FlexibleRunner supports performing validation before training FlexibleRunner 支持训练前进行验证

[OpenMMLab-Assistant-004]

FlexibleRunner supports performing validation before training

FlexibleRunner 支持训练前进行验证

Add a flag "fast_validate_before_train" for FlexibleRunner to enable a fast validation before starting training.

For more information and discussions about this feature, please refer to the following link: [open-mmlab/mmengine#1238](https://github.com/open-mmlab/mmengine/issues/1238](https://github.com/open-mmlab/mmengine/issues/1238))

FlexibleRunner 添加 fast_validate_before_train 参数，用于开启在训练前进行验证。

更多信息参考：[open-mmlab/mmengine#1238](https://github.com/open-mmlab/mmengine/issues/1238](https://github.com/open-mmlab/mmengine/issues/1238))

Task Information

Repository：MMEngine

Difficulty：Medium

Points：30

Estimated Time Consumption：14 days

Task Status

Claimant's Github ID：None

Claim Time：None

PR Link：None

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