---
base_model: Qwen/Qwen3-8B
library_name: transformers
tags: [grpo, verl, donor-game, cooperation, reciprocity]
---
# donorsim-qwen3-8b-modeAB-step51

Qwen3-8B fine-tuned with GRPO (verl 0.7.1, LoRA r16/alpha32 merged into bf16 weights) on the
iterated Donor's Game, Stage 2 (group games, K in {2,4,6}, within-group partner rotation with
w = 1/(K-1)), mixed Mode A/B (50% of scenarios with real groupmate discussion).

True training step 51. Lineage: [donorsim-qwen3-8b-modeAB-step6](https://huggingface.co/3l3ktr4/donorsim-qwen3-8b-modeAB-step6)
(steps 1-6, fixed partner) -> steps 7-11 on 4 GPUs -> steps 12-51 on 8 GPUs (run
`qwen3_8b_recipT2_modeAB_from_step11_64steps_20260827_055004`, global_step_40).

Merged full weights, loadable directly with `transformers` or vLLM (no adapter needed).