArray(exp, values, decimal=5)
# categorical_feature=[0, 1]
train_data = Dataset(
X_train, label=y_train,
feature_name=['c1', 'c2', 'c3', 'c4'],
categorical_feature=['c1', 'c2'])
params = {
"boosting_type": "gbdt", "learning_rate": 0.05,
"n_estimators": 2, "objective": "multiclass",
"max_bin": 5, "min_child_samples": 100,
'verbose': -1, 'num_class': 3}
booster = lgb_train(params, train_data)
exp = booster.predict(X_test)
onx = to_onnx(booster, initial_types=[
('X', FloatTensorType([None, X_train.shape[1]]))],
target_opset=TARGET_OPSET)
self.assertIn('ZipMap', str(onx))
oif = OnnxInference(onx)
got = oif.run({'X': X_test})
values = pandas.DataFrame(got['output_probability']).values
self.assertEqualArray(exp, values, decimal=5)
def objective(params, n_folds=self.n_folds):
self.iteration += 1
subsample = params['boosting_type'].get('subsample', 1.0)
params['boosting_type'] = params['boosting_type']['boosting_type']
params['subsample'] = subsample
params['verbose'] = -1
for p in ['num_leaves', 'subsample_for_bin', 'min_child_samples']:
params[p] = int(params[p])
params['histogram_pool_size'] = 1024
# NOTE: Above parameter is introduced to reduce memory consumption
self.logger.debug("Parameters: {}".format(params))
start = timer()
train_set = Dataset(x_train, label=y_train)
# Perform n_folds cross validation
cv_results = cv(params,
train_set,
num_boost_round=10000,
nfold=n_folds,
early_stopping_rounds=100,
metrics='auc',
seed=self.seed)
run_time = timer() - start
# Loss must be minimized
best_score = np.max(cv_results['auc-mean'])
loss = 1 - best_score
# Boosting rounds that returned the highest cv score
n_estimators = int(np.argmax(cv_results['auc-mean']) + 1)
return {
'loss': loss,
'params': params,
'iteration': self.iteration,
'estimators': n_estimators,
'train_time': run_time,
'status': STATUS_OK
}
def fit_lightgbm(self, x, y, early_stopping_rounds):
self.model = LGBMModel(**self.optimized_params)
if early_stopping_rounds is not None:
x_valid, y_valid = train_test_split(x,
stratify=y,
shuffle=True,
test_size=self.test_size,
random_state=self.random_state)
self.model.fit(x,
y,
eval_set=Dataset(x_valid, y_valid),
early_stopping_rounds=early_stopping_rounds,
verbose=self.verbose)
else:
self.model.fit(x, y)
def Dist_Metric(predt: np.ndarray, data: lgb.Dataset):
"""A customized evaluation metric that evaluates the predictions using the negative log-likelihood.
"""
target = torch.tensor(data.get_label())
is_higher_better = False
# Using a custom objective function, the custom metric receives raw predictions which need to be transformed
# with the corresponding response function.
predt = predt.reshape(-1, Gaussian.n_dist_param(), order="F")
preds_location = Gaussian.param_dict()["location"](predt[:, 0])
preds_location = torch.tensor(preds_location, requires_grad=True)
preds_scale = Gaussian.param_dict()["scale"](predt[:, 1])
preds_scale = torch.tensor(preds_scale, requires_grad=True)
dGaussian = Normal(preds_location, preds_scale)
nll = -dGaussian.log_prob(target).nansum()
nll = nll.detach().numpy()
nll = np.round(nll, 5)
return "NegLogLikelihood", nll, is_higher_better
def Dist_Metric(predt: np.ndarray, data: lgb.Dataset):
"""A customized evaluation metric that evaluates the predictions using the negative log-likelihood.
