분류(1) - XGBoost

Gino·2022년 6월 12일
1

머신러닝

목록 보기
2/34

이 글은 파이썬 머신러닝 완벽 가이드 책 내용을 기반으로 정리했습니다.
내용출처 : 파이썬 머신러닝 완벽가이드

  • 분류는 명시적 정답이 있는 학습(지도학습)의 대표적인 유형이다. 기존의 데이터로 학습하고 미지의 데이터의 레이블 값을 예측하는 것이다.
  • XG Boost 는 트리 기반 앙상블 학습(여러 머신러닝 모델 연결한 학습)에서 가장 각광받고 있는 알고리즘 중 하나로, 캐글에서 많은 수상자가 XGBoost를 이용하면서 널리 알려졌다. GBM에 기반하고 있지만 GBM의 단점인 느린 수행 시간 및 과적합 규제 부재 등의 문제를 해결했다. 
import xgboost; print(xgboost.__version__)
1.5.2

모델 : Python Wrapper XGBoost 적용
데이터 : 위스콘신 Breast Cancer

0. 공통 : 필요한 라이브러리

import pandas as pd
import numpy as np
from sklearn.datasets import load_breast_cancer
from sklearn.model_selection import train_test_split

# 워닝 무시
import warnings
warnings.filterwarnings('ignore')

Case1. Python Wrapper xgb 적용

import xgboost as xgb   # Python wrapper xgb
from xgboost import plot_importance

1. 데이터 로드

# 위스콘신 유방암 데이터 로드
dataset = load_breast_cancer()
dataset
{'data': array([[1.799e+01, 1.038e+01, 1.228e+02, ..., 2.654e-01, 4.601e-01,
         1.189e-01],
        [2.057e+01, 1.777e+01, 1.329e+02, ..., 1.860e-01, 2.750e-01,
         8.902e-02],
        [1.969e+01, 2.125e+01, 1.300e+02, ..., 2.430e-01, 3.613e-01,
         8.758e-02],
        ...,
        [1.660e+01, 2.808e+01, 1.083e+02, ..., 1.418e-01, 2.218e-01,
         7.820e-02],
        [2.060e+01, 2.933e+01, 1.401e+02, ..., 2.650e-01, 4.087e-01,
         1.240e-01],
        [7.760e+00, 2.454e+01, 4.792e+01, ..., 0.000e+00, 2.871e-01,
         7.039e-02]]),
 'target': array([0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0,
        0, 0, 1, 0, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0, 1, 1, 1, 1, 0, 1, 0, 0,
        1, 1, 1, 1, 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0,
        1, 1, 1, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 1, 1, 0, 1,
        1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0, 1, 0,
        0, 1, 0, 0, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1,
        1, 1, 0, 1, 1, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 1,
        1, 0, 1, 1, 0, 0, 0, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 0, 0, 1, 0, 0,
        0, 0, 1, 0, 0, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 0, 0, 0, 1, 1, 0, 0,
        1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 1, 1, 0, 0, 1, 0, 1, 1,
        1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1,
        1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1,
        1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 0, 0,
        0, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0,
        0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0,
        1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 0, 0, 1, 1,
        1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 0,
        1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 1, 1,
        1, 0, 1, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0,
        1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1,
        1, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 0, 0, 1, 0, 1, 0, 1, 1,
        1, 1, 1, 0, 1, 1, 0, 1, 0, 1, 0, 0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1,
        1, 1, 1, 1, 1, 0, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
        1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1]),
 'frame': None,
 'target_names': array(['malignant', 'benign'], dtype='<U9'),
 'DESCR': '.. _breast_cancer_dataset:\n\nBreast cancer wisconsin (diagnostic) dataset\n--------------------------------------------\n\n**Data Set Characteristics:**\n\n    :Number of Instances: 569\n\n    :Number of Attributes: 30 numeric, predictive attributes and the class\n\n    :Attribute Information:\n        - radius (mean of distances from center to points on the perimeter)\n        - texture (standard deviation of gray-scale values)\n        - perimeter\n        - area\n        - smoothness (local variation in radius lengths)\n        - compactness (perimeter^2 / area - 1.0)\n        - concavity (severity of concave portions of the contour)\n        - concave points (number of concave portions of the contour)\n        - symmetry\n        - fractal dimension ("coastline approximation" - 1)\n\n        The mean, standard error, and "worst" or largest (mean of the three\n        worst/largest values) of these features were computed for each image,\n        resulting in 30 features.  For instance, field 0 is Mean Radius, field\n        10 is Radius SE, field 20 is Worst Radius.