---
title: "Extracting Latent Steering Vectors from Pretrained Language"
description: "Controllable text generation usually requires training something extra, such as a decoding module, a… 51 references, cited by 100 papers here."
authors: ["Nishant Subramani", "Nivedita Suresh", "Matthew Peters"]
year: 2022
venue: "Findings of the Association for Computational Linguistics: ACL 2022"
source: "https://aclanthology.org/2022.findings-acl.48/"
doi: "10.18653/v1/2022.findings-acl.48"
licence: "CC BY 4.0 (ACL Anthology)"
licence_url: "https://creativecommons.org/licenses/by/4.0/"
summary_licence: "Elamur Cosmic License"
canonical: "https://research.elamur.ai/free/en/papers/subramani-2022-extracting-latent-steering-vectors-pretrained/"
---
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# Extracting Latent Steering Vectors from Pretrained Language Models

**Authors:** [Nishant Subramani](https://md.research.elamur.ai/free/en/authors/nishant-subramani/), Nivedita Suresh and [Matthew Peters](https://md.research.elamur.ai/free/en/authors/matthew-peters/) · **Year:** 2022 · **Venue:** [Findings of the Association for Computational Linguistics: ACL 2022](https://md.research.elamur.ai/free/en/venues/findings/) ([Findings of the Association for Computational Linguistics 2022](https://md.research.elamur.ai/free/en/venues/findings/2022/)) · **Publisher:** [Association for Computational Linguistics](https://md.research.elamur.ai/free/en/publishers/association-for-computational-linguistics/) · **Licence:** [CC BY 4.0 (ACL Anthology)](https://creativecommons.org/licenses/by/4.0/)

**Links:** [Publisher's page](https://aclanthology.org/2022.findings-acl.48/) · [PDF](https://aclanthology.org/2022.findings-acl.48.pdf) · [DOI 10.18653/v1/2022.findings-acl.48](https://doi.org/10.18653/v1/2022.findings-acl.48) · [OpenAlex](https://openalex.org/W4285149215)

**Citations:** 31 citations (OpenAlex, 2026-10-14) · [100](https://md.research.elamur.ai/free/en/papers/subramani-2022-extracting-latent-steering-vectors-pretrained/cited-by/) in our library, of the 141,840 papers whose bibliographies we read

## Summary
Controllable text generation usually requires training something extra, such as a decoding module, a prompt, fine-tuned weights, or an autoencoder with an editable latent space. This paper asks whether a frozen pretrained decoder already contains enough information to be steered toward any chosen sentence. The authors keep GPT-2 (117M) fixed and use Adam to optimize one fixed-length vector, z_steer, for each target sentence. The vector is added to the hidden states and tuned to maximize the likelihood of that sentence. They compare injection locations and timesteps on an evaluation set built from four domains: Cornell Movie Dialogs, NLTK's Gutenberg, Gigaword and WikiText-103. When the vector enters the middle of the transformer stack, greedy decoding reproduces targets almost exactly, scoring above 99 BLEU. Simple offset arithmetic on these vectors performs unsupervised sentiment transfer on Yelp about as well as task-specific autoencoder systems. Vector distances also track sentence similarity on STS-B better than pooled hidden states or GloVe. The findings indicate that frozen LMs can be controlled through a latent space without any retraining.

## Key points
- **Recovery by injection location:** Smoothed BLEU-4 reaches 100.0 when z_steer is injected at all timesteps after layer 6 self-attention or after layer 7 feed-forward. Injecting only at the first timestep still gives 99.80 and 99.25 respectively. Injection at the embedding layer (33.99) or the LM head (6.72) performs poorly.
- **Evaluation data:** Sentences were split into 8 length bins ranging from 5 to 128 words, and 8 sentences were sampled per bin from each domain. Vectors from different random seeds cluster tightly for the same sentence, which shows the extraction is robust.
- **Not mere memorization:** The authors built "gibberish" (random tokens) and "shuffled" (scrambled word order) control sets. Recovery is best on real books text, lower on shuffled text, and lowest on gibberish. This suggests the vectors exploit the model's knowledge and encode word order.
- **Prompt-style variant:** Prepending k steering vectors to the input embeddings works worse. Even k = 50 does not match a single vector injected into the hidden states.
- **Style transfer benchmarks:** Results on Yelp and StylePTB are comparable to dedicated models. On STS-B, the method falls short of lexical methods and NLI-fine-tuned methods. Code is released on GitHub (nishantsubramani/steering_vectors).

*Our summary of the paper, in our own words — not its text. The work belongs to its authors; read it at the links above.*

## Institutions

- [Allen Institute for Artificial Intelligence](https://md.research.elamur.ai/free/en/labs/allen-institute-for-artificial-intelligence/) — Research institute, Seattle, United States · 219 works · 89,712 citations

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## Cite

Cite as: Nishant Subramani, Nivedita Suresh and Matthew Peters. 2022. Extracting Latent Steering Vectors from Pretrained Language Models. Findings of the Association for Computational Linguistics: ACL 2022.

The paper itself, not this page. BibTeX from the library's record of the work.

```bibtex
@inproceedings{subramani2022extracting,
  title = {{Extracting Latent Steering Vectors from Pretrained Language Models}},
  author = {Nishant Subramani, Nivedita Suresh and Matthew Peters},
  booktitle = {Findings of the Association for Computational Linguistics: ACL 2022},
  year = {2022},
  doi = {10.18653/v1/2022.findings-acl.48},
  url = {https://doi.org/10.18653/v1/2022.findings-acl.48}
}
```

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*Updated 24 October 2026*