"""
target = data.get_label()
is_higher_better = False
# Using a custom objective function, the custom metric receives raw predictions which need to be transformed
# with the corresponding response function.
preds_expectile = predt.reshape(-1,
Expectile.n_dist_param(),
order="F")
loss_expectile = []
for i in range(len(Expectile.expectiles)):
loss_expectile.append(
Expectile.expectile_loss(y=target,
expectile=preds_expectile[:, i],
tau=Expectile.expectiles[i]))
nll = np.nanmean(loss_expectile)
return "NegLogLikelihood", nll, is_higher_better
def main(verbose=True, force=False, test=False):
import datetime
IGNORE_FEATURES = []
os.makedirs(ANALYSIS_PATH, exist_ok=True)
os.makedirs(TRAIN_PATH, exist_ok=True)
raw_df_name = os.path.join(TRAIN_PATH, 'data_raw.pyt')
scaled_df_name = os.path.join(TRAIN_PATH, 'data_scaled.pyt')
st_time = datetime.datetime.now()
print('Loading the data...')
if not os.path.isfile(raw_df_name) or force:
df = read()
df.set_index(ID, inplace=True)
print('\tWriting \033[92m%s\033[0m' % (raw_df_name))
with open(raw_df_name, 'wb') as pyt:
joblib.dump(df, pyt)
else:
print('\tLoading data from \033[92m%s\033[0m' % (raw_df_name))
df = joblib.load(raw_df_name)
print('-- Took %i seconds.' %
(datetime.datetime.now() - st_time).total_seconds())
# log-scale the predictors & predictand
bins_target = np.logspace(np.log10(df[PREDICTAND].min()),
np.log10(df[PREDICTAND].max()), 20)
df[PREDICTAND] = np.log1p(df[PREDICTAND])
predictors = [c for c in df.columns if c not in ['isTrain', PREDICTAND]]
# Counts of 0s or non-0s is very different between test and train sets !
pstep = 5
percs = np.arange(pstep, 100, pstep)
calculated_cols = []
columns_then = df.columns
# Add the info relative to the leak as it affects the training / test processes
leak_file = os.path.join(TRAIN_PATH, "df_leaked_%s.pyt" % N_LAGS)
if os.path.isfile(leak_file):
df_leaked = joblib.load(leak_file)
else:
df_ = df[predictors].reset_index(level=0)
df_[PREDICTAND] = df[PREDICTAND]
df_ = df_[['ID', PREDICTAND] + predictors]
df_leaked = get_all_leak(df_, COLUMNS_LEAK, N_LAGS)
leak_cols = [c for c in df_leaked if c.startswith('leak')]
df_leaked = df_leaked[leak_cols]
with open(leak_file, 'wb') as pyt:
joblib.dump(df_leaked, pyt)
df_leaked.index = df.index
leak_cols = df_leaked.columns
df['nb_potential_leaks'] = df_leaked.notnull().sum(axis=1)
df['leak_mean'] = df_leaked.mean(axis=1).fillna(0)
df['leak_median'] = df_leaked.median(axis=1).fillna(0)
df['leak_max'] = df_leaked.max(axis=1).fillna(0)
df['leak_min'] = df_leaked.min(axis=1).fillna(0)
# Clustering on sorted dataframe (row by row) to detect similar entries
df_ = df[predictors].copy()
for row in range(len(df_)):
arr = df_.iloc[row, :]
df_.iloc[row, :] = np.sort(arr)
# Hierarchical clustering seems to have a predictive power
#distance = "euclidean"
n_clusters = 12
for distance in [
"hamming", "jaccard", "sokalmichener", "sokalsneath", "euclidean"
]:
st_time = datetime.datetime.now()
print(
'Finding \033[92m%i clusters\033[0m with \033[92m%s distance\033[0m'
% (n_clusters, distance))
dist_fname = os.path.join(TRAIN_PATH, "%s_dists.pyt" % distance)
