maven下载加速

在home目录下，修改setting.py脚本如下：

<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0
                          https://maven.apache.org/xsd/settings-1.0.0.xsd">
      <mirrors>
        <mirror>
            <id>alimaven</id>
            <name>aliyun maven</name>
            <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
            <mirrorOf>central</mirrorOf>
        </mirror>
      </mirrors>
</settings>

xgboost

实用，全面 https://homes.cs.washington.edu/~tqchen/pdf/BoostedTree.pdf


dataframe 实现 http://www.cnblogs.com/zhaochunhua/p/6723660.html

解决出现的问题： https://github.com/dmlc/xgboost/issues/2480