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meridian.model.transformers.KpiTransformer

Contains forward and inverse KPI transformation methods.

meridian.model.transformers.KpiTransformer(
    kpi: meridian.backend.Tensor,
    population: meridian.backend.Tensor
)

This class stores coefficients to scale KPI, first by geo and then by mean and standard deviation of KPI.

Args
`kpi`	A tensor of dimension `(n_geos, n_times)` containing the KPI data, used to compute the mean and stddev.
`population`	A tensor of dimension `(n_geos,)` containing the population of each geo, used to to compute the population scale factors.

Attributes

population_scaled_kpi

population_scaled_mean

population_scaled_stdev

forward(
    tensor: meridian.backend.Tensor
) -> meridian.backend.Tensor

Scales a given tensor using the stored coefficients.

inverse(
    tensor: meridian.backend.Tensor
) -> meridian.backend.Tensor

Scales back a given tensor using the stored coefficients.