CN116415670A - Method for generating countermeasure sample for quantum variation line - Google Patents
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Abstract
The invention discloses a method for generating an countermeasure sample for a quantum variation line, which comprises the following steps: s1, constructing a quantum variation line model, and training the quantum variation line model completely to obtain a quantum variation line model with complete training; s2, selecting a samplexConstructing a specific quantum variation line through a quantum variation line model, and obtaining a loss function pairxGradient values of (2)vThe method comprises the steps of carrying out a first treatment on the surface of the S3, according to the loss function pairxGradient values of (2)vCalculating a disturbance, adding the disturbance toxIn the process, obtainxIs of the challenge sample of (a)x adv The method comprises the steps of carrying out a first treatment on the surface of the According to the invention, a specific quantum variation line is constructed, and the gradient value is obtained by measuring the specific quantum variation line, the quantum variation line is utilized to generate an countermeasure sample, and the quantum variation line is trained by using the countermeasure sample, so that the robustness of the model can be effectively improved.
Description
Technical Field
The invention relates to the field of quantum countermeasure machine learning, in particular to a countermeasure sample generation method aiming at a quantum variation line.
Background
Machine learning models have proven vulnerable, and in machine learning models that accomplish image recognition tasks, adding a disturbance to the data that is difficult for the naked eye to recognize, generated by an attack method, can cause the model to output errors. In practical applications such as image recognition, autopilot, industrial control, malware detection, biometric authentication, medical diagnostics, an attacker may use an attack method to make these applications incorrect, e.g. a logo recognition system of an autopilot car may incorrectly classify a parking logo with a bit of dirt as a park-forbidden logo, resulting in catastrophic accidents. Attack methods typically construct perturbations to the gradient values of a sample based on a loss function, adding the perturbations to a legitimate sample to implement an attack. At present, quantum machine learning is a research hotspot in academia, wherein a quantum variation line is a common quantum machine learning model, and can be widely applied to classification and identification tasks. Quantum machine learning models have also proven vulnerable. One effective way to improve the defensive, robust nature of quantum machine learning models is to train the model using challenge samples, which are obtained by generating perturbations from the present solution and adding to legitimate samples.
The generation of disturbance requires obtaining the gradient value of the loss function input to the model, but at present, the quantum machine learning model is only realized in a classical computer in a simulation mode, so the gradient can be calculated in the classical computer by using an automatic differential method, which brings two problems: 1. in a quantum variation line built by a real quantum computer, an automatic differential method cannot be used for acquiring a gradient to generate an countermeasure sample; 2. the automatic differentiation method is realized by a classical computer, so that the parallel advantage of a quantum computer cannot be represented, and the time complexity is high.
Disclosure of Invention
Aiming at the defects in the prior art, the method for generating the countermeasure sample for the quantum variation circuit solves the problems of insufficient robustness and higher time complexity in the prior art.
In order to achieve the aim of the invention, the invention adopts the following technical scheme: provided is an countermeasure sample generation method for a quantum variation line, including the steps of:
s1, constructing a quantum variation line model, and training the quantum variation line model completely to obtain a quantum variation line model with complete training;
s2, selecting a samplexObtaining a loss function pair of a quantum variation circuit modelxGradient values of (2)v;
S3, according to the loss function pairxGradient values of (2)vCalculating optimal disturbance coefficientWill be +.>The generated disturbance is added toxIn the process, obtainxIs of the challenge sample of (a)x adv 。
Further: the step S1 comprises the following sub-steps:
s11 and structurenA quantum circuit, as a quantum variation circuit model, in which multiple layers are arrangedROTDoor and controlXA gate for selecting one or more lines and settingMBased measurement, obtaining expectations of quantum circuitsEAnd expect the quantum circuitEAs output of the quantum variation line model;
Ethe expression of (2) is:
wherein M is a measuring operator,for the quantum state obtained after amplitude encoding of sample x, -/->Is->Left vector of (2) satisfy->,/>Is a generic term for a series of ROT gates and control-X gates, +.>As a set of parameters,is->Is the reverse of the above;
s12, selecting a data set for machine learning, obtaining corresponding quantum states after quantum amplitude encoding of data in the data set, taking quantum state data as an input sample, inputting the input sample into a quantum variation circuit model to obtain output, and optimizing a parameter set according to the outputBy means of the optimized parameter set +.>Training a quantum variation line model to obtain a quantum variation line model with complete training;
the data in the data set comprises N characteristics, which satisfyN=2 n ;
Wherein,,Nas a number of data features in the data set,nis the number of quantum wires.
