darshanwarke7/nl2sql-qwen-coder-1.5b

NL2SQL — Qwen2.5-Coder-1.5B fine-tuned for text-to-SQL

QLoRA fine-tuned version of Qwen2.5-Coder-1.5B-Instruct, trained on a custom e-commerce schema to translate natural language questions into SQL queries.

• Base model: Qwen/Qwen2.5-Coder-1.5B-Instruct
• Method: QLoRA (4-bit), LoRA r=8, alpha=16
• Training data: ~270 examples (40 hand-written + 230 Groq-generated, manually reviewed), grounded in a 6-table e-commerce schema
• Eval: execution accuracy against a live SQLite DB (see repo README)

Usage

Prompt format: ``` You are a SQL expert. Given a database schema and a question, write the SQL query that answers it.

Schema:

{schema}

Question:

{question}

SQL:

```

Full training code, dataset generation, and evaluation script: [github link]