xTimeCrystal/TinyCorpus-v2

Dataset Card for MiniModel Pretraining Corpus

This dataset is a curated, tokenized pretraining mixture designed specifically for training MiniModel-series small language models. It was tokenized using the Mistral-7B-Instruct-v0.3 tokenizer (vocab size: 32,768), which is included in the MiniModel-200M-Base repository.

For training code, data loading utilities, and full reproducibility (including the training script), see the official GitHub repository:
🔗 https://github.com/xTimeCrystal/MiniModel/tree/main

Dataset Details

This corpus combines high-quality educational and general-purpose text sources, filtered and balanced to maximize learning efficiency in low-compute training regimes.

Source Data Composition

The dataset is a weighted mixture of the following sources (by token count):

• 70% openbmb/Ultra-FineWeb (English subset)
• 20% openbmb/Ultra-FineWeb (Chinese subset)
• 5% Avelina/python-edu-cleaned
• 5% HuggingFaceTB/finemath

All source datasets are publicly available and compatible with the Apache 2.0 license.

Preprocessing

• Tokenized with the Mistral-7B-Instruct-v0.3 tokenizer
• Sequences were packed using a bin-packing algorithm to minimize padding (final padding < 5%)
• Maximum sequence length: 2048 tokens
• No deduplication beyond source-level filtering

💡 Note: The tokenizer, training configuration, and data-loading pipeline are provided in the GitHub repo for full reproducibility.