because this change(commit: df31d808) will cause other issues, such as a change in the value of QA monitoring, so revert temporary.

This reverts commit 376d83d4.

This reverts commit 6bed0f57.

This reverts commit 284e2a67.

This reverts commit a38e42f6.

This reverts commit f525cea0.

This reverts commit 6e77bd6c.

This reverts commit 187f38eb.

This reverts commit 32593b63.

This reverts commit d3374e89.

This reverts commit 9beb154b.

This reverts commit c641fb3c.

This reverts commit a41a5bcb.

This reverts commit afc9b4c6.

1. rm Global.eval_mode
2. add Global.task
3. mv type_name to ppcls.utils
4. build dataloader, loss, metric by mode

1. rm engine.device and use paddle.device.get_device() instead;
2. mv some code to build_train_func or build_eval_func to simpfy engine.

https://github.com/PaddlePaddle/PaddleClas/pull/2633