HessianBase

qiskit.opflow.gradients.HessianBase(hess_method='param_shift', **kwargs)

Bases: DerivativeBase

Deprecated: Base class for the Hessian of an expected value.

Deprecated since version 0.24.0

The class qiskit.opflow.gradients.hessian_base.HessianBase is deprecated as of qiskit-terra 0.24.0. It will be removed no earlier than 3 months after the release date. For code migration guidelines, visit https://qisk.it/opflow_migration (opens in a new tab).

Parameters

hess_method (str (opens in a new tab) |CircuitGradient) – The method used to compute the state/probability gradient. Can be either 'param_shift' or 'lin_comb' or 'fin_diff'. Ignored for gradients w.r.t observable parameters.
kwargs (dict (opens in a new tab)) – Optional parameters for a CircuitGradient

Raises

ValueError (opens in a new tab) – If method != fin_diff and epsilon is not None.

Attributes

hess_method

Returns CircuitGradient.

Returns

CircuitGradient.

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