if os.path.isfile(dist_fname):
dist = joblib.load(dist_fname)
print('-- Pairwise distance loading took %i seconds.' %
(datetime.datetime.now() - st_time).total_seconds())
else:
if distance == "euclidean":
dist = ss.distance.pdist(df_[predictors].values, distance)
else:
dist = ss.distance.pdist(df[predictors].values.astype(bool),
distance)
print('-- Pairwise distance computation took %i seconds.' %
(datetime.datetime.now() - st_time).total_seconds())
with open(dist_fname, 'wb') as pyt:
joblib.dump(dist, pyt)
ward_linkage = hierarchy.ward(dist)
tree = hierarchy.to_tree(ward_linkage)
cluster_colname = 'cluster_%s' % distance
df[cluster_colname] = hierarchy.fcluster(ward_linkage,
_get_height_at(
tree, n_clusters),
criterion="distance")
print('-- Took %i seconds.' %
(datetime.datetime.now() - st_time).total_seconds())
CATEGORICAL_FEATURES.append(cluster_colname)
sns.catplot(x=cluster_colname,
y=PREDICTAND,
data=df.groupby('isTrain').get_group(True),
kind="violin")
plt.savefig(os.path.join(ANALYSIS_PATH, '%s.png' % cluster_colname))
plt.close()
# Keep euclidean clusters as 'cluster_colname' for K-fold grouping
cluster_colname = "cluster_euclidean"
print('Mojena stopping rule')
clusters_for_plot = np.arange(1, 101)
heights = np.array(
[_get_height_at(tree, n_clusters) for n_clusters in clusters_for_plot])
plt.figure()
plt.plot(clusters_for_plot, heights, 'ko--')
plt.grid()
plt.xlabel('Number of clusters')
plt.ylabel('Dendrogram height')
plt.savefig(os.path.join(ANALYSIS_PATH, '%s_mojena.png' % cluster_colname))
plt.close()
print('Dendrogram for Euclidean distance')
dn = hierarchy.dendrogram(ward_linkage,
no_labels=True,
above_threshold_color='k')
plt.ylabel('height')
plt.xlabel('samples')
plt.savefig(
os.path.join(ANALYSIS_PATH, '%s_dendrogram.png' % cluster_colname))
plt.close()
df[predictors] = np.log1p(df[predictors])
st_time = datetime.datetime.now()
def func_agg(row):
r = row[row > 0]
return np.append([
(row > 0).sum(),
r.mean(),
(r**2).mean(),
r.std(),
r.max(),
r.min(),
r.skew(),
r.kurtosis(),
], r.quantile(q=percs / 100))
print('Computing non-zero aggregates...')
df[[
'count_nonzero',
'mean_nonzero',
'meansq_nonzero',
'std_nonzero',
'max_nonzero',
'min_nonzero',
'skew_nonzero',
'kurt_nonzero',
] + ['p%i' % p for p in percs]] = df[predictors].apply(
func_agg, axis=1, result_type="expand").fillna(0)
print('-- Took %i seconds.' %
(datetime.datetime.now() - st_time).total_seconds())
st_time = datetime.datetime.now()
def func_agg(row):
r = row[row > 0].diff().abs()
return np.append([
r.mean(),
(r**2).mean(),
r.std(),
r.max(),
r.min(),
r.skew(),
r.kurtosis(),
], r.quantile(q=percs / 100))
print('Computing diff aggregates...')
df[[
'diff_mean_nonzero',
'diff_meansq_nonzero',
'diff_std_nonzero',
'diff_max_nonzero',
'diff_min_nonzero',
'diff_skew_nonzero',
'diff_kurtosis_nonzero',
] + ['diff_p%i' % p for p in percs]] = df[predictors].apply(
func_agg, axis=1, result_type="expand").fillna(0)
print('-- Took %i seconds.' %
(datetime.datetime.now() - st_time).total_seconds())
# add occurrences (will it help ?)
print('Computing distributions...')
