randomstatsmodels 3.2.0

Lightweight univariate time-series forecasting with auto-tuned models — NumPy only.

randomstatsmodels

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Lightweight univariate time-series forecasting with auto-tuned models — NumPy only, no heavy dependencies.

19 forecasting models with a unified .fit(y) / .predict(h) API. Each Auto* wrapper grid-searches hyperparameters on a validation split and refits the best configuration on the full series.

Installation

pip install randomstatsmodels

Requires: Python 3.9+ and NumPy.

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Quick Start

from randomstatsmodels import AutoKoopman, AutoPolymath, AutoSSA
import numpy as np

rng = np.random.default_rng(42)
t = np.arange(200)
y = 10 + 0.05 * t + np.sin(2 * np.pi * t / 24) + 0.1 * rng.normal(size=t.size)

h = 12  # forecast horizon

model = AutoKoopman().fit(y)
yhat = model.predict(h)
print("Forecast:", yhat[:5])
print("Best config:", model.best_)

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Models

19 models organised by approach. Every Auto* class accepts a parameter grid, fits/evaluates candidates, and exposes .fit(y) and .predict(h).

Classical

Model	Description
AutoNaive	Baselines: last value, seasonal, drift, mean
AutoHoltWinters	Triple exponential smoothing (level + trend + seasonal)
AutoThetaAR	Theta method with AR(1) residual correction
AutoFourier	Harmonic regression with optional linear trend

Regression-Based

Model	Description
AutoNEO	Nonlinear Evolution Operator — polynomial AR features
AutoPolymath	Polynomial + Fourier basis + ridge regression
AutoLocalLinear	Weighted local regression with exponential decay
AutoPALF	Proximal Aggregation Lag Forecaster — penalised lag weighting

Decomposition / Spectral

Model	Description
AutoSSA	Singular Spectrum Analysis — SVD on trajectory matrix
AutoKoopman	Dynamic Mode Decomposition / Koopman operator via delay embedding
AutoSpectralGradient	Spectral derivative flow — extrapolates Fourier mode dynamics

Advanced / Calculus-Based

Model	Description
AutoFracDiff	Fractional calculus — Grunwald-Letnikov fractional differencing + AR
AutoGreensKernel	Integral equation — Green's function convolution kernel
AutoPDEField	Partial differential equations — advection-diffusion on time-scale field
AutoVariationalPath	Calculus of variations — Euler-Lagrange optimal path

Hybrid / Meta

Model	Description
AutoHybridForecaster	Linear (Fourier + trend + AR) + GRU residual network
AutoMELD	Multiscale embedding with Random Fourier Features + kNN
AutoRIFT	Recursive Information Flow Tensor — information-channel dynamics
AutoEnsemble	Combines multiple base forecasters with learned weights

Advanced Ensembles

Model	Description
AutoStacked	Meta-learner stacking — ridge regression on base model predictions
AutoBagged	Block-bootstrap bagging — median of models trained on resampled series
AutoDynamic	Horizon-adaptive weighting — model weights change per forecast step

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Benchmarks

All 27 models evaluated on 36 real-world time series (20% holdout), ranked by MAE. Includes 5 industry-standard statsforecast baselines for comparison.

Overall Rankings

Rank	Model	Type	Avg Rank	#1st	#Top3	Median sMAPE
1	SF_AutoARIMA	statsforecast	8.25	4	9	6.43%
2	AutoHybridForecaster	randomstatsmodels	8.28	1	8	8.92%
3	AutoPolymath	randomstatsmodels	9.08	2	9	9.54%
4	SF_AutoTBATS	statsforecast	9.39	1	7	10.71%
5	AutoNEO	randomstatsmodels	9.68	1	8	13.57%
6	AutoKoopman	randomstatsmodels	10.11	3	5	13.00%
7	SF_AutoCES	statsforecast	10.47	4	9	10.27%
8	AutoDynamic	ensemble	10.97	0	4	13.75%
9	SF_AutoETS	statsforecast	11.50	1	2	11.46%
10	AutoSSA	randomstatsmodels	11.78	2	4	10.80%
11	SF_AutoTheta	statsforecast	12.64	1	4	12.23%
12	AutoNaive	randomstatsmodels	12.67	2	3	12.56%
13	AutoKNN	randomstatsmodels	12.68	2	9	11.74%
14	AutoLocalLinear	randomstatsmodels	13.25	2	3	13.30%
15	AutoFourier	randomstatsmodels	14.03	2	4	18.93%
16	AutoGreensKernel	randomstatsmodels	14.11	3	4	17.46%
17	AutoMELD	randomstatsmodels	14.18	1	3	13.88%
18	AutoPALF	randomstatsmodels	14.97	2	2	13.89%
19	AutoThetaAR	randomstatsmodels	15.14	0	1	24.03%
20	AutoBagged	ensemble	16.08	1	4	24.07%
21	AutoPDEField	randomstatsmodels	16.50	0	2	23.29%
22	AutoSpectralGradient	randomstatsmodels	16.89	0	1	16.28%
23	AutoHoltWinters	randomstatsmodels	17.64	1	2	23.47%
24	AutoVariationalPath	randomstatsmodels	17.92	0	1	18.16%
25	AutoRIFT	randomstatsmodels	18.79	0	0	29.67%
26	AutoFracDiff	randomstatsmodels	23.36	0	0	88.03%
27	AutoStacked	ensemble	24.89	0	0	95.01%

Dataset Coverage

36 real-world datasets across 11 challenge categories:

Category	Datasets
Trend + Seasonality	AirPassengers, MilkProduction, JohnsonJohnson, AusBeer, CO2, WineSales
Pure Seasonality	Nottem, USAccDeaths, UKGas, MelbourneTemp
Trend-Dominant	Shampoo, USGDPGrowth, WorldPopulation
Cyclical	Sunspots, Lynx, SOI
Level Shift	Nile, UKDriverDeaths, LakeHuron
Volatile / Financial	GoldPrice, USIndProduction
Short Series	TornadoDeaths, WheatYield, Discoveries, USStrikes
Long Memory	NileMinLevel, GlobalTemp
Count / Intermittent	VolcanicEruptions, IntlAirline, LondonRain
Nonlinear	SingaporeHumidity, FedFundsRate, ChampagneSales
Additional	PigSlaughter, HousingStarts, WikiPageviews

Key Findings

• SF_AutoARIMA (statsforecast) edges out as #1 overall — the industry gold standard
• AutoHybridForecaster is virtually tied at #2 (8.28 vs 8.25) — linear + GRU residuals
• AutoPolymath is the best fast single model (#3) — polynomial + Fourier + ridge
• AutoKoopman (#6) — Koopman/DMD eigenvalue propagation, extremely fast
• AutoDynamic (#8) — horizon-adaptive ensemble using all 18 randomstatsmodels base models
• No single model dominates — model selection matters for your data type

Benchmarking Your Own Data

from randomstatsmodels.benchmarking.datasets import load_datasets
from randomstatsmodels.benchmarking.evaluation import evaluate_all, print_summary
from randomstatsmodels import AutoKoopman, AutoPolymath, AutoSSA

datasets = load_datasets()
results = evaluate_all([AutoKoopman, AutoPolymath, AutoSSA], datasets)
print_summary(results["summary"])

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Metrics

from randomstatsmodels.metrics import mae, mse, rmse, mape, smape

The evaluation framework also provides MASE, MSSE, and Median Absolute Error.

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License

MIT