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Merge pull request #1680 from vnpy/docs

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docs/cta_backtester.md
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@ -247,7 +247,7 @@ vnpy提供2种参数优化的解决方案：穷举算法、遗传算法
- 输入需要优化的参数名、优化区间、优化步进，以及优化目标；
- 形成全局参数组合，该组合的数据结构是列表内镶嵌元组，即[[(key, value), (key, value)] , [(key, value), (key,value)]]，与穷举算法的全局参数组合的数据结构不同。这样做的目的是有利于参数间进行交叉互换和变异。
- 形成全局参数组合，该组合的数据结构是列表内镶嵌元组，即\[[(key, value), (key, value)] , [(key, value), (key,value)]]，与穷举算法的全局参数组合的数据结构不同。这样做的目的是有利于参数间进行交叉互换和变异。
```
def generate_setting_ga(self):
""""""

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docs/index.md
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@ -81,5 +81,9 @@
* [交易接口](gateway.md)
* [RPC应用](rpc.md)
* [贡献代码](contribution.md)
* [配置数据库](database.md)
* [SQLite](database.md#SQLite)
* [SQL(MySQL,PostgreSQL)](database.md#SQL(MySQL,PostgreSQL))
* [MongoDB](database.md#MongoDB)
* [贡献代码](contribution.md)