def func_epd(row):
epd = np.histogram(np.exp(row[row > 0].values) - 1,
bins=bins_target,
normed=True)[0]
return epd / np.sum(epd)
df[['epd_%i' % b for b in bins_target[:-1]
]] = df[predictors].apply(func_epd, axis=1,
result_type="expand").fillna(0)
columns_now = df.columns
calculated_cols.extend([c for c in columns_now if c not in columns_then])
## Scale the features
#st_time = datetime.datetime.now()
#print('Scaling (log) the features')
#for col in df.columns:
#if col not in [PREDICTAND, ID, 'isTrain']:
#df[col] = np.log(df[col] + 1)
#print('-- Took %i seconds.' % (datetime.datetime.now() - st_time).total_seconds())
df.drop(predictors, axis=1, inplace=True)
predictors = [c for c in calculated_cols if c in df.columns]
print('-- Took %i seconds.' %
(datetime.datetime.now() - st_time).total_seconds())
#with open(os.path.join(TRAIN_PATH, 'predictors_%s.pyt' % datetime.datetime.now().strftime('%Y%m%d%H')),
#'wb') as pyt:
#joblib.dump(df, pyt)
st_time = datetime.datetime.now()
print('Transforming the features')
cols_to_remove = []
cols_to_add = []
for col in predictors:
if col in CATEGORICAL_FEATURES:
print('\tFeature %s is categorical -> OneHot' % col)
transf = OneHotEncoder()
transf.fit(df[col].values.reshape(-1, 1))
res = transf.transform(df[col].values.reshape(-1, 1))
for i, ax in enumerate(res.transpose(), 1):
onehot = '{}_{}'.format(col, i)
df[onehot] = ax.toarray().squeeze()
cols_to_add.append(onehot)
cols_to_remove.append(col)
else:
print('\tFeature %s is numerical -> QuantileTransformer' % col)
try:
df[col] = QuantileTransformer().fit_transform(
df[col].values.reshape(-1, 1))
except:
print("\033[91mQuantileTransformer failed on %s\033[0m" % col)
print('-- Took %i seconds.' %
(datetime.datetime.now() - st_time).total_seconds())
#df.drop(cols_to_remove, axis=1, inplace=True)
IGNORE_FEATURES.extend(cols_to_remove)
for col in cols_to_remove:
predictors.remove(col)
calculated_cols.remove(col)
predictors.extend(cols_to_add)
# T-SNE
st_time = datetime.datetime.now()
print('Running T-SNE...')
fname = os.path.join(ANALYSIS_PATH, "tsne", "tsne.png")
os.makedirs(os.path.dirname(fname), exist_ok=True)
tsne_comps = tsne(
df[predictors + [PREDICTAND, 'isTrain']],
fname,
nb=len(df),
perplexity=40,
title=None,
visu_tsne=None,
cmap='viridis',
predictand=PREDICTAND,
binary=False,
#do_not_plot=[c for c in predictors if not c in calculated_cols + ['isTrain', PREDICTAND]],
)
with open(
os.path.join(
TRAIN_PATH, "tsne_%s.pyt" %
(datetime.datetime.now().strftime('%Y%m%d%H%M'))),
'wb') as pyt:
joblib.dump(tsne_comps, pyt)
try:
for i, tsne_ax in enumerate(tsne_comps.transpose(), 1):
df['tsne%i' % i] = tsne_ax
calculated_cols.append('tsne%i' % i)
except:
print('\033[91mWARNING ! could not add t-sne values\033[0m')
print_exc()
pass
print('-- Took %i seconds.' %
(datetime.datetime.now() - st_time).total_seconds())
analyze(df, calculated_cols, step='preprocessed')
#analyze_bivariate(df, cfgs, step='preprocessed')
df_train = select_sample(df, "train")
