xgboost原理与实战

时间:2022-12-22 05:27:31

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:

xgboost原理与实战

xgboost原理与实战

  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原理与实战

  xgboost支持自定义损失函数

xgboost原理与实战

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))
6    148    72    35    0    33.6    0.627    50    1
1 85 66 29 0 26.6 0.351 31 0
8 183 64 0 0 23.3 0.672 32 1
1 89 66 23 94 28.1 0.167 21 0
0 137 40 35 168 43.1 2.288 33 1
5 116 74 0 0 25.6 0.201 30 0
3 78 50 32 88 31 0.248 26 1
10 115 0 0 0 35.3 0.134 29 0
2 197 70 45 543 30.5 0.158 53 1
8 125 96 0 0 0 0.232 54 1
4 110 92 0 0 37.6 0.191 30 0
10 168 74 0 0 38 0.537 34 1
10 139 80 0 0 27.1 1.441 57 0
1 189 60 23 846 30.1 0.398 59 1
5 166 72 19 175 25.8 0.587 51 1
7 100 0 0 0 30 0.484 32 1
0 118 84 47 230 45.8 0.551 31 1
7 107 74 0 0 29.6 0.254 31 1
1 103 30 38 83 43.3 0.183 33 0
1 115 70 30 96 34.6 0.529 32 1
3 126 88 41 235 39.3 0.704 27 0
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7 196 90 0 0 39.8 0.451 41 1
9 119 80 35 0 29 0.263 29 1
11 143 94 33 146 36.6 0.254 51 1
10 125 70 26 115 31.1 0.205 41 1
7 147 76 0 0 39.4 0.257 43 1
1 97 66 15 140 23.2 0.487 22 0
13 145 82 19 110 22.2 0.245 57 0
5 117 92 0 0 34.1 0.337 38 0
5 109 75 26 0 36 0.546 60 0
3 158 76 36 245 31.6 0.851 28 1
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6 92 92 0 0 19.9 0.188 28 0
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4 103 60 33 192 24 0.966 33 0
11 138 76 0 0 33.2 0.42 35 0
9 102 76 37 0 32.9 0.665 46 1
2 90 68 42 0 38.2 0.503 27 1
4 111 72 47 207 37.1 1.39 56 1
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7 133 84 0 0 40.2 0.696 37 0
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0 180 66 39 0 42 1.893 25 1
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7 105 0 0 0 0 0.305 24 0
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1 73 50 10 0 23 0.248 21 0
7 187 68 39 304 37.7 0.254 41 1
0 100 88 60 110 46.8 0.962 31 0
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2 84 0 0 0 0 0.304 21 0
8 133 72 0 0 32.9 0.27 39 1
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7 114 66 0 0 32.8 0.258 42 1
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1 95 66 13 38 19.6 0.334 25 0
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2 100 66 20 90 32.9 0.867 28 1
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1 0 48 20 0 24.7 0.14 22 0
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5 95 72 33 0 37.7 0.37 27 0
0 131 0 0 0 43.2 0.27 26 1
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2 74 0 0 0 0 0.102 22 0
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0 101 65 28 0 24.6 0.237 22 0
5 137 108 0 0 48.8 0.227 37 1
2 110 74 29 125 32.4 0.698 27 0
13 106 72 54 0 36.6 0.178 45 0
2 100 68 25 71 38.5 0.324 26 0
15 136 70 32 110 37.1 0.153 43 1
1 107 68 19 0 26.5 0.165 24 0
1 80 55 0 0 19.1 0.258 21 0
4 123 80 15 176 32 0.443 34 0
7 81 78 40 48 46.7 0.261 42 0
4 134 72 0 0 23.8 0.277 60 1
2 142 82 18 64 24.7 0.761 21 0
6 144 72 27 228 33.9 0.255 40 0
2 92 62 28 0 31.6 0.13 24 0
1 71 48 18 76 20.4 0.323 22 0
6 93 50 30 64 28.7 0.356 23 0
1 122 90 51 220 49.7 0.325 31 1
1 163 72 0 0 39 1.222 33 1
1 151 60 0 0 26.1 0.179 22 0
0 125 96 0 0 22.5 0.262 21 0
