RuntimeError in ParamScheduler

Encountered an runtime error when running with latest version of detectron2 and fvcore. Happens exactly when training the object detection model with scheduler.step() in code.

File "/../lib/computer-vision/pfr-vision/env/pytorch_gpu/lib/python3.8/site-packages/fvcore/common/param_scheduler.py", line 236, in `__call__`
`raise RuntimeError(
RuntimeError: where in ParamScheduler must be in [0, 1]: got 1.1666666666666667`

**library with version**
* torch 1.9.0+cu111
* torchaudio 0.9.0
* torchvision 0.10.0+cu111
* detectron2 0.5+cu111
* fvcore 0.1.5