Build a Domain-Specific Embedding Model in Under a Day

If you are building a RAG (Retrieval-Augmented Generation) system, you have likely hit this wall: Everything works… until it doesn’t. General-purpose embedding models are trained to understand the internet; not your contracts, manufacturing logs, proprietary chemical formulations or internal taxonomy. They capture broad semantic similarity, but they do not understand the fine-grained distinctions that matter in your domain. Fine-tuning an embedding model can improve the performance of your retrieval pipeline when off-the-shelf models fail to effectively capture domain-specific nuances. Despite how critical embeddings are to RAG performance, the process remains surprisingly fragmented, the skills required are specialized, and the time investment is daunting.

With a single GPU and less than a day of training time, you can transform a general-purpose embedding model into one that truly understands your domain, no manual labeling required. To help you hit the ground running, we are also releasing a ready-to-use synthetic training dataset generated from NVIDIA's public documentation using this exact pipeline. Using this data and the recipe, we saw over 10% improvement in both Recall@10 and NDCG@10. Atlassian applied this recipe to fine-tune on their JIRA dataset, increasing Recall@60 from 0.751 to 0.951, a 26% improvement - on a single GPU.

🔗Quick Links to Dataset and Code:

Embedding Model
GitHub
Synthetic dataset on NVIDIA’s public documents

🧑‍💻Open Source Projects Recipe Integrates:

NeMo Data Designer for synthetic data generation
NeMo Automodel for embedding model training
BEIR for Information retrieval evaluation
NeMo Export-Deploy for ONNX/TensorRT conversion
NVIDIA NIM for production inference serving

📋Prerequisites:

⚙️Setup

In this tutorial, we will finetune the base model Llama-Nemotron-Embed-1B-v2 - a 1-billion-parameter embedding model that balances quality and inference cost. To get started, follow this setup guide.