How to train from searching stage?

Hi, How can we resume training in the converging stage?

I know there are 200 epochs in the searching stage and 300 epochs in the converging stage by default.  
Suppose we already get the model_converging_best.pt under the "model" directory.
I tried to load the pre-trained model using --save, --load and --pretrain, but all not working. 
Thanks