Further: the output of the quantum variation line model in the step S12 is the loss function pair ROT gate and control-XThe gradient value of the gate parameter, the bias value of the gradient value is obtained by adopting a parameter displacement method, and the formula is as follows:
wherein,,as a loss function of the quantum variational circuit model,yfor entering class labels to which the sample belongs, +.>Is a parameter set->One of the parameters->The quantum state is taken, and pi is the circumference ratio.
Further: the step S2 comprises the following sub-steps:
s21, using a quantum variation line model with complete training to samplexConstructing a specific quantum circuit, and obtaining a loss function of the specific quantum circuit, wherein the loss function has the expression:
wherein the sample isx=(x1,x2,...,xN) WhereinxNIs the first sampleNA characteristic value;
s22, preparing a quantum system to obtainK i Is a value of (2);
wherein,,K i to obtain the loss function pairxGradient values of (2)vKey values of (2);
s23, according toK i Calculating the loss function pair of a specific quantum circuitxGradient values of (2)v。
Further: the step S22 includes the following sub-steps:
s2201, preparationnIndividual qubitsAnd 1 auxiliary qubit->Will benIndividual qubits->As a data register, an initial quantum system is obtainedG 0 ,G 0 The expression of (2) is:
s2202, performing Hadamard gate operation on the auxiliary quantum bit to obtain a quantum system after one Hadamard gate operationG 1 ,G 1 The expression of (2) is:
s2203 toG 1 Auxiliary qubit in (a)For control bits, the data register is used as operation bitnIndividual qubits->Is transformed into->Quantum system for obtaining one-time quantum operationG 2 ,G 2 The expression of (2) is:
s2204 toG 2 Auxiliary qubit in (a)For control bits, the data register is used as operation bitnIndividual qubits->Is transformed into->Quantum system for obtaining secondary quantum operationG 3 ,G 3 The expression of (2) is:
wherein,,x i for the samplexIs the first of (2)iA plurality of features;
s2205 pair ofG 3 Data register of (a) to be processedManipulation, get->Operated quantum systemG 4 ,G 4 The expression of (2) is:
wherein,,AandBall are intermediate variables;
s2206, selecting a measurement operatorMTo assist in qubitsFor control bits, data registers are used as operation bits, pairs ofG 4 Measuring and calculating to obtain a measured quantum systemG 5 ,G 5 The expression of (2) is:
s2207 pair ofG 5 Auxiliary qubit in (a)Performing Hadamard gate operation to obtain a quantum system after secondary Hadamard gate operationG 6 ,G 6 The expression of (2) is:
s2208, selectZBase measurementG 5 Occurs in (a)Probability of (2)P(/>) And (3) appearance->Probability of (2)P(/>),P(/>) AndP(/>) The expression of (2) is as follows:
s2209 according toP() AndP(/>) ObtainingK i Is used as a reference to the value of (a),K i the values of (2) are:
further: the expression of the gradient of the model input of the loss function of the specific quantum circuit in the step S23 is:
wherein,,the gradient input to the quantum variational circuit model for the loss function of a particular quantum circuit,(.) represents computing gradients input to the quantum variational circuit model.
