Continuing training from given stage

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I tried to train with traincascade until the 8th stage. I know, it is few. Now that's why I want to reteach the classifier until 12th stage.

My first question is that if I do not modify other parameters than the maximum number of stages, will the first 8 stage change? I compared the output results, but at the time I did not noticed any difference (except precalculation time).

If no, my second question is that, can I reteach only continuing from the 9th (number 8) stage to get a working cascade? And if I can reteach, how? I could not find any parameter related to this.

I know, there was more post related to this issue, but I couldn't get clear answer to my question.

Thanks!