README.md

metadata

license: apache-2.0
language:
  - en
tags:
  - code
  - programming
  - competitive-programming
  - mathematics
  - reasoning
  - chain-of-thought
  - tool-use
size_categories:
  - 100K<n<1M
task_categories:
  - text-generation

uCoder Dataset

A high-quality, deduplicated dataset for training coding and mathematics language models.

Dataset Statistics

• Total Samples: 420,686
• Format: ChatML (messages array)
• Languages: Python, JavaScript, C++, Java, and more

Sources

This dataset merges and cleans data from:

Source	Samples	Description
ByteDance-Seed/Code-Contests-Plus	10,293	Competitive programming
open-r1/codeforces	47,558	Codeforces problems
sahil2801/CodeAlpaca-20k	15,784	General coding
nampdn-ai/tiny-codes	159,992	Educational examples
stallone/glaive-code-assistant-v3	94,732	Code assistance
AlicanKiraz0/Agentic-CoT-Coding-SFT	429	Chain-of-thought
deepmind/code_contests	12,943	AlphaCode problems

Features

• Samples with test cases: 23,236
• Samples with reasoning: 18,401

Processing Pipeline

1. Raw merge: 441,838 samples
2. Exact deduplication: 431,574 samples
3. MinHash LSH deduplication: 425,128 samples
4. Quality filtering: 420,686 samples

Usage

from datasets import load_dataset

dataset = load_dataset("uaytug/ucoder-dataset")

# Each sample has:
# - messages: List of {role, content} for ChatML format
# - language: Programming language
# - difficulty: easy/medium/hard/expert
# - source: Original dataset
# - has_tests: Whether test cases are available
# - test_cases: JSON string of test cases
# - has_reasoning: Whether chain-of-thought is included
# - quality_score: Computed quality score

License

Apache 2.0 (inherits from source datasets)

Citation

@misc{ucoder-dataset,
  title={uCoder Dataset},
  author={Umut Aytuğ Semerci},
  year={2025},
  url={https://huggingface.co/datasets/uaytug/ucoder-dataset}
}