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Is it an error?
No it is not, it is a warning. Basically given your data and your settings, you have reached the desired efficiency with the model finished after stage 7. In other to combine the training results, now rerun your training with parameter -numStages set to 8, since we start counting at 0. Then your cascade folder will have a cascade.xml file.
Why is this happening?
It cannot find enough training data for a next stage. Try increasing the number of samples that you have!
