CN114373523B - Glass hardness prediction method based on squirrel optimization algorithm and machine learning algorithm - Google Patents
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Abstract
The invention discloses a glass hardness prediction method based on a squirrel optimization algorithm and a machine learning algorithm, and relates to the field of electric digital data processing; the method comprises the following steps: constructing a hardness database of glass materials with different components; constructing a feature descriptor; providing a training set sample, and initializing parameters of a squirrel search algorithm; setting optimized parameters of a squirrel search algorithm, optimizing parameters of a Catboost algorithm by using the optimized parameters to obtain optimal parameters of the Catboost algorithm, and establishing a glass hardness prediction model; test sample data is input, and glass hardness is predicted. The method constructs a unique descriptor, uses the squirrel search optimization algorithm for optimizing the parameters of the Catboost algorithm, has a simple structure, improves the convergence speed and precision, can obviously improve the performance of the Catboost algorithm by the optimized optimal Catboost algorithm parameters, and has practical significance for improving the accuracy of predicting the glass hardness.
Description
Technical Field
The invention relates to the field of electric digital data processing, in particular to a glass hardness prediction method based on a squirrel optimization algorithm and a machine learning algorithm.
Background
Glass is an unbalanced, amorphous material that spontaneously relaxes to a supercooled liquid state. Unlike crystals, glasses do not need to meet strict stoichiometric rules and can be considered as continuous solutions of chemical elements. A large number of elements may become components constituting the glass material. Variation of 80 chemical elements in an amount of 1 mol% can resultA possible glass component. However, the only reported amounts of inorganic glasses areOn the other hand, this means that there is a great room for exploring new glass-forming ingredients having specific properties.
Hardness, as one of the most important mechanical properties, reflects the behaviour of the material against permanent deformation. The hardness of a glass material depends not only on the chemical composition but also on its network structure, and in general, a network former oxide (e.g., a network former oxide) that constructs a glass network structure,Etc.) the higher the hardness value, and the more network-modifying body oxides (such as alkali metal and alkaline earth metal oxides, etc.) having a mesh breaking effect, the lower the hardness value. The main factors affecting hardness are: the thermal history, pressure history and external factors of the glass such as temperature, humidity at the time of measurement, and the magnitude of applied load. The hardness prediction in the existing glass material design method is mainly based on a weighted sum formula of components, and the prediction method has the defect of low prediction accuracy.
Disclosure of Invention
The invention provides a glass hardness prediction method based on a squirrel search optimization algorithm and a machine learning algorithm, aiming at solving the problem that the glass hardness cannot be accurately and quickly predicted in the prior art.
The technical scheme adopted by the invention is as follows:
the glass hardness prediction method based on the squirrel optimization algorithm and the machine learning algorithm is characterized by comprising the following steps of:
step 1: acquiring hardness data of oxide glass with different components, and constructing a glass hardness database, wherein the glass hardness database comprises glass components mapped one by one and hardness corresponding to the glass components;
step 2: based on chemical characteristics, in terms of element molar contentCoulomb force between atomsShort-range interaction relation based on force field potentialA descriptor as an input parameter;
and step 3: taking the descriptor constructed in the step 2 as the input of the model, taking the hardness database constructed in the step 1 as the output of the model, constructing a training set and a testing set, and establishing a Catboost model;
and 4, step 4: introducing a squirrel search optimization algorithm, and optimizing the parameters of the selected Catboost model;
and 5: establishing a Catboost model with optimal performance based on the optimized parameters;
step 6: and (3) predicting the glass hardness of the glass component to be predicted by utilizing an optimal Catboost model.
