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yolo-datasets

Use when uploading, annotating, building, converting, analyzing, or debugging datasets in Ultralytics Platform or local YOLO — Platform dataset management and Smart Annotation, data.yaml, YOLO label .txt formats, COCO/DOTA/mask conversion, auto-labeling, splits, validation, and e

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価格未確認★ 28 GitHub スター登録情報の更新日 · 2026年10月7日agent-skill

概要

説明全文を読む

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Ultralytics YOLO datasets

The #1 cause of silent training failure is a malformed dataset — validate before training.

Fastest route: prepare data in Platform

Open Platform, create a dataset under Annotate, and choose its task.
Upload images, videos, ZIP/TAR archives, or NDJSON. Existing YOLO labels and COCO JSON can be imported; cloud-storage integrations can keep supported data in place.
Open an image in the fullscreen editor. Use manual tools for detect, segment, semantic, classify, pose, or OBB. Switch to Smart mode to label with SAM (detect, segment, semantic, OBB) or a compatible official/custom YOLO model (those tasks plus pose).
Review the Classes, Charts, and Errors tabs, fix the split, and create a numbered dataset version before important runs.

Platform datasets cover all seven YOLO tasks. Depth targets are imported rather than drawn in the editor. See Platform Data and the Annotation Editor.

To train on the same dataset from local code, create an API key under Settings > API Keys, set ULTRALYTICS_API_KEY, and pass the dataset's ul:// URI as data:

yolo train model=yolo26n.pt data=ul://username/datasets/dataset-slug epochs=100

Export NDJSON when you need a portable snapshot instead of live Platform access.

The `images` → `labels` mirror rule

Ultralytics finds a label file by replacing the last /images/ path segment with /labels/ and the image extension with .txt:

dataset/
├── data.yaml
├── images/train/  img001.jpg ...     ├── images/val/  ...
└── labels/train/  img001.txt ...     └── labels/val/  ...

Labels next to images in an images/ dir, or in a dir not named labels, are not found → training stops with No labels found; if only some are missing, those images train as backgrounds.
Filenames must match stems exactly (case-sensitive on Linux).
An image with no/empty label file trains as a background image. A few percent of true backgrounds reduce false positives; accidentally missing labels destroy recall.

data.yaml anatomy

path: /abs/dataset/root # prefer absolute; a relative path missing from the CWD resolves under datasets_dir
train: images/train # dir, .txt file of image paths, or list of dirs
val: images/val
test: images/test # optional
names: # 0-based, contiguous indices
  0: person
  1: helmet
# pose only:
kpt_shape: [17, 3] # [num_keypoints, dims]; dims 2 (x,y) or 3 (x,y,visibility)
flip_idx: [0, 2, 1, ...] # L/R keypoint swap map — without it, flip augs are auto-disabled
# semantic only (optional — polygon .txt labels in labels/ also work):
masks_dir: masks # per-pixel PNG mask images
# depth only (replace names above; pair depth/{train,val}/*.png or float .npy maps):
# nc: 1
# names: {0: depth}
# depth_scale: 1000 # PNG units per meter; default millimeters

Classification datasets use no yaml: folder structure is the label (dataset/train/<class>/*.jpg, dataset/val/<class>/*.jpg); train with data=path/to/dataset.
Per-task label line formats and their gotchas: read label-formats.md (this folder) whenever writing or debugging label files.

Converting from other formats — use built-ins first

from ultralytics.data.converter import convert_coco

convert_coco(labels_dir="coco/annotations/", use_segments=True, cls91to80=False)  # → segment
convert_coco(labels_dir="coco/annotations/", use_keypoints=True, cls91to80=False)  # → pose

Omit use_segments for detect labels. cls91to80=False keeps custom category IDs (as category_id - 1); leave the default True only for the official COCO 91-class IDs.

