[英]High error machine learning regressor algorithm in Python - XGBOOST Regressor
我有一個 dataframe 和來自佛羅里達的真實 state 數據,它包括單間公寓和建築物數據:
'TRUE_SITE_CITY': The city where the building is. variable: Miami, Aventura...;
'CONDO_FLAG': If it is a condominium or not, variable: yes/no;
'BEDROOM_COUNT': Number of total bethrooms, variable: integuer,
'BUILDING_actual_AREA': The area of the entire building, or apartment in the case that there are only one apartment or house. variable: integuer;
'FLOOR_COUNT': Number of the floors that the building has;
'DOR_CODE_CUR': the type of the building. Variable: categorical;
'UNIT_COUNT': Number of apartments or houses in the building. Variable: integuer;
'YEAR_BUILT': Year that the building or house or apartment was build: Variable: categorical;
'public_transport_min_distance': I have calculated the nearest stations of the public transport;
'Price': The variable that I want to predict.
我進行了探索性數據分析,我刪除了一些具有 null 值的數據和一些不正確的數據。 我也刪除了帶有異常值的值。
價格列(目標列)的基本統計:
我檢查了分類特征,每個特征都有足夠的變量將它們保存在 model 中。
我已經做了一個管道來為分類值制作一個熱編碼器,並為數值制作一個標准標准化。 在其中我包含了 XGBOOST 回歸:
from xgboost import XGBRegressor
from sklearn.model_selection import cross_val_score
from sklearn.model_selection import cross_validate
from sklearn import metrics
from sklearn import preprocessing, feature_extraction
from sklearn.pipeline import Pipeline
from sklearn import preprocessing, feature_extraction
from sklearn.pipeline import make_pipeline, make_union
from mlxtend.feature_selection import ColumnSelector
from sklearn.preprocessing import StandardScaler
from category_encoders import OneHotEncoder
x_numeric = df_x[['BEDROOM_COUNT','BATHROOM_COUNT',
'HALF_BATHROOM_COUNT', 'FLOOR_COUNT','UNIT_COUNT','public_transport_min_distance','BUILDING_actual_AREA']]
x_categorical = df_x[['TRUE_SITE_CITY','CONDO_FLAG','YEAR_BUILT']]
categorical_col = x_categorical.columns
numeric_col = x_numeric.columns
estimator_pipeline = Pipeline([
('procesador', procesing_pipeline),
('estimador', estimator)
])
score2 = cross_validate(estimator_pipeline, X= df_x, y= df_y, scoring=scoring,return_train_score=False, cv=5,n_jobs=2)
但我得到了一個很高的錯誤。 價格的平均值幾乎是 200.000,我得到的錯誤是:
我已經使用 RFE 完成了特征選擇,但我也得到了一個很高的錯誤。
我也運行它做 RandomizedSearchCV
from sklearn.model_selection import RandomizedSearchCV
params = {"estimator__learning_rate" : [0.05, 0.10, 0.15, 0.20, 0.25, 0.30 ] ,
"estimator__max_depth" : [ 3, 4, 5, 6, 8, 10, 12, 15],
"estimator__min_child_weight" : [ 1, 3, 5, 7 ],
"estimator__gamma" : [ 0.0, 0.1, 0.2 , 0.3, 0.4 ],
"estimator__colsample_bytree" : [ 0.3, 0.4, 0.5 , 0.7 ] }
random_search = RandomizedSearchCV(
estimator=estimator_pipeline,
param_distributions=params, cv=5, refit=True,
scoring="neg_mean_squared_error", n_jobs= 3,
return_train_score=True,
n_iter=50)
但我獲得了類似的錯誤值。
我能做什么?
我這邊的一些評論/建議。 希望它會幫助你。
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