1 81 72 18 40 26.6 0.283 24 0
2 85 65 0 0 39.6 0.93 27 0
1 126 56 29 152 28.7 0.801 21 0
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3 83 58 31 18 34.3 0.336 25 0
0 95 85 25 36 37.4 0.247 24 1
3 171 72 33 135 33.3 0.199 24 1
8 155 62 26 495 34 0.543 46 1
1 89 76 34 37 31.2 0.192 23 0
4 76 62 0 0 34 0.391 25 0
7 160 54 32 175 30.5 0.588 39 1
4 146 92 0 0 31.2 0.539 61 1
5 124 74 0 0 34 0.22 38 1
5 78 48 0 0 33.7 0.654 25 0
4 97 60 23 0 28.2 0.443 22 0
4 99 76 15 51 23.2 0.223 21 0
0 162 76 56 100 53.2 0.759 25 1
6 111 64 39 0 34.2 0.26 24 0
2 107 74 30 100 33.6 0.404 23 0
5 132 80 0 0 26.8 0.186 69 0
0 113 76 0 0 33.3 0.278 23 1
1 88 30 42 99 55 0.496 26 1
3 120 70 30 135 42.9 0.452 30 0
1 118 58 36 94 33.3 0.261 23 0
1 117 88 24 145 34.5 0.403 40 1
0 105 84 0 0 27.9 0.741 62 1
4 173 70 14 168 29.7 0.361 33 1
9 122 56 0 0 33.3 1.114 33 1
3 170 64 37 225 34.5 0.356 30 1
8 84 74 31 0 38.3 0.457 39 0
2 96 68 13 49 21.1 0.647 26 0
2 125 60 20 140 33.8 0.088 31 0
0 100 70 26 50 30.8 0.597 21 0
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0 129 80 0 0 31.2 0.703 29 0
5 105 72 29 325 36.9 0.159 28 0
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5 106 82 30 0 39.5 0.286 38 0
2 108 52 26 63 32.5 0.318 22 0
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4 154 62 31 284 32.8 0.237 23 0
0 102 75 23 0 0 0.572 21 0
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2 106 64 35 119 30.5 1.4 34 0
5 147 78 0 0 33.7 0.218 65 0
2 90 70 17 0 27.3 0.085 22 0
1 136 74 50 204 37.4 0.399 24 0
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9 156 86 28 155 34.3 1.189 42 1
1 153 82 42 485 40.6 0.687 23 0
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7 152 88 44 0 50 0.337 36 1
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17 163 72 41 114 40.9 0.817 47 1
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0 131 88 0 0 31.6 0.743 32 1
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6 134 70 23 130 35.4 0.542 29 1
2 87 0 23 0 28.9 0.773 25 0
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8 179 72 42 130 32.7 0.719 36 1
6 85 78 0 0 31.2 0.382 42 0
0 129 110 46 130 67.1 0.319 26 1
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5 130 82 0 0 39.1 0.956 37 1
6 87 80 0 0 23.2 0.084 32 0
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1 0 74 20 23 27.7 0.299 21 0
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7 194 68 28 0 35.9 0.745 41 1
8 181 68 36 495 30.1 0.615 60 1
1 128 98 41 58 32 1.321 33 1
8 109 76 39 114 27.9 0.64 31 1
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3 111 62 0 0 22.6 0.142 21 0
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1 105 58 0 0 24.3 0.187 21 0
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0 113 80 16 0 31 0.874 21 0
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2 99 70 16 44 20.4 0.235 27 0
6 103 72 32 190 37.7 0.324 55 0
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1 96 64 27 87 33.2 0.289 21 0
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9 112 82 32 175 34.2 0.26 36 1
12 151 70 40 271 41.8 0.742 38 1
5 109 62 41 129 35.8 0.514 25 1
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5 85 74 22 0 29 1.224 32 1
5 112 66 0 0 37.8 0.261 41 1
