def fit_model(self, X_train, y_train, X_test, y_test):
clf = XGBRegressor(learning_rate=self.learning_rate,
n_estimators=self.n_estimators,
max_depth=self.max_depth,
min_child_weight=self.min_child_weight,
gamma=self.gamma,
subsample=self.subsample,
colsample_bytree=self.colsample_bytree,
objective=self.objective,
nthread=self.nthread,
scale_pos_weight=self.scale_pos_weight,
reg_alpha=self.reg_alpha,
reg_lambda=self.reg_lambda,
seed=self.seed)
clf.fit(X_train, y_train)
# y_pre = clf.predict(X_test)
# y_pro = clf.predict_proba(X_test)[:, 1]
# print
# "pred_leaf=T AUC Score : %f" % metrics.roc_auc_score(y_test, y_pro)
# print("pred_leaf=T Accuracy : %.4g" % metrics.accuracy_score(y_test, y_pre))
new_feature = clf.apply(X_train)
X_train_new = self.mergeToOne(X_train, new_feature)
new_feature_test = clf.apply(X_test)
X_test_new = self.mergeToOne(X_test, new_feature_test)
print
"Training set sample number remains the same"
return X_train_new, y_train, X_test_new, y_test
def cbd_model(cbd_df,cbd_finalinput):
'''
function that creates model from the cbd dataframe and returns the predicted
number of crimes for the next three days
'''
X_cbd=cbd_df[['year', 'month', 'day', 'tmax', 'tmin', 'consumer_price_index',
'gdp_millions_2007', 'seasonally_adjusted_unemployment',
'unadjusted_unemployment', 'Possession, cocaine ',
'Heroin, possession ', 'Heroin Price Canada',
'day_segment_1200pm-1159pm', 'day_of_week_Monday',
'day_of_week_Saturday', 'day_of_week_Sunday', 'day_of_week_Thursday',
'day_of_week_Tuesday', 'day_of_week_Wednesday']]
y_cbd=cbd_df['number_of_crimes']
scaler = StandardScaler()
scaler.fit(X_cbd) # Don't cheat - fit only on training data
X_cbd = scaler.transform(X_cbd)
cbd_input_scaled = scaler.transform(cbd_finalinput)
xgb=XGBRegressor(base_score=0.5, booster='gbtree', colsample_bylevel=1,
colsample_bytree=1, gamma=0, learning_rate=0.1, max_delta_step=0,
max_depth=3, min_child_weight=1, missing=None, n_estimators=100,
n_jobs=1, nthread=None, objective='reg:linear', random_state=0,
reg_alpha=0, reg_lambda=1, scale_pos_weight=1, seed=None,
silent=True, subsample=1)
xgb.fit(X_cbd,y_cbd)
predict_cbd=xgb.predict(cbd_input_scaled)
return predict_cbd
def XGB_reg_evaluation(individual, evaluation_method='roll_win'):
'''
evaluation_method : can be roll_win, mse
'''
if evaluation_method == 'roll_win':
trainNumber = individual[6] # the train num
param = {
'eta': individual[0],
'silent': True,
'objective': "reg:linear",
'nthread': -1,
'min_child_weight': individual[1],
'max_depth': individual[2],
'subsample': individual[3],
'colsample_bylevel': individual[4],
'seed': 0
}
roll_win_mseValue = 0
for i in xrange(N_validation):
trainingX, trainingY = trainX[(trainNum - (i + 1) * window - trainNumber):(trainNum - (i + 1) * window),:],\
trainY[(trainNum - (i + 1) * window - trainNumber):(trainNum - (i + 1) * window)]
testingX, testingY= trainX[(trainNum - (i + 1) * window):(trainNum - i * window),:], \
trainY[(trainNum - (i + 1) * window):(trainNum - i * window)]
dtrain = xgb.DMatrix(data=trainingX, label=trainingY)
bst = xgb.train(params=param,
dtrain=dtrain,
num_boost_round=individual[5])
testingX = xgb.DMatrix(testingX)
roll_win_mseValue += sum(
(testingY - bst.predict(testingX))**2) / window
roll_win_mseValue /= N_validation
return (roll_win_mseValue, )
if evaluation_method == 'mse':
### The cross validation evaluation
N_SPLITS = N_splits
kf = KFold(n_splits=N_SPLITS)
cv_mseValue = 0
fc = XGBRegressor(learning_rate=individual[0],
n_estimators=individual[5],
silent=True,
objective="reg:linear",
nthread=-1,
gamma=0,
min_child_weight=individual[1],
max_depth=individual[2],
subsample=individual[3],
colsample_bylevel=individual[4],
seed=0)
for train, test in kf.split(trainX):
fc.fit(trainX[train, :], trainY[train])
cv_mseValue += sum(
(trainY[test] - fc.predict(trainX[test, :]))**2) / len(test)
cv_mseValue = cv_mseValue / N_SPLITS
return (cv_mseValue, )
print "There is no evaluation method for %s" % evaluation_method
raise Exception("evaluation_method is not valid")
def go(data_dict,feats_to_use, params={"seed":0,"silent":False,"n_jobs":-1},
parameter_tuning=False):
'''
if with_gpu:
xgb = XGBRegressor(seed=0, silent=False, tree_method='gpu_hist', n_gpus=-1)
else:
xgb = XGBRegressor(seed=0, silent=False, n_jobs=-1)
'''
X_train=data_dict['X_train'][feats_to_use].copy()
y_train=data_dict['y_train'].copy()
X_test=data_dict['X_test'][feats_to_use].copy()
X_val=data_dict['X_val'][feats_to_use].copy()
y_val=data_dict['y_val'].copy()
if parameter_tuning:
fit_params={
"early_stopping_rounds":10,
"eval_metric" : "rmse",
"eval_set" : [(X_val,y_val)]}
xgb=XGBRegressor()
train_val_features=pd.concat([X_train,X_val])
train_val_labels=pd.concat([y_train,y_val])
test_fold = np.zeros(train_val_features.shape[0]) # initialize all index to 0
test_fold[:X_train.shape[0]] = -1 # set index of training set to -1, indicating not to use it in validation
ps=PredefinedSplit(test_fold=test_fold)
X_train=data_dict['X_train'][feats_to_use]
y_train=data_dict['y_train']
X_test=data_dict['X_test'][feats_to_use]
grid=GridSearchCV(xgb,params,fit_params=fit_params,scoring=RMSE , cv=ps, verbose=32, n_jobs=-1)
start=time.time()
grid.fit(train_val_features,train_val_labels)
elapsed=time.time()-start
print (elapsed)
print ('best params:',grid.best_params_)
print ('best score:',grid.best_score_)
return grid.best_params_, grid.best_estimator_
else:
xgb=XGBRegressor(**params)
print (xgb)
print ('start xgboost training')
start=time.time()
eval_set=[(X_val,y_val)]
xgb.fit(X_train,y_train, eval_set=eval_set,eval_metric='rmse',early_stopping_rounds=30)
elapsed=time.time()-start
print (elapsed)
data_dict['y_pred']=np.exp(xgb.predict(X_test))-1
#generate submission
data_dict['X_test']['item_cnt_month']=data_dict['y_pred']
test=pd.read_csv('test.csv')
submission=pd.merge(test,data_dict['X_test'],
on=['shop_id','item_id'],how='left')[['ID','item_cnt_month']]
return submission, xgb
class my_model:
def __init__(self, d):
self.linear_reg = linear_model.Ridge()
self.xgb_reg = XGBRegressor(max_depth=7)
self.d = d
def fit(self, X, y):
self.linear_reg.fit(X[:, 0].reshape(-1, 1), y)
self.l_reg_res = self.linear_reg.predict(X[:, 0].reshape(-1, 1))
self.xgb_reg.fit(X[:, 1:], y - self.l_reg_res)
X_nn = np.hstack([
X,
self.xgb_reg.predict(X[:, 1:]).reshape(-1, 1),
self.l_reg_res.reshape(-1, 1)
])
return X_nn
def predict(self, X):
if isinstance(X[0, -1], str):
for i in range(X.shape[0]):
X[i, -1] = self.d[X[i, -1]]
X = X.astype(np.float64, copy=False)
X_nn_final = np.hstack([
X,
self.xgb_reg.predict(X[:, 1:]).reshape(-1, 1),
self.linear_reg.predict(X[:, 1].reshape(-1, 1)).reshape(-1, 1)
])
return X_nn_final
def run_xgb(output_train, df_X_train, df_Y_train, output_test, df_X_test,
df_Y_test):
xgb_estimator = XGBRegressor()
param_grid = {
'nthread': [4], #when use hyperthread, xgboost may become slower
'objective': ['reg:linear'],
