ccyousa

关于文档改进和callback兼容性

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**Describe the bug** A clear and concise description of what the bug is. 1. DistTrainer 和 Trainer 不仅是分布式与独立训练的差异，对各种原生callback的支持存在显著不同。 建议增加文档说明各原生callback对两个trainer的支持情况，毕竟有些callback要在若干个epoch运行以后才会触发bug； 2. （Dist）trainer，指定save path后保存模型，不能指定仅保存参数，而保存完整模型容易触发pickling error； **To Reproduce** Steps to reproduce the behavior:...

dist_trainer缺少成员变量batch_per_epoch，导致callback lr_finder.lr_gen（line 766）函数报错

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如题。

there is not a default value for "created" of the object "task" when using func ".where(t => t.created > recentDate)" to filter recent tasks.

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### What happened? there used to be a default value for "task.created" (by the page.cday), but now there isn't such a default value and i don't know how to fix...