hf-datasets

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Inspect a HuggingFace dataset in one call — status, configs/splits, schema, sample rows, parquet file listing, and detailed messages-column analysis (roles, keys, tool-calls). REQUIRED before submitting any training job to verify column format matches the training method.

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mudler

mudler/universal-ml-intern

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DatenwissenschaftlerInformatik- und Mathematikberufe·SOC 15-2051

SKILL.md

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name	hf-datasets
description	Inspect a HuggingFace dataset in one call — status, configs/splits, schema, sample rows, parquet file listing, and detailed messages-column analysis (roles, keys, tool-calls). REQUIRED before submitting any training job to verify column format matches the training method.

hf-datasets

Backed by scripts/inspect_dataset.py.

When to use

Always call this before training. Training fails with KeyError if columns don't match the method. Specifically:

SFT needs messages, text, or prompt + completion.
DPO needs prompt, chosen, rejected.
GRPO needs prompt.

Also use to:

Understand a dataset before writing data-loading code.
Check schema changes between dataset versions.
Analyze the structure of chat-format datasets (which roles are used, whether tool-calls are present).
See an example row before deciding if the dataset fits the task.

Usage

# Full inspection — auto-detects config and split
python scripts/inspect_dataset.py --dataset stanfordnlp/imdb

# Pick a specific split + more sample rows
python scripts/inspect_dataset.py --dataset HuggingFaceH4/ultrachat_200k --split train_sft --sample-rows 5

# Private / gated dataset — HF_TOKEN must be set
HF_TOKEN=hf_... python scripts/inspect_dataset.py --dataset org/gated-dataset

What you get

Output is markdown with sections:

Status — whether viewer / preview / search / filter / statistics are available.
Structure — table of configs × splits.
Schema — table of columns × types (ClassLabel values inlined if ≤5 classes).
Sample Rows — up to --sample-rows rows, long values truncated at 150 chars.
Messages Column Format (auto-included when a column named messages is present) — roles seen, which keys exist (role, content, tool_calls, tool_call_id, name, function_call), tool-call/result presence, and an example message structure.
Files (Parquet) — parquet file count + total size, grouped by config/split.

Flags

--dataset (required) — org/name format.
--config, --split — auto-detected if omitted.
--sample-rows N — default 3, cap 10.
--json — wrap output in {"ok": bool, "output": "..."}.

Environment

HF_TOKEN — only needed for private / gated datasets.

Related skills

hf-papers → find_datasets surfaces datasets linked to a paper. Pipe the top hit into this skill.
hf-repos → for deeper repo-level file access (e.g. read a custom dataset_infos.json).

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Discover ML research papers, read their contents by section, trace citations, find linked datasets/models — combining HuggingFace Papers, arXiv, and Semantic Scholar. Use whenever you need to research a method, find training recipes with published results, crawl a citation graph, or locate the datasets a paper used. This is your starting point for any literature-first workflow.

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File and git-like operations on HuggingFace repositories (model / dataset / space). Covers list / read / upload / delete of files, branches, tags, pull requests, and repo management (create / update). Use to inspect repos, ship artifacts, and propose changes via PRs.

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name	hf-datasets
description	Inspect a HuggingFace dataset in one call — status, configs/splits, schema, sample rows, parquet file listing, and detailed messages-column analysis (roles, keys, tool-calls). REQUIRED before submitting any training job to verify column format matches the training method.

hf-datasets

Backed by scripts/inspect_dataset.py.

When to use

Always call this before training. Training fails with KeyError if columns don't match the method. Specifically:

SFT needs messages, text, or prompt + completion.
DPO needs prompt, chosen, rejected.
GRPO needs prompt.

Also use to:

Understand a dataset before writing data-loading code.
Check schema changes between dataset versions.
Analyze the structure of chat-format datasets (which roles are used, whether tool-calls are present).
See an example row before deciding if the dataset fits the task.

Usage

# Full inspection — auto-detects config and split
python scripts/inspect_dataset.py --dataset stanfordnlp/imdb

# Pick a specific split + more sample rows
python scripts/inspect_dataset.py --dataset HuggingFaceH4/ultrachat_200k --split train_sft --sample-rows 5

# Private / gated dataset — HF_TOKEN must be set
HF_TOKEN=hf_... python scripts/inspect_dataset.py --dataset org/gated-dataset

What you get

Output is markdown with sections:

Status — whether viewer / preview / search / filter / statistics are available.
Structure — table of configs × splits.
Schema — table of columns × types (ClassLabel values inlined if ≤5 classes).
Sample Rows — up to --sample-rows rows, long values truncated at 150 chars.
Messages Column Format (auto-included when a column named messages is present) — roles seen, which keys exist (role, content, tool_calls, tool_call_id, name, function_call), tool-call/result presence, and an example message structure.
Files (Parquet) — parquet file count + total size, grouped by config/split.

Flags

--dataset (required) — org/name format.
--config, --split — auto-detected if omitted.
--sample-rows N — default 3, cap 10.
--json — wrap output in {"ok": bool, "output": "..."}.

Environment

HF_TOKEN — only needed for private / gated datasets.

Related skills

hf-papers → find_datasets surfaces datasets linked to a paper. Pipe the top hit into this skill.
hf-repos → for deeper repo-level file access (e.g. read a custom dataset_infos.json).