imwangyt

VertBinSubstitution.substitution()返回值

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### 文档修改建议 【woe分箱】章节，以下代码中，`substitution`的返回值是Tuple： ```python vdf = woe_sub.substitution(vdf, bin_rules) ``` 应改为： ```python vdf, _ = woe_sub.substitution(vdf, bin_rules) ``` 源码：https://github.com/secretflow/secretflow/blob/e3050b292421405c2ef6c190919974b3cfd82e06/secretflow/preprocessing/binning/vert_bin_substitution.py#L129 ps：方法声明也不对。 技术信息 页面 https://www.secretflow.org.cn/zh-CN/docs/secretflow/v1.4.0b0/tutorial/risk_control_scenario 源码 https://github.com/secretflow/secretflow/blob/dd349d318f128f1bf6cf31a413ec75110ba333ed/docs/tutorial/risk_control_scenario.ipynb 浏览器 Mozilla/5.0 (Windows NT 10.0; Win64;...

can provide `help` statement in the scdbclient prompt?

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like the [MySQL HELP statement](https://dev.mysql.com/doc/refman/8.0/en/help.html). I guess it's helpful for newcomers. Thank you~