Further, the glass hardness prediction method based on the squirrel optimization algorithm and the machine learning algorithm is characterized in that the step 2 comprises the following steps:
step 2-1: in terms of the molar content of each component constituting the glassIs a set of descriptors;
step 2-2: construction of descriptors by coulomb forces between different atoms of the components of the constituent glasses:
Wherein the content of the first and second substances,andis an ionAndthe effective ionic charge of (a) is,andare respectively a constituent elementAndeffective ionic chargeAndthe mole fraction of (a);
step 2-3: by short-range interaction of different interatomic force field potentials of various components of glassConstruction descriptor:
Wherein, the first and the second end of the pipe are connected with each other,Sis a collection of constituent elements, and is,is the mole fraction of the effective ionic charge of the constituent elements,for the Buckingham potential parameter,p= -4, -3, -2, -1, 0, 1, 2, 3, 4。
further, the glass hardness prediction method based on the squirrel optimization algorithm and the machine learning algorithm is characterized in that the step 4 comprises the following steps:
step 4-1: selecting parameters needing to be optimized by a Catboost algorithm, wherein the position coordinates of the squirrel are the parameters needing to be optimized, and defining the population scale, the dimensionality, the maximum iteration times, the sliding distance parameters and the predator existence probability of the squirrel search optimization algorithm;
step 4-2: the position of the population is initialized toSquirrel alone generated random positions, secondThe position of only squirrel can be determined by a vector; the positions of all squirrels were randomly initialized within the bounds, as follows:
wherein the content of the first and second substances,represents the firstOnly squirrel (a Chinese character of pine)The value of the dimension(s) is,、respectively the upper and lower boundaries of the variable,randis [0, 1 ]]A random number in between;
step 4-3: calculating the model accuracy of the parameters represented by the position of each squirrel according to the position of each squirrel in the step 4-2;
step 4-4: arranging their positions in ascending order according to the accuracy of flying squirrels;
and 4-5: according to the sequence of the step 4-4, sequentially distributing the flying squirrels to a hickory nut, an oak tree and a common tree, wherein the hickory nut represents the global optimal solution position, and the oak tree represents the local optimal solution position;
and 4-6: renewing squirrel position, as follows:
(1) the squirrel on the oak moves towards the pecan tree,
wherein the content of the first and second substances,is the random sliding distance of the sliding block,is [0, 1 ]]A random number within the range of the random number,is the position of the hickory tree, t represents the current iteration; sliding constantRealizes the balance between the global search and the local search, and through a large amount of analysis and demonstration,the value of (d) is set to 1.9;
(2) squirrels on ordinary trees move toward the oak,
(3) the squirrel on the common tree moves toward the hickory tree,
and 4-7: calculating the model accuracy of the parameters represented by the position of each squirrel according to the updated position of each squirrel in the steps 4-6, arranging the positions in an ascending order, and redistributing the flying squirrel to the pecan tree, the oak tree and the common tree in sequence;
and 4-8: judging whether the seasonal variation condition is satisfied, if the updating of the position of the squirrel on the common tree is satisfied, the original position is not satisfied, and the following formula is shown:
(3) randomly changing the position of squirrels on the common tree if seasonal conditions are met:
and 4-9: recalculating the accuracy of each squirrel position, arranging the positions in an ascending order, and distributing the flying squirrels to the pecan trees, the oak trees and the common trees;
step 4-10: repeating the steps 4-6 to 4-9, and finishing the optimization process when the iteration condition or the maximum iteration times is met;
and 4-11: and outputting the position and the accuracy of the squirrel on the hickory nut tree, wherein the position of the squirrel on the hickory nut tree is a Catboost parameter value.
The invention has the beneficial effects that:
(1) the invention establishes a descriptor based on chemical characteristics, considers the interrelation of ion acting force and short-range acting force among different atoms, better accords with the rule of actual glass, and has more accurate prediction result;
(2) the invention uses the squirrel search optimization algorithm to optimize the parameter optimization of the Catboost algorithm, has simple structure, improves the convergence speed and precision, can obviously improve the performance of the Catboost algorithm by the optimized optimal Catboost algorithm parameter, and has practical significance for improving the accuracy of predicting the glass hardness.