\n\n        - class:\n                - WDBC-Malignant\n                - WDBC-Benign\n\n    :Summary Statistics:\n\n    ===================================== ====== ======\n                                           Min    Max\n    ===================================== ====== ======\n    radius (mean):                        6.981  28.11\n    texture (mean):                       9.71   39.28\n    perimeter (mean):                     43.79  188.5\n    area (mean):                          143.5  2501.0\n    smoothness (mean):                    0.053  0.163\n    compactness (mean):                   0.019  0.345\n    concavity (mean):                     0.0    0.427\n    concave points (mean):                0.0    0.201\n    symmetry (mean):                      0.106  0.304\n    fractal dimension (mean):             0.05   0.097\n    radius (standard error):              0.112  2.873\n    texture (standard error):             0.36   4.885\n    perimeter (standard error):           0.757  21.98\n    area (standard error):                6.802  542.2\n    smoothness (standard error):          0.002  0.031\n    compactness (standard error):         0.002  0.135\n    concavity (standard error):           0.0    0.396\n    concave points (standard error):      0.0    0.053\n    symmetry (standard error):            0.008  0.079\n    fractal dimension (standard error):   0.001  0.03\n    radius (worst):                       7.93   36.04\n    texture (worst):                      12.02  49.54\n    perimeter (worst):                    50.41  251.2\n    area (worst):                         185.2  4254.0\n    smoothness (worst):                   0.071  0.223\n    compactness (worst):                  0.027  1.058\n    concavity (worst):                    0.0    1.252\n    concave points (worst):               0.0    0.291\n    symmetry (worst):                     0.156  0.664\n    fractal dimension (worst):            0.055  0.208\n    ===================================== ====== ======\n\n    :Missing Attribute Values: None\n\n    :Class Distribution: 212 - Malignant, 357 - Benign\n\n    :Creator:  Dr. William H. Wolberg, W. Nick Street, Olvi L. Mangasarian\n\n    :Donor: Nick Street\n\n    :Date: November, 1995\n\nThis is a copy of UCI ML Breast Cancer Wisconsin (Diagnostic) datasets.\nhttps://goo.gl/U2Uwz2\n\nFeatures are computed from a digitized image of a fine needle\naspirate (FNA) of a breast mass.  They describe\ncharacteristics of the cell nuclei present in the image.\n\nSeparating plane described above was obtained using\nMultisurface Method-Tree (MSM-T) [K. P. Bennett, "Decision Tree\nConstruction Via Linear Programming." Proceedings of the 4th\nMidwest Artificial Intelligence and Cognitive Science Society,\npp. 97-101, 1992], a classification method which uses linear\nprogramming to construct a decision tree.  Relevant features\nwere selected using an exhaustive search in the space of 1-4\nfeatures and 1-3 separating planes.\n\nThe actual linear program used to obtain the separating plane\nin the 3-dimensional space is that described in:\n[K. P. Bennett and O. L. Mangasarian: "Robust Linear\nProgramming Discrimination of Two Linearly Inseparable Sets",\nOptimization Methods and Software 1, 1992, 23-34].\n\nThis database is also available through the UW CS ftp server:\n\nftp ftp.cs.wisc.edu\ncd math-prog/cpo-dataset/machine-learn/WDBC/\n\n.. topic:: References\n\n   - W.N. Street, W.H. Wolberg and O.L. Mangasarian. Nuclear feature extraction \n     for breast tumor diagnosis. IS&T/SPIE 1993 International Symposium on \n     Electronic Imaging: Science and Technology, volume 1905, pages 861-870,\n     San Jose, CA, 1993.\n   - O.L. Mangasarian, W.N. Street and W.H. Wolberg. Breast cancer diagnosis and \n     prognosis via linear programming. Operations Research, 43(4), pages 570-577, \n     July-August 1995.\n   - W.H. Wolberg, W.N. Street, and O.L. Mangasarian. Machine learning techniques\n     to diagnose breast cancer from fine-needle aspirates. Cancer Letters 77 (1994) \n     163-171.',
 'feature_names': array(['mean radius', 'mean texture', 'mean perimeter', 'mean area',
        'mean smoothness', 'mean compactness', 'mean concavity',
        'mean concave points', 'mean symmetry', 'mean fractal dimension',
        'radius error', 'texture error', 'perimeter error', 'area error',
        'smoothness error', 'compactness error', 'concavity error',
        'concave points error', 'symmetry error',
        'fractal dimension error', 'worst radius', 'worst texture',
        'worst perimeter', 'worst area', 'worst smoothness',
        'worst compactness', 'worst concavity', 'worst concave points',
        'worst symmetry', 'worst fractal dimension'], dtype='<U23'),
 'filename': 'breast_cancer.csv',
 'data_module': 'sklearn.datasets.data'}
dataset.feature_names
array(['mean radius', 'mean texture', 'mean perimeter', 'mean area',
       'mean smoothness', 'mean compactness', 'mean concavity',
       'mean concave points', 'mean symmetry', 'mean fractal dimension',
       'radius error', 'texture error', 'perimeter error', 'area error',
       'smoothness error', 'compactness error', 'concavity error',
       'concave points error', 'symmetry error',
       'fractal dimension error', 'worst radius', 'worst texture',
       'worst perimeter', 'worst area', 'worst smoothness',
       'worst compactness', 'worst concavity', 'worst concave points',
       'worst symmetry', 'worst fractal dimension'], dtype='<U23')
# feature, target data setting
X_features = dataset.data
y_label = dataset.target

