How can i get the start and the end indexes of a drift while using StreamGenerator Class ?

[kndbvortex]

I have generated some data with drift (abrupt, gradual, recurrent, and incremental). I want to compare some drift detectors algorithm on each but for that, I need the specific starting and ending position of where the drift occurs. Any idea?

For example, between 500 to 1000 and 2000 to 2500, I think the drifts occur but I'm not sure, and for what I want to do this needs to be precise. In red we can see concept probability, in blue the stream generated and other plots are drifts detectors.

Thanks in advance.