docs/source/paper_index.md

# Paper Index

<Tip warning={true}>

Section under construction. Feel free to contribute!

</Tip>

## Group Sequence Policy Optimization

**📜 Paper**: https://huggingface.co/papers/2507.18071

GSPO is a GRPO variant that computes importance sampling weights at the sequence level instead of per-token. To reproduce the paper's setting, use this configuration:

```python
from trl import GRPOConfig

training_args = GRPOConfig(
    importance_sampling_level="sequence",
    loss_type="grpo",
    beta=0.0,  # GSPO set kl regularization to zero: https://github.com/volcengine/verl/pull/2775#issuecomment-3131807306 
    epsilon=3e-4,  # GSPO paper (v2), section 5.1
    epsilon_high=4e-4,  # GSPO paper (v2), section 5.1
    gradient_accumulation_steps=1,
    steps_per_generation=4,  # partition rollout batch into 4 mini-batches. GSPO paper (v2), section 5.1. Must be 4 times gradient_accumulation_steps
)
```