# data load
cancer_df = pd.DataFrame(data=X_features, columns=dataset.feature_names)
cancer_df['target']= y_label

print(cancer_df.shape)
cancer_df.head(5)
(569, 31)
mean radius mean texture mean perimeter mean area mean smoothness mean compactness mean concavity mean concave points mean symmetry mean fractal dimension ... worst texture worst perimeter worst area worst smoothness worst compactness worst concavity worst concave points worst symmetry worst fractal dimension target
0 17.99 10.38 122.80 1001.0 0.11840 0.27760 0.3001 0.14710 0.2419 0.07871 ... 17.33 184.60 2019.0 0.1622 0.6656 0.7119 0.2654 0.4601 0.11890 0
1 20.57 17.77 132.90 1326.0 0.08474 0.07864 0.0869 0.07017 0.1812 0.05667 ... 23.41 158.80 1956.0 0.1238 0.1866 0.2416 0.1860 0.2750 0.08902 0
2 19.69 21.25 130.00 1203.0 0.10960 0.15990 0.1974 0.12790 0.2069 0.05999 ... 25.53 152.50 1709.0 0.1444 0.4245 0.4504 0.2430 0.3613 0.08758 0
3 11.42 20.38 77.58 386.1 0.14250 0.28390 0.2414 0.10520 0.2597 0.09744 ... 26.50 98.87 567.7 0.2098 0.8663 0.6869 0.2575 0.6638 0.17300 0
4 20.29 14.34 135.10 1297.0 0.10030 0.13280 0.1980 0.10430 0.1809 0.05883 ... 16.67 152.20 1575.0 0.1374 0.2050 0.4000 0.1625 0.2364 0.07678 0

5 rows × 31 columns

# target value distribution check
print(dataset.target_names)
print(cancer_df['target'].value_counts())
['malignant' 'benign']
1    357
0    212
Name: target, dtype: int64

-> 우리가 예측해야할 타겟값들이 - 'malignant'(악성:유해한), 'benign'(양성:무해한) -
0, 1로 표시되어 어느정도 고르게 분포되어 있다.

# 전체 데이터 중 80%는 학습용 데이터, 20%는 테스트용 데이터 추출
X_train, X_test, y_train, y_test = train_test_split(X_features, y_label,
                                         test_size=0.2, random_state=156 )
print(X_train.shape , X_test.shape)
(455, 30) (114, 30)

2. 전처리

# Python Wrapper XGBoost - 학습과 예측 데이터 세트를 DMatrix로 변환 필요
dtrain = xgb.DMatrix(data=X_train , label=y_train)
dtest = xgb.DMatrix(data=X_test , label=y_test)

하이퍼 파라미터 설정 

params = { 'max_depth':3,
           'eta': 0.1,
           'objective':'binary:logistic',  # 예측 결정 함수 : 이진 분류
           'eval_metric':'logloss',
           'early_stoppings':100   # 100번동안 성능향상 없으면 학습 조기종료
        }

# 학습 횟수
num_rounds = 400

3. 학습 : train( ) 함수 - early stopping

# 데이터를 학습용은 ‘train’ , 검증용은 ‘eval’로 표시
wlist = [(dtrain,'train'),(dtest,'eval') ]

# 하이퍼 파라미터와 early stopping 파라미터를 train( ) 함수의 파라미터로 전달
xgb_model = xgb.train(params = params, dtrain=dtrain, num_boost_round=num_rounds, evals=wlist)
xgb_model
[11:41:04] WARNING: C:/Users/Administrator/workspace/xgboost-win64_release_1.5.1/src/learner.cc:576: 
Parameters: { "early_stoppings" } might not be used.

  This could be a false alarm, with some parameters getting used by language bindings but
  then being mistakenly passed down to XGBoost core, or some parameter actually being used
  but getting flagged wrongly here. Please open an issue if you find any such cases.

​ 

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<xgboost.core.Booster at 0x21a7de4b730>

4. 예측

predict()를 통해 예측 확률값을 반환하고 예측 값으로 변환

pred_probs = xgb_model.predict(dtest)
print('predict( ) 수행 결과값을 10개만 표시, 예측 확률 값으로 표시됨')
print(np.round(pred_probs[:10], 3))
predict( ) 수행 결과값을 10개만 표시, 예측 확률 값으로 표시됨
[0.95  0.003 0.9   0.086 0.993 1.    1.    0.999 0.998 0.   ]
# 예측 확률이 0.5 보다 크면 1, 그렇지 않으면 0으로 예측값 결정하여 리스트에 저장
preds = [ 1 if x > 0.5 else 0 for x in pred_probs ] # pred_probs 확률값
print('예측값 10개만 표시:', preds[:10])
예측값 10개만 표시: [1, 0, 1, 0, 1, 1, 1, 1, 1, 0]

5. 평가

get_clf_eval( )을 통해 예측 평가

from sklearn.metrics import confusion_matrix, accuracy_score
from sklearn.metrics import precision_score, recall_score
from sklearn.metrics import f1_score, roc_auc_score

# 수정된 get_clf_eval() 함수 
def get_clf_eval(y_test, pred=None, pred_proba=None):
    confusion = confusion_matrix( y_test, pred)
    accuracy = accuracy_score(y_test , pred)
    precision = precision_score(y_test , pred)
    recall = recall_score(y_test , pred)
    f1 = f1_score(y_test,pred)
    # ROC-AUC 추가 
    roc_auc = roc_auc_score(y_test, pred_proba)
    print('오차 행렬')
    print(confusion)
    # ROC-AUC print 추가
    print('정확도: {0:.4f}, 정밀도: {1:.4f}, 재현율: {2:.4f},\
    F1: {3:.4f}, AUC:{4:.4f}'.format(accuracy, precision, recall, f1, roc_auc), '\n')
get_clf_eval(y_test , preds, pred_probs)
오차 행렬
[[35  2]
 [ 1 76]]
정확도: 0.9737, 정밀도: 0.9744, 재현율: 0.9870,    F1: 0.9806, AUC:0.9951

​

Feature Importance 시각화

import matplotlib.pyplot as plt
%matplotlib inline

fig, ax = plt.subplots(figsize=(10, 12))
plot_importance(xgb_model, ax=ax)
<AxesSubplot:title={'center':'Feature importance'}, xlabel='F score', ylabel='Features'>

