Datasets:
File size: 4,691 Bytes
fdf294b 8533a11 fdf294b 8533a11 fdf294b 8533a11 4a10987 8533a11 9426e58 881e4d4 9426e58 881e4d4 9426e58 fdf294b 8533a11 4a10987 8533a11 fdf294b 4a10987 8533a11 fdf294b 8533a11 fdf294b 4a10987 8533a11 4a10987 8533a11 4a10987 8533a11 fdf294b 4a10987 8533a11 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 | ---
license: mit
task_categories:
- text-generation
tags:
- code
- java
- refactoring
- benchmark
- software-engineering
size_categories:
- n<1K
dataset_info:
features:
- name: instance_id
dtype: string
- name: repo
dtype: string
- name: resource_tier
dtype: string
- name: repo_stars
dtype: float64
- name: repo_forks
dtype: float64
- name: language
dtype: string
- name: base_commit
dtype: string
- name: merge_commit
dtype: string
- name: refactoring_types
list: string
- name: refactoring_descriptions
list: string
- name: file_path
dtype: string
- name: source_code_before
dtype: string
- name: source_code_after
dtype: string
- name: diff
dtype: string
- name: is_pure_refactoring
dtype: bool
- name: compile_before
dtype: bool
- name: compile_after
dtype: bool
- name: tests_pass_before
dtype: bool
- name: tests_pass_after
dtype: bool
- name: FAIL_TO_PASS
list: string
- name: PASS_TO_PASS
list: string
- name: created_at
dtype: string
- name: repo_license
dtype: string
- name: lines_changed
dtype: float64
splits:
- name: test
num_bytes: 279451236
num_examples: 816
download_size: 245967508
dataset_size: 279451236
configs:
- config_name: default
data_files:
- split: test
path: data/test-*
---
# CS4570 Java Refactoring Benchmark
A benchmark of Java refactoring commits mined from GitHub repositories, split into **high-resource** and **low-resource** tiers based on repository popularity. Built for the TU Delft CS4570 ML for Software Engineering course (2026).
## Dataset split
| Tier | Repositories | Instances | Star range |
|------|-------------|-----------|------------|
| High-resource | 57 | 618 | 1000-7298 |
| Low-resource | ~60 | 198 | 13-90 |
| **Total** | | **816** | |
Use the `resource_tier` field to filter by tier. `repo_stars` and `repo_forks` are included for fine-grained popularity analysis.
## Construction
Each instance is a single-file refactoring commit that was:
1. Detected by **RefactoringMiner 3.1.3** as containing at least one Java refactoring operation
2. Verified by building the project before and after the commit using Docker (Maven/Gradle, JDK 17/21)
3. Filtered to commits where the project compiles and tests pass both before and after (pure refactorings)
High-resource repos have >=1000 stars and >=10 contributors; low-resource repos have <100 stars.
## Fields
| Field | Type | Description |
|-------|------|-------------|
| `instance_id` | string | Unique identifier |
| `repo` | string | owner/repo identifier |
| `resource_tier` | string | "high" or "low" |
| `repo_stars` | int or null | GitHub star count at collection time |
| `repo_forks` | int or null | GitHub fork count at collection time |
| `language` | string | Always "java" |
| `base_commit` | string | Parent commit SHA |
| `merge_commit` | string | Refactoring commit SHA |
| `refactoring_types` | list[str] | Refactoring type labels from RefactoringMiner |
| `refactoring_descriptions` | list[str] or null | Human-readable descriptions (HR only) |
| `file_path` | string | Java file path that was refactored |
| `source_code_before` | string | File content at base commit |
| `source_code_after` | string | File content at merge commit |
| `diff` | string | Unified diff between before and after |
| `is_pure_refactoring` | bool or null | True if only refactoring operations changed |
| `compile_before` | bool or null | Project compiled at base commit |
| `compile_after` | bool or null | Project compiled at merge commit |
| `tests_pass_before` | bool or null | All tests pass at base commit |
| `tests_pass_after` | bool or null | All tests pass at merge commit |
| `FAIL_TO_PASS` | list[str] | Tests failing before, passing after |
| `PASS_TO_PASS` | list[str] | Tests passing both before and after |
| `created_at` | string or null | Commit timestamp (ISO 8601) |
| `repo_license` | string or null | SPDX license identifier |
| `lines_changed` | int or null | Lines changed in the refactoring |
## Refactoring types
Top types across both tiers: Extract Method, Rename Method, Rename Variable, Rename Parameter, Extract Variable, Inline Variable, Change Variable Type, Add Parameter, Add Method Annotation, Rename Attribute.
66 unique refactoring types in total.
## Usage
```python
from datasets import load_dataset
ds = load_dataset("Maxros/test", split="test")
# Filter by tier
hr = ds.filter(lambda x: x["resource_tier"] == "high")
lr = ds.filter(lambda x: x["resource_tier"] == "low")
```
## Citation
```
TU Delft CS4570 -- ML for Software Engineering benchmark, 2026.
```
|