0 177 60 29 478 34.6 1.072 21 1
2 158 90 0 0 31.6 0.805 66 1
7 119 0 0 0 25.2 0.209 37 0
7 142 60 33 190 28.8 0.687 61 0
1 100 66 15 56 23.6 0.666 26 0
1 87 78 27 32 34.6 0.101 22 0
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6 134 80 37 370 46.2 0.238 46 1
1 79 80 25 37 25.4 0.583 22 0
4 122 68 0 0 35 0.394 29 0
3 74 68 28 45 29.7 0.293 23 0
4 171 72 0 0 43.6 0.479 26 1
7 181 84 21 192 35.9 0.586 51 1
0 179 90 27 0 44.1 0.686 23 1
9 164 84 21 0 30.8 0.831 32 1
0 104 76 0 0 18.4 0.582 27 0
1 91 64 24 0 29.2 0.192 21 0
4 91 70 32 88 33.1 0.446 22 0
3 139 54 0 0 25.6 0.402 22 1
6 119 50 22 176 27.1 1.318 33 1
2 146 76 35 194 38.2 0.329 29 0
9 184 85 15 0 30 1.213 49 1
10 122 68 0 0 31.2 0.258 41 0
0 165 90 33 680 52.3 0.427 23 0
9 124 70 33 402 35.4 0.282 34 0
1 111 86 19 0 30.1 0.143 23 0
9 106 52 0 0 31.2 0.38 42 0
2 129 84 0 0 28 0.284 27 0
2 90 80 14 55 24.4 0.249 24 0
0 86 68 32 0 35.8 0.238 25 0
12 92 62 7 258 27.6 0.926 44 1
1 113 64 35 0 33.6 0.543 21 1
3 111 56 39 0 30.1 0.557 30 0
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1 193 50 16 375 25.9 0.655 24 0
11 155 76 28 150 33.3 1.353 51 1
3 191 68 15 130 30.9 0.299 34 0
3 141 0 0 0 30 0.761 27 1
4 95 70 32 0 32.1 0.612 24 0
3 142 80 15 0 32.4 0.2 63 0
4 123 62 0 0 32 0.226 35 1
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0 138 0 0 0 36.3 0.933 25 1
2 128 64 42 0 40 1.101 24 0
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10 101 86 37 0 45.6 1.136 38 1
2 108 62 32 56 25.2 0.128 21 0
3 122 78 0 0 23 0.254 40 0
1 71 78 50 45 33.2 0.422 21 0
13 106 70 0 0 34.2 0.251 52 0
2 100 70 52 57 40.5 0.677 25 0
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2 108 62 10 278 25.3 0.881 22 0
0 146 70 0 0 37.9 0.334 28 1
10 129 76 28 122 35.9 0.28 39 0
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7 161 86 0 0 30.4 0.165 47 1
2 108 80 0 0 27 0.259 52 1
7 136 74 26 135 26 0.647 51 0
5 155 84 44 545 38.7 0.619 34 0
1 119 86 39 220 45.6 0.808 29 1
4 96 56 17 49 20.8 0.34 26 0
5 108 72 43 75 36.1 0.263 33 0
0 78 88 29 40 36.9 0.434 21 0
0 107 62 30 74 36.6 0.757 25 1
2 128 78 37 182 43.3 1.224 31 1
1 128 48 45 194 40.5 0.613 24 1
0 161 50 0 0 21.9 0.254 65 0
6 151 62 31 120 35.5 0.692 28 0
2 146 70 38 360 28 0.337 29 1
0 126 84 29 215 30.7 0.52 24 0
14 100 78 25 184 36.6 0.412 46 1
8 112 72 0 0 23.6 0.84 58 0
0 167 0 0 0 32.3 0.839 30 1
2 144 58 33 135 31.6 0.422 25 1
5 77 82 41 42 35.8 0.156 35 0
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10 161 68 23 132 25.5 0.326 47 1
0 137 68 14 148 24.8 0.143 21 0
0 128 68 19 180 30.5 1.391 25 1
2 124 68 28 205 32.9 0.875 30 1
6 80 66 30 0 26.2 0.313 41 0
0 106 70 37 148 39.4 0.605 22 0
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2 112 68 22 94 34.1 0.315 26 0
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3 182 74 0 0 30.5 0.345 29 1
3 115 66 39 140 38.1 0.15 28 0
6 194 78 0 0 23.5 0.129 59 1
4 129 60 12 231 27.5 0.527 31 0
3 112 74 30 0 31.6 0.197 25 1
0 124 70 20 0 27.4 0.254 36 1
13 152 90 33 29 26.8 0.731 43 1
2 112 75 32 0 35.7 0.148 21 0
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1 122 64 32 156 35.1 0.692 30 1
10 179 70 0 0 35.1 0.2 37 0
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6 105 70 32 68 30.8 0.122 37 0
