lr scheduler `MultiStepLR` doesn't follow PyTorch's LRScheduler API.

[ChirsHuanhuan]

when training I meet the error: pytorch_lightning.utilities.exceptions.MisconfigurationException: The provided lr scheduler MultiStepLR doesn't follow PyTorch's LRScheduler API. You should override the LightningModule.lr_scheduler_step hook with your own logic if you are using a custom LR scheduler. Are there anyone who has met the problem too? How to solve it?