df_test = select_sample(df, "test")
fname = os.path.join(TRAIN_PATH, 'df_train.pyt')
print('Saving df_train to \033[92m%s\033[0m' % fname)
with open(fname, 'wb') as pyt:
joblib.dump(df_train, pyt)
predictors = [c for c in df_train.columns if c not in IGNORE_FEATURES]
predictors.remove(PREDICTAND)
X_train = df_train[predictors].values
y_train = df_train[PREDICTAND].values
X_test = df_test[predictors].values
test_rows = df_test.index
# Load the "leaked" target
leaked_target = df_leaked.loc[test_rows, leak_cols].median(axis=1)
leaked_count = df_leaked.loc[test_rows, leak_cols].notnull().sum(axis=1)
leak_inds = np.where(leaked_count > 0)[0]
#reg, _ = train_and_validate(
#df_train,
#predictors,
#PREDICTAND,
#wdir=TRAIN_PATH,
#kind='regression',
#MLP_options={'hidden_layer_sizes': (100, 100)},
#GradientBoosting_options={'max_depth': 5, 'learning_rate': 0.05, 'n_estimators': 600, 'random_state': 42},
#XGBoost_options={'max_depth': 5, 'learning_rate': 0.05, 'n_estimators': 600, 'random_state': 42},
#LightGBM_options={'max_depth': 5, 'learning_rate': 0.05, 'n_estimators': 600, 'random_state': 42, 'verbose': -1, 'num_leaves': 124},
#RandomForest_options={'max_depth': None, 'n_estimators': 900, 'max_features': 1, 'min_samples_leaf': 3, 'min_samples_split': 10, 'criterion': 'mse', 'random_state': 42},
#)
#os.makedirs(OUTPUT_PATH, exist_ok=True)
#for name, regdict in reg.items():
#model = regdict['model']
#fname = os.path.join(OUTPUT_PATH, '%s.csv' % name)
#y_pred = model.predict(X_test)
#y_pred = np.expm1(y_pred)
##y_pred[leak_inds] = leaked_target.values[leak_inds]
#df_result = pd.DataFrame({ID: df_test.index,
#PREDICTAND: y_pred})
#df_result.to_csv(fname, index=False)
#print('Wrote prediction file: \033[94;1m%s\033[0m' % fname)
def save_model(model, name, y_pred=None, replace_leak=False):
if model is not None:
fname = os.path.join(TRAIN_PATH, "%s.pyt" % name)
os.makedirs(TRAIN_PATH, exist_ok=True)
with open(fname, "wb") as pyt:
joblib.dump({'model': model}, pyt)
print('\tSaved model to \033[92m%s\033[0m' % fname)
fname = os.path.join(OUTPUT_PATH, "%s.csv" % name)
if y_pred is None:
y_pred = model.predict(X_test)
y_pred = np.expm1(y_pred)
if replace_leak:
y_pred[leak_inds] = leaked_target.values[leak_inds]
fname = fname.replace('.csv', '_leak.csv')
df_result = pd.DataFrame({ID: df_test.index, PREDICTAND: y_pred})
df_result.to_csv(fname, index=False)
print('\tSaved prediction to \033[92m%s\033[0m' % fname)
from lightgbm import Dataset
from lightgbm import train as train_lgb
nfolds = 10
#folds = KFold(n_splits=nfolds, shuffle=True, random_state=21)
folds = GroupKFold(n_splits=nfolds)
y_pred_xgb = np.zeros(len(X_test))
y_train_xgb = np.zeros(len(X_train))
y_pred_lgbm = np.zeros(len(X_test))
y_train_lgbm = np.zeros(len(X_train))
lgb_params = {
'task': 'train',
'boosting_type': 'gbdt',
'objective': 'regression',
'metric': {'mse'},
'num_leaves': 124,
'learning_rate': 0.05,
'feature_fraction': 0.8,
'verbose': -1,
