| --- |
| tags: [code, java, pretraining, csci680] |
| language: [code, en] |
| size_categories: [100K<n<1M] |
| --- |
| # Java pre-training corpus (CSCI 680, Assignment 1) |
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| 904,080 instances mined on 2026-10-14 from 1,091 MIT-licensed Java repositories selected with SEART GitHub Search |
| (Java, MIT License, no forks, >=100 stars, >=100 commits, >=3 contributors, last commit >= 2023-01-01, >=2,000 code |
| lines). One JSON object per line: `id`, `source` (`method`, `commit` or `review`), `repo`, `text`, `tokens`. |
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| | Source | Instances | One instance is | |
| |---|---|---| |
| | method | 648,060 | a Java method or constructor with its Javadoc and inline comments; annotations dropped, whitespace collapsed | |
| | commit | 178,933 | a commit message (default branch, merges and bots excluded) | |
| | review | 77,087 | a pull-request review thread (a review comment and its replies, bots excluded) | |
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| Exact and near duplicates (MinHash LSH, Jaccard >= 0.8 on token 3-grams), non-Latin scripts and invalid UTF-8 were |
| removed, and every instance containing a validation or test input or target of the code-review fine-tuning data |
| (Tufano et al., ICSE 2022, as subsampled for the course) was removed (493 instances). Instances are 10 to 512 tokens |
| under the accompanying SentencePiece tokenizer. `heldout.jsonl` is the 1% held-out split (seed 680). |
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| The code in this corpus comes from the MIT-licensed repositories listed, with the commit SHA mined, in |
| `corpus/repos_mined.csv` of the course repository `aura-lab-wm/teaching-genai4se-2026-jtang05`; each repository's |
| MIT license and copyright notice apply to its code. Commit messages and review comments are by those projects' |
| contributors. |
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