Also in ultralytics.data.converter: convert_dota_to_yolo_obb(dota_root_path) (DOTA → OBB), convert_segment_masks_to_yolo_seg(masks_dir, output_dir, classes) (index PNGs → polygons), yolo_bbox2segment(im_dir) (upgrade detect labels to segment via SAM), convert_to_multispectral(path, n_channels).

Auto-label a raw image folder (detector proposes boxes, SAM refines masks):

from ultralytics.data.annotator import auto_annotate

auto_annotate(
    data="dataset/images/train", det_model="yolo26x.pt", sam_model="sam_b.pt", output_dir="dataset/labels/train"
)

For VOC XML/CSV there is no converter — write a small script emitting the per-task line format (normalize coords, center-based boxes).

Splitting

from ultralytics.data.split import autosplit

autosplit(path="dataset/images", weights=(0.9, 0.1, 0.0))  # writes autosplit_*.txt lists

Point train:/val: at the generated .txt files. Keep frames from the same video/scene in ONE split — per-image random splits of video frames leak near-duplicates into val and inflate mAP. For classify: split_classify_dataset(source_dir, 0.8).

Validate before training (use the task-relevant steps in order)

YAML/path check (non-classification) — validates required fields, resolves configured paths, checks the requested split (default val), and may auto-download a known dataset. It does not count or parse individual images and targets:
```
from ultralytics.data.utils import check_det_dataset

check_det_dataset("data.yaml")  # detect/segment/pose/obb/semantic/depth
```
Detection-only visual spot check — this helper accepts five-column class cx cy w h rows; wrong normalization or swapped axes become visible:
```
from ultralytics.data.utils import visualize_image_annotations

visualize_image_annotations(
    "images/train/img001.jpg",
    "labels/train/img001.txt",
    label_map={0: "person", 1: "helmet"},
)
```
Do not use this helper for segment, pose, OBB, semantic, depth, or classify targets; use their task-aware trainer plots instead.
Task-loader smoke test — run one epoch with matching task/model/data; this builds the real dataset and produces task-aware training plots (detection example):
```
yolo detect train data=data.yaml model=yolo26n.pt epochs=1 fraction=0.1
# inspect runs/detect/train/train_batch0.jpg — boxes must sit on objects
```
Distribution sanity — check task-appropriate class/target balance and split leakage. For box tasks, also inspect very small boxes at train imgsz and the background-image share.

Known-good tiny datasets for pipeline smoke tests (auto-download): coco8.yaml, coco8-seg.yaml, coco8-pose.yaml, dota8.yaml, cityscapes8.yaml, depth8.yaml, imagenet10.

label-formats.md — exact per-task label line formats + symptom→cause table. Read when writing labels, converting formats, or any label-related error.

If the installed version rejects an argument or format here, trust its error message and yolo checks over this file.

ソースを見る ↗

ファイルのメタデータ

name: yolo-datasets
description: >
  Use when uploading, annotating, building, converting, analyzing, or debugging datasets in Ultralytics Platform or local YOLO — Platform dataset management and Smart Annotation, data.yaml, YOLO label .txt formats, COCO/DOTA/mask conversion, auto-labeling, splits, validation, and errors like "no labels found" or mAP near 0. Covers detect, segment, semantic, depth, classify, pose, and OBB data.

元のテキストを表示

---
name: yolo-datasets
description: >
  Use when uploading, annotating, building, converting, analyzing, or debugging datasets in Ultralytics Platform or local YOLO — Platform dataset management and Smart Annotation, data.yaml, YOLO label .txt formats, COCO/DOTA/mask conversion, auto-labeling, splits, validation, and errors like "no labels found" or mAP near 0. Covers detect, segment, semantic, depth, classify, pose, and OBB data.
---

# Ultralytics YOLO datasets

The #1 cause of silent training failure is a malformed dataset — validate before training.