'num_boost_round': 15000,
'early_stopping_rounds': 100,
'nthread': 26
}
def _rmse_func(predictions, ground_truth):
return np.sqrt(mean_squared_error(predictions, ground_truth))
def rmse(predictions, train_data):
labels = train_data.get_label()
return 'RMSE', _rmse_func(predictions, labels), False
for ifold, (trn_idx, val_idx) in enumerate(
folds.split(X_train, y_train, df_train[cluster_colname].values)):
print("Fold nb. %i" % ifold)
lgb_train = Dataset(data=X_train[trn_idx, :],
label=y_train[trn_idx],
feature_name=predictors)
lgb_val = Dataset(data=X_train[val_idx, :],
label=y_train[val_idx],
feature_name=predictors)
reg = XGBRegressor(n_estimators=600,
max_depth=5,
learning_rate=0.05,
random_state=42)
reg.fit(df_train[predictors].iloc[trn_idx, :].values,
df_train[[PREDICTAND]].iloc[trn_idx, :].values.squeeze())
pred_fold = reg.predict(df_train[predictors].iloc[val_idx].values)
print('\t[XGBoost] oof RMSE is: \033[92m%.4f\033[0m' % np.sqrt(
mean_squared_error(
df_train[[PREDICTAND]].iloc[val_idx].values.squeeze(),
pred_fold)))
y_train_xgb += reg.predict(X_train) / nfolds
y_pred_xgb += reg.predict(X_test) / nfolds
reg = train_lgb(lgb_params,
lgb_train,
num_boost_round=15000,
early_stopping_rounds=100,
verbose_eval=100,
valid_sets=[lgb_train, lgb_val],
feval=rmse)
y_pred = reg.predict(X_train[val_idx, :],
num_iteration=reg.best_iteration)
score = np.sqrt(mean_squared_error(y_train[val_idx], y_pred))
print('\t[LGBM] Best iteration: \033[92m%i\033[0m' %
reg.best_iteration)
print('\t[LGBM] oof RMSE is: \033[92m%.4f\033[0m' % score)
y_train_lgbm += reg.predict(X_train,
num_iteration=reg.best_iteration) / nfolds
y_pred_lgbm += reg.predict(X_test,
num_iteration=reg.best_iteration) / nfolds
save_model(None, "LightGBM_folded", y_pred_lgbm, replace_leak=True)
save_model(None, "XGBoost_folded", y_pred_xgb)
save_model(None, "LightGBM_folded", y_pred_lgbm)
save_model(None, "XGB-LGBM_folded", 0.5 * (y_pred_xgb + y_pred_lgbm))
gsDict = {}
## AdaBoost
#print('\033[1mGridSearch - AdaBoostRegressor\033[0m')
#reg_base = DecisionTreeRegressor()
#reg = AdaBoostRegressor(reg_base, random_state=42)
#ada_param_grid = {
#"base_estimator__criterion": ["mse", "mae"],
#"base_estimator__splitter": ["best", "random"],
#"algorithm": ["SAMME", "SAMME.R"],
#"n_estimators": [2, 10, 50],
#"learning_rate": [0.001, 0.01, 0.1]}
#gsAdaBoost = GridSearchCV(reg, param_grid=ada_param_grid,
#cv=nfolds, scoring="neg_mean_squared_error",
#n_jobs=20, verbose=1)
#gsAdaBoost.fit(X_train, y_train)
#ada_best = gsAdaBoost.best_estimator_
#print('\tBest score: \033[92m%.4f\033[0m' % gsAdaBoost.best_score_)
#ada_best.fit(X_train, y_train)
#save_model(ada_best, "AdaBoost")
#gsDict["AdaBoost"] = gsAdaBoost
## ExtraTrees
#print('\033[1mGridSearch - ExtraTreesRegressor\033[0m')
#reg = ExtraTreesRegressor()
## Search grid for optimal parameters
#ex_param_grid = {
#"max_depth": [None],
#"max_features": [1, 3, 10],
#"min_samples_split": [2, 3, 10],
#"min_samples_leaf": [1, 3, 10],
