xgboost原理与实战

目录

  xgboost原理

  xgboost和gbdt的区别

  xgboost安装

  实战


 

xgboost原理

  xgboost是一个提升模型,即训练多个分类器,然后将这些分类器串联起来,达到最终的预测效果。每一个基分类器都是一个弱分类器,但是很多串联起来后效果很强大。

  工作原理:

 

  每次加入一棵新树是为了让目标函数进一步下降。当然,加入了新树之后obj可以反映当前损失值;那么这棵新树如何分裂呢?可以使用泰勒公式构造一个Gain来决定当前树模型的划分。

  xgboost支持自定义损失函数

 返回目录

 

xgboost和gbdt的区别 

  • 传统GBDT以CART作为基分类器,xgboost还支持线性分类器,这个时候xgboost相当于带L1和L2正则化项的逻辑斯蒂回归(分类问题)或者线性回归(回归问题)。
  • 传统GBDT在优化时只用到一阶导数信息,xgboost则对代价函数进行了二阶泰勒展开,同时用到了一阶和二阶导数。顺便提一下,xgboost工具支持自定义代价函数,只要函数可一阶和二阶求导。
  • xgboost在代价函数里加入了正则项,用于控制模型的复杂度。正则项里包含了树的叶子节点个数、每个叶子节点上输出的score的L2模的平方和。从Bias-variance tradeoff角度来讲,正则项降低了模型的variance,使学习出来的模型更加简单,防止过拟合,这也是xgboost优于传统GBDT的一个特性。
  • 列抽样column subsampling)。xgboost借鉴了随机森林的做法,支持列抽样,不仅能降低过拟合,还能减少计算,这也是xgboost异于传统gbdt的一个特性。
  • 对缺失值的处理。对于特征的值有缺失的样本,xgboost可以自动学习出它的分裂方向
  • xgboost工具支持并行。boosting不是一种串行的结构吗?怎么并行的?注意xgboost的并行不是tree粒度的并行,xgboost也是一次迭代完才能进行下一次迭代的(第t次迭代的代价函数里包含了前面t-1次迭代的预测值)。xgboost的并行是在特征粒度上的。我们知道,决策树的学习最耗时的一个步骤就是对特征的值进行排序(因为要确定最佳分割点),xgboost在训练之前,预先对数据进行了排序,然后保存为block结构,后面的迭代中重复地使用这个结构,大大减小计算量。这个block结构也使得并行成为了可能,在进行节点的分裂时,需要计算每个特征的增益,最终选增益最大的那个特征去做分裂,那么各个特征的增益计算就可以开多线程进行

 返回目录

 

xgboost安装 

  下载地址:

  https://www.lfd.uci.edu/~gohlke/pythonlibs/#xgboost

 

  执行:

  pip install xxx.whl

 返回目录

 

实战 

 

# -*- coding: utf-8 -*-
import xgboost

# First XGBoost model for Pima Indians dataset
from numpy import loadtxt
from xgboost import XGBClassifier
from sklearn.model_selection import train_test_split
from sklearn.metrics import accuracy_score
# load data
dataset = loadtxt('pima-indians-diabetes.csv', delimiter=",")
# split data into X and y
X = dataset[:,0:8]
Y = dataset[:,8]
# split data into train and test sets
seed = 7
test_size = 0.33
X_train, X_test, y_train, y_test = train_test_split(X, Y, test_size=test_size, random_state=seed)
# fit model no training data
model = XGBClassifier()
model.fit(X_train, y_train)
# make predictions for test data
y_pred = model.predict(X_test)
predictions = [round(value) for value in y_pred]
# evaluate predictions
accuracy = accuracy_score(y_test, predictions)
print("Accuracy: %.2f%%" % (accuracy * 100.0))

 

 

