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--- |
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dataset_info: |
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features: |
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- name: repo |
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dtype: string |
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- name: commit |
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dtype: string |
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- name: path |
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dtype: string |
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- name: lang |
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dtype: string |
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- name: license |
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dtype: string |
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- name: message |
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dtype: string |
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- name: old_code |
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dtype: string |
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- name: new_code |
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dtype: string |
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- name: n_added |
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dtype: int64 |
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- name: n_removed |
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dtype: int64 |
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- name: n_hunks |
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dtype: int64 |
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- name: change_kind |
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dtype: string |
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- name: udiff |
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dtype: string |
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- name: udiff-h |
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dtype: string |
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- name: udiff-l |
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dtype: string |
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- name: search-replace |
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dtype: string |
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splits: |
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- name: test |
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num_bytes: 5891980 |
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num_examples: 1000 |
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download_size: 2695508 |
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dataset_size: 5891980 |
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configs: |
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- config_name: default |
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data_files: |
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- split: test |
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path: data/test-* |
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--- |
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# Diff-XYZ |
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This is a dataset for the paper: [Diff-XYZ: A Benchmark for Evaluating Diff Understanding](https://arxiv.org/abs/2510.12487). |
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Diff-XYZ contains 1,000 real-world code edits sampled and filtered from |
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the [CommitPackFT](https://huggingface.co/datasets/bigcode/commitpackft) dataset. |
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Each example provides three components: the original file contents (`old_code`), the modified contents (`new_code`), and |
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multiple diff representations (`udiff`, `udiff-h`, `udiff-l`, and `search-replace`). |
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These formats enable evaluation of LLM capabilities on three code editing tasks: |
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- **Apply**: Given old code and diff, generate new code |
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- **Anti-Apply**: Given new code and diff, generate old code |
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- **Diff-Generation**: Given old and new code, generate the diff |
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## How it's built |
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Examples were systematically filtered from CommitPackFT to ensure high quality: |
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- **Scope**: Single-file changes only, excluding binary files, vendor directories, and generated code |
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- **Quality**: Removed trivial changes (whitespace-only) and likely test files |
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- **Size**: Required 40+ lines in at least one version of the code (old or new); excluded very large files (1000+ lines) |
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- **Sampling**: |
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- Target 50/50 split between single-hunk and multi-hunk edits (hunks counted via `@@` markers in the unified diff). |
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- Within each hunk group, stratify by change size (lines added + removed) using the 40th/80th percentiles of that |
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group, targeting ≈40% small, 40% medium, 20% large. |
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- Cap examples to ≤5 per repository per language. |
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## Dataset Statistics |
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- **Total examples:** 1,000 |
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- **Languages:** Python (200), JavaScript (200), Java (200), Kotlin (200), Rust (200) |
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**Hunks:** |
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- **1 hunk:** 500 (50.0%) |
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- **2+ hunks:** 500 (50.0%) |
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**Change size (added + removed), stratified within hunk groups:** |
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- **Small** (≤40th pct): 424 (42.4%) |
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- **Medium** (40th–80th): 388 (38.8%) |
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- **Large** (>80th): 188 (18.8%) |
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**Change type:** |
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- **Mixed** (additions + deletions): 815 (81.5%) |
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- **Add-only:** 163 (16.3%) |
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- **Delete-only:** 22 (2.2%) |
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**Repository diversity:** 891 unique repositories. |
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## Schema |
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| Field | Type | Description | |
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|------------------|--------|------------------------------------------------------------------------| |
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| `repo` | string | Repository identifier (e.g., "owner/name") | |
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| `commit` | string | Commit SHA that produced the change | |
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| `path` | string | File path relative to repo root | |
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| `lang` | string | One of: `python`, `javascript`, `java`, `kotlin`, `rust` | |
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| `license` | string | SPDX license identifier of the repo | |
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| `message` | string | Original commit message | |
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| `old_code` | string | Complete file contents before change | |
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| `new_code` | string | Complete file contents after change | |
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| `n_added` | int | # of `+` lines (excluding headers) | |
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| `n_removed` | int | # of `-` lines (excluding headers) | |
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| `n_hunks` | int | # of `@@` (hunk) sections | |
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| `change_kind` | string | `add_only`, `del_only`, or `mixed` | |
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| `udiff` | string | Standard unified diff (1-line context, numeric hunk headers) | |
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| `udiff-h` | string | Unified diff with relaxed hunk headers written as `@@ ... @@` | |
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| `udiff-l` | string | Unified diff with explicit line markers: `ADD`, `DEL`, and `CON` | |
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| `search-replace` | string | Search/replace representation: pairs of `SEARCH`/`REPLACE` edit blocks | |
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