'learning_rate': [.03, 0.05, .07], #so called `eta` value
'max_depth': [5, 6, 7],
'min_child_weight': [4],
'silent': [1],
'subsample': [0.7],
'colsample_bytree': [0.7],
'n_estimators': [30]
}
opt_pars = {"score": None, "alpha": None}
xgb_grid = GridSearchCV(xgb_estimator, param_grid)
xgb_grid.fit(df_X_train, df_Y_train.cnt)
r2_train = xgb_grid.best_score_
opt_pars = xgb_grid.best_params_
# n_estimators = 30,max_features='log2',bootstrap=True, max_depth=None
xgb_opt = XGBRegressor(random_state=1).set_params(**opt_pars)
xgb_opt.fit(df_X_train, df_Y_train.cnt)
r2_train = xgb_opt.score(df_X_train, df_Y_train.cnt)
r2_test = xgb_opt.score(df_X_test, df_Y_test.cnt)
result = df_proc.compare_results("XGBoost", xgb_opt, output_train,
df_X_train, output_test, df_X_test)
return {
"r2": [r2_train, r2_test],
"R2": [result[1], result[2]],
"plot": result[0]
}
class XGBWrapper_regr(object):
"""
A wrapper for xgboost model so that we will have a single api for various models.
"""
def __init__(self):
self.model = XGBRegressor()
def fit(self, X_train, y_train, X_valid=None, y_valid=None, X_holdout=None, y_holdout=None, params=None):
self.model = self.model.set_params(**params)
eval_set = [(X_train, y_train)]
if X_valid is not None:
eval_set.append((X_valid, y_valid))
if X_holdout is not None:
eval_set.append((X_holdout, y_holdout))
self.model.fit(X=X_train, y=y_train,
eval_set=eval_set, eval_metric='rmse',
verbose=params['verbose'], early_stopping_rounds=params['early_stopping_rounds'])
scores = self.model.evals_result()
self.best_score_ = {k: {m: m_v[-1] for m, m_v in v.items()} for k, v in scores.items()}
# self.best_score_ = {k: {m: n if m != 'cappa' else -n for m, n in v.items()} for k, v in self.best_score_.items()}
self.feature_importances_ = self.model.feature_importances_
def predict(self, X_test):
return self.model.predict(X_test)
def xgboostmodel(self):
df = pd.read_csv(datafile, encoding='utf-8', index_col=0)
print(df.shape)
traindata = df.iloc[:, :].values
x = traindata[:, :-1]
y = traindata[:, -1]
x_train, x_test, y_train, y_test = train_test_split(
x, y, train_size=0.7) # list
if self.params is None:
params = {'max_depth': 80, 'n_estimators': 512}
else:
params = self.params
raw_model = XGBRegressor(max_depth=128,
n_estimators=768,
learning_rate=0.01,
silence=False)
raw_model.fit(x_train, y_train)
raw_model.save_model(self.model_file)
pred = raw_model.predict(x_test)
self.true = y_test
self.pred = pred
self.show_save_figure(fig_path=self.fig_path,
modelname=self.job_name,
detal_idx=500)
t_mean = self.cal_mean(self.true)
p_mean = self.cal_mean(self.pred)
self.save_result(self.result_path, true_mean=t_mean, pred_mean=p_mean)
def train_xg_boost(params):
xg_model = XGBRegressor(n_estimators=int(params['n_estimators']), learning_rate=params['eta'], n_jobs=-1,
max_depth=int(params['max_depth']), gamma=params['gamma'], colsample_bytree=params['colsample_bytree'],
min_child_weight=params['min_child_weight'], reg_alpha=params['xg_reg_alpha'], subsample=params['subsample'],
reg_lambda=params['xg_reg_lambda']
)
# In[ ]:
xg_model.fit(X_train.values, y_train.values)
training_values = xg_model.predict(X_train.values)
print(training_values)
training_rmse = math.sqrt(mean_squared_error(y_train, training_values))
print("training_rmse", training_rmse)
validation_values = xg_model.predict(X_validtn.values)
validation_rmse = math.sqrt(mean_squared_error(y_validtn, validation_values))
print("validation_rmse", validation_rmse)
"""test_submission = pd.DataFrame()
test_submission["Score"] = xg_model.predict(combined_test_data)
test_submission.to_excel('submission4.xlsx', index=False)"""
return {
'loss': validation_rmse,
'status': STATUS_OK,
'eval_time': time.time(),
}
class XGBRegressorMetaPrim(primitive):
def __init__(self, random_state=0):
super(XGBRegressorMetaPrim, self).__init__(name='XGBRegressorMeta')
self.hyperparams = []
self.type = 'ensemble'
self.description = "XGBoost is an optimized distributed gradient boosting library designed to be highly efficient, flexible and portable."
self.hyperparams_run = {'default': True}
self.random_state = random_state
self.model = XGBRegressor(random_state=self.random_state, n_jobs=5)
self.accept_type = 'xgb'
def can_accept(self, data):
return self.can_accept_c(data, 'Regression')
def is_needed(self, data):
# data = handle_data(data)
return True
def fit(self, data):
data = handle_data(data)
self.model.fit(data['X'], data['Y'])
def produce(self, data):
output = handle_data(data)
output['predictions'] = self.model.predict(output['X'])
output['X'] = pd.DataFrame(output['predictions'], columns=[self.name+"Pred"])
final_output = {0: output}
return final_output
def __train_model(self, features):
combo_list = [
['available_year_avg', 'min_nights_year_avg', 'price_year_avg']
# ['available_winter_avg', 'min_nights_winter_avg', 'price_winter_avg'],
# ['available_spring_avg', 'min_nights_spring_avg', 'price_spring_avg'],
# ['available_summer_avg', 'min_nights_summer_avg', 'price_summer_avg']
]
for combo in combo_list:
X_base = features.drop([
'price_year_avg', 'price_winter_avg', 'price_spring_avg', 'price_summer_avg', 'price_fall_avg',
'available_year_avg', 'available_winter_avg', 'available_spring_avg', 'available_summer_avg', 'available_fall_avg',
'min_nights_year_avg', 'min_nights_winter_avg', 'min_nights_spring_avg', 'min_nights_summer_avg', 'min_nights_fall_avg'
], axis=1)
X_base[combo[0]] = features[combo[0]]
X_base[combo[1]] = features[combo[1]]
y = features[combo[2]]
X_train, X_test, y_train, y_test = train_test_split(X_base, y, test_size=.25, random_state=42, shuffle=True)
model = XGBRegressor(
objective='reg:squarederror',
learning_rate=0.1,
max_depth=8,
n_estimators=200,
cv=5,
n_jobs=-1
)
model.fit(X_train, y_train)
self.logger.info('Gradient boost model:')
self.logger.info(f'Target label: {combo[2]}')
self.logger.info(f'R^2: {model.score(X_test, y_test)}')
self.logger.info(f'MAE: {mean_absolute_error(y_test, model.predict(X_test))}')
return model
def over_sample(train, test, feat):
predictors = [x for x in train.columns if x not in ['ID', 'y']]
groups = list(train[feat].unique())
result = None
for name in groups:
train_temp = pd.concat([train, train[train[feat] == name]])
test_temp = test[test[feat] == name]
model = XGBRegressor(max_depth=4,
learning_rate=0.0045,
n_estimators=1250,
silent=True,
objective='reg:linear',
nthread=-1,
min_child_weight=1,
max_delta_step=0,
subsample=0.93,
seed=27)
model.fit(train_temp[predictors], train_temp['y'])
pred = model.predict(test_temp[predictors])
if result is None:
result = pd.DataFrame({'ID': test_temp['ID'].values, 'y': pred})
else:
result = pd.concat([
result,
pd.DataFrame({
'ID': test_temp['ID'].values,
'y': pred
})
])
result.sort_values('ID', inplace=True)
return result
def generate_XGB_model(train_df):
train_df.drop(['conversionTime'], axis=1, inplace=True)
print 'Train And Fix Missing App Count Value...'
