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Model: CelineHuangxy/ICPO-Qwen3-1.7B-math
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---
base_model:
- Qwen/Qwen3-1.7B
datasets:
- Elliott/Openr1-Math-46k-8192
language:
- en
license: apache-2.0
metrics:
- accuracy
pipeline_tag: text-generation
library_name: transformers
---
# ICPO-Qwen3-1.7B-math
[![arXiv](https://img.shields.io/badge/arXiv-2510.26519-b31b1b.svg?logo=arxiv)](https://aclanthology.org/2026.findings-acl.132/)
[![GitHub](https://img.shields.io/badge/GitHub-ICPO-blue?logo=github)](https://github.com/Celine-hxy/ICPO)
[![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg?logo=apache)](LICENSE)
## Introduction
ICPO is an RLVR (Reinforcement Learning with Verifiable Rewards) approach presented in the paper [Think Outside the Policy: In-Context Steered Policy Optimization](https://arxiv.org/abs/2510.26519).
Existing Reinforcement Learning from Verifiable Rewards (RLVR) methods, such as Group Relative Policy Optimization (GRPO), have achieved remarkable progress in improving the reasoning capabilities of Large Reasoning Models (LRMs). However, they exhibit limited exploration due to reliance on on-policy rollouts which are confined to the current policy's distribution, resulting in narrow trajectory diversity. Recent approaches attempt to expand policy coverage by incorporating trajectories generated from stronger expert models, yet this reliance increases computational cost and such advanced models are often inaccessible. To address these issues, we propose In-Context Steered Policy Optimization (ICPO), a unified framework that leverages the inherent in-context learning capability of LRMs to provide expert guidance using existing datasets. ICPO introduces mixed-policy GRPO with implicit expert forcing, which expands exploration beyond the current policy distribution without requiring advanced LRM trajectories. To further stabilize optimization, ICPO integrates expert region reject sampling to filter unreliable off-policy trajectories and annealed expert-bonus reward shaping to balance early expert guidance with later autonomous improvement. Results demonstrate that ICPO consistently enhances RLVR performance and training stability on mathematical reasoning benchmarks, revealing a scalable and effective RLVR paradigm for LRMs.
## Inference
Here is an example of using ICPO models for inference:
```python
from transformers import AutoTokenizer
from vllm import LLM, SamplingParams
model_path="CelineHuangxy/ICPO-Qwen3-8B-math"
question = "which number is larger? 9.11 or 9.9?"
tokenizer = AutoTokenizer.from_pretrained(model_path)
messages = [{"role": "user", "content": question}]
chat = tokenizer.apply_chat_template(messages, tokenize=False, add_generation_prompt=True)
llm = LLM(model=model_path)
params = SamplingParams(temperature=0.6, max_tokens=32768)
outputs = llm.generate([chat], params)
print(outputs[0].outputs[0].text)
```
## Acknowledgements
LTE is built on the following repositories and we thank their teams for their valuable contributions to the community:
- [verl](https://github.com/volcengine/verl)
- [LUFFY](https://github.com/ElliottYan/LUFFY)
- [LIMO](https://github.com/GAIR-NLP/LIMO)
## Citation
If you find our work useful, feel free to cite our paper:
```bibtex
@inproceedings{huang2026think,
title={Think outside the policy: In-context steered policy optimization},
author={Huang, Hsiu-Yuan and Tang, Chenming and Liu, Weijie and Bai, Clive and Yang, Saiyong and Wu, Yunfang},
booktitle={Findings of the Association for Computational Linguistics: ACL 2026},
pages={2758--2776},
year={2026}
}
```

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{%- if tools %}
{{- '<|im_start|>system\n' }}
{%- if messages[0].role == 'system' %}
{{- messages[0].content + '\n\n' }}
{%- endif %}
{{- "# Tools\n\nYou may call one or more functions to assist with the user query.\n\nYou are provided with function signatures within <tools></tools> XML tags:\n<tools>" }}
{%- for tool in tools %}
{{- "\n" }}
{{- tool | tojson }}
{%- endfor %}
{{- "\n</tools>\n\nFor each function call, return a json object with function name and arguments within <tool_call></tool_call> XML tags:\n<tool_call>\n{\"name\": <function-name>, \"arguments\": <args-json-object>}\n</tool_call><|im_end|>\n" }}
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{{- '<|im_start|>system\n' + messages[0].content + '<|im_end|>\n' }}
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{%- for message in messages[::-1] %}
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{%- if ns.multi_step_tool and message.role == "user" and message.content is string and not(message.content.startswith('<tool_response>') and message.content.endswith('</tool_response>')) %}
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{%- set ns.last_query_index = index %}
{%- endif %}
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{%- if message.content is string %}
{%- set content = message.content %}
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{%- if message.reasoning_content is string %}
{%- set reasoning_content = message.reasoning_content %}
{%- else %}
{%- if '</think>' in content %}
{%- set reasoning_content = content.split('</think>')[0].rstrip('\n').split('<think>')[-1].lstrip('\n') %}
{%- set content = content.split('</think>')[-1].lstrip('\n') %}
{%- endif %}
{%- endif %}
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{%- if loop.last or (not loop.last and reasoning_content) %}
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{%- else %}
{{- '<|im_start|>' + message.role + '\n' + content }}
{%- endif %}
{%- else %}
{{- '<|im_start|>' + message.role + '\n' + content }}
{%- endif %}
{%- if message.tool_calls %}
{%- for tool_call in message.tool_calls %}
{%- if (loop.first and content) or (not loop.first) %}
{{- '\n' }}
{%- endif %}
{%- if tool_call.function %}
{%- set tool_call = tool_call.function %}
{%- endif %}
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{{- tool_call.name }}
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{%- if tool_call.arguments is string %}
{{- tool_call.arguments }}
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{%- endif %}
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{%- endif %}
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{{- '<|im_start|>user' }}
{%- endif %}
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{{- content }}
{{- '\n</tool_response>' }}
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{{- '<|im_end|>\n' }}
{%- endif %}
{%- endif %}
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{%- if add_generation_prompt %}
{{- '<|im_start|>assistant\n' }}
{%- if enable_thinking is defined and enable_thinking is false %}
{{- '<think>\n\n</think>\n\n' }}
{%- endif %}
{%- endif %}

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