Gradient¶

class Gradient(grad_method='param_shift', **kwargs)[source]¶

Bases: qiskit.aqua.operators.gradients.gradient_base.GradientBase

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.

Methods

`convert`	type operator `OperatorBase`
`get_gradient`	Get the gradient for the given operator w.r.t.
`gradient_wrapper`	Get a callable function which provides the respective gradient, Hessian or QFI for given parameter values.
`parameter_expression_grad`	Get the derivative of a parameter expression w.r.t.

Attributes

grad_method¶

Returns CircuitGradient.