train_df, xgb_appcount = train_model_for_appcounts(train_df)
joblib.dump(xgb_appcount, 'XGB_missing.model')
'''print 'Train And Fix Missing Age Value...'
train_df, xgb_age = train_model_for_age(train_df)
joblib.dump(xgb_age, 'XGB_age.model')'''
train_df.drop(['marriageStatus', 'haveBaby', 'sitesetID', 'positionType'],
axis=1,
inplace=True)
print 'Done'
print train_df.info()
print train_df.describe()
print train_df.isnull().sum()
train_np = train_df.as_matrix()
y = train_np[:, 0]
X = train_np[:, 1:]
print 'Train Xgboost Model...'
start_time = datetime.datetime.now()
xbg_clf = XGBRegressor(n_estimators=100,
max_depth=6,
objective="binary:logistic",
silent=False)
xbg_clf.fit(X, y)
end_time = datetime.datetime.now()
print 'Training Done..., Time Cost: %d' % ((end_time - start_time).seconds)
model_df = pd.DataFrame({
'columns': list(train_df.columns)[1:],
'values': xbg_clf.feature_importances_
})
print model_df
return xbg_clf
def get_ntree():
rmse_t_total, rmse_v_total = [], []
for ntree in range(10, 500, 10):
xgb_base = XGBRegressor(objective='reg:linear',
n_estimators=ntree,
random_state=1234,
silent=0,
booster='gbtree',
eval_metric='rmse')
rmse_t_1, rmse_v_1 = [], []
print('此时 ntree = %s' % ntree)
for train, test in get_cv(y=y_train, n_splits=5, random_state=42):
X_t, y_t = X_train[train], y_train[train]
X_v, y_v = X_train[test], y_train[test]
xgb_base.fit(X_t, y_t)
y_t_pre = xgb_base.predict(X_t)
y_v_pre = xgb_base.predict(X_v)
rmse_t_each = np.sqrt(mean_squared_error(y_t, y_t_pre))
rmse_v_each = np.sqrt(mean_squared_error(y_v, y_v_pre))
rmse_t_1.append(rmse_t_each)
rmse_v_1.append(rmse_v_each)
rmse_t = np.mean(rmse_t_1)
rmse_v = np.mean(rmse_v_1)
rmse_t_total.append(rmse_t)
rmse_v_total.append(rmse_v)
return rmse_t_total, rmse_v_total
def xgboost_single_pred(self):
x_train = self.x_train
y_train = self.y_train
x_test = self.x_test
y_test = self.y_test
self.y_pred_all_xgb = []
y_train = list(y_train)
xgboost_clf = XGBRegressor(learning_rate=0.1, n_estimators=75)
for i in range(len(x_test)):
xgboost_clf.fit(x_train, y_train)
x_test_one = x_test.iloc[i:i + 1]
y_test_one = xgboost_clf.predict(x_test_one)
self.y_pred_all_xgb.append(list(y_test_one)[0])
x_train = x_train.append(x_test_one)
y_train.append(y_test[i])
xgboost_mse = mean_squared_error(self.y_test, self.y_pred_all_xgb)
xgboost_rmse = np.sqrt(xgboost_mse)
y_pred_all_xgb = pd.DataFrame(list(self.y_pred_all_xgb))
ratio_single_xgb = pd.DataFrame(list(self.y_test)) / y_pred_all_xgb
return xgboost_rmse, y_pred_all_xgb, ratio_single_xgb
def fit_model_split(self, X_train, y_train, X_test, y_test):
##X_train_1用于生成模型 X_train_2用于和新特征组成新训练集合
X_train_1, X_train_2, y_train_1, y_train_2 = train_test_split(
X_train, y_train, test_size=0.6, random_state=0)
clf = XGBRegressor(learning_rate=self.learning_rate,
n_estimators=self.n_estimators,
max_depth=self.max_depth,
min_child_weight=self.min_child_weight,
gamma=self.gamma,
subsample=self.subsample,
colsample_bytree=self.colsample_bytree,
objective=self.objective,
nthread=self.nthread,
scale_pos_weight=self.scale_pos_weight,
reg_alpha=self.reg_alpha,
reg_lambda=self.reg_lambda,
seed=self.seed)
clf.fit(X_train_1, y_train_1)
# y_pre = clf.predict(X_train_2)
# y_pro = clf.predict_proba(X_train_2)[:, 1]
# print
# "pred_leaf=T AUC Score : %f" % metrics.roc_auc_score(y_train_2, y_pro)
# print
# "pred_leaf=T Accuracy : %.4g" % metrics.accuracy_score(y_train_2, y_pre)
new_feature = clf.apply(X_train_2)
X_train_new2 = self.mergeToOne(X_train_2, new_feature)
new_feature_test = clf.apply(X_test)
X_test_new = self.mergeToOne(X_test, new_feature_test)
print
"Training set of sample size 0.4 fewer than before"
return X_train_new2, y_train_2, X_test_new, y_test
def fit_model(self, data, target, test):
clf = XGBRegressor(learning_rate=self.learning_rate,
n_estimators=self.n_estimators,
max_depth=self.max_depth,
min_child_weight=self.min_child_weight,
gamma=self.gamma,
subsample=self.subsample,
colsample_bytree=self.colsample_bytree,
objective=self.objective,
nthread=self.nthread,
scale_pos_weight=self.scale_pos_weight,
reg_alpha=self.reg_alpha,
reg_lambda=self.reg_lambda,
seed=self.seed)
data = np.array(data).astype(float)
scaler = MinMaxScaler()
temp = scaler.fit(data)
data = scaler.transform(data)
test = scaler.transform(test)
target = scaler.fit_transform(target)
clf.fit(data, target)
new_feature = clf.apply(data)
new_test = clf.apply(test)
X_train_new = self.mergeToOne(pd.DataFrame(data), new_feature)
X_test_new = self.mergeToOne(pd.DataFrame(test), new_test)
X_train_new = pd.DataFrame(X_train_new)
X_test_new = pd.DataFrame(X_test_new)
return X_train_new, target, X_test_new
def FI_xgb_sklearn():
X, y = load_traindata(encodetype='le')
cols = list(X.columns)
rndcol = np.random.randn(X.shape[0])
X = np.column_stack((X, rndcol))
cols.append('random')
xgb1 = XGBRegressor(learning_rate=0.01,
n_estimators=3320,
max_depth=3,
min_child_weight=4,
colsample_bytree=0.8,
subsample=0.8,
importance_type='total_gain',
objective='reg:linear',
n_jobs=-1,
random_state=0,
seed=27,
silent=True)
xgb1.fit(X, y)
imp = sorted(list(zip(cols, xgb1.feature_importances_)),
key=lambda t: abs(t[1]),
reverse=True)
imp = pd.DataFrame(imp, columns=['Feature', 'Importance'])
rnd_idx = np.argwhere(imp['Feature'] == 'random')[0][0]
print(imp.iloc[:rnd_idx + 1, :])
return imp
def xgt_regressor(lr, max_d, estimators, X_train, X_test, y_train, y_test, obj):
rmse = 10000
for i in lr:
for j in max_d:
for k in estimators:
clf=XGBRegressor(learning_rate=i,
n_estimators=k,
max_depth=j,
min_child_weight=1,
gamma=1,
subsample=0.5,
colsample_bytree=0.8,
objective=obj,
nthread=4,
scale_pos_weight=1,
missing=np.nan)
clf.fit(X_train,y_train)
y_pred=clf.predict(X_test)
a,b,c = pred_eval(y_pred,y_test)
if a < rmse:
b_lr = i
b_d = j
b_e = k
rmse = a
clf_b = clf
return clf_b, (b_lr, b_d, b_e)
def xgbt_base_rmse_mode(train_input, train_target, test_input, test_target):
param = {
'n_estimators': 10,
'learning_rate': 0.01,
}
adj_params = {