Drawings
FIG. 1 is a flow chart of an embodiment of the method of the present invention;
FIG. 2 is a flow diagram of descriptor construction according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example 1, as shown in fig. 1 and 2:
step 1: the hardness data of oxide glass with different components are collected to construct a glass hardness database, and 400 groups of hardness databases are specifically collectedThe hardness data of the glass is used for constructing a glass hardness database;
step 2: based on chemical characteristics, in terms of element molar contentInteratomic coulomb forceShort-range interaction relation based on force field potentialA descriptor as an input parameter; the method comprises the following specific steps:
Wherein the content of the first and second substances,andis an ionAndthe effective ionic charge of (a) is,andare respectively a constituent elementAndeffective ionic chargeAndthe mole fraction of (c);
step 2-3: short-range interaction relation of force field potential among Si, Na, Ca and O atomsConstruction descriptor:
Wherein the content of the first and second substances,Sis a collection of constituent elements, and is,is the mole fraction of the effective ionic charge of the constituent elements,for the Buckingham potential parameter,p= -4, -3, -2, -1, 0, 1, 2, 3, 4;
and step 3: taking the descriptor constructed in the step 2 as the input of the model, taking the hardness database constructed in the step 1 as the output of the model, constructing a training set by 320 groups of data, constructing a test set by 80 groups of data, and establishing a Catboost model;
step 4-1: selecting the number of parameter iterations, learning rate and depth of the Catboost algorithm to be optimized, establishing the position of the squirrel, and defining the population scale, dimensionality and maximum iteration number of the squirrel search optimization algorithm;
step 4-2: initializing population position, generating random position for 50 squirrels, the secondThe position of the squirrel alone can be determined by a vector. The positions of all squirrels were randomly initialized within the bounds, as follows:
wherein the content of the first and second substances,represents the firstOnly squirrel (a Chinese character of pine)The value of the dimension(s) is,、respectively the upper and lower boundaries of the variable,randis [0, 1 ]]A random number in between;
step 4-3: calculating the model accuracy of the parameters represented by the position of each squirrel according to the position of each squirrel in the step 4-2;
step 4-4: arranging their positions in ascending order according to the accuracy of flying squirrels;
and 4-5: according to the sequence of the step 4-4, sequentially distributing the flying squirrels to the pecan trees, the acorn trees and the common trees;
and 4-6: renewing squirrel position, as follows:
(1) the squirrel on the oak moves towards the pecan tree,
wherein the content of the first and second substances,is the random sliding distance of the sliding block,is [0, 1 ]]A random number within the range of the random number,is the position of the hickory tree and t represents the current iteration. Sliding constantRealizes the balance between the global search and the local search, and through a large amount of analysis and demonstration,the value of (d) is set to 1.9;
(2) squirrels on ordinary trees move toward the oak,
(3) The squirrel on the common tree moves toward the hickory tree,
And 4-7: calculating the model accuracy of the parameters represented by the position of each squirrel according to the updated position of each squirrel in the steps 4-6, arranging the positions in an ascending order, and redistributing the flying squirrel to the pecan tree, the oak tree and the common tree in sequence;
and 4-8: judging whether the seasonal variation condition is satisfied, if the updating of the position of the squirrel on the common tree is satisfied, the original position is not satisfied, and the following formula is shown:
(3) randomly changing the position of squirrels on the common tree if seasonal conditions are met:
and 4-9: recalculating the accuracy of each squirrel position, arranging the positions in an ascending order, and distributing the flying squirrels to the pecan trees, the oak trees and the common trees;
step 4-10: repeating the steps 4-6 to 4-9, and finishing the optimization process when the iteration condition or the maximum iteration times is met;
and 4-11: and outputting the position (Catboost parameter value) and accuracy of the squirrel on the hickory nut.
And 5: establishing a Catboost model with optimal performance based on the optimized parameters;
step 6: and (3) predicting the glass hardness of the glass component to be predicted by utilizing an optimal Catboost model.
