This message was deleted.

Welcome @Yang Guo, Hope you find NeuralForecast useful. NeuralForecast uses the cross-learning technique where the model outputs independent predictions for each time series, while model's weights are being shared and trained over panel data. The 'unique_id' feature is not used by any model directly, but through the dataloaders that feed the data 'independently' to the NeuralForecast models. Currently most NeuralForecast models operate as univariate models in the sense that they receive univariate inputs (lags/autorregresive faetures) and output univariate forecasts. But the model is shared through the entire panel dataset. The training objective is: P(Y_{i,t+1:t+h}| Y_{i,t-L:t}) Some more complex models like the ESRNN use the 'unique_id' to query series' specific embeddings.

Thank you so much for the prompt response! Just to make sure I understand properly. The training objective is essentially to learn the sequential behavior conditioned on i, instead of viewing each series as an independent sample (e.g. the sequence does not need to have the same length.) And thus, it will only uses the information from the series itself instead of the other series at previous time stamps for predictions.

That is correct

Thank you so much for the clarification!

Hi @Yang Guo. It is more similar to the second option (if I understood it correctly). I will try to explain it again: • There is only one model (and therefore set of learned parameters) for all the time series in your dataset. • The models are UNIVARIATE. They only learn to forecast time series with their own historic values. For example {x_t-Lt} >{x tt+H}, and so own. This has the consequence that forecasts are independent between time series of your dataset. • Think of models as learning functions from historic windows of a single time series (and exogenous covariates) to future values, {x_t-Lt} >{x tt+H}.

Thank you! This tutorial is super helpful. I think I was partially confused by the original learn cross learning paper, I found the notation from this survey https://arxiv.org/abs/2004.10240 to be much more clear.