VCoder

VCoder is a Python-focused coding assistant fine-tuned from Qwen2.5-Coder-3B-Instruct using LoRA and Unsloth.

The model was trained on 15,000 Python instruction-response examples from the Python Code Instructions 15K dataset and optimized for Python code generation, problem solving, debugging, and algorithm implementation.

Model Details

Attribute	Value
Base Model	Qwen2.5-Coder-3B-Instruct
Fine-Tuning Method	LoRA
Framework	Unsloth
Dataset	Python Code Instructions 15K
Training Samples	15,000
GPU	NVIDIA Tesla T4
Quantized Format	GGUF Q8_0
Primary Language	Python

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Training Pipeline

Training was performed incrementally:

Stage	Samples
Stage 1	0 - 5,000
Stage 2	5,000 - 10,000
Stage 3	10,000 - 15,000

The model was trained using parameter-efficient fine-tuning (LoRA), allowing adaptation of the base model while keeping computational requirements low.

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Benchmark Results

HumanEval Comparison

The model was evaluated against the original Qwen2.5-Coder-3B-Instruct on HumanEval coding tasks.

Model	Pass@1
Base Qwen2.5-Coder-3B	61.0%
VCoder	68.0%

Improvement

+7.0% Pass@1 improvement

This demonstrates that the fine-tuned model performs better on Python coding tasks than the original base model.

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Example Usage

Python

prompt = """
### Instruction:
Write a Python function to reverse a string.

### Input:

### Response:
"""

Example Output

def reverse_string(text):
    return text[::-1]

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Supported Tasks

• Python Code Generation
• Algorithm Design
• Data Structures
• Debugging
• Code Refactoring
• Coding Interview Questions
• Competitive Programming
• Function Completion

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GGUF Usage

Compatible with:

• Ollama
• LM Studio
• llama.cpp

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Training Dataset

Dataset used:

Python Code Instructions 15K

The dataset contains instruction-response pairs focused on Python programming tasks including:

• Function generation
• Data manipulation
• Algorithms
• Debugging
• Problem solving

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Limitations

• Primarily optimized for Python.
• Benchmark performed on a subset of HumanEval tasks.
• May generate incorrect code for highly specialized domains.
• Should not be used as the sole source of production-critical code.

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Acknowledgements

• Qwen Team for Qwen2.5-Coder
• Unsloth for efficient fine-tuning
• Hugging Face
• OpenAI HumanEval Benchmark

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Citation

@misc{vcoder2026,
  title={VCoder: Python Code Generation Model},
  author={Varunesh V, Prawin R K, Sarguru N},
  year={2026},
  base_model={Qwen2.5-Coder-3B-Instruct}
}

Github : https://github.com/varunesh-v Mail : varunesh.wrk@gmail.com