Tao Finetune Kumo Anomaly
NVIDIAOfficialCreated by NVIDIA Corporation
- Skill
- Tool integration
- Data and AI
- Apache-2.0
- Medium risk
AutoGineer summary
Written by AutoGineer from the skill’s own files, not by the author
Kumo-Anomaly is a diffusion-based framework designed for detecting anomalies in multivariate time series. It works by reconstructing masked segments of input data and calculating the Mean Absolute Error (MAE) between the reconstruction and the original signal. The tool supports both inference on new data and fine-tuning on domain-specific normal behavior. It features adaptive thresholding (SCS or MACS) to convert reconstruction scores into binary anomaly labels and integrates with AutoML for hyperparameter optimization.
What it does
- Performs anomaly detection on multivariate time series using diffusion models.
- Fine-tunes pretrained models on custom datasets representing normal behavior.
- Applies adaptive thresholding strategies (SCS or MACS) for binary classification.
- Generates PDF reports summarizing anomaly detection findings.
- Supports hyperparameter optimization for both fine-tuning and inference parameters.
- Handles data preprocessing including PCA reduction and normalization.
When to use it
- When you need to detect anomalies in multivariate time series data.
- When you want to adapt a pretrained diffusion model to your specific domain's normal behavior.
- When you need to perform hyperparameter optimization to improve detection accuracy.
- When you require automated report generation for anomaly analysis.
Advantages
- Leverages diffusion models for robust reconstruction-based anomaly detection.
- Supports flexible thresholding strategies to suit different data characteristics.
- Provides clear paths for both inference and model fine-tuning.
- Integrates with AutoML workflows for automated parameter tuning.
- Includes built-in reporting capabilities for analysis results.
Usage examples
- “Fine-tune Kumo-Anomaly on my normal-behavior data.”
- The agent will execute the fine-tuning script using your provided CSV, training for the specified epochs and saving the resulting model checkpoints to your output directory.
- “Run Kumo-Anomaly inference on my dataset.”
- The agent will process your numeric CSV data, apply the diffusion model, and return a DataFrame with appended Anomaly labels and MAE scores.
- “Generate an anomaly detection report for my time series data.”
- The agent will run the analysis and produce a PDF report detailing the anomaly findings based on the configured threshold strategy.
- “Perform hyperparameter search for Kumo-Anomaly fine-tuning.”
- The agent will initiate an AutoML run to optimize training parameters like learning rate and batch size to minimize validation loss.
Install
Download the skill as a ZIP:
https://mp-staging.autogineer.com/agent-skills/nvidia/tao-finetune-kumo-anomaly/downloadUnzip it into the cross-client skills folder of your project:
mkdir -p .agents/skills && unzip tao-finetune-kumo-anomaly.zip -d .agents/skills
Documentation by NVIDIA Corporation
Kumo-Anomaly
Diffusion-based anomaly detection and fine-tuning for multivariate time series. The model reconstructs randomly masked segments and scores each timestep by MAE between reconstruction and original signal; adaptive thresholding (SCS or MACS) converts scores to binary labels.
Source code: https://github.com/NVIDIA/Kumo-TS Pretrained weights: https://huggingface.co/nvidia/Kumo-Anomaly
For the most up-to-date usage information, refer to the README files in the Kumo-TS repository:
Kumo-Anomaly/README.md— full SDK reference, model architecture, and API docs
Kumo-Anomaly/examples/datasets/README.md— dataset format, synthetic data generation, and CSV conventions
External dependencies
| Dependency | Purpose | Install |
|---|---|---|
| Python 3.12+ | Runtime | https://www.python.org/downloads/ |
| uv | Package + environment manager | pip install uv |
| CUDA toolkit (optional) | GPU acceleration | https://developer.nvidia.com/cuda-downloads |
| huggingface_hub | Weight download from HF | Bundled via uv sync |
Credentials
nvidia/Kumo-Anomaly is a public repo — no token required for downloading weights.
If you ever hit a 401/403 (gated access or private fork) or a 504 on first download, see the Known pitfalls section.