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0    146    70    0    0    37.9    0.334    28    1
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12    88    74    40    54    35.3    0.378    48    0
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8    105    100    36    0    43.3    0.239    45    1
5    144    82    26    285    32    0.452    58    1
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1    97    68    21    0    27.2    1.095    22    0
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1    97    64    19    82    18.2    0.299    21    0
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0    57    60    0    0    21.7    0.735    67    0
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8    100    74    40    215    39.4    0.661    43    1
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1    87    68    34    77    37.6    0.401    24    0
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3    78    70    0    0    32.5    0.27    39    0
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2    157    74    35    440    39.4    0.134    30    0
1    167    74    17    144    23.4    0.447    33    1
0    179    50    36    159    37.8    0.455    22    1
11    136    84    35    130    28.3    0.26    42    1
0    107    60    25    0    26.4    0.133    23    0
1    91    54    25    100    25.2    0.234    23    0
1    117    60    23    106    33.8    0.466    27    0
5    123    74    40    77    34.1    0.269    28    0
2    120    54    0    0    26.8    0.455    27    0
1    106    70    28    135    34.2    0.142    22    0
2    155    52    27    540    38.7    0.24    25    1
2    101    58    35    90    21.8    0.155    22    0
1    120    80    48    200    38.9    1.162    41    0
11    127    106    0    0    39    0.19    51    0
3    80    82    31    70    34.2    1.292    27    1
10    162    84    0    0    27.7    0.182    54    0
1    199    76    43    0    42.9    1.394    22    1
8    167    106    46    231    37.6    0.165    43    1
9    145    80    46    130    37.9    0.637    40    1
6    115    60    39    0    33.7    0.245    40    1
1    112    80    45    132    34.8    0.217    24    0
4    145    82    18    0    32.5    0.235    70    1
10    111    70    27    0    27.5    0.141    40    1
6    98    58    33    190    34    0.43    43    0
9    154    78    30    100    30.9    0.164    45    0
6    165    68    26    168    33.6    0.631    49    0
1    99    58    10    0    25.4    0.551    21    0
10    68    106    23    49    35.5    0.285    47    0
3    123    100    35    240    57.3    0.88    22    0
8    91    82    0    0    35.6    0.587    68    0
6    195    70    0    0    30.9    0.328    31    1
9    156    86    0    0    24.8    0.23    53    1
0    93    60    0    0    35.3    0.263    25    0
3    121    52    0    0    36    0.127    25    1
2    101    58    17    265    24.2    0.614    23    0
2    56    56    28    45    24.2    0.332    22    0
0    162    76    36    0    49.6    0.364    26    1
0    95    64    39    105    44.6    0.366    22    0
4    125    80    0    0    32.3    0.536    27    1
5    136    82    0    0    0    0.64    69    0
2    129    74    26    205    33.2    0.591    25    0
3    130    64    0    0    23.1    0.314    22    0
1    107    50    19    0    28.3    0.181    29    0
1    140    74    26    180    24.1    0.828    23    0
1    144    82    46    180    46.1    0.335    46    1
8    107    80    0    0    24.6    0.856    34    0
13    158    114    0    0    42.3    0.257    44    1
2    121    70    32    95    39.1    0.886    23    0
7    129    68    49    125    38.5    0.439    43    1
2    90    60    0    0    23.5    0.191    25    0
7    142    90    24    480    30.4    0.128    43    1
3    169    74    19    125    29.9    0.268    31    1
0    99    0    0    0    25    0.253    22    0
4    127    88    11    155    34.5    0.598    28    0
4    118    70    0    0    44.5    0.904    26    0
2    122    76    27    200    35.9    0.483    26    0
6    125    78    31    0    27.6    0.565    49    1
1    168    88    29    0    35    0.905    52    1
2    129    0    0    0    38.5    0.304    41    0
4    110    76    20    100    28.4    0.118    27    0
6    80    80    36    0    39.8    0.177    28    0
10    115    0    0    0    0    0.261    30    1
2    127    46    21    335    34.4    0.176    22    0
9    164    78    0    0    32.8    0.148    45    1
2    93    64    32    160    38    0.674    23    1
3    158    64    13    387    31.2    0.295    24    0
5    126    78    27    22    29.6    0.439    40    0
10    129    62    36    0    41.2    0.441    38    1
0    134    58    20    291    26.4    0.352    21    0
3    102    74    0    0    29.5    0.121    32    0
7    187    50    33    392    33.9    0.826    34    1
3    173    78    39    185    33.8    0.97    31    1
10    94    72    18    0    23.1    0.595    56    0
1    108    60    46    178    35.5    0.415    24    0
5    97    76    27    0    35.6    0.378    52    1
4    83    86    19    0    29.3    0.317    34    0
1    114    66    36    200    38.1    0.289    21    0
1    149    68    29    127    29.3    0.349    42    1
5    117    86    30    105    39.1    0.251    42    0
1    111    94    0    0    32.8    0.265    45    0
4    112    78    40    0    39.4    0.236    38    0
1    116    78    29    180    36.1    0.496    25    0
0    141    84    26    0    32.4    0.433    22    0
2    175    88    0    0    22.9    0.326    22    0
2    92    52    0    0    30.1    0.141    22    0
3    130    78    23    79    28.4    0.323    34    1
8    120    86    0    0    28.4    0.259    22    1
2    174    88    37    120    44.5    0.646    24    1
2    106    56    27    165    29    0.426    22    0
2    105    75    0    0    23.3    0.56    53    0
4    95    60    32    0    35.4    0.284    28    0
0    126    86    27    120    27.4    0.515    21    0
8    65    72    23    0    32    0.6    42    0
2    99    60    17    160    36.6    0.453    21    0
1    102    74    0    0    39.5    0.293    42    1
11    120    80    37    150    42.3    0.785    48    1
3    102    44    20    94    30.8    0.4    26    0
1    109    58    18    116    28.5    0.219    22    0
9    140    94    0    0    32.7    0.734    45    1
13    153    88    37    140    40.6    1.174    39    0
12    100    84    33    105    30    0.488    46    0
1    147    94    41    0    49.3    0.358    27    1
1    81    74    41    57    46.3    1.096    32    0
3    187    70    22    200    36.4    0.408    36    1
6    162    62    0    0    24.3    0.178    50    1
4    136    70    0    0    31.2    1.182    22    1
1    121    78    39    74    39    0.261    28    0
3    108    62    24    0    26    0.223    25    0
0    181    88    44    510    43.3    0.222    26    1
8    154    78    32    0    32.4    0.443    45    1
1    128    88    39    110    36.5    1.057    37    1
7    137    90    41    0    32    0.391    39    0
0    123    72    0    0    36.3    0.258    52    1
1    106    76    0    0    37.5    0.197    26    0
6    190    92    0    0    35.5    0.278    66    1
2    88    58    26    16    28.4    0.766    22    0
9    170    74    31    0    44    0.403    43    1
9    89    62    0    0    22.5    0.142    33    0
10    101    76    48    180    32.9    0.171    63    0
2    122    70    27    0    36.8    0.34    27    0
5    121    72    23    112    26.2    0.245    30    0
1    126    60    0    0    30.1    0.349    47    1
1    93    70    31    0    30.4    0.315    23    0

 

 

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posted @ 2018-01-27 19:14  黎明程序员  阅读(1177)  评论(0编辑  收藏  举报