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1 0 68 35 0 32 0.389 22 0
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3 116 0 0 0 23.5 0.187 23 0
3 99 62 19 74 21.8 0.279 26 0
5 0 80 32 0 41 0.346 37 1
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3 90 78 0 0 42.7 0.559 21 0
9 165 88 0 0 30.4 0.302 49 1
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13 129 0 30 0 39.9 0.569 44 1
12 88 74 40 54 35.3 0.378 48 0
1 196 76 36 249 36.5 0.875 29 1
5 189 64 33 325 31.2 0.583 29 1
5 158 70 0 0 29.8 0.207 63 0
5 103 108 37 0 39.2 0.305 65 0
4 146 78 0 0 38.5 0.52 67 1
4 147 74 25 293 34.9 0.385 30 0
5 99 54 28 83 34 0.499 30 0
6 124 72 0 0 27.6 0.368 29 1
0 101 64 17 0 21 0.252 21 0
3 81 86 16 66 27.5 0.306 22 0
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3 173 82 48 465 38.4 2.137 25 1
0 118 64 23 89 0 1.731 21 0
0 84 64 22 66 35.8 0.545 21 0
2 105 58 40 94 34.9 0.225 25 0
2 122 52 43 158 36.2 0.816 28 0
12 140 82 43 325 39.2 0.528 58 1
0 98 82 15 84 25.2 0.299 22 0
1 87 60 37 75 37.2 0.509 22 0
4 156 75 0 0 48.3 0.238 32 1
0 93 100 39 72 43.4 1.021 35 0
1 107 72 30 82 30.8 0.821 24 0
0 105 68 22 0 20 0.236 22 0
1 109 60 8 182 25.4 0.947 21 0
1 90 62 18 59 25.1 1.268 25 0
1 125 70 24 110 24.3 0.221 25 0
1 119 54 13 50 22.3 0.205 24 0
5 116 74 29 0 32.3 0.66 35 1
8 105 100 36 0 43.3 0.239 45 1
5 144 82 26 285 32 0.452 58 1
3 100 68 23 81 31.6 0.949 28 0
1 100 66 29 196 32 0.444 42 0
5 166 76 0 0 45.7 0.34 27 1
1 131 64 14 415 23.7 0.389 21 0
4 116 72 12 87 22.1 0.463 37 0
4 158 78 0 0 32.9 0.803 31 1
2 127 58 24 275 27.7 1.6 25 0
3 96 56 34 115 24.7 0.944 39 0
0 131 66 40 0 34.3 0.196 22 1
3 82 70 0 0 21.1 0.389 25 0
3 193 70 31 0 34.9 0.241 25 1
4 95 64 0 0 32 0.161 31 1
6 137 61 0 0 24.2 0.151 55 0
5 136 84 41 88 35 0.286 35 1
9 72 78 25 0 31.6 0.28 38 0
5 168 64 0 0 32.9 0.135 41 1
2 123 48 32 165 42.1 0.52 26 0
4 115 72 0 0 28.9 0.376 46 1
0 101 62 0 0 21.9 0.336 25 0
8 197 74 0 0 25.9 1.191 39 1
1 172 68 49 579 42.4 0.702 28 1
6 102 90 39 0 35.7 0.674 28 0
1 112 72 30 176 34.4 0.528 25 0
1 143 84 23 310 42.4 1.076 22 0
1 143 74 22 61 26.2 0.256 21 0
0 138 60 35 167 34.6 0.534 21 1
3 173 84 33 474 35.7 0.258 22 1
1 97 68 21 0 27.2 1.095 22 0
4 144 82 32 0 38.5 0.554 37 1
1 83 68 0 0 18.2 0.624 27 0
3 129 64 29 115 26.4 0.219 28 1
1 119 88 41 170 45.3 0.507 26 0
2 94 68 18 76 26 0.561 21 0
0 102 64 46 78 40.6 0.496 21 0
2 115 64 22 0 30.8 0.421 21 0
8 151 78 32 210 42.9 0.516 36 1
4 184 78 39 277 37 0.264 31 1
0 94 0 0 0 0 0.256 25 0
1 181 64 30 180 34.1 0.328 38 1
0 135 94 46 145 40.6 0.284 26 0
1 95 82 25 180 35 0.233 43 1
2 99 0 0 0 22.2 0.108 23 0
3 89 74 16 85 30.4 0.551 38 0
1 80 74 11 60 30 0.527 22 0
2 139 75 0 0 25.6 0.167 29 0
1 90 68 8 0 24.5 1.138 36 0
0 141 0 0 0 42.4 0.205 29 1
12 140 85 33 0 37.4 0.244 41 0
5 147 75 0 0 29.9 0.434 28 0
1 97 70 15 0 18.2 0.147 21 0
6 107 88 0 0 36.8 0.727 31 0
0 189 104 25 0 34.3 0.435 41 1
2 83 66 23 50 32.2 0.497 22 0
4 117 64 27 120 33.2 0.23 24 0
8 108 70 0 0 30.5 0.955 33 1
4 117 62 12 0 29.7 0.38 30 1
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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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