Bug fixes and Improvements
- Now all resnet definitions in GluonCV support Synchronized BatchNorm
- Now pretrained object detection models support `reset_class` for reuse partial category knowledge so some task may not need to finetune models anymore: https://gluon-cv.mxnet.io/build/examples_detection/skip_fintune.html#sphx-glr-build-examples-detection-skip-fintune-py
- Fix some dataloader issue(need mxnet >= 1.4.0)
- Fix some segmentation models that won't hybridize
- Fix some detection model random Nan problems (require mxnet latest nightly build, >= 20190315)
- Various other minor bug fixes