Well, time for some results.
With the model version got on epoch #8200 i tested it on 36 real images (some of them among traing files).
Initially i tested with the original file dimensions, but this does not work - it seems that the evaluated images need to be squared, so i decided to rescale/crop them to 1024x1024.
From the results - 29 of the masks are OK, which is ~80% accuracy - quite good (on the same set of images my own record was 26/36)!
What surpised me are the results on 005, 019 and 038. They are very similar to what i got using color masks.
