---
license: apache-2.0
base_model: Qwen/Qwen3-1.7B
tags:
  - biology
  - bio-posttrain
  - dna-rl
  - dna
library_name: transformers
---

# Bio-posttrain Qwen3-1.7B DNA RL

DNA reinforcement learning (GRPO) checkpoint from [How Post-Training Shapes Biological Reasoning Models](https://huggingface.co/collections/mims-harvard/bio-posttrain).

## Model details

- **Base model:** `Qwen/Qwen3-1.7B`
- **DNA encoder:** Evo2 `evo2_1b_base` (frozen; not included)
- **Embedding layer:** `blocks.20.mlp.l3`
- **SFT pool:** sft256 / LoRA rank 16
- **GRPO LoRA:** rank 16, alpha 32
- **Checkpoint:** step 1156

This repo contains the merged text LLM plus `dna_projection.pt`.

## Loading

Same layout as the DNA SFT model — see [bio-posttrain-qwen3-1.7b-dna-sft](https://huggingface.co/mims-harvard/bio-posttrain-qwen3-1.7b-dna-sft).

## Collection

Part of the [Bio-posttrain](https://huggingface.co/collections/mims-harvard/bio-posttrain) collection.