The model isn’t the hard part: the data pipeline I built to teach Gemma 4 E2B to read Indian GST invoices.

This is a submission for the Gemma 4 Challenge: Write About Gemma 4 How I fine-tuned a small Gemma 4 model on a Mac to extract 22 invoice fields privately, and why the data strategy mattered more than the prompt. I needed to read Indian GST invoices without sending them to an external API every time. Gemma 4 E2B is an open multimodal model designed for local and edge deployment, with a 128K context window, native system prompt support, and an instruction-tuned variant that is usable without a gi