Add dataset card with paper link, task category and sample usage

README.md

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+---
+task_categories:
+- text-generation
+language:
+- en
+---
+
+# ReOPD Prefix Pool
+
+This repository contains a prefix pool dataset from the paper [Multi-Turn On-Policy Distillation with Prefix Replay](https://huggingface.co/papers/2607.04763).
+
+ReOPD (Replayed-Prefix On-Policy Distillation) distills a teacher agent into a student **without environment interaction during student training**: the student acts on prefixes replayed from pre-collected teacher trajectories, while the teacher supplies dense per-step supervision. The prefix pool is built from the teacher's RL rollouts with a step-decaying sampling schedule (`p_t ∝ κ^t`, κ = 0.6), favoring early, low-shift prefixes. It matches or improves online OPD accuracy with **zero tool calls** and **4–9× faster rollouts**.
+
+- Project page: https://baohaoliao.github.io/ReOPD/
+- Code: https://github.com/BaohaoLiao/ReOPD
+- Hugging Face collection: https://huggingface.co/collections/baohao/reopd
+
+## Sample usage
+
+From the [Github repository](https://github.com/BaohaoLiao/ReOPD):
+
+Download the prefix pool:
+
+```bash
+hf download baohao/Math_Qwen3-8B_SFT-RL_Prefix --repo-type dataset --local-dir /data/pool
+```
+
+Then use it as `PROMPT_DATA` in the ReOPD distillation script:
+
+```bash
+TEACHER=qwen3-8b STUDENT=qwen3-4b \
+TEACHER_MODEL_PATH=/ckpt/teacher_hf \
+HF_CHECKPOINT=/ckpt/student_hf \
+REF_LOAD=/ckpt/student_torch_dist \
+PROMPT_DATA=/data/pool/train.jsonl \
+SAVE_DIR=/runs/reopd_8b_to_4b \
+    bash scripts/train/reopd_math.sh
+```