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GradientBase
class GradientBase(grad_method='param_shift', **kwargs)
Bases: qiskit.opflow.gradients.derivative_base.DerivativeBase
Base class for first-order operator gradient.
Convert an operator expression to the first-order gradient.
Parameters
- grad_method (
Union
[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
grad_method
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