"""
**Parameters:**
(...)
`n_harmonics`: int, Number of harmonic terms for trend stack type. Note that len(n_harmonics) = len(stack_types). Note that it will only be used if a trend stack is used.
`n_polynomials`: int, Number of polynomial terms for seasonality stack type. Note that len(n_polynomials) = len(stack_types). Note that it will only be used if a seasonality stack is used.
"""
When in fact, harmonics are given to SeasonalityBasis() and polynomials to TrendBasis().
In the NBEATSx implementation, it reads on the docstrings of the model that:
When in fact, harmonics are given to
SeasonalityBasis()
and polynomials toTrendBasis()
.