'n_estimators': [10, 50, 100, 200, 300, 400, 500, 1000],
'learning_rate': [0.01, 0.1, 1]
}
xgbt = XGBRegressor(**param)
cv = RepeatedKFold(n_splits=10, n_repeats=3, random_state=1)
cscv = GridSearchCV(xgbt,
adj_params,
scoring='neg_mean_absolute_error',
cv=cv,
n_jobs=-1)
cscv.fit(train_input, train_target)
xgbt = XGBRegressor(**cscv.best_params_)
xgbt.fit(train_input, train_target.ravel())
predicted = xgbt.predict(test_input)
xgbt_base_rmse = np.sqrt(metrics.mean_squared_error(
test_target, predicted))
print("xgbt_base_rmse: ", xgbt_base_rmse)
#print ("RMSE:", np.sqrt(metrics.mean_squared_error(test_target, predicted)))
return xgbt_base_rmse
def learn_model(X_train, y_train, X_valid, y_valid):
t1 = time()
model = XGBRegressor(max_depth=7, n_estimators=500)
model.fit(X_train, y_train, eval_metric="rmse", eval_set=[(X_train, y_train), (X_valid, y_valid)], verbose=True, early_stopping_rounds=10)
t2 = time()
print('Total of training time: ', t2 - t1)
return model
def apply_model(self,
feature_names,
cv_type=None,
search_type=None,
scorer=None):
self.cv_type = cv_type
self.search_type = search_type
self.scorer = scorer
if cv_type is None:
print("Seed:", self.seed)
x_gb = XGBRegressor(learning_rate=0.1,
n_estimators=300,
random_state=self.seed)
x_gb.fit(self.X_train, self.y_train)
else:
if search_type == "random":
parameter_grid = self._get_random_parameter_grid()
print("Seed:", self.seed)
x_gb_search = RandomizedSearchCV(
estimator=XGBRegressor(n_estimators=300,
random_state=self.seed),
param_distributions=parameter_grid,
scoring=self._get_scorer(),
n_iter=150,
cv=self._get_cv(),
iid=False,
random_state=self.seed,
n_jobs=-1)
x_gb_search.fit(self.X_train, self.y_train)
x_gb = x_gb_search.best_estimator_
mean_test_score = x_gb_search.cv_results_["mean_test_score"]
std_test_score = x_gb_search.cv_results_["std_test_score"]
print(max(mean_test_score),
std_test_score[np.argmax(mean_test_score)])
print(x_gb)
elif search_type == "smac":
smac = self._get_smac()
try:
incumbent = smac.optimize()
finally:
incumbent = smac.solver.incumbent
x_gb = XGBRegressor(
learning_rate=0.1,
n_estimators=300,
seed=self.seed,
max_depth=incumbent["max_depth"],
min_child_weight=incumbent["min_child_weight"],
gamma=incumbent["gamma"],
subsample=incumbent["subsample"],
colsample_bytree=incumbent["colsample_bytree"])
x_gb.fit(self.X_train, self.y_train)
print(x_gb)
else:
raise ValueError("search_type must be either random or smac.")
train_prediction, test_prediction = self.apply_predict(x_gb)
return train_prediction, test_prediction
def xgb_regressor(x, y):
model = XGBRegressor(n_estimators=33,
learning_rate=0.1,
subsample=0.6,
max_depth=1,
objective='rank:pairwise',
random_state=0)
model.fit(x, y)
return model
def get_feat_imp(train,ID='id',target='price_doc'):
predictors = [x for x in train.columns if x not in [ID,target]]
model = XGBRegressor( max_depth=5, learning_rate=0.05, n_estimators=385,
silent=True, objective='reg:linear', nthread=-1, min_child_weight=1,
max_delta_step=0, subsample=0.93, seed=27)
model.fit(train[predictors],train[target])
feat_imp = pd.Series(model.booster().get_fscore(),index=predictors).sort_values(ascending=False)
return feat_imp
def cv_test(train, cv=5):
t0 = time.time()
target = 'y'
predictors = [x for x in train.columns if x not in ['ID', 'y']]
train_X = train[predictors]
train_Y = train[target]
mean_r2 = []
kf = KFold(len(train_Y), n_folds=cv, shuffle=True, random_state=520)
for i, (train_index, test_index) in enumerate(kf):
x_train = train_X.iloc[train_index]
x_test = train_X.iloc[test_index]
y_train = train_Y.iloc[train_index]
y_test = train_Y.iloc[test_index]
lgb_model = LGBMRegressor(boosting_type='gbdt',
num_leaves=10,
max_depth=4,
learning_rate=0.005,
n_estimators=675,
max_bin=25,
subsample_for_bin=50000,
min_split_gain=0,
min_child_weight=5,
min_child_samples=10,
subsample=0.995,
subsample_freq=1,
colsample_bytree=1,
reg_alpha=0,
reg_lambda=0,
seed=0,
nthread=-1,
silent=True)
xgb_model = XGBRegressor(max_depth=4,
learning_rate=0.0045,
n_estimators=1250,
silent=True,
objective='reg:linear',
nthread=-1,
min_child_weight=1,
max_delta_step=0,
subsample=0.93,
seed=27)
xgb_model.fit(x_train, y_train)
pred = xgb_model.predict(x_test)
from sklearn.metrics import r2_score
score = r2_score(y_test, pred)
mean_r2.append(score)
print('{0}: r2:{1}\n\n'.format(i + 1, score))
print(u'r2-均值：%s' % (np.array(mean_r2).mean()))
print('Done in %.1fs!' % (time.time() - t0))
return None
def run():
# Load data set
X_train, Y_train, X_test, submission_file_content = load_data()
Y_train = np.log(Y_train + 200)
# Cross validation
cross_validation_iterator = ShuffleSplit(n_splits=CROSS_VALIDATION_NUM,
test_size=0.1,
random_state=0)
for cross_validation_index, (train_index, valid_index) in enumerate(
cross_validation_iterator.split(X_train), start=1):
print("Working on {}/{} ...".format(cross_validation_index,
CROSS_VALIDATION_NUM))
submission_file_path = os.path.join(
SUBMISSION_FOLDER_PATH,
"submission_{}.csv".format(cross_validation_index))
if os.path.isfile(submission_file_path):
continue
model = XGBRegressor(learning_rate=0.01,
max_depth=12,
n_estimators=N_ESTIMATORS,
silent=False,
objective="reg:linear",
gamma=1,
min_child_weight=1,
subsample=0.8,
colsample_bytree=0.5,
reg_alpha=1,
seed=cross_validation_index,
nthread=-1)
model.fit(X_train[train_index],
Y_train[train_index],
eval_set=[(X_train[valid_index], Y_train[valid_index])],
eval_metric=lambda y_predicted, y_true:
("actual_mae",
mean_absolute_error(np.exp(y_true.get_label()),
np.exp(y_predicted))),
early_stopping_rounds=EARLY_STOPPING_ROUNDS,
verbose=True)
# Perform the testing procedure
Y_test = model.predict(X_test)
# Save submission to disk
if not os.path.isdir(SUBMISSION_FOLDER_PATH):
os.makedirs(SUBMISSION_FOLDER_PATH)
submission_file_content[LABEL_COLUMN_NAME] = np.exp(Y_test) - 200
submission_file_content.to_csv(submission_file_path, index=False)
# Perform ensembling
ensemble_predictions()
print("All done!")