Example 2, as shown in fig. 1 and 2:
step 1: the hardness data of oxide glass with different components are collected to construct a glass hardness database, and 800 groups of hardness databases are specifically collectedThe hardness data of the glass is used for constructing a glass hardness database;
step 2: based on chemical characteristics, in terms of element molar content respectivelyInter-atomic coulombsActing forceShort-range interaction relation based on force field potentialA descriptor as an input parameter; the method comprises the following specific steps:
Wherein the content of the first and second substances,andis an ionAndeffective ion ofThe charge is applied to the surface of the substrate,andare respectively a constituent elementAndeffective ionic chargeAndthe mole fraction of (c);
step 2-3: with Si, Na、Ca. Short-range interaction relationship of force field potential between O atomsConstruction descriptor:
Wherein the content of the first and second substances,Sis a collection of constituent elements, and is,is the mole fraction of the effective ionic charge of the constituent elements,for the Buckingham potential parameter,p= -4, -3, -2, -1, 0, 1, 2, 3, 4;
and 3, step 3: taking the descriptor constructed in the step 2 as the input of the model, taking the hardness database constructed in the step 1 as the output of the model, constructing a training set by using 640 groups of data, constructing a test set by using 160 groups of data, and constructing a Catboost model;
step 4-1: selecting the number of parameter iterations, learning rate and depth of the Catboost algorithm to be optimized, establishing the position of the squirrel, and defining the population scale, dimensionality and maximum iteration number of the squirrel search optimization algorithm;
step 4-2: initializing population position, generating random position for 50 squirrels, the secondiThe position of only squirrels can be determined by a vector. The positions of all squirrels were randomly initialized within the bounds, as follows:
wherein the content of the first and second substances,represents the firstOnly squirrel (a Chinese character of pine)The value of the dimension(s) is,、respectively the upper and lower boundaries of the variable,randis [0, 1 ]]A random number in between;
step 4-3: calculating the model accuracy of the parameters represented by the position of each squirrel according to the position of each squirrel in the step 4-2;
step 4-4: arranging their positions in ascending order according to the accuracy of flying squirrels;
and 4-5: according to the sequence of the step 4-4, sequentially distributing the flying squirrels to the pecan trees, the acorn trees and the common trees;
and 4-6: renewing squirrel position, as follows:
(1) the squirrel on the oak moves towards the pecan tree,
wherein the content of the first and second substances,is the random sliding distance of the sliding block,is [0, 1 ]]A random number within the range of the random number,is the position of the hickory tree,trepresenting the current iteration. Sliding constantRealizes the balance between the global search and the local search, and through a large amount of analysis and demonstration,the value of (d) is set to 1.9;
(2) squirrels on ordinary trees move toward the oak,
(3) The squirrel on the general tree moves toward the pecan tree,
And 4-7: calculating the model accuracy of the parameters represented by the position of each squirrel according to the updated position of each squirrel in the steps 4-6, arranging the positions in an ascending order, and redistributing the flying squirrel to the pecan tree, the oak tree and the common tree in sequence;
and 4-8: judging whether the seasonal variation condition is satisfied, if the updating of the position of the squirrel on the common tree is satisfied, the original position is not satisfied, and the following formula is shown:
Wherein the content of the first and second substances,tandcurrent and maximum iteration values, respectively.
(3) Randomly changing the position of squirrels on the common tree if seasonal conditions are met:
and 4-9: recalculating the accuracy of each squirrel position, arranging the positions in an ascending order, and distributing the flying squirrels to the pecan trees, the oak trees and the common trees;
step 4-10: repeating the steps 4-6 to 4-9, and finishing the optimization process when the iteration condition or the maximum iteration times is met;
and 4-11: and outputting the position (Catboost parameter value) and accuracy of the squirrel on the hickory nut.
And 5: establishing a Catboost model with optimal performance based on the optimized parameters;
step 6: and (3) predicting the glass hardness of the glass component to be predicted by utilizing an optimal Catboost model.
