HessianBase
class 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 in the Qiskit 1.0 release. For code migration guidelines, visit https://qisk.it/opflow_migration.
Parameters
- hess_method (str |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) – Optional parameters for a CircuitGradient
Raises
ValueError – If method != fin_diff and epsilon is not None.
Attributes
hess_method
Returns CircuitGradient.
Returns
CircuitGradient.
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