def model(df, alpha):
X = df
y = df.pop('y')
X_train, X_test, y_train, y_test = train_test_split(X,
y,
test_size=.3,
random_state=42)
upper = _random_search(
X_train, y_train,
XGBOOSTQUANTILE(quant_alpha=1 - alpha / 2,
quant_delta=1,
quant_thres=6,
quant_var=3.2), {
'quant_delta': uniform(.01, 12),
'quant_thres': uniform(1, 12),
'quant_var': uniform(1, 12)
}).predict(X_test)
lower = _random_search(
X_train, y_train,
XGBOOSTQUANTILE(quant_alpha=alpha / 2,
quant_delta=1,
quant_thres=6,
quant_var=3.2), {
'quant_delta': uniform(.01, 12),
'quant_thres': uniform(1, 12),
'quant_var': uniform(1, 12)
}).predict(X_test)
median = _random_search(
X_train, y_train,
XGBOOSTQUANTILE(quant_alpha=.5,
quant_delta=1,
quant_thres=6,
quant_var=3.2), {
'quant_delta': uniform(.01, 12),
'quant_thres': uniform(1, 12),
'quant_var': uniform(1, 12)
}).predict(X_test)
xgbls = XGBRegressor()
xgbls.fit(X_train, y_train)
mean = xgbls.predict(X_test)
return pd.concat([
X_test.reset_index(drop=True),
y_test.reset_index(drop=True),
pd.DataFrame(upper, columns=['upper_bound']),
pd.DataFrame(lower, columns=['lower_bound']),
pd.DataFrame(mean, columns=['mean']),
pd.DataFrame(median, columns=['median'])
],
axis=1)
def xgb_regression(X_train,y_train,X_val, y_val,X_test,y_test,args):
if y_test.shape[-1] == 1:
model = XGBRegressor(
learn_rate=0.1,
max_depth=4, # 4
min_child_weight=10,
gamma=1, # 1
subsample=0.8,
colsample_bytree=0.8,
reg_alpha=0.8,
objective='reg:linear',
n_estimators=2000,
tree_method='gpu_hist',
n_gpus=-1
)
model.fit(X_train, y_train, eval_set=[(X_val, y_val)], eval_metric='rmse',
early_stopping_rounds=300)
y_pred = model.predict(X_test)
y_test = y_test.astype('float')
MSE = mean_squared_error(y_test, y_pred)
RMSE = MSE ** 0.5
return RMSE
else:
RMSEs = []
if len(y_train.shape) == 3:
y_train = [x[0] for x in y_train]
y_val = [x[0] for x in y_val]
y_test = [x[0] for x in y_test]
y_train = pd.DataFrame(y_train)
y_val = pd.DataFrame(y_val)
y_test = pd.DataFrame(y_test)
for i in range(y_test.shape[1]):
if float(max(y_val[i])) == 0 or float(max(y_train[i])) == 0 or float(max(y_test[i])) == 0:
continue
model = XGBRegressor(
learn_rate=0.1,
max_depth=4, # 4
min_child_weight=10,
gamma=1, # 1
subsample=0.8,
colsample_bytree=0.8,
reg_alpha=0.8,
objective='reg:linear',
n_estimators=2000,
tree_method='gpu_hist',
n_gpus=-1
)
model.fit(X_train, [float(k) for k in y_train[i]], eval_set=[(X_val, [float(k) for k in y_val[i]])], eval_metric='rmse',
early_stopping_rounds=300)
y_pred = model.predict(X_test)
y_test = y_test.astype('float')
MSE = mean_squared_error(y_test[i], y_pred)
RMSE = MSE ** 0.5
RMSEs.append(RMSE)
return np.mean(RMSEs)
def run_xgb(**args):
print("building xgb model:")
xgb_model = XGBRegressor()
xgb_model.fit(args["training_data"], args["training_label"])
output = xgb_model.predict(args["test_data"])
pickle.dump(xgb_model, open("xgb_testmodel.p", "wb"))
output = list(map(lambda e: round(e), output))
print(output)
pickle.dump(output, open("xgb_output.p", "wb"))
return output
def fit_model(X, y, model_name):
print('Model Fitting started: ', datetime.now())
start_time = time.time()
classifier = XGBRegressor(objective='reg:squarederror', n_jobs=8, n_estimators= 1000, verbosity= 3)
classifier.fit(X, y)
pickle.dump(classifier, open("models/{}.pickle.dat".format(model_name), 'wb'))
print('Duration Fitting: ', (time.time() - start_time))
return classifier
def xgb(x_train, y_train, x_val, y_val):
xgb = XGBRegressor(n_estimators=1000,
max_depth=10,
learning_rate=0.01,
subsample=0.8,
colsample_bytree=0.8,
random_state=2000)
xgb.fit(x_train, y_train)
result = xgb.predict(x_val)
score = mean_absolute_error(result, y_val)
return score
def run():
# Load data set
X_train, Y_train, X_test, submission_file_content = load_data()
Y_train = np.log(Y_train + 200)
# Cross validation
cross_validation_iterator = ShuffleSplit(n_splits=CROSS_VALIDATION_NUM, test_size=0.1, random_state=0)
for cross_validation_index, (train_index, valid_index) in enumerate(cross_validation_iterator.split(X_train), start=1):
print("Working on {}/{} ...".format(cross_validation_index, CROSS_VALIDATION_NUM))
submission_file_path = os.path.join(SUBMISSION_FOLDER_PATH, "submission_{}.csv".format(cross_validation_index))
if os.path.isfile(submission_file_path):
continue
model = XGBRegressor(
learning_rate=0.01,
max_depth=12,
n_estimators=N_ESTIMATORS,
silent=False,
objective="reg:linear",
gamma=1,
min_child_weight=1,
subsample=0.8,
colsample_bytree=0.5,
reg_alpha=1,
seed=cross_validation_index,
nthread=-1)
model.fit(X_train[train_index], Y_train[train_index], eval_set=[(X_train[valid_index], Y_train[valid_index])],
eval_metric=lambda y_predicted, y_true:("actual_mae", mean_absolute_error(np.exp(y_true.get_label()), np.exp(y_predicted))),
early_stopping_rounds=EARLY_STOPPING_ROUNDS, verbose=True)
# Perform the testing procedure
Y_test = model.predict(X_test)
# Save submission to disk
if not os.path.isdir(SUBMISSION_FOLDER_PATH):
os.makedirs(SUBMISSION_FOLDER_PATH)
submission_file_content[LABEL_COLUMN_NAME] = np.exp(Y_test) - 200
submission_file_content.to_csv(submission_file_path, index=False)
# Perform ensembling
ensemble_predictions()
print("All done!")
