license: gemma
library_name: transformers
pipeline_tag: image-text-to-text
base_model: google/gemma-3-4b-it
💎 Gemma 3 4B IT Abliterated
This is an uncensored version of google/gemma-3-4b-it created with a new abliteration technique.
See this article to know more about abliteration.
This is a new, improved version that targets refusals with enhanced accuracy.
I recommend using these generation parameters: temperature=1.0, top_k=64, top_p=0.95.
⚡️ Quantization
- QAT: https://huggingface.co/mlabonne/gemma-3-4b-it-qat-abliterated
- GGUF: https://huggingface.co/mlabonne/gemma-3-4b-it-abliterated-v2-GGUF
✂️ Abliteration
The refusal direction is computed by comparing the residual streams between target (harmful) and baseline (harmless) samples.
The hidden states of target modules (e.g., o_proj) are orthogonalized to subtract this refusal direction with a given weight factor.
These weight factors follow a normal distribution with a certain spread and peak layer.
Modules can be iteratively orthogonalized in batches, or the refusal direction can be accumulated to save memory.
Finally, I used a hybrid evaluation with a dedicated test set to calculate the acceptance rate. This uses both a dictionary approach and NousResearch/Minos-v1.
The goal is to obtain an acceptance rate >90% and still produce coherent outputs.