Further: the step S3 comprises the following sub-steps:
s31, setting an initial value of a disturbance coefficientSum step sizedWhereindThe value of (2) is less than +.>Is a value of (2);
s32, willSubstituting disturbance, generating an countermeasure sample by using the disturbance, and testing whether a quantum variation line model is wrongly identified:
if yes, at each timeIn the way of (a) the perturbation coefficient is reduced until it is correctly identified by the quantum variational circuit model, the last wrongly identified +.>Is the optimal perturbation coefficient +.>Step S33 is performed;
if not, at each timeIn the way of (a) increasing the disturbance factor until the quantum variational circuit model incorrectly identifies it, the first incorrectly identified +.>Is the optimal perturbation coefficient +.>Step S33 is performed;
s33, sample directionxAdding the most ideal disturbance coefficientThe generated disturbance is used for acquiring an countermeasure samplex adv ,x adv The expression of (2) is:
wherein,,is the most ideal disturbance coefficient. The beneficial effects of the invention are as follows:
1. the method provided by the invention generates a reactance sample in a mode of constructing a quantum variation line to acquire gradient, and the mode is suitable for the quantum variation line constructed by a real quantum computer;
2. the method provided by the invention is realized through a quantum variation circuit, the parallel advantage of a quantum computer is reflected, the time complexity is greatly reduced, and the robustness is improved.
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Fig. 1 is a flowchart of a method for generating an countermeasure sample for a quantum variation line according to the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and all the inventions which make use of the inventive concept are protected by the spirit and scope of the present invention as defined and defined in the appended claims to those skilled in the art.
As shown in fig. 1, in one embodiment of the present invention, there is provided an countermeasure sample generating method for a quantum variation line, including the steps of:
s1, constructing a quantum variation line model, and training the quantum variation line model completely to obtain a quantum variation line model with complete training;
s2, selecting a samplexObtaining a loss function pair of a quantum variation circuit modelxGradient values of (2)v;
S3, according to the loss function pairxGradient values of (2)vCalculating optimal disturbance coefficientWill be +.>The generated disturbance is added toxIn the process, obtainxIs of the challenge sample of (a)x adv 。
In this embodiment, the step S1 includes the following sub-steps:
s11 and structurenA quantum circuit, as a quantum variation circuit model, in which multiple layers are arrangedROTDoor and controlXA gate for selecting one or more lines and settingMBased measurement, obtaining expectations of quantum circuitsEAnd expect the quantum circuitEAs output of the quantum variation line model;
Ethe expression of (2) is:
wherein M is a measuring operator,to sample x amplitudeQuantum states obtained after encoding,/->Is->Left vector of (2) satisfy->,/>Is a generic term for a series of ROT gates and control-X gates, +.>As a set of parameters,is->Is the reverse of the above;
s12, selecting a data set for machine learning, obtaining corresponding quantum states after quantum amplitude encoding of data in the data set, taking quantum state data as an input sample, inputting the input sample into a quantum variation circuit model to obtain output, and optimizing a parameter set according to the outputBy means of the optimized parameter set +.>Training a quantum variation line model to obtain a quantum variation line model with complete training;
the data in the data set comprises N characteristics, which satisfyN=2 n ;
Wherein,,Nas a number of data features in the data set,nthe number of the quantum circuits;
the output of the quantum variation line model in the step S12 is the loss function pair ROT gate and control-XThe gradient value of the gate parameter, the bias value of the gradient value is obtained by adopting a parameter displacement method, and the formula is as follows:
wherein,,as a loss function of the quantum variational circuit model,yfor entering class labels to which the sample belongs, +.>Is a parameter set->One of the parameters->The quantum state is taken, and pi is the circumference ratio.
