Read
Capture final-token residual states after the transformer blocks you select.
Native representation engineering
Understand what a model represents. Change its direction.
Ster turns hidden states into explicit, measured steering artifacts — and applies them inside a Rust decoder loop built for exact intervention points.
direction
layer 18margin +2.41
One continuous path
From contrastive examples to controlled generation.
No framework handoff, no opaque pickle, no guessed intervention point.
Learn
Fit CAA, PCA, or logistic directions from matched contrastive examples.
Measure
Compare layer and method candidates on held-out pair-ordering accuracy and margin.
Steer
Add a validated direction to the residual stream during native autoregressive generation.
Fail-safe artifacts
A vector carries its identity.
Every artifact records product and schema identity, model revision, hidden width, method, layers, accuracy, and margin. Ster refuses the wrong model or residual stream.
Artifact contract →truthful.ster.jsonschema 1
- model
- meta-llama/Llama-3.2-1B
- method
- caa
- layer
- 18
- accuracy
- 0.92
- margin
- 2.41
Install
One command. One native binary.
shell
Choose a backendcargo install --git https://github.com/wisent-ai/ster --lockedSter 0.12