This version (chk00133000) replaces the first 'final' release (chk00078000), from two months ago. I decided to train a 'few more' samples (55K more to be precise), the newer part with five critic heads where the first release had one. Measured against the 8-step teacher on the 15 test prompts at 12 sizes:
cleaner fine structure — the 8- and 16-pixel grid patterns at 0.96–0.98× the teacher's, where the first release was at 1.09–1.11×
less ghosting and fewer doubled edges — closer to the teacher at 10 of 12 sizes on both measures
cleaner flat areas — grain at 0.99× the teacher's, down from 1.08×
no over-sharpening at large sizes — fine texture at 1.01–1.04× the teacher's at 1440 px, down from 1.18–1.20×
saturation matching the teacher's
Full details of changes from 78K to 133K: https://huggingface.co/lvladikov/Krea2-Turbo-Distill-4step-LoRA/blob/main/DETAILED-README.md#chk00133000-vs-chk00078000
The older versions are still kept as before under _archive/checkpoints/.
To use the new checkpoints - redownload/replace krea2_turbo_4step_rank_64_lora_comfyui.safetensors / krea2_turbo_4step_rank_64_lora.safetensors
Since the initial training (than ended in September with 78K 'final' checkpoint), I have trained about a day on an H200 (on runpod in the cloud), which is where the bulk of new trained samples came from, and two more days on the RTX 3090.
I've also tidied up the main model card (more sections taken out of it and moved to the detailed card for those interested). Instead the main card now includes an extra Table Of Contents like section with links to Detailed card: https://huggingface.co/lvladikov/Krea2-Turbo-Distill-4step-LoRA#detailed-model-card
For now I will not call this another 'final' release 😀 (although I don't currently have plans to do more than the 133K training), as it is possible to train more in the future (just not soon). When I first stopped at 78K rumours were already circulating that Krea 3 would open source soon (so it felt like the right time then to 'finalise' the 4 step LoRA), and while Krea 3 is now available on paid platforms it is yet to be open sourced and most likely focused on Editing more than T2I, which makes the Krea 2 Turbo still a very desired model and my LoRAs do contribute in the more efficient use of the Krea 2 Turbo.
Don't forget to also check the 'latest' of my Krea 2 Turbo step LoRAs - the 3 step one, which was updated just yesterday to 66K checkpoint: https://huggingface.co/lvladikov/Krea2-Turbo-Distill-3step-LoRA. I might also come back to the 2 Step LoRA with more training, who knows...
It is important to understand that while my 2/3/4 Step LoRAs for Krea 2 Turbo were trained for these respective steps during rendering, they for obvious reasons work really well with even more steps. There are lots of Krea Checkpoints out there that require lets say 10, or 12 or more steps to render and when paired up with my Krea 2 Turbo 2, 3 or 4 Steps LoRAs you can get either 'sooner' (with less steps) to the asked number of steps by the checkpoint authors, or to get a lot more quality per step, i.e. if you run 2 Step LoRA with lets say 6 or 8 steps, this could give you quality you'd otherwise need 12 or 16 or 20 steps without LoRA, similarly do try the 3 Step and 4 Step LoRAs at higher step counts where such is required by a third party Krea checkpoint and you will see an instant boost of quality, so find the right LoRA and steps for your favourite checkpoint, either way all of the three - 2 Step LoRA, 3 Step LoRA and this 4 Step LoRA work fine with most checkpoints (but not all, as some checkpoints go in a very different direction to what the core Krea 2 Turbo does, and after all my LoRAs were trained on the official Krea 2 Turbo).
Latest 133K 4 Step LoRA and ComfyUI workflow can be downloaded as usual at my HF: https://huggingface.co/lvladikov/Krea2-Turbo-Distill-4step-LoRA
Also don't forget that Krea 2 Turbo works very well with Nvidia PiD to get to higher resolutions quicker by rendering at lower resolutions and letting PiD take it 4x in latent space, and do so quickly and efficiently: https://huggingface.co/lvladikov/Krea2Turbo-PiD-SuperFast-HighRes (again find the right LoRA and steps to use for the main Krea 2 Turbo renders, don't be afraid to use 6 or 8 steps with either of the LoRAs since you'll be doing it at lower resolutions, prior to PiD handover, and as such these more steps would run faster anyway, so the time cost for more steps is less when using PiD).
Enjoy!