In this embodiment, the step S2 includes the following sub-steps:
s21, using a quantum variation line model with complete training to samplexConstructing a specific quantum circuit, and obtaining a loss function of the specific quantum circuit, wherein the loss function has the expression:
wherein the sample isx=(x1,x2,...,xN) WhereinxNIs the first sampleNA characteristic value;
s22, preparing a quantum system to obtainK i Is a value of (2);
wherein,,K i to obtain the loss function pairxGradient values of (2)vKey values of (2);
the step S22 includes the following sub-steps:
s2201, preparationnIndividual qubitsAnd 1 auxiliary qubit->Will benIndividual qubits->As a data register, an initial quantum system is obtainedG 0 ,G 0 The expression of (2) is:
s2202, performing Hadamard gate operation on the auxiliary quantum bit to obtain a quantum system after one Hadamard gate operationG 1 ,G 1 The expression of (2) is:
s2203 toG 1 Auxiliary qubit in (a)For control bits, the data register is used as operation bitnIndividual qubits->Is transformed into->Quantum system for obtaining one-time quantum operationG 2 ,G 2 The expression of (2) is:
s2204 toG 2 Auxiliary qubit in (a)For control bits, data registersOperating position, willnIndividual qubits->Is transformed into->Quantum system for obtaining secondary quantum operationG 3 ,G 3 The expression of (2) is:
wherein,,x i for the samplexIs the first of (2)iA plurality of features;
s2205 pair ofG 3 Data register of (a) to be processedManipulation, get->Operated quantum systemG 4 ,G 4 The expression of (2) is:
wherein,,AandBall are intermediate variables;
s2206, selecting a measurement operatorMTo assist in qubitsFor control bits, data registers are used as operation bits, pairs ofG 4 Measuring and calculating to obtain a measured quantum systemG 5 ,G 5 The expression of (2) is:
s2207 pair ofG 5 Auxiliary qubit in (a)Performing Hadamard gate operation to obtain a quantum system after secondary Hadamard gate operationG 6 ,G 6 The expression of (2) is:
s2208, selectZBase measurementG 5 Occurs in (a)Probability of (2)P(/>) And (3) appearance->Probability of (2)P(/>),P(/>) AndP(/>) The expression of (2) is as follows:
S2209. according toP() AndP(/>) ObtainingK i Is used as a reference to the value of (a),K i the values of (2) are:
s23, according toK i Calculating the loss function pair of a specific quantum circuitxGradient values of (2)v;
The expression of the gradient of the model input of the loss function of the specific quantum circuit in the step S23 is:
wherein,,the gradient input to the quantum variational circuit model for the loss function of a particular quantum circuit,(.) represents computing gradients input to the quantum variational circuit model.
In this embodiment, the step S3 includes the following sub-steps:
s31, setting an initial value of a disturbance coefficientSum step sizedWhereindThe value of (2) is less than +.>Is a value of (2);
s32, willSubstituting disturbance, generating an countermeasure sample by using the disturbance, and testing a quantum variation circuit modelWhether a pattern is falsely identified as such:
if yes, at each timeIn the way of (a) the perturbation coefficient is reduced until it is correctly identified by the quantum variational circuit model, the last wrongly identified +.>Is the optimal perturbation coefficient +.>Step S33 is performed;
if not, at each timeIn the way of (a) increasing the disturbance factor until the quantum variational circuit model incorrectly identifies it, the first incorrectly identified +.>Is the optimal perturbation coefficient +.>Step S33 is performed;
s33, sample directionxAdding the most ideal disturbance coefficientThe generated disturbance is used for acquiring an countermeasure samplex adv ,x adv The expression of (2) is:
In the description of the present invention, it should be understood that the terms "center," "thickness," "upper," "lower," "horizontal," "top," "bottom," "inner," "outer," "radial," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be interpreted as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defined as "first," "second," "third," or the like, may explicitly or implicitly include one or more such feature.
Claims (7)
1. A method of generating an countermeasure sample for a quantum variation line, comprising the steps of:
s1, constructing a quantum variation line model, and training the quantum variation line model completely to obtain a quantum variation line model with complete training;
s2, selecting a samplexObtaining a loss function pair of a quantum variation circuit modelxGradient values of (2)v;
2. The method of generating an countermeasure sample for a quantum variation line according to claim 1, wherein the step S1 includes the sub-steps of:
s11 and structurenA quantum circuit, as a quantum variation circuit model, in which multiple layers are arrangedROTDoor and controlXA gate for selecting one or more lines and settingMBasic measurement to obtain quantum wireRoad expectationEAnd expect the quantum circuitEAs output of the quantum variation line model;
Ethe expression of (2) is:
wherein M is a measuring operator,for the quantum state obtained after amplitude encoding of sample x, -/->Is->Left vector of (2) satisfy->,/>Is a generic term for a series of ROT gates and control-X gates, +.>For parameter set, ++>Is->Is the reverse of the above;
s12, selecting a data set for machine learning, obtaining corresponding quantum states after quantum amplitude encoding of data in the data set, taking quantum state data as an input sample, inputting the input sample into a quantum variation circuit model to obtain output, and optimizing a parameter set according to the outputBy means of the optimized parameter set +.>Training a quantum variation line model to obtain a quantum variation line model with complete training;
the data in the data set comprises N characteristics, which satisfyN=2 n ;
Wherein,,Nas a number of data features in the data set,nis the number of quantum wires.
