qwen3-8b-glp

Paper: Efficient Reasoning Training Does Not Always Harm CoT Faithfulness and Monitorability

Collection: Efficient Reasoning: CoT Faithfulness & Monitorability

Method: Within-group length penalty from Kimi k1.5 (Kimi Team, 2025)

Hyperparameters

Base model Qwen/Qwen3-8B
Method Within-Group Length Penalty (GLP)
Released as LoRA adapter, step 200
Length-reward weight / warm-up 0.1 / 100 steps
LoRA rank 16, alpha 32, dropout 0, all attention and MLP projections
Optimiser AdamW, learning rate 1e-5, KL coefficient 0
Batch 32 prompts x 16 generations
Sampling temperature 0.8, top-p 0.95
Data numina_amc_aime (PRIME Eurus-2-RL-Data), ~2,223 prompts
Checkpoint selection AIME22, every 50 steps
Hardware 2x NVIDIA GH200

Usage

from transformers import AutoModelForCausalLM, AutoTokenizer
from peft import PeftModel

base = AutoModelForCausalLM.from_pretrained("Qwen/Qwen3-8B", torch_dtype="auto", device_map="auto")
tok = AutoTokenizer.from_pretrained("Qwen/Qwen3-8B")
model = PeftModel.from_pretrained(base, "Samll/qwen3-8b-glp")
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