## Fastest route: prepare data in Platform

1. Open [Platform](https://platform.ultralytics.com), create a dataset under **Annotate**, and choose its task.
2. Upload images, videos, ZIP/TAR archives, or NDJSON. Existing YOLO labels and COCO JSON can be imported; cloud-storage integrations can keep supported data in place.
3. Open an image in the fullscreen editor. Use manual tools for detect, segment, semantic, classify, pose, or OBB. Switch to **Smart** mode to label with SAM (detect, segment, semantic, OBB) or a compatible official/custom YOLO model (those tasks plus pose).
4. Review the **Classes**, **Charts**, and **Errors** tabs, fix the split, and create a numbered dataset version before important runs.

Platform datasets cover all seven YOLO tasks. Depth targets are imported rather than drawn in the editor. See [Platform Data](https://docs.ultralytics.com/platform/data) and the [Annotation Editor](https://docs.ultralytics.com/platform/data/annotation).

To train on the same dataset from local code, create an API key under **Settings > API Keys**, set `ULTRALYTICS_API_KEY`, and pass the dataset's `ul://` URI as `data`:

```bash
yolo train model=yolo26n.pt data=ul://username/datasets/dataset-slug epochs=100
```

Export NDJSON when you need a portable snapshot instead of live Platform access.

## The `images` → `labels` mirror rule

Ultralytics finds a label file by replacing the **last** `/images/` path segment with `/labels/` and the image extension with `.txt`:

```
dataset/
├── data.yaml
├── images/train/  img001.jpg ...     ├── images/val/  ...
└── labels/train/  img001.txt ...     └── labels/val/  ...
```

- Labels next to images in an `images/` dir, or in a dir not named `labels`, are **not found** → training stops with `No labels found`; if only some are missing, those images train as backgrounds.
- Filenames must match stems exactly (case-sensitive on Linux).
- An image with no/empty label file trains as a **background image**. A few percent of true backgrounds reduce false positives; accidentally missing labels destroy recall.

## data.yaml anatomy

```yaml
path: /abs/dataset/root # prefer absolute; a relative path missing from the CWD resolves under datasets_dir
train: images/train # dir, .txt file of image paths, or list of dirs
val: images/val
test: images/test # optional
names: # 0-based, contiguous indices
  0: person
  1: helmet
# pose only:
kpt_shape: [17, 3] # [num_keypoints, dims]; dims 2 (x,y) or 3 (x,y,visibility)
flip_idx: [0, 2, 1, ...] # L/R keypoint swap map — without it, flip augs are auto-disabled
# semantic only (optional — polygon .txt labels in labels/ also work):
masks_dir: masks # per-pixel PNG mask images
# depth only (replace names above; pair depth/{train,val}/*.png or float .npy maps):
# nc: 1
# names: {0: depth}
# depth_scale: 1000 # PNG units per meter; default millimeters
```

- Classification datasets use **no yaml**: folder structure is the label (`dataset/train/<class>/*.jpg`, `dataset/val/<class>/*.jpg`); train with `data=path/to/dataset`.
- Per-task label line formats and their gotchas: read `label-formats.md` (this folder) whenever writing or debugging label files.

## Converting from other formats — use built-ins first

```python
from ultralytics.data.converter import convert_coco

convert_coco(labels_dir="coco/annotations/", use_segments=True, cls91to80=False)  # → segment
convert_coco(labels_dir="coco/annotations/", use_keypoints=True, cls91to80=False)  # → pose
```

Omit `use_segments` for detect labels. `cls91to80=False` keeps custom category IDs (as `category_id - 1`); leave the default `True` only for the official COCO 91-class IDs.

Also in `ultralytics.data.converter`: `convert_dota_to_yolo_obb(dota_root_path)` (DOTA → OBB), `convert_segment_masks_to_yolo_seg(masks_dir, output_dir, classes)` (index PNGs → polygons), `yolo_bbox2segment(im_dir)` (upgrade detect labels to segment via SAM), `convert_to_multispectral(path, n_channels)`.

