Gemma Scope: Open Sparse Autoencoders Everywhere All At Once on Gemma 2
Authors: name: Tom Lieberum, name: Senthooran Rajamanoharan, name: Arthur Conmy, name: Lewis Smith, name: Nicolas Sonnerat, name: Vikrant Varma, name: János Kramár, name: Anca Dragan, name: Rohin Shah, name: Neel Nanda

Sparse autoencoders (SAEs) are an unsupervised method for learning a sparse
decomposition of a neural network's latent representations into seemingly
interpretable features. Despite recent excitement about their potential,
research applications outside of industry are limited by the high cost of
training a comprehensive suite of SAEs. In this work, we introduce Gemma Scope,
an open suite of JumpReLU SAEs trained on all layers and sub-layers of Gemma 2
2B and 9B and select layers of Gemma 2 27B base models. We primarily train SAEs
on the Gemma 2 pre-trained models, but additionally release SAEs trained on
instruction-tuned Gemma 2 9B for comparison. We evaluate the quality of each
SAE on standard metrics and release these results. We hope that by releasing
these SAE weights, we can help make more ambitious safety and interpretability
research easier for the community. Weights and a tutorial can be found at
https://huggingface.co/google/gemma-scope and an interactive demo can be found
at https://www.neuronpedia.org/gemma-scope