About resume training after epoch 17

[MsterDC]

When I resume training from epoch 17, then I got a

ValueError: loaded state dict contains a parameter group that doesn't match the size of optimizer's group

Then I reviewed the code and modified the "train.py" in line 293:

optimizer, lr_scheduler = build_opt_lr(model, cfg.TRAIN.START_EPOCH) to
optimizer, lr_scheduler = build_opt_lr(model, 17)

And I can continue to training. But I want to know if this is correct？

[MsterDC]

Besides, the training task is siamrpn_resnet50, before epoch10, use pretrained backbone without parameter update, layer 2,3,4 will be updated after epoch10

[ZhiyuanChen]

Possibily duplicates with #80