class Xgb:
def __init__(self, df, target_column='', id_column='', target_type='binary', categorical_columns=[], drop_columns=[], numeric_columns=[], num_training_rounds=500, verbose=1, sample_fraction=1.0, n_samples=1, early_stopping_rounds=None, prefix='xgb_model', scoring=None):
"""
input params:
- df (DataFrame): dataframe of training data
- target_column (string): name of target column
- id_column (string): name of id column
- target_type (string): 'linear' or 'binary'
- categorical_columns (list): list of column names of categorical data. Will perform one-hot encoding
- drop_columns (list): list of columns to drop
- numeric_columns (list): list of columns to convert to numeric
- verbose (bool): verbosity of printouts
"""
# checks for sampling
sample_fraction = float(sample_fraction)
if sample_fraction > 1:
sample_fraction = 1.0
if sample_fraction * n_samples > 1:
n_samples = round(1.0/sample_fraction)
if sample_fraction <= 0:
print('sample_fraction 0 or negative, switching to 0.1')
sample_fraction = 0.1
# if sample_fraction is results in sample smaller than 1
if round(sample_fraction * len(df)) == 0:
sample_fraction = 1.0/len(df)
# check if data is dataframe
if type(df) == pd.core.frame.DataFrame:
self.df = df
self.early_stopping_rounds = early_stopping_rounds
if target_column:
self.target_column = target_column
self.id_column = id_column
self.target_type = target_type
self.categorical_columns = categorical_columns
self.numeric_columns = numeric_columns
self.drop_columns = drop_columns
self.verbose = verbose
self.sample_fraction = sample_fraction
self.n_samples = n_samples
self.num_training_rounds = num_training_rounds
self.prefix = prefix
# init the classifier:
if self.target_type == 'binary':
self.scoring = 'auc'
self.clf = XGBClassifier(
learning_rate =0.1,
n_estimators = num_training_rounds,
subsample = 0.8,
colsample_bytree = 0.8,
objective = 'binary:logistic',
scale_pos_weight = 1,
seed = 123)
elif self.target_type == 'multiclass':
self.scoring = 'merror'
self.clf = XGBClassifier(
learning_rate =0.1,
n_estimators = num_training_rounds,
subsample = 0.8,
colsample_bytree = 0.8,
objective = 'multi:softmax',
scale_pos_weight = 1,
seed = 123)
elif self.target_type == 'linear':
self.scoring = 'rmse'
self.clf = XGBRegressor(
n_estimators = num_training_rounds,
objective = 'reg:linear'
)
# if preferred scoring metric is stated:
if scoring:
self.scoring = scoring
else:
print('please provide target column name')
else:
print('please provide pandas dataframe')
def train(self):
print('#### preprocessing ####')
self.df = self.preprocess(self.df)
print('#### training ####')
self.predictors = [x for x in self.df.columns if x not in [self.target_column, self.id_column]]
xgb_param = self.clf.get_xgb_params()
# if subsampling
if self.sample_fraction == 1.0:
df_list = [self.df]
else:
df_list = self.random_sample(df=self.df, fraction=self.sample_fraction, n_samples=self.n_samples)
print(df_list)
for idx, current_df in enumerate(df_list):
print('ITERATION ' + str(idx) + ' of ' + str(self.n_samples) +', sample_fraction=' + str(self.sample_fraction))
xgtrain = xgb.DMatrix(current_df[self.predictors], label=current_df[self.target_column], missing=np.nan)
try:
cvresult = xgb.cv(xgb_param, xgtrain, num_boost_round=self.clf.get_params()['n_estimators'], nfold=5,
metrics=[self.scoring], early_stopping_rounds=self.early_stopping_rounds, show_progress=self.verbose)
except:
try:
cvresult = xgb.cv(xgb_param, xgtrain, num_boost_round=self.clf.get_params()['n_estimators'], nfold=5,
metrics=[self.scoring], early_stopping_rounds=self.early_stopping_rounds, verbose_eval=self.verbose)
except:
xgb_param['num_class'] = len(current_df[self.target_column].unique())
cvresult = xgb.cv(xgb_param, xgtrain, num_boost_round=self.clf.get_params()['n_estimators'], nfold=5,
metrics=[self.scoring], early_stopping_rounds=self.early_stopping_rounds)
self.clf.set_params(n_estimators=cvresult.shape[0])
self.clf.fit(current_df[self.predictors], current_df[self.target_column], eval_metric=self.scoring)
#Predict training set:
train_df_predictions = self.clf.predict(current_df[self.predictors])
if self.target_type == 'binary' or self.target_type == 'multiclass':
train_df_predprob = self.clf.predict_proba(current_df[self.predictors])[:,1]
print("Accuracy : %.4g" % metrics.accuracy_score(current_df[self.target_column].values, train_df_predictions))
if self.target_type == 'binary':
print("AUC Score (Train): %f" % metrics.roc_auc_score(current_df[self.target_column], train_df_predprob))
elif self.target_type == 'linear':
print("Mean squared error: %f" % metrics.mean_squared_error(current_df[self.target_column].values, train_df_predictions))
print("Root mean squared error: %f" % np.sqrt(metrics.mean_squared_error(current_df[self.target_column].values, train_df_predictions)))
filename = self.prefix + '_' + str(idx) + '.pkl'
self.save(filename)
def predict(self, test_df, return_multi_outputs=False, return_mean_std=False):
print('### predicting ###')
print('## preprocessing test set')
if self.id_column in test_df:
ids = test_df[self.id_column]
if self.target_column in test_df.columns:
targets = test_df[self.target_column]
self.test_df = self.preprocess(test_df, train=False)
if self.id_column in test_df:
self.test_df[self.id_column] = ids
if self.target_column in test_df.columns:
self.test_df[self.target_column] = targets
for col in self.predictors:
if col not in self.test_df.columns:
self.test_df[col] = np.nan
# prediction
print('## predicting from test set')
output_list = []
output = None
for idx, ns in enumerate(range(self.n_samples)):
if self.n_samples == 1:
xgb = self
if self.target_type == 'binary':
output = xgb.clf.predict_proba(self.test_df[self.predictors])[:,1]
elif self.target_type == 'linear':
output = xgb.clf.predict(self.test_df[self.predictors])
else:
try:
filename = self.prefix + '_' + str(idx) + '.pkl'
xgb = self.load(filename)
if self.target_type == 'binary':
output = xgb.clf.predict_proba(self.test_df[self.predictors])[:,1]
elif self.target_type == 'linear':
output = xgb.clf.predict(self.test_df[self.predictors])
output_list.append(list(output))
except IOError:
print('no file found, skipping')
# average the outputs if n_samples is more than one
if self.n_samples == 1:
self.output = output
try:
self.multi_outputs = [list(output)]
except:
self.multi_outputs = None
else:
self.output = np.mean(output_list, axis=0)
self.multi_outputs = output_list
if return_multi_outputs:
return self.multi_outputs
elif return_mean_std:
return (self.output, np.std(output_list, axis=0))
else:
return self.output
def feature_importance(self, num_print=10, display=True):
feature_importance = sorted(list(self.clf.booster().get_fscore().items()), key = operator.itemgetter(1), reverse=True)
