---
base_model: ibm-granite/granite-3.1-2b-instruct
tags:
- text-generation-inference
- transformers
- granite
- trl
- grpo
- ruslanmv
license: apache-2.0
language:
- en
---

# Granite-3.1-2B-Reasoning (Fine-tuned for Logical Reasoning)

## Model Overview

This model is a fine-tuned version of **ibm-granite/granite-3.1-2b-instruct**, specifically optimized for **enhanced reasoning capabilities**. Fine-tuning has been conducted to improve its performance on logical reasoning, structured problem-solving, and complex analytical tasks.

- **Developed by:** [ruslanmv](https://huggingface.co/ruslanmv)
- **License:** Apache 2.0
- **Base Model:** [ibm-granite/granite-3.1-2b-instruct](https://huggingface.co/ibm-granite/granite-3.1-2b-instruct)
- **Fine-tuned for:** Logical reasoning, structured problem-solving, long-context tasks
- **Supported Languages:** English  

---

## Model Summary  

**Granite-3.1-2B-Reasoning** is part of IBM’s **Granite 3.1** language model series, which supports extended context lengths and strong multi-domain performance. This fine-tuned variant enhances the model's ability to process complex reasoning tasks efficiently.

### Improvements Over Base Model:
✅ Improved **reasoning** and **problem-solving** skills  
✅ Optimized for **instruction-following** and **logical deduction**  
✅ Maintains the **efficiency and robustness** of Granite-3.1  

---

## Installation & Usage  

Install the required dependencies:  

```bash
pip install torch torchvision torchaudio
pip install accelerate
pip install transformers
```

### Running the Model  

Use the following Python snippet to load and generate text with the fine-tuned model:  

```python
from transformers import AutoModelForCausalLM, AutoTokenizer, GenerationConfig
import torch

# Model and tokenizer
model_name = "ruslanmv/granite-3.1-2b-Reasoning" 
tokenizer = AutoTokenizer.from_pretrained(model_name)
model = AutoModelForCausalLM.from_pretrained(
    model_name,
    device_map='auto', # or 'cuda' if you have only one GPU
    torch_dtype=torch.float16, # Use float16 for faster and less memory intensive inference
    load_in_4bit=True # Enable 4-bit quantization for lower memory usage - requires bitsandbytes
)

# Prepare dataset
SYSTEM_PROMPT = """
Respond in the following format:
<reasoning>
...
</reasoning>
<answer>
...
</answer>
"""
text = tokenizer.apply_chat_template([
    {"role" : "system", "content" : SYSTEM_PROMPT},
    {"role" : "user", "content" : "Calculate pi."},
], tokenize = False, add_generation_prompt = True)

inputs = tokenizer(text, return_tensors="pt").to("cuda") # Move input tensor to GPU

# Sampling parameters
generation_config = GenerationConfig(
    temperature = 0.8,
    top_p = 0.95,
    max_new_tokens = 1024, # Equivalent to max_tokens in the original code, but for generation
)

# Inference
with torch.inference_mode(): # Use inference mode for faster generation
    outputs = model.generate(**inputs, generation_config=generation_config)

output = tokenizer.decode(outputs[0], skip_special_tokens=True)

# Find the start of the actual response
start_index = output.find("assistant")
if start_index != -1:
    # Remove the initial part including "assistant"
    output = output[start_index + len("assistant"):].strip()

print(output)
```

and the output is :
```
<reasoning>
Pi is an irrational number, which means it cannot be precisely calculated using finite decimal or fractional notation. It is typically represented by the Greek letter π and its approximate value is 3.14159. However, for a more precise calculation, we can use mathematical algorithms like the Leibniz formula for π or the Gregory-Leibniz series.

The Leibniz formula for π is:

π = 4 * (1 - 1/3 + 1/5 - 1/7 + 1/9 - 1/11 + 1/13 - 1/15 +...)

This series converges slowly, so many terms are needed for a good approximation. For instance, using 10 terms, the approximation would be:

π ≈ 4 * (1 - 0.3333333333333333 + 0.1111111111111111 - 0.0344827586206897 + 0.0090040875518672 - 0.0025958422650073 + 0.0006929403729561 - 0.0001866279043531 + 0.0000499753694946 - 0.0000133386323746 + 0.0000035303398593 - 0.0000009009433996)

π ≈ 3.141592653589793

This is a rough approximation of π using 10 terms. For a more precise value, you can use more terms or employ other algorithms.

</reasoning>

<answer>
π ≈ 3.141592653589793
</answer>
```

---

## Intended Use  

Granite-3.1-2B-Reasoning is designed for tasks requiring structured **reasoning**, including:  

- **Logical and analytical problem-solving**  
- **Text-based reasoning tasks**  
- **Mathematical and symbolic reasoning**  
- **Advanced instruction-following**  

---

## License & Acknowledgments  

This model is released under the **Apache 2.0** license. It is fine-tuned from IBM’s **Granite 3.1-2B-Instruct** model. Special thanks to the **IBM Granite Team** for developing the base model.  

For more details, visit the [IBM Granite Documentation](https://huggingface.co/ibm-granite).  

---

### Citation  

If you use this model in your research or applications, please cite:  

```
@misc{ruslanmv2025granite,
  title={Fine-Tuning Granite-3.1 for Advanced Reasoning},
  author={Ruslan M.V.},
  year={2025},
  url={https://huggingface.co/ruslanmv/granite-3.1-2b-Reasoning}
}
```