New: SSIM image target

[htoyryla]

I have added ssim guidance. Use --tgt_image to specify a target image and --ssimw for target image weight.

Example.

I have trained a small four layer model to sample black and white shapes like this:

For target image I select:

and using text prompt "a charcoal drawing" I get

and after adding "no face" to the text prompt:

Note: Images have been intentionally left a bit noisy, as it matches better my idea here.

[htoyryla]

Another model, with samples like in:

Examples generated with ssim guidance of an image together with a light guidance from a text prompt:

[metaphorz]

I like these. Nice abstract art images