sktime/chronos2-onnx-int8

Chronos-2 (int8 ONNX)

int8 ONNX export of amazon/chronos-2 (Apache-2.0), quantized as: dynamic per-channel QInt8.

int8 verified within 4.7% of forecast spread of the official Chronos2Pipeline (fp32 export within 0.0001%). Unofficial export, not affiliated with or endorsed by the model authors.

Contract

input	dtype	shape	notes
context	float32	['batch', 2048]	NaN = missing; left-pad short series with NaN
group_ids	int64	['batch']	rows sharing an id are forecast jointly (multivariate); distinct ids = independent

Output quantiles: float32 ['batch', 64, 21]. Quantile levels: [0.01, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 0.99].

One forward pass. Left-pad short series with NaN (the model is missing-aware; padding is exactly equivalent to the natural-length call). Median is level index 10.

See manifest.json for the machine-readable contract and the artifact's sha256.