Quick start
git clone --branch main --single-branch https://github.com/NVIDIA/Kumo-TS Kumo-TS
cd Kumo-TS/Kumo-Anomaly
uv sync # install dependencies (one-time)
# Inference — synthetic data, auto-downloads weights from HF on first run
uv run python examples/quick_example.py
# Inference — your own CSV
uv run python examples/quick_example.py \
--model-path final_model.pth \
--config-path curriculum_medium.yaml \
--dataset-path /path/to/data.csv
# Pre-download weights only (warm the cache before going offline)
uv run python examples/quick_example.py --download-weights
# Fine-tune on your own normal-behavior data
uv run python examples/finetune_example.py \
--csv /path/to/normal_training_data.csv \
--timestamp-col timestamp \
--label-col is_anomaly \
--epochs 20 \
--output-dir artifacts/finetune_my_dataInference
Use perform_anomaly_analysis_with_diffusion in sdk/anomaly_analysis.py. It validates
input, auto-dispatches across all visible GPUs, applies adaptive thresholding (SCS or MACS),
and returns the original DataFrame with Anomaly (0/1) and MAE columns appended.
import sys, pandas as pd
sys.path.append("/path/to/Kumo-TS/Kumo-Anomaly") # clone Kumo-TS with --branch main
from sdk.anomaly_analysis import perform_anomaly_analysis_with_diffusion
df = pd.read_csv("your_data.csv")
# The API raises ValueError on non-numeric columns — drop timestamp, IDs, and labels first.
df = df.select_dtypes(include="number")
results = perform_anomaly_analysis_with_diffusion(
df=df,
threshold_strategy="scs", # "scs" (fast) or "macs" (adaptive)
model_path=None, # None → auto-download final_model.pth from HF
model_config_path=None, # None → auto-download curriculum_medium.yaml from HF
nsample=15, # diffusion samples per window; ↑ accuracy, ↑ latency
preprocess_model_dir=None, # optional preprocessing model directory
)
# results columns: Anomaly (0/1), MAE (float), plus all original columns
print(results[["Anomaly", "MAE"]].describe())Reporting (sdk_config)
perform_anomaly_analysis_with_diffusion takes an optional sdk_config keyword —
an ADDiffusionConfig, a path to a YAML file, or None for defaults. It scopes
report-generation knobs only; inference-behavior args (threshold_strategy,
nsample, model_path, model_config_path) stay as direct function arguments.
from sdk.anomaly_analysis import ADDiffusionConfig, perform_anomaly_analysis_with_diffusion
results = perform_anomaly_analysis_with_diffusion(
df=df,
threshold_strategy="scs",
sdk_config=ADDiffusionConfig(
report_path="artifacts/anomaly_report.pdf",
report_title="Anomaly Detection Report",
),
)Or pass a YAML path instead of the dataclass — load_sdk_config accepts a flat
mapping or one nested under a top-level sdk: key (so the file can carry other
sections alongside it), and rejects unknown keys:
sdk:
report_path: artifacts/anomaly_report.pdf
report_title: Anomaly Detection Reportresults = perform_anomaly_analysis_with_diffusion(
df=df,
threshold_strategy="scs",
sdk_config="sdk_config.yaml",
)ADDiffusionConfig fields: report_path (str/Path, default None — set to
enable the PDF report), timestamp_column (str, None), ground_truth_column
(str, None), report_title (str, "Kumo-Anomaly Report"), report_max_pages
(int, 10).
Inference CLI reference
| Argument | Default | Description |
|---|---|---|
--dataset-path | synthetic | CSV with numeric feature columns |
--model-path | auto-download | Path to .pth checkpoint |
--config-path | auto-download | Path to curriculum_medium.yaml |
--download-weights | — | Fetch weights from HF and exit |
--skip-download | false | Require local weights; skip HF fetch |
Fine-tuning
Fine-tune on your own data. The training CSV should contain mostly normal behavior. Validate the pretrained model on your domain before fine-tuning.
