TiRex-2

TiRex-2: xLSTM-based time series foundation model for multivariate and streaming forecasting

TiRex-2 is a recurrent xLSTM-based time series foundation model that extends the univariate TiRex to multivariate forecasting with past and future covariates, while supporting streaming inference at constant per-patch cost. The model uses a bidirectional time mixer and asymmetric grouped-attention variate mixer to handle future-known covariates without violating causality over target variables. A synthetic coupling pipeline enables scalable multivariate pretraining from univariate corpora. TiRex-2 claims state-of-the-art zero-shot performance on GIFT-Eval and fev-bench benchmarks with 38.4M–82.5M parameters depending on mode.