Auto-label a raw image folder (detector proposes boxes, SAM refines masks):

```python
from ultralytics.data.annotator import auto_annotate

auto_annotate(
    data="dataset/images/train", det_model="yolo26x.pt", sam_model="sam_b.pt", output_dir="dataset/labels/train"
)
```

For VOC XML/CSV there is no converter — write a small script emitting the per-task line format (normalize coords, center-based boxes).

## Splitting

```python
from ultralytics.data.split import autosplit

autosplit(path="dataset/images", weights=(0.9, 0.1, 0.0))  # writes autosplit_*.txt lists
```

Point `train:`/`val:` at the generated `.txt` files. Keep frames from the same video/scene in ONE split — per-image random splits of video frames leak near-duplicates into val and inflate mAP. For classify: `split_classify_dataset(source_dir, 0.8)`.

## Validate before training (use the task-relevant steps in order)

1. **YAML/path check (non-classification)** — validates required fields, resolves configured paths, checks the requested split (default `val`), and may auto-download a known dataset. It does not count or parse individual images and targets:

   ```python
   from ultralytics.data.utils import check_det_dataset

   check_det_dataset("data.yaml")  # detect/segment/pose/obb/semantic/depth
   ```

2. **Detection-only visual spot check** — this helper accepts five-column `class cx cy w h` rows; wrong normalization or swapped axes become visible:

   ```python
   from ultralytics.data.utils import visualize_image_annotations

   visualize_image_annotations(
       "images/train/img001.jpg",
       "labels/train/img001.txt",
       label_map={0: "person", 1: "helmet"},
   )
   ```

   Do not use this helper for segment, pose, OBB, semantic, depth, or classify targets; use their task-aware trainer plots instead.

3. **Task-loader smoke test** — run one epoch with matching task/model/data; this builds the real dataset and produces task-aware training plots (detection example):

   ```bash
   yolo detect train data=data.yaml model=yolo26n.pt epochs=1 fraction=0.1
   # inspect runs/detect/train/train_batch0.jpg — boxes must sit on objects
   ```

4. **Distribution sanity** — check task-appropriate class/target balance and split leakage. For box tasks, also inspect very small boxes at train `imgsz` and the background-image share.

Known-good tiny datasets for pipeline smoke tests (auto-download): `coco8.yaml`, `coco8-seg.yaml`, `coco8-pose.yaml`, `dota8.yaml`, `cityscapes8.yaml`, `depth8.yaml`, `imagenet10`.

## Related pages

- `label-formats.md` — exact per-task label line formats + symptom→cause table. Read when writing labels, converting formats, or any label-related error.

If the installed version rejects an argument or format here, trust its error message and `yolo checks` over this file.

ソースを確認

価格と実行コスト

Skill の入手: 価格未確認
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ライセンス: AGPL-3.0
価格未確認: 価格は未確認です。既存のソースとインストールリンクは利用できます。

無料で入手できても実行が無料とは限りません。価格は安全評価ではありません。価格情報を送る →

ソースの再確認が必要

ソースが変更されたか同期に失敗しました。インストール前に確認してください。

インストール前にレビュー: 自動インストールを避ける

ライセンス: AGPL-3.0

Dependency or permission surface needs review
Permission surface may require sandboxing
Potential broker, wallet, exchange, or real-money execution surface; sandbox and explicit approval are required
Low GitHub adoption signal
AI レビュー承認がありません
This skill may touch real-money trading, broker, wallet, or exchange operations; use only in a sandbox with explicit approval.
Quality score needs review
Permission surface needs review: secrets or environment access, shell or command execution
GitHub adoption: 28 GitHub stars
Stars/forks activity: 28 stars, 0 forks; issue activity unavailable in current metadata
Dependency/runtime risk: command execution surface, credential or environment access
Permission surface: secrets or environment access, shell or command execution

完全な監査を開く

ツール一覧はメタデータであり、互換性のテスト結果ではありません。プロンプトは提案です。

小さなタスクから始める

1ソースを読み、入力、出力、依存関係、権限を確認します。
2Agent に計画を求め、設定と費用を承認してから隔離環境でテストします。
3出力と変更ファイルを確認し、実行した結果だけを報告します。再現用にソースの版を保存します。