uv run python examples/finetune_example.py \
--csv /path/to/normal_data.csv \
--val-csv /path/to/val_data.csv \ # optional; otherwise --val-ratio splits --csv
--pretrained-model final_model.pth \
--epochs 20 --batch-size 16 --lr 1e-5 \
--output-dir artifacts/finetune_my_dataFine-tuning arguments
| Argument | Default | Description |
|---|---|---|
--run-config | — | JSON/YAML config file generated by AutoMLRunner ({config_path}). All fields below can be set here; explicit CLI flags override the file. |
--csv | required | Training CSV (ideally containing normal behavior). Required if not supplied via --run-config. |
--val-csv | — | Separate validation CSV |
--val-ratio | 0.3 | Validation fraction when --val-csv not used (temporal split) |
--timestamp-col | timestamp | Column to drop from features |
--label-col | — | Label column to drop |
--drop-cols | — | Comma-separated extra columns to drop |
--pretrained-model | final_model.pth | Warm-start checkpoint (auto-downloaded if missing) |
--config | curriculum_medium.yaml | Model config YAML |
--repo-id | nvidia/Kumo-Anomaly | HuggingFace repo for auto-download |
--no-download | false | Fail if pretrained weights are not local |
--epochs | 10 | Training epochs |
--batch-size | 16 | Per-GPU batch size |
--lr | 1e-5 | AdamW learning rate |
--weight-decay | 1e-6 | AdamW weight decay |
--grad-clip | 1.0 | Gradient norm clip |
--num-workers | 0 | DataLoader workers |
--seed | 42 | Random seed |
--output-dir | artifacts/finetune | Output directory |
--window-length | config (100) | Sliding window length in timesteps |
--window-stride | 1 | Step between consecutive windows |
--split | config (10) | Alternating mask segments per window |
--mask-ratio | 0.7 | Fraction of each window masked during training |
--scale-factor | config (1) | Scale multiplier after min-max normalization |
--num-gpus | all available | Number of GPUs for DDP fine-tuning; set 1 to force single-GPU |
Running inference with a fine-tuned checkpoint
results = perform_anomaly_analysis_with_diffusion(
df=df,
threshold_strategy="scs",
model_path="artifacts/finetune_my_data/best_finetuned_model.pth",
model_config_path="artifacts/finetune_my_data/finetune_config.yaml",
nsample=15,
)AutoML (HPO: hyperparameter optimization)
This skill supports AutoML for fine-tuning HPO and labeled inference HPO through tao-skill-bank:tao-run-automl with this model's skill_dir.
Read references/automl.md when the user asks for AutoML/HPO setup, tunable parameters, VirtualEnvSDK setup, config flow, window-length constraints, inference trial scripts, or AutoML result handoff details.
Data requirements
| Property | Requirement |
|---|---|
| Rows | ≥ window_length (default 100); ≥ target_dim (default 18) for PCA |
| Columns | Must be numeric — the API raises ValueError on non-numeric columns; drop timestamp, IDs, and labels before calling |
| Values | No NaN / ±Inf — fill before passing to the API |
Feature count > target_dim | PCA reduction to target_dim; needs ≥ target_dim rows |
Feature count < target_dim | Zero-padded to target_dim |
target_dim 18 is the config-file default, not a hard constant — when fine-tuning warm-starts
from a published checkpoint (--pretrained-model), the checkpoint's embedded config overrides it
(the published final_model.pth was trained at target_dim=40). Check the checkpoint's config
rather than assuming 18 when reasoning about PCA/padding behavior for warm-started fine-tuning.
timestamp,sensor_1,sensor_2,sensor_3
2024-01-01 00:00:00,0.42,1.10,-0.33
...Pass only numeric feature columns to the inference API — it raises ValueError on
non-numeric columns rather than dropping them. Use df.select_dtypes(include="number")
or drop by name before calling. Fine-tuning handles this via --timestamp-col,
--label-col, and --drop-cols CLI args.