-> feature가 넘파이의 ndarray이므로, 이름이 feature 순서로 나옴

Case2. 사이킷런 Wrapper XGBoost 개요 및 적용

# Scikit-learn Wrapper XGBoost 클래스인 XGBClassifier 임포트
from xgboost import XGBClassifier
# 원래 검증에 test 데이터를 사용하면 안되지만 여기서는 검증 데이터가 따로 없으므로 쓴다.
evals = [(X_test, y_test)]

# XGBClassifier 클래스의 객체 생성
xgb_wrapper = XGBClassifier(n_estimators=400, learning_rate=0.1, max_depth=3)

학습(검증 포함)

early_stopping_rounds=400

xgb_wrapper.fit(X_train, y_train, early_stopping_rounds=100, eval_set=evals, eval_metric="logloss",  verbose=True)

# 예측
w_preds = xgb_wrapper.predict(X_test)
w_pred_proba = xgb_wrapper.predict_proba(X_test)[:, 1]
[0]	validation_0-logloss:0.61352
[1]	validation_0-logloss:0.54784
[2]	validation_0-logloss:0.49425
[3]	validation_0-logloss:0.44799
[4]	validation_0-logloss:0.40911
[5]	validation_0-logloss:0.37498
[6]	validation_0-logloss:0.34571
[7]	validation_0-logloss:0.32053
[8]	validation_0-logloss:0.29721
[9]	validation_0-logloss:0.27799
[10]	validation_0-logloss:0.26030
[11]	validation_0-logloss:0.24604
[12]	validation_0-logloss:0.23156
[13]	validation_0-logloss:0.22005
[14]	validation_0-logloss:0.20857
[15]	validation_0-logloss:0.19999
[16]	validation_0-logloss:0.19012
[17]	validation_0-logloss:0.18182
[18]	validation_0-logloss:0.17473
[19]	validation_0-logloss:0.16766
[20]	validation_0-logloss:0.15820
[21]	validation_0-logloss:0.15473
[22]	validation_0-logloss:0.14895
[23]	validation_0-logloss:0.14331
[24]	validation_0-logloss:0.13634
[25]	validation_0-logloss:0.13278
[26]	validation_0-logloss:0.12791
[27]	validation_0-logloss:0.12526
[28]	validation_0-logloss:0.11998
[29]	validation_0-logloss:0.11641
[30]	validation_0-logloss:0.11450
[31]	validation_0-logloss:0.11257
[32]	validation_0-logloss:0.11154
[33]	validation_0-logloss:0.10868
[34]	validation_0-logloss:0.10668
[35]	validation_0-logloss:0.10421
[36]	validation_0-logloss:0.10296
[37]	validation_0-logloss:0.10058
[38]	validation_0-logloss:0.09868
[39]	validation_0-logloss:0.09644
[40]	validation_0-logloss:0.09587
[41]	validation_0-logloss:0.09424
[42]	validation_0-logloss:0.09471
[43]	validation_0-logloss:0.09427
[44]	validation_0-logloss:0.09389
[45]	validation_0-logloss:0.09418
[46]	validation_0-logloss:0.09402
[47]	validation_0-logloss:0.09236
[48]	validation_0-logloss:0.09301
[49]	validation_0-logloss:0.09127
[50]	validation_0-logloss:0.09005
[51]	validation_0-logloss:0.08961
[52]	validation_0-logloss:0.08958
[53]	validation_0-logloss:0.09070
[54]	validation_0-logloss:0.08958
[55]	validation_0-logloss:0.09036
[56]	validation_0-logloss:0.09159
[57]	validation_0-logloss:0.09153
[58]	validation_0-logloss:0.09199
[59]	validation_0-logloss:0.09195
[60]	validation_0-logloss:0.09194
[61]	validation_0-logloss:0.09146
[62]	validation_0-logloss:0.09031
[63]	validation_0-logloss:0.08941
[64]	validation_0-logloss:0.08972
[65]	validation_0-logloss:0.08974
[66]	validation_0-logloss:0.08962
[67]	validation_0-logloss:0.08873
[68]	validation_0-logloss:0.08862
[69]	validation_0-logloss:0.08974
[70]	validation_0-logloss:0.08998
[71]	validation_0-logloss:0.08978
[72]	validation_0-logloss:0.08958
[73]	validation_0-logloss:0.08953
[74]	validation_0-logloss:0.08875
[75]	validation_0-logloss:0.08860
[76]	validation_0-logloss:0.08812
[77]	validation_0-logloss:0.08840
[78]	validation_0-logloss:0.08874
[79]	validation_0-logloss:0.08815
[80]	validation_0-logloss:0.08758
[81]	validation_0-logloss:0.08741
[82]	validation_0-logloss:0.08849
[83]	validation_0-logloss:0.08858
[84]	validation_0-logloss:0.08807
[85]	validation_0-logloss:0.08764
[86]	validation_0-logloss:0.08742
[87]	validation_0-logloss:0.08761
[88]	validation_0-logloss:0.08707
[89]	validation_0-logloss:0.08727
[90]	validation_0-logloss:0.08716
[91]	validation_0-logloss:0.08696
[92]	validation_0-logloss:0.08717
[93]	validation_0-logloss:0.08707
[94]	validation_0-logloss:0.08659
