| --- |
| task_categories: |
| - text-generation |
| - code-generation |
| - code-understanding |
| tags: |
| - diff-understanding |
| - benchmark |
| dataset_info: |
| features: |
| - name: repo |
| dtype: string |
| - name: commit |
| dtype: string |
| - name: path |
| dtype: string |
| - name: lang |
| dtype: string |
| - name: license |
| dtype: string |
| - name: message |
| dtype: string |
| - name: old_code |
| dtype: string |
| - name: new_code |
| dtype: string |
| - name: n_added |
| dtype: int64 |
| - name: n_removed |
| dtype: int64 |
| - name: n_hunks |
| dtype: int64 |
| - name: change_kind |
| dtype: string |
| - name: udiff |
| dtype: string |
| - name: udiff-h |
| dtype: string |
| - name: udiff-l |
| dtype: string |
| - name: search-replace |
| dtype: string |
| splits: |
| - name: test |
| num_bytes: 5581156 |
| num_examples: 1000 |
| download_size: 2585070 |
| dataset_size: 5581156 |
| configs: |
| - config_name: default |
| data_files: |
| - split: test |
| path: data/test-* |
| --- |
| |
| # Diff-XYZ |
|
|
| This is a dataset for the paper: [Diff-XYZ: A Benchmark for Evaluating Diff Understanding](https://arxiv.org/abs/2510.12487). |
|
|
| Diff-XYZ contains 1,000 real-world code edits sampled and filtered from |
| the [CommitPackFT](https://huggingface.co/datasets/bigcode/commitpackft) dataset. |
| Each example provides three components: the original file contents (`old_code`), the modified contents (`new_code`), and |
| multiple diff representations (`udiff`, `udiff-h`, `udiff-l`, and `search-replace`). |
|
|
| These formats enable evaluation of LLM capabilities on three code editing tasks: |
|
|
| - **Apply**: Given old code and diff, generate new code |
| - **Anti-Apply**: Given new code and diff, generate old code |
| - **Diff-Generation**: Given old and new code, generate the diff |
|
|
| ## How it's built |
|
|
| Examples were systematically filtered from CommitPackFT to ensure high quality: |
|
|
| - **Scope**: Single-file changes only, excluding binary files, vendor directories, and generated code |
| - **Quality**: Removed trivial changes (whitespace-only) and likely test files |
| - **Size**: Required 40+ lines in at least one version of the code (old or new); excluded very large files (1000+ lines) |
| - **Sampling**: |
| - Target 50/50 split between single-hunk and multi-hunk edits (hunks counted via `@@` markers in the unified diff). |
| - Within each hunk group, stratify by change size (lines added + removed) using the 40th/80th percentiles of that |
| group, targeting ≈40% small, 40% medium, 20% large. |
| - Cap examples to ≤5 per repository per language. |
| |
| ## Dataset Statistics |
|
|
| - **Total examples:** 1,000 |
| - **Languages:** Python (200), JavaScript (200), Java (200), Kotlin (200), Rust (200) |
|
|
| **Hunks:** |
|
|
| - **1 hunk:** 500 (50.0%) |
| - **2+ hunks:** 500 (50.0%) |
|
|
| **Change size (added + removed), stratified within hunk groups:** |
|
|
| - **Small** (≤40th pct): 424 (42.4%) |
| - **Medium** (40th–80th): 388 (38.8%) |
| - **Large** (>80th): 188 (18.8%) |
|
|
| **Change type:** |
|
|
| - **Mixed** (additions + deletions): 815 (81.5%) |
| - **Add-only:** 163 (16.3%) |
| - **Delete-only:** 22 (2.2%) |
|
|
| **Repository diversity:** 891 unique repositories. |
|
|
| ## Schema |
|
|
| | Field | Type | Description | |
| |------------------|--------|------------------------------------------------------------------------| |
| | `repo` | string | Repository identifier (e.g., "owner/name") | |
| | `commit` | string | Commit SHA that produced the change | |
| | `path` | string | File path relative to repo root | |
| | `lang` | string | One of: `python`, `javascript`, `java`, `kotlin`, `rust` | |
| | `license` | string | SPDX license identifier of the repo | |
| | `message` | string | Original commit message | |
| | `old_code` | string | Complete file contents before change | |
| | `new_code` | string | Complete file contents after change | |
| | `n_added` | int | # of `+` lines (excluding headers) | |
| | `n_removed` | int | # of `-` lines (excluding headers) | |
| | `n_hunks` | int | # of `@@` (hunk) sections | |
| | `change_kind` | string | `add_only`, `del_only`, or `mixed` | |
| | `udiff` | string | Standard unified diff (1-line context, numeric hunk headers) | |
| | `udiff-h` | string | Unified diff with relaxed hunk headers written as `@@ ... @@` | |
| | `udiff-l` | string | Unified diff with explicit line markers: `ADD`, `DEL`, and `CON` | |
| | `search-replace` | string | Search/replace representation: pairs of `SEARCH`/`REPLACE` edit blocks | |
