随机森林-特征重要性
=============================

:download:`参考JSON<json/rffeature.json>`

## 参数

+------------------------+--------+----------+-------------------------------------------+
| 名称                   | 类型   | 是否必传 | 备注                                      |
+------------------------+--------+----------+-------------------------------------------+
| inputarg               | array  | Y        | 字段集合                                  |
+------------------------+--------+----------+-------------------------------------------+
| inputarg.#.tbname1     | string | Y        | 表名                                      |
+------------------------+--------+----------+-------------------------------------------+
| inputarg.#.labelcol    | string | Y        | 目标特征列                                |
+------------------------+--------+----------+-------------------------------------------+
| inputarg.#.maxdepth    | int    | Y        | 最大树深度                                |
+------------------------+--------+----------+-------------------------------------------+
| inputarg.#.mininfogain | double | Y        | 最小信息收益                              |
+------------------------+--------+----------+-------------------------------------------+
| inputarg.#.impurity    | string | Y        | 计算信息增益的准则，entropy,gini,variance |
+------------------------+--------+----------+-------------------------------------------+
| inputarg.#.numtrees    | int    | Y        | 随机森林树数目                            |
+------------------------+--------+----------+-------------------------------------------+
| inputarg.#.rate        | double | Y        | 设置采样率(0,1]                           |
+------------------------+--------+----------+-------------------------------------------+
| inputarg.#.columnArray | array  | Y        | 字段名称集合                              |
+------------------------+--------+----------+-------------------------------------------+


## 返回

+--------+--------+----------+--------------------------------+
| 名称   | 类型   | 是否必传 | 备注                           |
+--------+--------+----------+--------------------------------+
| result | String | Y        | 所有输出的JSON，按节点类型解析 |
+--------+--------+----------+--------------------------------+

## 算法入口及参数

+---------+------------------------------------------------------------------+--------------------+
| 名称    | 示例                                                             | 备注               |
+---------+------------------------------------------------------------------+--------------------+
| args[0] | tmptb2019062511473300088201                                      | 输入表名           |
+---------+------------------------------------------------------------------+--------------------+
| args[1] | sepal_length,sepal_width,petal_length,petal_width                | 字段集合           |
+---------+------------------------------------------------------------------+--------------------+
| args[2] | result                                                           | 目标列             |
+---------+------------------------------------------------------------------+--------------------+
| args[3] | 6                                                                | 最大树深度         |
+---------+------------------------------------------------------------------+--------------------+
| args[4] | 0.1                                                              | 最小信息增益       |
+---------+------------------------------------------------------------------+--------------------+
| args[5] | gini                                                             | 计算信息增益的准则 |
+---------+------------------------------------------------------------------+--------------------+
| args[6] | 2                                                                | 随机森林树的数量   |
+---------+------------------------------------------------------------------+--------------------+
| args[7] | 1                                                                | 设置采样率         |
+---------+------------------------------------------------------------------+--------------------+
| args[8] | hdfs://namenode:9000/ispatial/sysfile/tmpv2019062605545200088311 | 结果输出地址       |
+---------+------------------------------------------------------------------+--------------------+