[95]	validation_0-logloss:0.08612
[96]	validation_0-logloss:0.08714
[97]	validation_0-logloss:0.08677
[98]	validation_0-logloss:0.08669
[99]	validation_0-logloss:0.08655
[100]	validation_0-logloss:0.08650
[101]	validation_0-logloss:0.08641
[102]	validation_0-logloss:0.08629
[103]	validation_0-logloss:0.08626
[104]	validation_0-logloss:0.08683
[105]	validation_0-logloss:0.08677
[106]	validation_0-logloss:0.08732
[107]	validation_0-logloss:0.08730
[108]	validation_0-logloss:0.08728
[109]	validation_0-logloss:0.08730
[110]	validation_0-logloss:0.08729
[111]	validation_0-logloss:0.08800
[112]	validation_0-logloss:0.08794
[113]	validation_0-logloss:0.08784
[114]	validation_0-logloss:0.08807
[115]	validation_0-logloss:0.08765
[116]	validation_0-logloss:0.08730
[117]	validation_0-logloss:0.08780
[118]	validation_0-logloss:0.08775
[119]	validation_0-logloss:0.08768
[120]	validation_0-logloss:0.08763
[121]	validation_0-logloss:0.08757
[122]	validation_0-logloss:0.08755
[123]	validation_0-logloss:0.08716
[124]	validation_0-logloss:0.08767
[125]	validation_0-logloss:0.08774
[126]	validation_0-logloss:0.08828
[127]	validation_0-logloss:0.08831
[128]	validation_0-logloss:0.08827
[129]	validation_0-logloss:0.08789
[130]	validation_0-logloss:0.08886
[131]	validation_0-logloss:0.08868
[132]	validation_0-logloss:0.08874
[133]	validation_0-logloss:0.08922
[134]	validation_0-logloss:0.08918
[135]	validation_0-logloss:0.08882
[136]	validation_0-logloss:0.08851
[137]	validation_0-logloss:0.08848
[138]	validation_0-logloss:0.08839
[139]	validation_0-logloss:0.08915
[140]	validation_0-logloss:0.08911
[141]	validation_0-logloss:0.08876
[142]	validation_0-logloss:0.08868
[143]	validation_0-logloss:0.08839
[144]	validation_0-logloss:0.08927
[145]	validation_0-logloss:0.08924
[146]	validation_0-logloss:0.08914
[147]	validation_0-logloss:0.08891
[148]	validation_0-logloss:0.08942
[149]	validation_0-logloss:0.08939
[150]	validation_0-logloss:0.08911
[151]	validation_0-logloss:0.08873
[152]	validation_0-logloss:0.08872
[153]	validation_0-logloss:0.08848
[154]	validation_0-logloss:0.08847
[155]	validation_0-logloss:0.08854
[156]	validation_0-logloss:0.08852
[157]	validation_0-logloss:0.08855
[158]	validation_0-logloss:0.08828
[159]	validation_0-logloss:0.08830
[160]	validation_0-logloss:0.08828
[161]	validation_0-logloss:0.08801
[162]	validation_0-logloss:0.08776
[163]	validation_0-logloss:0.08778
[164]	validation_0-logloss:0.08778
[165]	validation_0-logloss:0.08752
[166]	validation_0-logloss:0.08754
[167]	validation_0-logloss:0.08764
[168]	validation_0-logloss:0.08739
[169]	validation_0-logloss:0.08738
[170]	validation_0-logloss:0.08730
[171]	validation_0-logloss:0.08737
[172]	validation_0-logloss:0.08740
[173]	validation_0-logloss:0.08739
[174]	validation_0-logloss:0.08713
[175]	validation_0-logloss:0.08716
[176]	validation_0-logloss:0.08696
[177]	validation_0-logloss:0.08705
[178]	validation_0-logloss:0.08697
[179]	validation_0-logloss:0.08697
[180]	validation_0-logloss:0.08704
[181]	validation_0-logloss:0.08680
[182]	validation_0-logloss:0.08683
[183]	validation_0-logloss:0.08658
[184]	validation_0-logloss:0.08659
[185]	validation_0-logloss:0.08661
[186]	validation_0-logloss:0.08637
[187]	validation_0-logloss:0.08637
[188]	validation_0-logloss:0.08630
[189]	validation_0-logloss:0.08610
[190]	validation_0-logloss:0.08602
[191]	validation_0-logloss:0.08605
[192]	validation_0-logloss:0.08615
[193]	validation_0-logloss:0.08592
[194]	validation_0-logloss:0.08592
[195]	validation_0-logloss:0.08598
[196]	validation_0-logloss:0.08601
[197]	validation_0-logloss:0.08592
[198]	validation_0-logloss:0.08585
[199]	validation_0-logloss:0.08587
[200]	validation_0-logloss:0.08589
[201]	validation_0-logloss:0.08595
[202]	validation_0-logloss:0.08573
[203]	validation_0-logloss:0.08573
[204]	validation_0-logloss:0.08575