3. The method for generating an countermeasure sample for a quantum dot line according to claim 2, wherein the output of the quantum dot line model in the step S12 is a loss function pair ROT gate and controlXThe gradient value of the gate parameter, the bias value of the gradient value is obtained by adopting a parameter displacement method, and the formula is as follows:
4. A challenge sample generation method for quantum variational circuits according to claim 3, wherein said step S2 comprises the sub-steps of:
s21, using a quantum variation line model with complete training to samplexConstructing a specific quantum circuit, and obtaining a loss function of the specific quantum circuit, wherein the loss function has the expression:
wherein the sample isx=(x1,x2,...,xN) WhereinxNIs the first sampleNA characteristic value;
s22, preparing a quantum system to obtainK i Is a value of (2);
wherein,,K i to obtain the loss function pairxGradient values of (2)vKey values of (2);
s23, according toK i Calculating the loss function pair of a specific quantum circuitxGradient values of (2)v。
5. The method of generating an countermeasure sample for a quantum variation line according to claim 4, wherein the step S22 includes the sub-steps of:
s2201, preparationnIndividual qubitsAnd 1 auxiliary qubit->Will benIndividual qubits->As a data register, an initial quantum system is obtainedG 0 ,G 0 The expression of (2) is:
s2202, performing Hadamard gate operation on the auxiliary quantum bit to obtain a quantum system after one Hadamard gate operationG 1 ,G 1 The expression of (2) is:
s2203 toG 1 Auxiliary qubit in (a)For control bits, the data register is used as operation bitnIndividual qubitsIs transformed into->Quantum system for obtaining one-time quantum operationG 2 ,G 2 The expression of (2) is:
s2204 toG 2 Auxiliary qubit in (a)For control bits, the data register is used as operation bitnIndividual qubitsIs transformed into->Quantum system for obtaining secondary quantum operationG 3 ,G 3 The expression of (2) is:
wherein,,x i for the samplexIs the first of (2)iA plurality of features;
s2205 pair ofG 3 Data register of (a) to be processedManipulation, get->Operated quantum systemG 4 ,G 4 The expression of (2) is:
wherein,,AandBall are intermediate variables;
s2206, selecting a measurement operatorMTo assist in qubitsFor control bits, data registers are used as operation bits, pairs ofG 4 Measuring and calculating to obtain a measured quantum systemG 5 ,G 5 The expression of (2) is:
s2207 pair ofG 5 Auxiliary qubit in (a)Performing Hadamard gate operation to obtain a quantum system after secondary Hadamard gate operationG 6 ,G 6 The expression of (2) is:
s2208, selectZBase measurementG 5 Occurs in (a)Probability of (2)P(/>) And (3) appearance->Probability of (2)P(/>),P(/>) AndP(/>) The expression of (2) is as follows:
s2209 according toP() AndP(/>) ObtainingK i Is used as a reference to the value of (a),K i the values of (2) are:
6. the method of generating an countermeasure sample for a quantum variation line according to claim 5, wherein the expression of the gradient of the model input of the loss function of the specific quantum line in step S23 is:
7. The method of generating an countermeasure sample for a quantum variation line according to claim 6, wherein the step S3 includes the sub-steps of:
s31, setting an initial value of a disturbance coefficientSum step sizedWhereindThe value of (2) is less than +.>Is a value of (2);
s32, willSubstituting disturbance, generating an countermeasure sample by using the disturbance, and testing whether a quantum variation line model is wrongly identified:
if yes, at each timeIn the way of (a) the perturbation coefficient is reduced until it is correctly identified by the quantum variational circuit model, the last wrongly identified +.>Is the optimal perturbation coefficient +.>Step S33 is performed;
if not, at each timeIn the way of (a) increasing the disturbance factor until the quantum variational circuit model incorrectly identifies it, the first incorrectly identified +.>Is the optimal perturbation coefficient +.>Step S33 is performed;
s33, sample directionxAdding the most ideal disturbance coefficientThe generated disturbance is used for acquiring an countermeasure samplex adv ,x adv The expression of (2) is:
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