How can I resume from a model with only model prameter resumed?

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Checklist

1. I have searched related issues but cannot get the expected help. YES
2. I have read the FAQ documentation but cannot get the expected help. YES

Hi, I have pretrained a model A (e.g. resnet) for 5 epoches and I would like to load the model parameter to model B (e.g. resnet+fpn) and finetune B for 20 epoches. Then, when I load the parameter from model A to B with "resume_from", I find that the training starts with epoch 5 (6th) maybe because the pth file of model A includes the meta info which indicates it is the 5th ckpt. If I would like the downstream model to start training with epoch 0 and does not include the training meta info from A, How can I do ?

Hope to get some suggestions, thanks!