PCAExtrapolator

class PCAExtrapolator(extrapolator=None, kernel=None, window=2)

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

A wrapper extrapolator which reduces the points’ dimensionality with PCA, performs extrapolation in the transformed pca space, and inverse transforms the results before returning. A user specifies the kernel within how the PCA transformation should be done.

Constructor.

Parameters

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

• kernel (Optional[str]) – Kernel (from sklearn) that specifies how dimensionality reduction should be done for PCA. Default value is None, and switches the extrapolation to standard PCA.

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

Raises

AquaError – if kernel is not defined in sklearn module.

Methods

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