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HAAR training fails at different stages

I run opencv_traincascade for say 20 stages. It fails at stage 15 saying:

Required leaf false alarm rate achieved. Branch training terminated.

Than I run opencv_traincascade for 15 stages, this time it fails at stage 13. Then I run for 13 stages, this time it fails at stage 12 etc..

How can this happen? Looking at output values are same at each run, but fails at different stages.

HAAR training fails at different stages

I run opencv_traincascade for say 20 stages. It fails at stage 15 saying:

Required leaf false alarm rate achieved. Branch training terminated.

Than I run opencv_traincascade for 15 stages, this time it fails at stage 13. Then I run for 13 stages, this time it fails at stage 12 etc..

How can this happen? Looking at output output, values are same at each run, but fails at different stages.