Output structure
Inference (examples/quick_example.py):
examples/datasets/
└── kumo-anomaly-results.csv # original columns + Anomaly (0/1) + MAEFine-tuning (--output-dir artifacts/finetune_my_data):
artifacts/finetune_my_data/
├── best_finetuned_model.pth # checkpoint with lowest validation loss
├── final_finetuned_model.pth # checkpoint from last epoch
├── metrics.json # scalar for AutoML: {"val_loss": <best>}
├── epoch_metrics.json # per-epoch log: [{"epoch": N, "train_loss": …, "val_loss": …}]
└── finetune_config.yaml # config used during training (for reproducibility)Model configuration (curriculum_medium.yaml)
| Field | Default | Description |
|---|---|---|
model.target_dim | 18 | Internal feature dim; data is PCA'd/padded to this |
dataset.window_length | 100 | Sliding window size in timesteps |
dataset.split | 10 | Alternating mask segments per window |
dataset.scale_factor | 1 | Scale multiplier after min-max normalization |
diffusion.num_steps | 500 | Full diffusion steps (overridden by DPM-Solver) |
diffusion.channels | 128 | Model hidden dimension |
diffusion.layers | 6 | Transformer encoder layers |
Hardware
| Tier | Setup | Notes |
|---|---|---|
| Minimum | 1× CPU | Functional; DPM-Solver reduces steps 500 → 20 |
| Recommended | 1× NVIDIA GPU (≥8 GB VRAM) | Strongly recommended for fine-tuning |
| Multi-GPU inference | 2–8× NVIDIA GPUs | auto-dispatched by perform_anomaly_analysis_with_diffusion |
| Multi-GPU fine-tuning | 2+× NVIDIA GPUs | Auto DDP via --num-gpus (defaults to all visible GPUs) |
Known pitfalls
| Symptom | Cause | Fix |
|---|---|---|
HfHubHTTPError: 401 | Repo gated or token missing | export HUGGINGFACE_HUB_TOKEN="hf_..." or huggingface-cli login |
504 / timeout on first weight download | HF CDN throttles unauthenticated requests — public repos are still subject to this on first download | Set export HUGGINGFACE_HUB_TOKEN="$HF_TOKEN" before running; authenticated requests use a more reliable CDN path |
ValueError: No numeric columns | All columns are strings/dates | Drop non-numeric columns before calling API |
ValueError: PCA needs at least target_dim rows | Fewer rows than target_dim (18) | Provide a longer time series |
ValueError: Need at least N rows (finetune) | Split shorter than window_length | Ensure each train/val split has ≥ 100 rows |
RuntimeError: CUDA out of memory | Batch too large | Reduce --batch-size or nsample |
| All MAE scores identical | Constant-value columns | Drop zero-variance columns before calling API |
ModuleNotFoundError: sdk | Wrong working directory | cd Kumo-Anomaly/ before uv run, or add it to sys.path |
| Slow inference on CPU | Many diffusion windows | Reduce nsample to 5–10 for smoke tests |
Files
- ATTRIBUTION.mdAdded by AutoGineer945 B
- BENCHMARK.md7.0 KiB
- LICENSELicence file added by AutoGineer11.2 KiB
- SKILL.md13.3 KiB
- config/skillspector-baseline.yaml834 B
- evals/evals.json1.2 KiB
- references/automl.md11.1 KiB
- references/skill_info.yaml2.3 KiB
- references/spec_template_inference_hpo.yaml181 B
- references/spec_template_train.yaml426 B
- schemas/inference_hpo.schema.json4.0 KiB
- schemas/train.schema.json9.3 KiB
- skill-card.md4.3 KiB
- skill.oms.sig6.2 KiB
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Requirements and compatibility
Works with: Claude Code, Claude apps, OpenAI Codex, GitHub Copilot, Cursor, Gemini CLI, Kiro, OpenCode, Goose, Amp, Roo Code, JetBrains Junie, Factory Droid, Devin (ex-Windsurf), Mistral Vibe, OpenHands, Letta
“Works with” means the tool reads the open Agent Skills format; a skill written for one tool may use features others lack.
Needs: Declares allowed tools, Needs a command-line tool, Needs Python
The author says: Requires Python 3.12+ and uv. CUDA GPU recommended; CPU-only supported.
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- NVIDIA/skills · skills/tao-finetune-kumo-anomaly · commit fce3cca
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