Vertaile menetelmiä

	FEDformer: Taajuusparannettu hajotettu Transformer	Tilamallinnus (Kalman-suodin)
Tieteenala	Syväoppiminen	Ekonometria
Menetelmäperhe	Machine learning	Regression model
Syntyvuosi	2022	1990
Kehittäjä	Tian Zhou et al.	Harvey; Durbin & Koopman (state space treatment); Kalman filter
Tyyppi	Frequency-domain decomposed Transformer for time-series forecasting	State space time series model
Alkuperäislähde	Zhou, T., Ma, Z., Wen, Q., Wang, X., Sun, L., & Jin, R. (2022). FEDformer: Frequency enhanced decomposed transformer for long-term series forecasting. ICML.	Harvey, A. C. (1990). Forecasting, Structural Time Series Models and the Kalman Filter. Cambridge University Press.
Rinnakkaisnimet	Frequency Enhanced Decomposed Transformer, FED-Transformer, Frequency Domain Transformer, Frekans Tabanlı Ayrıştırılmış Dönüştürücü	state space, Kalman filter, unobserved components model, Durum Uzayı Modeli (State Space / Kalman Filter)
Liittyvät	3	4
Tiivistelmä	FEDformer is a Transformer-based architecture for long-term multivariate time-series forecasting, introduced by Zhou et al. at ICML 2022. Its core innovation is the combination of seasonal-trend decomposition with frequency-domain attention: instead of computing full token-to-token attention in the time domain, FEDformer projects queries, keys, and values into the frequency domain via Fourier or wavelet transforms and operates on a randomly selected subset of frequency components, achieving linear complexity while preserving global temporal structure.	A state space model is a general time series framework that describes a series through unobserved (latent) state variables linked by a measurement equation and a transition equation, with the states estimated in real time by the Kalman filter. Developed in the state space tradition of Harvey (1990) and Durbin & Koopman (2012), it nests ARIMA and exponential smoothing as special cases.