qiskit.optimization.problems.QuadraticObjective

class QuadraticObjective(quadratic_program, constant=0.0, linear=None, quadratic=None, sense=<ObjSense.MINIMIZE: 1>)

Representation of quadratic objective function of the form: constant + linear * x + x * quadratic * x.

Constructs a quadratic objective function.

Parameter

• quadratic_program (Any) – The parent quadratic program.

• constant (float) – The constant offset of the objective.

• linear (Union[ndarray, spmatrix, List[float], Dict[Union[int, str], float], None]) – The coefficients of the linear part of the objective.

• quadratic (Union[ndarray, spmatrix, List[List[float]], Dict[Tuple[Union[int, str], Union[int, str]], float], None]) – The coefficients of the quadratic part of the objective.

• sense (ObjSense) – The optimization sense of the objective.

__init__(quadratic_program, constant=0.0, linear=None, quadratic=None, sense=<ObjSense.MINIMIZE: 1>)

Constructs a quadratic objective function.

Parameter

• quadratic_program (Any) – The parent quadratic program.

• constant (float) – The constant offset of the objective.

• linear (Union[ndarray, spmatrix, List[float], Dict[Union[int, str], float], None]) – The coefficients of the linear part of the objective.

• quadratic (Union[ndarray, spmatrix, List[List[float]], Dict[Tuple[Union[int, str], Union[int, str]], float], None]) – The coefficients of the quadratic part of the objective.

• sense (ObjSense) – The optimization sense of the objective.

Methods

__init__(quadratic_program[, constant, …])	Constructs a quadratic objective function.
evaluate(x)	Evaluate the quadratic objective for given variable values.
evaluate_gradient(x)	Evaluate the gradient of the quadratic objective for given variable values.

Attributes

constant	Returns the constant part of the objective function.
linear	Returns the linear part of the objective function.
quadratic	Returns the quadratic part of the objective function.
quadratic_program	Returns the parent QuadraticProgram.
sense	Returns the sense of the objective function.

Sense

Alias von ObjSense

property constant

Returns the constant part of the objective function.

Rückgabetyp

float

Rückgabe

The constant part of the objective function.

evaluate(x)

Evaluate the quadratic objective for given variable values.

Parameter

x (Union[ndarray, List, Dict[Union[int, str], float]]) – The values of the variables to be evaluated.

Rückgabetyp

float

Rückgabe

The value of the quadratic objective given the variable values.

evaluate_gradient(x)

Evaluate the gradient of the quadratic objective for given variable values.

Parameter

x (Union[ndarray, List, Dict[Union[int, str], float]]) – The values of the variables to be evaluated.

Rückgabetyp

ndarray

Rückgabe

The value of the gradient of the quadratic objective given the variable values.

property linear

Returns the linear part of the objective function.

Rückgabetyp

LinearExpression

Rückgabe

The linear part of the objective function.

property quadratic

Returns the quadratic part of the objective function.

Rückgabetyp

QuadraticExpression

Rückgabe

The quadratic part of the objective function.

property quadratic_program

Returns the parent QuadraticProgram.

Rückgabetyp

Any

Rückgabe

The parent QuadraticProgram.

property sense

Returns the sense of the objective function.

Rückgabetyp

ObjSense

Rückgabe

The sense of the objective function.