Qwen3-4B-Base GRPO
GRPO reinforcement learning on the local math training split with a rule-based math reward.
This repository contains the final merged Hugging Face checkpoint from global_step_100.
The training checkpoint was saved from FSDP shards and merged to safetensors for this upload.
Training Method
- Policy loss: GRPO.
- Advantage estimator:
grpo, with normalized group advantages. - Rollout correction: token-level importance sampling with threshold 2.0.
- Reward function: local math
compute_scorereward manager. - Fine-tuning type: full-parameter FSDP training, not LoRA.
Training Hyperparameters
| Field | Value |
|---|---|
| Base model | Qwen/Qwen3-4B-Base |
| Train file | /home1/irteam/SDPO/self-distillation-analysis/data/math/train.parquet |
| Validation file | /home1/irteam/SDPO/self-distillation-analysis/data/math/evaluation/aime24.parquet |
| Train max samples | 25600 |
| Train batch size | 256 |
| Rollouts per prompt | 8 |
| PPO mini batch size | 128 |
| PPO micro batch size per GPU | 1 |
| Optimizer | AdamW |
| Learning rate | 1e-06 |
| Weight decay | 0.01 |
| LR warmup steps | 10 |
| Total training steps | 100 |
| Save frequency | every 10 steps |
| Validation frequency | every 10 steps |
| Max prompt length | 2048 |
| Max response length | 20480 |
| Rollout backend | vllm |
| Rollout temperature | 1 |
| Rollout top_p | 1 |
| vLLM GPU memory utilization | 0.75 |
| Actor strategy | fsdp |
| Dtype | bfloat16 |
| Advantage estimator | grpo |
| Gamma / Lambda | 1 / 1 |
| KL loss enabled | False |
| KL loss coefficient | 0.001 |
| Checkpoint uploaded | math-GRPO-Qwen3-4B-Base-128-train256-rollout8-lr1e-6-vllm0.75-modelQwen-Qwen3-4B-Base/global_step_100 |
| W&B run id | wwq8h0zc |
Training Score
The plot below shows critic/score/mean logged during training.
CSV data is included in training_score.csv.
| Metric | Value |
|---|---|
| Final training step | 100 |
Final critic/score/mean | 0.336426 |
Final val-core/math_dapo/acc/mean@1 | 0.133333 |
Intended Use
This model is intended for internal research and analysis of math-focused RL fine-tuning methods. It has not been broadly safety evaluated for production use.
Limitations
The model was trained for 100 optimization steps on a local math dataset split. Reported scores are training-time reward/validation metrics from the same experiment setup and should not be treated as broad benchmark results.