The sspm model object, made from biomass, predictor and catch data.
datasets[list] List of sspm_dataset that define variables in the SPM model.
time[character] The column of data that represents the
temporal dimension of the dataset.
uniqueID[character] The column of datasets that is unique for
all rows of the data matrix.
boundaries[sf] Spatial boundaries (polygons).
smoothed_data[ANY (sf)] The smoothed data.
smoothed_vars[character] A vector storing the smoothed vars.
is_split[logical] Whether this object has been split into train/test sets.