依存関係、API キー、外部サービスの料金をソースで確認してください。公開リポジトリでも全サービスが無料とは限りません。

出典と利用上の注意

登録済み

メタデータと審査情報は参考です。人気、ソースの発見、実行成功は別の事実です。

ソースリポジトリ: ultralytics/skills
ライセンス: AGPL-3.0
バージョン: Unknown
最終 GitHub プッシュ: 2026年10月6日
登録情報の更新日: 2026年10月7日
手順のパス: skills/yolo-datasets/SKILL.md @ acfe53ce376f

登録されたバージョンです。ソースのリリース情報を確認してください。

品質

56/100

有望

信頼

61/100

サンドボックス限定

監査

72/100

高リスク

完全な監査を開く評価レポートを見る

Dependency or permission surface needs review
Permission surface may require sandboxing
Potential broker, wallet, exchange, or real-money execution surface; sandbox and explicit approval are required
Low GitHub adoption signal
AI レビュー承認がありません
This skill may touch real-money trading, broker, wallet, or exchange operations; use only in a sandbox with explicit approval.
Quality score needs review
Permission surface needs review: secrets or environment access, shell or command execution
GitHub adoption: 28 GitHub stars
Stars/forks activity: 28 stars, 0 forks; issue activity unavailable in current metadata
Dependency/runtime risk: command execution surface, credential or environment access
Permission surface: secrets or environment access, shell or command execution

Verified installs: —
成果: —

コピーはインストールではありません。件数は成功報告に基づき、品質全体を保証しません。

Agent 接続

Registry API 経由で判断、信頼、監査、ユースケース、インストールのシグナルを提供し、UI をスクレイピングせずに Agent が順位付けできます。

Install API を開く LLM テキスト形式 Manifest を開く自動解決プラン

詳細情報

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    "warnings": [
      "Dependency or permission surface needs review",
      "Permission surface may require sandboxing",
      "Potential broker, wallet, exchange, or real-money execution surface; sandbox and explicit approval are required",
      "Low GitHub adoption signal",
      "AI review approval is missing",
      "This skill may touch real-money trading, broker, wallet, or exchange operations; use only in a sandbox with explicit approval.",
      "Quality score needs review",
      "Permission surface needs review: secrets or environment access, shell or command execution"
    ]
  },
  "safety_gate": {
    "tier": "blocked",
    "label": "Blocked for auto-install",
    "auto_install_policy": "block",
    "auto_install_allowed": false,
    "human_review_required": true,
    "blocked": true,
    "recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
  },
  "quality": {
    "score": 56,
    "label": "Promising"
  },
  "supply": {
    "track": "Research and knowledge work",
    "scenario": "RAG and knowledge",
    "maintenance": "6d since push",
    "risk": "Risky"
  },
  "alternative_skills": [],
  "do_not_use_when": [
    "teams that need a vendor-supported SLA",
    "production agents without a repository review",
    "Low GitHub adoption signal",
    "Audit risk risky exceeds max_risk=medium",
    "High-risk permission hints: Shell or command execution, Secrets or environment access",
    "Dependency or permission surface needs review",
    "Permission surface may require sandboxing",
    "Potential broker, wallet, exchange, or real-money execution surface; sandbox and explicit approval are required"
  ],
  "agent_contract": {
    "task_input": "Use yolo-datasets in an agent workflow",
    "recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first.",
    "install_policy": "block",
    "minimum_review_before_use": [
      "Trust: 69/100 Manual review",
      "Audit: 72/100 Risky",
      "Safety: 32/100 Avoid automatic install",
      "Review repository, license, install command, and permission surface before production use."
    ],
    "expected_agent_output": {
      "selected_skill": "ultralytics-yolo-datasets (yolo-datasets)",
      "install_command": "",
      "risk_summary": "Risky; Blocked for auto-install; Review before production",
      "verification_result": "Report the smallest successful task, files touched, warnings, and any missing setup."
    }
  },
  "outcome_feedback": {
    "endpoint": "https://www.openagentskill.com/api/agent/outcome",
    "method": "POST",
    "requires_resolve_event_id": true,
    "event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
    "expected_outcomes": [
      "success",
      "failed",
      "not_relevant",
      "blocked_by_risk",
      "setup_required"
    ],
    "payload_template": {
      "event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
      "skill_slug": "ultralytics-yolo-datasets",
      "task": "Use yolo-datasets in an agent workflow",
      "agent": "codex",
      "outcome": "success",
      "install_used": true,
      "risk_blocked": false,
      "setup_required": false,
      "task_success": true,
      "output_quality": 4,
      "error_type": null,
      "human_review_required": false,
      "workspace": "sandbox",
      "time_to_useful_ms": 120000,
      "notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
    }
  },
  "endpoints": {
    "web": "https://www.openagentskill.com/skills/ultralytics-yolo-datasets",
    "api": "https://www.openagentskill.com/api/agent/skills/ultralytics-yolo-datasets",
    "audit": "https://www.openagentskill.com/skills/ultralytics-yolo-datasets/audit",
    "eval": "https://www.openagentskill.com/api/agent/evals?slug=ultralytics-yolo-datasets&task=Use%20yolo-datasets%20in%20an%20agent%20workflow&max_risk=medium",
    "resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20yolo-datasets%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
    "receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20yolo-datasets%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
    "install": "https://www.openagentskill.com/api/skills/ultralytics-yolo-datasets/install",
    "manifest": "https://www.openagentskill.com/api/registry/manifest/ultralytics-yolo-datasets"
  }
}

