How to use from the
Use from the
Diffusers library
pip install -U diffusers transformers accelerate
import torch
from diffusers import DiffusionPipeline
from diffusers.utils import load_image

# switch to "mps" for apple devices
pipe = DiffusionPipeline.from_pretrained("black-forest-labs/FLUX.2-klein-9B", dtype=torch.bfloat16, device_map="cuda")
pipe.load_lora_weights("KiwiMate/KiwiMate-Image-Fast-1.0")

prompt = "Turn this cat into a dog"
input_image = load_image("https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/diffusers/cat.png")

image = pipe(image=input_image, prompt=prompt).images[0]

KiwiMate Image Fast 1.0

A speed-tuned fine-tune of black-forest-labs/FLUX.2-klein-9B, trained with ai-toolkit to produce clean, sharp images in very few steps.

Image inputs supported — like its base model, this fine-tune can take images as inputs, so you can drive generation with reference photos, restyle or edit your own pictures, and do full image-to-image workflows, not just text-to-image.

What's in the repo

File Description
KiwiMate-Image-Fast-1.0-merged.safetensors Standalone merged checkpoint (~17 GB). Drop into models/checkpoints and run — no base model needed.
KiwiMate-Image-Fast-1.0.safetensors Final LoRA adapter (step 3000, rank 32, ~158 MB). Apply on top of the original flux-2-klein-9b checkpoint at full strength.
checkpoints/ Intermediate LoRA checkpoints every 250 steps (250–2500), if you want an earlier snapshot.
merge_lora.py Dependency-light script used to merge the LoRA into the base checkpoint (numpy only, streams tensor-by-tensor, resumable).

Sample gallery

All samples below were generated by the final step-3000 weights.

chess park explosion cafe portrait bw horse dj fisheye bw beach shark thumbs up
Prompt-driven scene: chess picnic with a fireball behind (color) Monochrome café portrait, bokeh, holding coffee cup Fisheye horse DJ at the decks under a disco ball Beach guy giving thumbs-up next to a leaping shark
snow cabin rock singer bw woodworker bw studio model
Cozy log cabin deep in snow-capped mountains High-energy live rock singer on stage (B&W) Craftsman hand-repairing a chair in his workshop (B&W) Clean studio fashion shot on white seamless background
sign guy bulldog biker kiwimate neon bird ink wash bw
Text rendering: "thiss is a sign" held up in grainy monochrome Sepia bulldog riding a chopper across the dunes Neon KiwiMate storefront glowing on a rainy night Bird soaring over misty peaks, ink-wash style (B&W)
trains bw
Split-track commuter trains meeting head-on (B&W)

The set shows off speed-friendly fundamentals: good anatomy (hands, faces, animals), legible signage/text, strong lighting (stage rays, neon reflections), stylized monochrome looks, and larger scenes that hold detail without burning many sampling steps.

Usage

ComfyUI:

# Merged checkpoint — drag straight into models/checkpoints
huggingface-cli download KiwiMate/KiwiMate-Image-Fast-1.0 KiwiMate-Image-Fast-1.0-merged.safetensors --local-dir models/checkpoints

Or stack the adapter on the unmodified base instead:

# Standalone LoRA on top of black-forest-labs/FLUX.2-klein-9B at strength ~1.0
huggingface-cli download KiwiMate/KiwiMate-Image-Fast-1.0 KiwiMate-Image-Fast-1.0.safetensors --local-dir models/loras

For image-input workflows (reference images / edits / img2img), load your source picture the same way you would with stock FLUX.2 Klein — the LoRA is name-compatible with the native BFL single-file key layout (double_blocks / single_blocks).

Want to reproduce or tweak the merge itself? merge_lora.py rebuilds the standalone checkpoint from the base + LoRA pair:

pip install numpy
python merge_lora.py \
  --base flux-2-klein-9b.safetensors \
  --lora KiwiMate-Image-Fast-1.0.safetensors \
  --output merged.safetensors

Training details

License

This fine-tune inherits the licensing terms of the base model. Please review FLUX.2-klein-9B's own license terms before commercial use.

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