[205]	validation_0-logloss:0.08582
[206]	validation_0-logloss:0.08584
[207]	validation_0-logloss:0.08578
[208]	validation_0-logloss:0.08569
[209]	validation_0-logloss:0.08571
[210]	validation_0-logloss:0.08581
[211]	validation_0-logloss:0.08559
[212]	validation_0-logloss:0.08580
[213]	validation_0-logloss:0.08581
[214]	validation_0-logloss:0.08574
[215]	validation_0-logloss:0.08566
[216]	validation_0-logloss:0.08584
[217]	validation_0-logloss:0.08563
[218]	validation_0-logloss:0.08573
[219]	validation_0-logloss:0.08578
[220]	validation_0-logloss:0.08579
[221]	validation_0-logloss:0.08582
[222]	validation_0-logloss:0.08576
[223]	validation_0-logloss:0.08567
[224]	validation_0-logloss:0.08586
[225]	validation_0-logloss:0.08587
[226]	validation_0-logloss:0.08593
[227]	validation_0-logloss:0.08595
[228]	validation_0-logloss:0.08587
[229]	validation_0-logloss:0.08606
[230]	validation_0-logloss:0.08600
[231]	validation_0-logloss:0.08592
[232]	validation_0-logloss:0.08610
[233]	validation_0-logloss:0.08611
[234]	validation_0-logloss:0.08617
[235]	validation_0-logloss:0.08626
[236]	validation_0-logloss:0.08629
[237]	validation_0-logloss:0.08622
[238]	validation_0-logloss:0.08639
[239]	validation_0-logloss:0.08634
[240]	validation_0-logloss:0.08618
[241]	validation_0-logloss:0.08619
[242]	validation_0-logloss:0.08625
[243]	validation_0-logloss:0.08626
[244]	validation_0-logloss:0.08629
[245]	validation_0-logloss:0.08622
[246]	validation_0-logloss:0.08640
[247]	validation_0-logloss:0.08635
[248]	validation_0-logloss:0.08628
[249]	validation_0-logloss:0.08645
[250]	validation_0-logloss:0.08629
[251]	validation_0-logloss:0.08631
[252]	validation_0-logloss:0.08636
[253]	validation_0-logloss:0.08639
[254]	validation_0-logloss:0.08649
[255]	validation_0-logloss:0.08644
[256]	validation_0-logloss:0.08629
[257]	validation_0-logloss:0.08646
[258]	validation_0-logloss:0.08639
[259]	validation_0-logloss:0.08644
[260]	validation_0-logloss:0.08646
[261]	validation_0-logloss:0.08649
[262]	validation_0-logloss:0.08644
[263]	validation_0-logloss:0.08647
[264]	validation_0-logloss:0.08632
[265]	validation_0-logloss:0.08649
[266]	validation_0-logloss:0.08654
[267]	validation_0-logloss:0.08647
[268]	validation_0-logloss:0.08650
[269]	validation_0-logloss:0.08652
[270]	validation_0-logloss:0.08669
[271]	validation_0-logloss:0.08674
[272]	validation_0-logloss:0.08683
[273]	validation_0-logloss:0.08668
[274]	validation_0-logloss:0.08664
[275]	validation_0-logloss:0.08650
[276]	validation_0-logloss:0.08636
[277]	validation_0-logloss:0.08652
[278]	validation_0-logloss:0.08657
[279]	validation_0-logloss:0.08659
[280]	validation_0-logloss:0.08668
[281]	validation_0-logloss:0.08664
[282]	validation_0-logloss:0.08650
[283]	validation_0-logloss:0.08636
[284]	validation_0-logloss:0.08640
[285]	validation_0-logloss:0.08643
[286]	validation_0-logloss:0.08646
[287]	validation_0-logloss:0.08650
[288]	validation_0-logloss:0.08637
[289]	validation_0-logloss:0.08646
[290]	validation_0-logloss:0.08645
[291]	validation_0-logloss:0.08632
[292]	validation_0-logloss:0.08628
[293]	validation_0-logloss:0.08615
[294]	validation_0-logloss:0.08620
[295]	validation_0-logloss:0.08622
[296]	validation_0-logloss:0.08631
[297]	validation_0-logloss:0.08618
[298]	validation_0-logloss:0.08626
[299]	validation_0-logloss:0.08613
[300]	validation_0-logloss:0.08618
[301]	validation_0-logloss:0.08605
[302]	validation_0-logloss:0.08602
[303]	validation_0-logloss:0.08610
[304]	validation_0-logloss:0.08598
[305]	validation_0-logloss:0.08606
[306]	validation_0-logloss:0.08597
[307]	validation_0-logloss:0.08600
[308]	validation_0-logloss:0.08600
[309]	validation_0-logloss:0.08588
[310]	validation_0-logloss:0.08592
# 평가
get_clf_eval(y_test , w_preds, w_pred_proba)
오차 행렬
[[34  3]
 [ 1 76]]
정확도: 0.9649, 정밀도: 0.9620, 재현율: 0.9870,    F1: 0.9744, AUC:0.9954