クリエイター向け

掲載元

Registry により登録

申請可能

この掲載は公開ソースから登録されており、メンテナー申請が承認されるまで公式として表示されません。

作成者: ultralytics
ソース: ultralytics/skills
インデックス作成者: OpenAgentSkill コミュニティインデックス

帰属は公開リポジトリまたは作成者プロフィールにリンクされています。作成者は掲載を申請して所有権シグナルを更新できます。

このスキルを申請

所有者の申請

このスキル掲載を申請

この Registry により登録掲載は ultralytics に帰属していますが、まだ公式として表示されていません。申請すると、確認済み所有者シグナルが追加され、今後の公開、インストール、監査更新の信頼性が高まります。

共有キット

クリエイター被リンクキット

README にエビデンスバッジを追加

開発者がリポジトリを評価する場所で、正規掲載、現在の信頼・監査シグナル、実際の Agent-Proven エビデンスを表示します。

[![Listed on OpenAgentSkill](https://www.openagentskill.com/api/badge/ultralytics-yolo-datasets?metric=listed&label=Listed)](https://www.openagentskill.com/skills/ultralytics-yolo-datasets?ref=github&utm_source=github&utm_medium=referral&utm_campaign=creator_badge)
[![OpenAgentSkill Trust](https://www.openagentskill.com/api/badge/ultralytics-yolo-datasets?metric=trust&label=Trust)](https://www.openagentskill.com/skills/ultralytics-yolo-datasets?ref=github&utm_source=github&utm_medium=referral&utm_campaign=creator_badge)
[![OpenAgentSkill Audit](https://www.openagentskill.com/api/badge/ultralytics-yolo-datasets?metric=audit&label=Audit)](https://www.openagentskill.com/skills/ultralytics-yolo-datasets/audit)
[![Agent Proven](https://www.openagentskill.com/api/badge/ultralytics-yolo-datasets?metric=proven&label=Agent%20Proven)](https://www.openagentskill.com/skills/ultralytics-yolo-datasets?ref=github&utm_source=github&utm_medium=referral&utm_campaign=creator_badge)

バッジをプレビュー監査を開くクリエイターキット

コミュニティシグナル

このスキルが Agent ワークフローに役立つかを共有してください。集約されたフィードバックがランキングを改善します。

概要