The mechanics of knowledge shaping #
Curating what an AI "knows" happens at three distinct stages of the AI workflow. If you're building a production-ready agent, you've likely encountered these levers:
-
Pre-training Data Filtering: This is the most aggressive method. By scrubbing the initial dataset of specific topics or weighting certain sources more heavily, developers can effectively "blind" the model to certain perspectives or amplify others before a single gradient descent step occurs.
-
SFT and RLHF: Supervised Fine-Tuning (SFT) and Reinforcement Learning from Human Feedback (RLHF) act as the behavioral layer. Even if a model "knows" a fact from its pre-training, RLHF can train it to prioritize a different answer or decline to answer entirely. This is where most of the "personality" and alignment of a model is baked in.
-
** RAG and Context Injection**: This is the most practical tutorial for developers today. Instead of trying to bake knowledge into the weights, we use Retrieval-Augmented Generation (RAG). By controlling the vector database, you can ensure the LLM only references "approved" or "accurate" documents, effectively overriding the model's internal parametric memory with external, curated data.
The tradeoff between neutrality and alignment #
There is a constant friction between a "neutral" model and an "aligned" model. A completely neutral model is often useless because it lacks the guardrails needed for a professional environment. However, over-curating can lead to "model collapse" or hallucinations where the AI tries to force a curated answer onto a prompt that doesn't fit.
For those of us focused on prompt engineering, this means we have to be hyper-aware of the underlying bias of the model we are using. A model trained on a Western-centric dataset will have a different "worldview" than one trained on a curated regional dataset. When deploying a global LLM agent, the strategy should be to use a base model with broad knowledge but implement a strict RAG layer to handle region-specific knowledge requirements. This prevents the model from hallucinating based on its training weights and keeps the output grounded in verifiable, curated facts. Gemini actually knows nothing about Tunisian folk poetry until 6d ago
[OpenAI spent months training models that were actively 9d ago](/en/news/5466/)
[Next Amazon is using rare books to train its AI models →](/en/news/6681/)