​

early_stopping_rounds을 100으로 설정하고 재 학습/예측/평가

from xgboost import XGBClassifier

xgb_wrapper = XGBClassifier(n_estimators=400, learning_rate=0.1, max_depth=3)

evals = [(X_test, y_test)]

# early_stopping_rounds=100
xgb_wrapper.fit(X_train, y_train, early_stopping_rounds=50, eval_metric="logloss", 
                eval_set=evals, verbose=True)

ws100_preds = xgb_wrapper.predict(X_test)
ws100_pred_proba = xgb_wrapper.predict_proba(X_test)[:, 1]
[0]	validation_0-logloss:0.61352
[1]	validation_0-logloss:0.54784
[2]	validation_0-logloss:0.49425
[3]	validation_0-logloss:0.44799
[4]	validation_0-logloss:0.40911
[5]	validation_0-logloss:0.37498
[6]	validation_0-logloss:0.34571
[7]	validation_0-logloss:0.32053
[8]	validation_0-logloss:0.29721
[9]	validation_0-logloss:0.27799
[10]	validation_0-logloss:0.26030
[11]	validation_0-logloss:0.24604
[12]	validation_0-logloss:0.23156
[13]	validation_0-logloss:0.22005
[14]	validation_0-logloss:0.20857
[15]	validation_0-logloss:0.19999
[16]	validation_0-logloss:0.19012
[17]	validation_0-logloss:0.18182
[18]	validation_0-logloss:0.17473
[19]	validation_0-logloss:0.16766
[20]	validation_0-logloss:0.15820
[21]	validation_0-logloss:0.15473
[22]	validation_0-logloss:0.14895
[23]	validation_0-logloss:0.14331
[24]	validation_0-logloss:0.13634
[25]	validation_0-logloss:0.13278
[26]	validation_0-logloss:0.12791
[27]	validation_0-logloss:0.12526
[28]	validation_0-logloss:0.11998
[29]	validation_0-logloss:0.11641
[30]	validation_0-logloss:0.11450
[31]	validation_0-logloss:0.11257
[32]	validation_0-logloss:0.11154
[33]	validation_0-logloss:0.10868
[34]	validation_0-logloss:0.10668
[35]	validation_0-logloss:0.10421
[36]	validation_0-logloss:0.10296
[37]	validation_0-logloss:0.10058
[38]	validation_0-logloss:0.09868
[39]	validation_0-logloss:0.09644
[40]	validation_0-logloss:0.09587
[41]	validation_0-logloss:0.09424
[42]	validation_0-logloss:0.09471
[43]	validation_0-logloss:0.09427
[44]	validation_0-logloss:0.09389
[45]	validation_0-logloss:0.09418
[46]	validation_0-logloss:0.09402
[47]	validation_0-logloss:0.09236
[48]	validation_0-logloss:0.09301
[49]	validation_0-logloss:0.09127
[50]	validation_0-logloss:0.09005
[51]	validation_0-logloss:0.08961
[52]	validation_0-logloss:0.08958
[53]	validation_0-logloss:0.09070
[54]	validation_0-logloss:0.08958
[55]	validation_0-logloss:0.09036
[56]	validation_0-logloss:0.09159
[57]	validation_0-logloss:0.09153
[58]	validation_0-logloss:0.09199
[59]	validation_0-logloss:0.09195
[60]	validation_0-logloss:0.09194
[61]	validation_0-logloss:0.09146
[62]	validation_0-logloss:0.09031
[63]	validation_0-logloss:0.08941
[64]	validation_0-logloss:0.08972
[65]	validation_0-logloss:0.08974
[66]	validation_0-logloss:0.08962
[67]	validation_0-logloss:0.08873
[68]	validation_0-logloss:0.08862
[69]	validation_0-logloss:0.08974
[70]	validation_0-logloss:0.08998
[71]	validation_0-logloss:0.08978
[72]	validation_0-logloss:0.08958
[73]	validation_0-logloss:0.08953
[74]	validation_0-logloss:0.08875
[75]	validation_0-logloss:0.08860
[76]	validation_0-logloss:0.08812
[77]	validation_0-logloss:0.08840
[78]	validation_0-logloss:0.08874
[79]	validation_0-logloss:0.08815
[80]	validation_0-logloss:0.08758
[81]	validation_0-logloss:0.08741
[82]	validation_0-logloss:0.08849
[83]	validation_0-logloss:0.08858
[84]	validation_0-logloss:0.08807
[85]	validation_0-logloss:0.08764
[86]	validation_0-logloss:0.08742
[87]	validation_0-logloss:0.08761
[88]	validation_0-logloss:0.08707
[89]	validation_0-logloss:0.08727
[90]	validation_0-logloss:0.08716
[91]	validation_0-logloss:0.08696
[92]	validation_0-logloss:0.08717
[93]	validation_0-logloss:0.08707
[94]	validation_0-logloss:0.08659
[95]	validation_0-logloss:0.08612
[96]	validation_0-logloss:0.08714
[97]	validation_0-logloss:0.08677
[98]	validation_0-logloss:0.08669
[99]	validation_0-logloss:0.08655
[100]	validation_0-logloss:0.08650
[101]	validation_0-logloss:0.08641
[102]	validation_0-logloss:0.08629
[103]	validation_0-logloss:0.08626
[104]	validation_0-logloss:0.08683
[105]	validation_0-logloss:0.08677
[106]	validation_0-logloss:0.08732
[107]	validation_0-logloss:0.08730
[108]	validation_0-logloss:0.08728
[109]	validation_0-logloss:0.08730
[110]	validation_0-logloss:0.08729
[111]	validation_0-logloss:0.08800
[112]	validation_0-logloss:0.08794
[113]	validation_0-logloss:0.08784
[114]	validation_0-logloss:0.08807
[115]	validation_0-logloss:0.08765
[116]	validation_0-logloss:0.08730
[117]	validation_0-logloss:0.08780
[118]	validation_0-logloss:0.08775
[119]	validation_0-logloss:0.08768
[120]	validation_0-logloss:0.08763
[121]	validation_0-logloss:0.08757
[122]	validation_0-logloss:0.08755
[123]	validation_0-logloss:0.08716
[124]	validation_0-logloss:0.08767
[125]	validation_0-logloss:0.08774
[126]	validation_0-logloss:0.08828
[127]	validation_0-logloss:0.08831
[128]	validation_0-logloss:0.08827
[129]	validation_0-logloss:0.08789
[130]	validation_0-logloss:0.08886
[131]	validation_0-logloss:0.08868
[132]	validation_0-logloss:0.08874
[133]	validation_0-logloss:0.08922
[134]	validation_0-logloss:0.08918
[135]	validation_0-logloss:0.08882
[136]	validation_0-logloss:0.08851
[137]	validation_0-logloss:0.08848
[138]	validation_0-logloss:0.08839
[139]	validation_0-logloss:0.08915
[140]	validation_0-logloss:0.08911
[141]	validation_0-logloss:0.08876
[142]	validation_0-logloss:0.08868
[143]	validation_0-logloss:0.08839
[144]	validation_0-logloss:0.08927

