The original FFHQ was designed to cover a lot of ethnicities, but maybe it didn't cover very dark skin enough? Alternately, it might be related to the 'truncati

The original FFHQ was designed to cover a lot of ethnicities, but maybe it didn't cover very dark skin enough? Alternately, it might be related to the 'truncation trick': images at the 'edge' of the latent space get dropped to assure high quality at the cost of covering the entire distribution. If very black skin got mapped to a compact cluster at the edge, say, the truncation trick could hypothetically lead to few such samples despite representation. To test this you would generate images with very high psi to see if they come out more often.