---

name: data-configuration description: "Configure MMSegmentation configs, datasets, transforms, class palettes, and safe dataset layout checks." disable-model-invocation: true metadata: disco-role: operating license: Apache 2.0

Data Configuration

Use this sub-skill when an MMSegmentation task is about experiment config files, MMEngine config inspection, dataset layout preparation, dataset classes, transform pipelines, class metadata, palettes, or dataset conversion planning.

Route Here For

• Inspecting a config, expanding _base_ inheritance, checking config naming, or applying --cfg-options overrides before a run.
• Preparing semantic segmentation dataset directories, suffixes, split files, data_prefix, ann_file, and BaseSegDataset arguments.
• Choosing or editing LoadAnnotations, augmentation transforms, PackSegInputs, class subsets, palettes, ignore_index, or reduce_zero_label.
• Understanding packaged config catalogs, model-index.yml, dataset-index.yml, and native dataset converter patterns without depending on source checkout scripts.

Stay Out Of

• Launching training, validation, testing, distributed jobs, checkpoint resume, and metric interpretation; use the training/evaluation sub-skill.
• Implementing segmentors, heads, losses, backbones, registries, or custom model components; use the model customization sub-skill.
• Running inference APIs, visualization of model predictions, or deployment runtimes; use the inference sub-skill.

First Moves

1. Read references/configuration.md for config inheritance, naming, inspection, and override rules.
2. Read references/datasets-and-transforms.md for dataset layout, BaseSegDataset, transform, class, palette, and label-index contracts.
3. Read references/dataset-conversion.md before converting raw datasets; converters are dataset-specific and reference-only here.
4. Use scripts/inspect_mmseg_config.py --help and scripts/check_dataset_layout.py --help to inspect configs and validate dataset file pairing safely.
5. If behavior is surprising, check references/troubleshooting.md before editing configs or data files.

Bundled Tools

• scripts/inspect_mmseg_config.py expands an MMEngine config, applies optional --cfg-options, prints selected keys, and only writes output when --dump is explicitly provided.
• scripts/check_dataset_layout.py checks image/annotation directory existence, suffix counts, expected image-to-mask pairing, optional split files, and label-index notes without importing MMSegmentation.