impt = pd.DataFrame(feature_importance)
impt.columns = ['feature', 'importance']
print(impt[:num_print])
if display:
impt[:num_print].plot("feature", "importance", kind="barh", color=sns.color_palette("deep", 3))
def preprocess(self, df, train=True):
# one hot encoding of categorical variables
print('## one hot encoding of categorical variables')
for col in self.categorical_columns:
if self.verbose:
print('one hot encoding: ', col)
df = pd.concat([df, pd.get_dummies(df[col]).rename(columns=lambda x: col+'_'+str(x))], axis=1)
df = df.drop([col], axis=1)
# if training, determine columns to be removed
if train:
# drop columns that are too sparse to be informative
self.cols_to_remove = []
print('## dropping columns below sparsity threshold')
for col in df.columns:
nan_cnt = 0
for x in df[col]:
try:
if np.isnan(x):
nan_cnt += 1
except:
pass
if nan_cnt/float(len(df[col])) > 0.6: # arbitrary cutoff, if more than 60% missing then drop
if self.verbose:
print('will drop', col)
self.cols_to_remove.append(col)
# drop columns that have no standard deviation (not informative)
print('## dropping columns with no variation')
for col in df.columns:
if df[col].dtype == 'int64' or df[col].dtype == 'float64':
if df[col].std() == 0:
print('will drop', col)
self.cols_to_remove.append(col)
if self.verbose and self.cols_to_remove:
print('dropping the following columns:', self.cols_to_remove)
df = df.drop(self.cols_to_remove, axis=1)
if self.verbose:
print('## DataFrame shape is now:', df.shape)
# convert to numerical where possible
#print('## converting numerical data to numeric dtype')
#df = df.convert_objects(convert_numeric=True)
# convert columns specified to be int and float
for col in self.numeric_columns:
if self.verbose:
print('converting', col)
df[col] = pd.to_numeric(df[col], errors='coerce')
if self.verbose:
print(df[col].dtype)
df = df.drop(self.drop_columns, axis=1)
# drop all those that are object type
print('## dropping non-numerical columns')
for col in df.columns:
if df[col].dtype == 'int64' or df[col].dtype == 'float64' or df[col].dtype == 'bool':
pass
else:
if self.verbose:
print('dropping because not int, float, or bool:', col)
df = df.drop([col], axis=1)
return df
def _to_int(self, num):
try:
return int(num)
except:
return
def _to_float(self, num):
try:
return float(num)
except:
return
def random_sample(self, df, fraction=0.2, n_samples=None):
"""
splits into random samples
- n_samples: how many samples you want returned (default = All)
- fraction : what fraction of data to include in the sample (default = 0.2)
"""
print('constructing random samples')
num_rows = len(df)
len_sample = round(fraction * num_rows)
# create list of slice index lists
indices = range(0,num_rows)
slice_list = []
tmp_idx_list = []
while len(indices) > 0:
while len(tmp_idx_list) < len_sample and len(indices) > 0:
idx = indices.pop(random.randrange(len(indices)))
tmp_idx_list.append(idx)
slice_list.append(tmp_idx_list)
tmp_idx_list = []
# get slices
sample_list = []
for s in range(n_samples):
try:
sample_list.append(df.loc[slice_list[s],:])
except:
pass
return sample_list
def write_csv(self, filename, include_actual=False):
"""
write results to csv
- include actual: if actual values are known for test set, and we want to print them
"""
with open(filename, 'wb') as csvfile:
writer = csv.writer(csvfile)
headers = [self.id_column, self.target_column]
if include_actual:
headers.append('actual')
writer.writerow(headers)
try:
for idx, value in enumerate(self.output):
test_id = self.test_df[self.id_column][idx]
test_output = self.output[idx]
to_write = [test_id, test_output]
if include_actual:
to_write.append(self.test_df[self.target_column][idx])
writer.writerow(to_write)
print('results written to ' + filename)
except:
print('write_csv failed')
def save(self, filename='xgb.pkl'):
joblib.dump(self, filename)
def load(self, model_file='xgb.pkl'):
xgb = joblib.load(model_file)
return xgb
pd.Series(rf_age_valid_pred).isnull().sum()
statistics.mean(error_df.sqerr)
len(rf_age_valid_pred)
len(age_valid_Y)
pd.crosstab(pd.Series(rf_age_valid_pred).apply(lambda x: round(x)),age_valid_Y)
## XGB for age prediction
from xgboost.sklearn import XGBRegressor
xgb = XGBRegressor(max_depth=6, learning_rate=0.2, n_estimators=100,
objective='reg:linear', subsample=0.5, colsample_bytree=0.5, seed=321)
eval_set = [(mvt_train_X.drop(['age', 'gender'], axis=1), age_train_Y), (mvt_valid_X.drop(['age', 'gender'], axis=1),age_valid_Y)]
xgb.fit(mvt_train_X.drop(['age', 'gender'], axis=1), age_train_Y, eval_set = eval_set, eval_metric= 'rmse',early_stopping_rounds= 10, verbose=1)
xgb_age_valid_pred = xgb.predict(mvt_valid_X.drop(['age', 'gender'], axis=1))
## ADAboost for age prediction
from sklearn.ensemble import AdaBoostRegressor
ada = AdaBoostRegressor(n_estimators=50,learning_rate=0.1,loss='linear', random_state=321)
ada.fit(mvt_train_X.drop(['age', 'gender'], axis=1), age_train_Y.values,)
ada_age_valid_pred = ada.predict(mvt_valid_X.drop(['age', 'gender'], axis=1))
len(ada_age_valid_pred)
len(age_valid_Y)
error_df = pd.DataFrame(pd.Series(ada_age_valid_pred), columns=['pred'])
error_df.reset_index( inplace=True)
act_df = pd.DataFrame(age_valid_Y)
gsearch7.best_params_
#{'reg_alpha': 0.09}
xgb1.set_params(reg_alpha= 0.09)
#parameters of algorithm
xgb1=XGBRegressor(base_score=0.5, booster='gbtree', colsample_bylevel=1,
colsample_bytree=0.7, gamma=0, learning_rate=0.5, max_delta_step=0,
max_depth=7, min_child_weight=4, missing=None, n_estimators=1000,
n_jobs=1, nthread=4, objective='reg:gamma', random_state=0,
reg_alpha=0.09, reg_lambda=1, scale_pos_weight=1, seed=1048,
silent=True, subsample=0.86)
###################
#Fit the algorithm on the data
xgb1.fit(train_x, train_y,eval_metric='rmse')
### train vs test
pre = xgb1.predict(test_x)
plt.figure(figsize=(16,9))
plt.style.use('ggplot')
plt.plot(pre,label='predict_load1')
plt.plot(np.array(test_y),label='test_load1')
plt.title('Test_prediction MAE=%s' % str(np.sum(abs(pre-test_y))/len(pre)))
plt.legend(loc='upper left')
plt.savefig("D:\\load Forecasting\\plot\\TraiVsTest.jpg")
#####Newdata
pre1=xgb1.predict(load1_test.drop('load1',1))
plt.figure(figsize=(16,9))
class Xgb:
def __init__(self, df, target_column='', id_column='', target_type='binary', categorical_columns=[], drop_columns=[], numeric_columns=[], num_training_rounds=500, verbose=1, early_stopping_rounds=None):
"""
input params:
- df (DataFrame): dataframe of training data
- target_column (string): name of target column
- id_column (string): name of id column
- target_type (string): 'linear' or 'binary'
- categorical_columns (list): list of column names of categorical data. Will perform one-hot encoding
- drop_columns (list): list of columns to drop
- numeric_columns (list): list of columns to convert to numeric