-> 211번째 나온 0.0859보다 성능이 좋은 모델이 311번까지 나오지 않아 학습 조기종료

get_clf_eval(y_test , ws100_preds, ws100_pred_proba)
오차 행렬
[[34  3]
 [ 2 75]]
정확도: 0.9561, 정밀도: 0.9615, 재현율: 0.9740,    F1: 0.9677, AUC:0.9947

​

early_stopping_rounds을 10으로 설정하고 재 학습/예측/평가

# early_stopping_rounds를 10으로 설정하고 재 학습. 

# 학습(early_stopping_rounds=10)
xgb_wrapper.fit(X_train, y_train, early_stopping_rounds=10, 
                eval_metric="logloss", eval_set=evals,verbose=True)
# 예측
ws10_preds = xgb_wrapper.predict(X_test)

# 평가
ws10_pred_proba = xgb_wrapper.predict_proba(X_test)[:, 1]
get_clf_eval(y_test , ws10_preds, ws10_pred_proba)
[0]	validation_0-logloss:0.61352
[1]	validation_0-logloss:0.54784
[2]	validation_0-logloss:0.49425
[3]	validation_0-logloss:0.44799
[4]	validation_0-logloss:0.40911
[5]	validation_0-logloss:0.37498
[6]	validation_0-logloss:0.34571
[7]	validation_0-logloss:0.32053
[8]	validation_0-logloss:0.29721
[9]	validation_0-logloss:0.27799
[10]	validation_0-logloss:0.26030
[11]	validation_0-logloss:0.24604
[12]	validation_0-logloss:0.23156
[13]	validation_0-logloss:0.22005
[14]	validation_0-logloss:0.20857
[15]	validation_0-logloss:0.19999
[16]	validation_0-logloss:0.19012
[17]	validation_0-logloss:0.18182
[18]	validation_0-logloss:0.17473
[19]	validation_0-logloss:0.16766
[20]	validation_0-logloss:0.15820
[21]	validation_0-logloss:0.15473
[22]	validation_0-logloss:0.14895
[23]	validation_0-logloss:0.14331
[24]	validation_0-logloss:0.13634
[25]	validation_0-logloss:0.13278
[26]	validation_0-logloss:0.12791
[27]	validation_0-logloss:0.12526
[28]	validation_0-logloss:0.11998
[29]	validation_0-logloss:0.11641
[30]	validation_0-logloss:0.11450
[31]	validation_0-logloss:0.11257
[32]	validation_0-logloss:0.11154
[33]	validation_0-logloss:0.10868
[34]	validation_0-logloss:0.10668
[35]	validation_0-logloss:0.10421
[36]	validation_0-logloss:0.10296
[37]	validation_0-logloss:0.10058
[38]	validation_0-logloss:0.09868
[39]	validation_0-logloss:0.09644
[40]	validation_0-logloss:0.09587
[41]	validation_0-logloss:0.09424
[42]	validation_0-logloss:0.09471
[43]	validation_0-logloss:0.09427
[44]	validation_0-logloss:0.09389
[45]	validation_0-logloss:0.09418
[46]	validation_0-logloss:0.09402
[47]	validation_0-logloss:0.09236
[48]	validation_0-logloss:0.09301
[49]	validation_0-logloss:0.09127
[50]	validation_0-logloss:0.09005
[51]	validation_0-logloss:0.08961
[52]	validation_0-logloss:0.08958
[53]	validation_0-logloss:0.09070
[54]	validation_0-logloss:0.08958
[55]	validation_0-logloss:0.09036
[56]	validation_0-logloss:0.09159
[57]	validation_0-logloss:0.09153
[58]	validation_0-logloss:0.09199
[59]	validation_0-logloss:0.09195
[60]	validation_0-logloss:0.09194
[61]	validation_0-logloss:0.09146
오차 행렬
[[34  3]
 [ 2 75]]
정확도: 0.9561, 정밀도: 0.9615, 재현율: 0.9740,    F1: 0.9677, AUC:0.9947

​
-> early stopping을 10으로 짧게 주면 성능이 떨어지기는 하지만 어느정도 성능은 나온다.
이 정도 학습 속도에서 하이퍼 파라미터 튜닝을 해서 베이스라인을 잡은 다음에
점차 early_stopping_rounds나 n_estimator 수를 늘려나가는 것도 방법.

from xgboost import plot_importance
import matplotlib.pyplot as plt
%matplotlib inline

fig, ax = plt.subplots(figsize=(10, 12))

# feature importance 확인은 사이킷런 래퍼 클래스를 입력해도 무방. 
plot_importance(xgb_wrapper, ax=ax);

profile
Gino
나무를 심는 사람
이전 포스트

사이킷런 - GridSearchCV

다음 포스트

분류(2) - LightGBM

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