#"bootstrap": [False],
#"n_estimators": [100, 300, 900],
#"criterion": ["mse", "mae"]}
#gsExtraTrees = GridSearchCV(reg, param_grid=ex_param_grid,
#cv=nfolds, scoring="neg_mean_squared_error",
#n_jobs=20, verbose=1)
#gsExtraTrees.fit(X_train, y_train)
#etc_best = gsExtraTrees.best_estimator_
#print('\tBest score: \033[92m%.4f\033[0m' % gsExtraTrees.best_score_)
#etc_best.fit(X_train, y_train)
#save_model(etc_best, "ExtraTrees")
#gsDict["ExtraTrees"] = gsExtraTrees
## RF Parameters
#print('\033[1mGridSearch - RandomForestRegressor\033[0m')
#reg = RandomForestRegressor()
## Search grid for optimal parameters
#rf_param_grid = {
#"max_depth": [None, 4, 5],
#"max_features": [1, 3, 10],
#"min_samples_split": [2, 3, 10],
#"min_samples_leaf": [1, 3, 10],
#"bootstrap": [False],
#"n_estimators": [100, 300, 900],
#"criterion": ["mse", "mae"]}
#gsRandomForest = GridSearchCV(
#reg, param_grid=rf_param_grid,
#cv=nfolds, scoring="neg_mean_squared_error",
#n_jobs=36, verbose=1)
#gsRandomForest.fit(X_train, y_train)
#rfc_best = gsRandomForest.best_estimator_
#print('\tBest score: \033[92m%.4f\033[0m' % gsRandomForest.best_score_)
#for key in rf_param_grid.keys():
#print('\t\t%s: \033[92m%s\033[0m' % (key, getattr(rfc_best, key, '-')))
#rfc_best.fit(X_train, y_train)
#save_model(rfc_best, "RandomForest")
#gsDict["RandomForest"] = gsRandomForest
## Gradient boosting
#print('\033[1mGridSearch - GradientBoostingRegressor\033[0m')
#reg = GradientBoostingRegressor()
#gb_param_grid = {
#'loss' : ["ls", "lad", "huber"],
#'n_estimators' : [600, 300, 900],
#'learning_rate': [0.1, 0.05, 0.01],
#'max_depth': [5, 4, 6],
#'min_samples_leaf': [10, 50],
#'max_features': ["sqrt", "auto"]
#}
#gsGradientBoosting = GridSearchCV(
#reg, param_grid=gb_param_grid,
#cv=nfolds, scoring="neg_mean_squared_error",
#n_jobs=36, verbose=1)
#gsGradientBoosting.fit(X_train, y_train)
#gbc_best = gsGradientBoosting.best_estimator_
#print('\tBest score: \033[92m%.4f\033[0m' % gsGradientBoosting.best_score_)
#for key in gb_param_grid.keys():
#print('\t\t%s: \033[92m%s\033[0m' % (key, getattr(gbc_best, key, '-')))
#gbc_best.fit(X_train, y_train)
#save_model(gbc_best, "GradientBoosting")
#gsDict["GradientBoosting"] = gsGradientBoosting
# Gradient boosting
print('\033[1mGridSearch - XGBRegressor\033[0m')
reg = XGBRegressor()
xgb_param_grid = {
'n_estimators': [600, 300, 900],
'learning_rate': [0.1, 0.05, 0.01],
'max_depth': [5, 4, 6],
'missing': [None, 0.],
'booster': ["gbtree", "gblinear", "dart"],
}
gsXGBoost = GridSearchCV(reg,
param_grid=xgb_param_grid,
cv=nfolds,
scoring="neg_mean_squared_error",
n_jobs=36,
verbose=1)
gsXGBoost.fit(X_train, y_train)
gbc_best = gsXGBoost.best_estimator_
print('\tBest score: \033[92m%.4f\033[0m' % gsXGBoost.best_score_)
for key in xgb_param_grid.keys():
print('\t\t%s: \033[92m%s\033[0m' % (key, getattr(gbc_best, key, '-')))
gbc_best.fit(X_train, y_train)
save_model(gbc_best, "XGBoost")
gsDict["XGBoost"] = gsXGBoost
