Support log scale for the return curve. #886
Open
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添加了对数轴收益率曲线的支持。
效果图:
![log_linear_compare_1](https://private-user-images.githubusercontent.com/34575150/335809451-a5c2bf4e-6b92-4901-ae00-43110bcbad1d.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.qtU4wplLByoyt4bhI9t5DEUFjcrhGHNCcKqxYaA1YsE)
默认坐标回测后期的净值比较大,初期涨跌就不易观察;对数坐标使得观察更容易
Fixes #870