Claude-skill-registry funsloth-check

Validate datasets for Unsloth fine-tuning. Use when the user wants to check a dataset, analyze tokens, calculate Chinchilla optimality, or prepare data for training.

install

source · Clone the upstream repo

git clone https://github.com/majiayu000/claude-skill-registry

Claude Code · Install into ~/.claude/skills/

T=$(mktemp -d) && git clone --depth=1 https://github.com/majiayu000/claude-skill-registry "$T" && mkdir -p ~/.claude/skills && cp -r "$T/skills/data/funsloth-check" ~/.claude/skills/majiayu000-claude-skill-registry-funsloth-check && rm -rf "$T"

manifest: skills/data/funsloth-check/SKILL.md

Dataset Validation for Unsloth Fine-tuning

Validate datasets before fine-tuning with Unsloth.

Quick Start

For automated validation, use the script:

python scripts/validate_dataset.py --dataset "dataset-id" --model llama-3.1-8b --lora-rank 16

Workflow

1. Get Dataset Source

Ask for: HF dataset ID (e.g.,

mlabonne/FineTome-100k

) or local path (e.g.,

./data.jsonl

)

2. Load and Detect Format

Auto-detect format from structure. See DATA_FORMATS.md for details.

Format	Detection	Key Fields
Raw	`text` only	`text`
Alpaca	`instruction` + `output`	`instruction` , `output`
ShareGPT	`conversations` array	`from` , `value`
ChatML	`messages` array	`role` , `content`

3. Validate Schema

Check required fields exist. Report issues with fix suggestions.

4. Show Samples

Display 2-3 examples for visual verification.

5. Token Analysis

Report statistics: total tokens, min/max/mean/median sequence length.

Flag concerns:

Sequences > 4096 tokens
Sequences < 10 tokens

6. Chinchilla Analysis

Ask for target model and LoRA rank, then calculate:

Chinchilla Fraction	Interpretation
< 0.5x	Dataset may be too small
0.5x - 2.0x	Good range
> 2.0x	Large dataset, may take longer

7. Recommendations

Based on analysis, suggest:

```
standardize_sharegpt()
```
for ShareGPT data
Sequence length adjustments
Learning rate for small datasets

8. Optional: HF Upload

Offer to upload local datasets to Hub.

9. Handoff

Pass context to

funsloth-train

dataset_id: "mlabonne/FineTome-100k"
format_type: "sharegpt"
total_tokens: 15000000
target_model: "llama-3.1-8b"
use_lora: true
lora_rank: 16
chinchilla_fraction: 1.2

Bundled Resources

scripts/validate_dataset.py - Automated validation script
DATA_FORMATS.md - Dataset format reference