Does anyone know what’s the reason for adding ‘2’ after ‘cv’?
it’s quite simple. there was a cv module in the 1.0 api, (about a decade ago !)
when they changed to a c++ api with 2.x, the corresponding python module had to be renamed, too.
(it’s really a different api)
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So why there is no cv3, cv4 and may be cv5 
?