Model Card for qwen-2.5-3b-r1-countdown a mini R1 experiments

This model is a fine-tuned version of Qwen/Qwen2.5-3B-Instruct. It has been trained using TRL and GRPO on the Countdown game.

If you want to learn how to replicate this model and reproduce your own Deepseek R1 "aha" moment, check out my blog post.

Quick start

from vllm import LLM, SamplingParams
from datasets import load_dataset
from random import randint

sampling_params = SamplingParams(temperature=0.8, top_p=0.95, max_tokens=512)

# use revision without "checkpoints-" as vLLM downloads all of them
llm = LLM(model="philschmid/qwen-2.5-3b-r1-countdown", revision="099c0f8cbfc522e7c3a476edfb749f576b164539")

# Load dataset from Hugging Face Hub
dataset_id = "Jiayi-Pan/Countdown-Tasks-3to4"
dataset = load_dataset(dataset_id, split="train")
sample = dataset[randint(0, len(dataset))]  

# create conversation
messages = [
    {"role": "system", "content": "You are a helpful assistant. You first thinks about the reasoning process in the mind and then provides the user with the answer."},
    {"role": "user", "content": f"Using the numbers {sample['nums']}, create an equation that equals {sample['target']}. You can use basic arithmetic operations (+, -, *, /) one or multiple times but each number can only be used once. Show your work in <think> </think> tags. And return the final equation in <answer> </answer> tags, for example <answer> (1 + 2) / 3 </answer>. Think step by step inside <think> tags."},
    {"role": "assistant", "content": "Let me solve this step by step.\n<think>"}
]
# generate response
res = llm.generate(llm.get_tokenizer().apply_chat_template(messages, tokenize=False, continue_final_message=True), sampling_params)
res = "<think>" + res[0].outputs[0].text
print(res)

# <think> We need to use the numbers 37, 15, 4, and 13 with basic arithmetic operations to make 16. Let's try different combinations:
# - 37 - 15 - 4 - 13 = 6 (too low)
# - 37 - 15 + 4 - 13 = 13 (too low)
# - 37 + 15 - 4 - 13 = 35 (too high)
# - 37 - 15 + 4 + 13 = 39 (too high)
# - 15 + 4 + 13 - 37 = -1 (too low)
# - 37 + 15 + 4 - 13 = 43 (too high)
# - 15 + 4 * 13 / 37 = 15 + 52 / 37 (not an integer)
# - 15 * 4 / 37 - 37 = -28.24 (not a whole number)
# - 4 * 13 / 15 - 37 = 41.3333 (not a whole number)
# After all combinations, I got not any integer result as 16.
# </think>
# <answer> 37 - 15 + 4 + 13 </answer>

Training procedure

This model was trained with GRPO, a method introduced in DeepSeekMath: Pushing the Limits of Mathematical Reasoning in Open Language Models.

Framework versions

• TRL: 0.14.0
• Transformers: 4.48.1
• Pytorch: 2.5.1+cu121
• Datasets: 3.1.0
• Tokenizers: 0.21.0