SieveExtrapolator

class SieveExtrapolator(extrapolator=None, window=2, filter_before=True, filter_after=True)

Bases: qiskit.chemistry.algorithms.pes_samplers.extrapolator.Extrapolator

A wrapper extrapolator which clusters the parameter values - either before extrapolation, after, or both - into two large and small clusters, and sets the small clusters’ parameters to zero.

Constructor.

Parameters

• extrapolator (Union[PolynomialExtrapolator, DifferentialExtrapolator, None]) – ‘internal’ extrapolator that performs extrapolation on variational parameters based on data window.

• window (int) – Number of previous points to use for extrapolation.

• filter_before (bool) – Keyword to perform clustering before extrapolation.

• filter_after (bool) – Keyword to perform clustering after extrapolation.

Methods

extrapolate	Extrapolate at specified point of interest given a set of variational parameters.
factory	Factory method for constructing extrapolators.