On Wed, Sep 15, 2021 at 9:20 AM Adrian Borucki <[email protected]> wrote: > > As a side note about the potential performance of the image grammar described > in the README: > A nice thing about using cardinal directions to relate structure elements to > one another gives you translation invariance “for free”: for example you can > shift a face around the image and its elements will be always oriented in the > same way to each other. > What it does *not* give you is rotational invariance: for instance, in the > face detection example you relate eyes as having this East-West relationship > — that won’t be the case if a face is sideways, it will be North-South. Then > there are two sideways directions and upside-down too… > That said, it seems to me that a learned grammar should still exclude at > least some structures that are not faces, like if one eye is on the other > side of the mouth. It is going to be more complicated than what is proposed > in the README though.
Yes, to all of these. The cardinal directions were meant to be simple examples. Rotational invariance could be achieved by... I dunno .. maybe haar wavelets in polar coordinates or something like that. That would be for later... Sometimes you want rotational invariance, and sometimes you don't. For stop lights, you always want the red light above the green light. For the German flag, you always want the black bar above the yellow bar. There is a famous old experiment in neuroscience, where volunteers wear eyeglass prisms that reverse everything left-right, or up-down. It takes them a few days to adapt, but after that, everything seems completely normal ... until they take off the glasses! At any rate, all initial examples have to be simple... --linas -- Patrick: Are they laughing at us? Sponge Bob: No, Patrick, they are laughing next to us. -- You received this message because you are subscribed to the Google Groups "opencog" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/opencog/CAHrUA37NCyuvAZ0CN3tkaEZCqWuhyTuWwQzQGyRC3UBY__63yw%40mail.gmail.com.