- verbose (bool): verbosity of printouts
"""
if type(df) == pd.core.frame.DataFrame:
self.df = df
self.early_stopping_rounds = early_stopping_rounds
if target_column:
self.target_column = target_column
self.id_column = id_column
self.target_type = target_type
self.categorical_columns = categorical_columns
self.numeric_columns = numeric_columns
self.drop_columns = drop_columns
self.verbose = verbose
self.num_training_rounds = num_training_rounds
# init the classifier
if self.target_type == 'binary':
self.scoring = 'auc'
self.clf = XGBClassifier(
learning_rate =0.1,
n_estimators = num_training_rounds,
subsample = 0.8,
colsample_bytree = 0.8,
objective = 'binary:logistic',
scale_pos_weight = 1,
seed = 123)
elif self.target_type == 'linear':
self.scoring = 'rmse'
self.clf = XGBRegressor(
n_estimators = num_training_rounds,
objective = 'reg:linear'
)
else:
print('please provide target column name')
else:
print('please provide pandas dataframe')
def train(self):
print('#### preprocessing ####')
self.df = self.preprocess(self.df)
print('#### training ####')
self.predictors = [x for x in self.df.columns if x not in [self.target_column, self.id_column]]
xgb_param = self.clf.get_xgb_params()
xgtrain = xgb.DMatrix(self.df[self.predictors], label=self.df[self.target_column], missing=np.nan)
try:
cvresult = xgb.cv(xgb_param, xgtrain, num_boost_round=self.clf.get_params()['n_estimators'], nfold=5,
metrics=[self.scoring], early_stopping_rounds=self.early_stopping_rounds, show_progress=self.verbose)
except:
try:
cvresult = xgb.cv(xgb_param, xgtrain, num_boost_round=self.clf.get_params()['n_estimators'], nfold=5,
metrics=[self.scoring], early_stopping_rounds=self.early_stopping_rounds, verbose_eval=self.verbose)
except:
cvresult = xgb.cv(xgb_param, xgtrain, num_boost_round=self.clf.get_params()['n_estimators'], nfold=5,
metrics=[self.scoring], early_stopping_rounds=self.early_stopping_rounds)
self.clf.set_params(n_estimators=cvresult.shape[0])
self.clf.fit(self.df[self.predictors], self.df[self.target_column],eval_metric=self.scoring)
#Predict training set:
train_df_predictions = self.clf.predict(self.df[self.predictors])
if self.target_type == 'binary':
train_df_predprob = self.clf.predict_proba(self.df[self.predictors])[:,1]
print("Accuracy : %.4g" % metrics.accuracy_score(self.df[self.target_column].values, train_df_predictions))
print("AUC Score (Train): %f" % metrics.roc_auc_score(self.df[self.target_column], train_df_predprob))
elif self.target_type == 'linear':
print("Mean squared error: %f" % metrics.mean_squared_error(self.df[self.target_column].values, train_df_predictions))
print("Root mean squared error: %f" % np.sqrt(metrics.mean_squared_error(self.df[self.target_column].values, train_df_predictions)))
def predict(self, test_df):
print('### predicting ###')
print('## preprocessing test set')
if self.id_column in test_df:
ids = test_df[self.id_column]
if self.target_column in test_df.columns:
targets = test_df[self.target_column]
self.test_df = self.preprocess(test_df, train=False)
if self.id_column in test_df:
self.test_df[self.id_column] = ids
if self.target_column in test_df.columns:
self.test_df[self.target_column] = targets
for col in self.predictors:
if col not in self.test_df.columns:
self.test_df[col] = np.nan
if self.target_type == 'binary':
self.output = self.clf.predict_proba(self.test_df[self.predictors])[:,1]
elif self.target_type == 'linear':
self.output = self.clf.predict(self.test_df[self.predictors])
return self.output
def feature_importance(self, num_print=10, display=True):
feature_importance = sorted(list(self.clf.booster().get_fscore().items()), key = operator.itemgetter(1), reverse=True)
impt = pd.DataFrame(feature_importance)
impt.columns = ['feature', 'importance']
print(impt[:num_print])
if display:
impt[:num_print].plot("feature", "importance", kind="barh", color=sns.color_palette("deep", 3))
def preprocess(self, df, train=True):
# one hot encoding of categorical variables
print('## one hot encoding of categorical variables')
for col in self.categorical_columns:
if self.verbose:
print('one hot encoding: ', col)
df = pd.concat([df, pd.get_dummies(df[col]).rename(columns=lambda x: col+'_'+str(x))], axis=1)
df = df.drop([col], axis=1)
# if training, determine columns to be removed
if train:
# drop columns that are too sparse to be informative
self.cols_to_remove = []
print('## dropping columns below sparsity threshold')
for col in df.columns:
nan_cnt = 0
for x in df[col]:
try:
if np.isnan(x):
nan_cnt += 1
except:
pass
if nan_cnt/float(len(df[col])) > 0.6: # arbitrary cutoff, if more than 60% missing then drop
if self.verbose:
print('will drop', col)
self.cols_to_remove.append(col)
# drop columns that have no standard deviation (not informative)
print('## dropping columns with no variation')
for col in df.columns:
if df[col].dtype == 'int64' or df[col].dtype == 'float64':
if df[col].std() == 0:
print('will drop', col)
self.cols_to_remove.append(col)
if self.verbose and self.cols_to_remove:
print('dropping the following columns:', self.cols_to_remove)
df = df.drop(self.cols_to_remove, axis=1)
if self.verbose:
print('## DataFrame shape is now:', df.shape)
# convert to numerical where possible
#print('## converting numerical data to numeric dtype')
#df = df.convert_objects(convert_numeric=True)
# convert columns specified to be int and float
for col in self.numeric_columns:
if col not in self.cols_to_remove:
if self.verbose:
print('converting', col)
df[col] = pd.to_numeric(df[col], errors='coerce')
if self.verbose:
print(df[col].dtype)
# drop those marked for dropping
df = df.drop(self.drop_columns, axis=1)
# drop all those that are object type
print('## dropping non-numerical columns')
for col in df.columns:
if df[col].dtype == 'int64' or df[col].dtype == 'float64' or df[col].dtype == 'bool':
pass
else:
if self.verbose:
print('dropping because not int, float, or bool:', col)
df = df.drop([col], axis=1)
return df
def _to_int(self, num):
try:
return int(num)
except:
return
def _to_float(self, num):
try:
return float(num)
except:
return
def write_csv(self, filename, include_actual=False):
"""
write results to csv
- include actual: if actual values are known for test set, and we want to print them
"""
with open(filename, 'wb') as csvfile:
writer = csv.writer(csvfile)
headers = [self.id_column, self.target_column]
if include_actual:
headers.append('actual')
writer.writerow(headers)
for idx, value in enumerate(self.output):
test_id = self.test_df[self.id_column][idx]
test_output = self.output[idx]
to_write = [test_id, test_output]
if include_actual:
to_write.append(self.test_df[self.target_column][idx])
writer.writerow(to_write)
def save(self, filename='xgb.pkl'):
joblib.dump(self, filename)
