Cross-Architecture Personality Vector Transfer: A New Paradigm for Controllable Personality in Large Language Models

A breakthrough study has achieved cross-architecture personality vector transfer, marking the first time that personality representation can transcend the limitations of specific model architectures. This system can extract personality vectors from Qwen2.5-7B and control the behavior of GPT-OSS 20B, opening up new paths for AI safety monitoring and controllable generation.

Personality control of LLMs is a core challenge in AI safety. Traditional fine-tuning or prompt engineering methods are costly and have limited effectiveness. In 2024, Chen et al. proposed the concept of personality vectors, arguing that personality can be encoded in the internal activation states of models.

The project achieves cross-architecture transfer, extracting vectors from Qwen2.5-7B and applying them to GPT-OSS 20B. Theoretically, this implies that LLMs share a universal personality representation mechanism; practically, it can reduce costs through research on small models.

1. Direct activation injection: For open-source models like Qwen/Llama/Mistral, dynamic layer selection and PyTorch hook mechanisms are used to adapt to 32-layer architectures; 2. Parameter modulation: For GPT-OSS 20B, dynamically adjust temperature/top_p parameters and support Metal acceleration.

Preset traits such as humor vs. seriousness, dishonesty vs. honesty, etc., are quantitatively scored through comparative instruction pairs and 40 evaluation questions; supports custom trait generation; provides dynamic thermostat visualization, dual-axis charts to display coherence and trait intensity, and five-point spectrum analysis to depict behavioral changes.

Positive applications include AI safety monitoring, personalized assistants, and alignment research; ethical considerations involve risks of malicious use, regulatory challenges, and transparency requirements, and the authors emphasize responsible use.

System requirements: Python 3.12+, Apple Silicon/CUDA GPU, 16GB+ RAM; models need to be obtained from HuggingFace (some require permission); startup process includes cloning the repository, running the installation script, and launching the web application.

Cross-architecture personality vector transfer marks an important progress in LLM control research, reveals the universal structure of personality representation, opens up new directions for future AI research, and at the same time requires the improvement of ethical frameworks and regulatory mechanisms.