Example model properties are given in the following table:
table one: examples 1, 2 model Performance tables
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (2)
1. The glass hardness prediction method based on the squirrel optimization algorithm and the machine learning algorithm is characterized by comprising the following steps of:
step 1: acquiring hardness data of oxide glass with different components, and constructing a glass hardness database, wherein the glass hardness database comprises glass components mapped one by one and hardness corresponding to the glass components;
step 2: based on chemical characteristics, in terms of element molar contentCoulomb force between atomsShort-range interaction relation based on force field potentialA descriptor as an input parameter;
and step 3: taking the descriptor constructed in the step 2 as the input of the model, taking the hardness database constructed in the step 1 as the output of the model, constructing a training set and a test set, and establishing a Catboost model;
and 4, step 4: introducing a squirrel search optimization algorithm to optimize the parameters of the selected Catboost model;
and 5: establishing a Catboost model with optimal performance based on the optimized parameters;
and 6: predicting the glass hardness of the glass component by utilizing an optimal Catboost model aiming at the glass component to be predicted;
the step 2 comprises the following steps:
step 2-1: in terms of the molar content of each component constituting the glassIs a set of descriptors;
step 2-2: construction of descriptors by coulomb forces between different atoms of the components of the constituent glasses:
Wherein the content of the first and second substances,andis an ionAndthe effective ionic charge of (a) is,andare respectively a constituent elementAndeffective ionic chargeAndthe mole fraction of (c);
step 2-3: by short-range interaction of different interatomic force field potentials of various components of glassConstruction descriptor:
2. The squirrel optimization algorithm and machine learning algorithm-based glass hardness prediction method according to claim 1, wherein the step 4 comprises the steps of:
step 4-1: selecting parameters needing to be optimized by a Catboost algorithm, wherein the position coordinates of the squirrel are the parameters needing to be optimized, and defining the population scale, the dimensionality, the maximum iteration times, the sliding distance parameters and the predator existence probability of the squirrel search optimization algorithm;
step 4-2: the position of the population is initialized toRandom positions were generated by squirrels alone, secondThe position of only squirrel can be determined by a vector; the positions of all squirrels were randomly initialized within the bounds, as follows:
wherein, the first and the second end of the pipe are connected with each other,represents the firstOnly squirrel (a Chinese character of pine)The value of the dimension(s) is,、respectively the upper and lower boundaries of the variable, and rand is [0, 1 ]]A random number in between;
step 4-3: calculating the model accuracy of the parameters represented by the position of each squirrel according to the position of each squirrel in the step 4-2;
step 4-4: arranging their positions in ascending order according to the accuracy of flying squirrels;
and 4-5: according to the sequence of the step 4-4, sequentially distributing the flying squirrels to a hickory nut, an oak tree and a common tree, wherein the hickory nut represents the global optimal solution position, and the oak tree represents the local optimal solution position;
and 4-6: updating squirrel position as follows:
(1) the squirrel on the oak moves towards the pecan tree,
wherein the content of the first and second substances,is the random sliding distance of the sliding block,is [0, 1 ]]A random number within the range of the random number,is the position of the hickory tree, t represents the current iteration; sliding constantRealizes the balance between the global search and the local search, and through a large amount of analysis and demonstration,the value of (d) is set to 1.9;
(2) squirrels on ordinary trees move toward the oak,
(3) the squirrel on the common tree moves toward the hickory tree,
and 4-7: calculating the model accuracy of the parameters represented by the position of each squirrel according to the updated position of each squirrel in the steps 4-6, arranging the positions in an ascending order, and redistributing the flying squirrel to the pecan tree, the oak tree and the common tree in sequence;
and 4-8: judging whether the seasonal variation condition is satisfied, if the updating of the position of the squirrel on the common tree is satisfied, the original position is not satisfied, and the following formula is shown:
Wherein the content of the first and second substances,t andcurrent and maximum iteration values, respectively;
(3) randomly changing the position of squirrels on the common tree if seasonal conditions are met:
and 4-9: recalculating the accuracy of each squirrel position, arranging the positions in an ascending order, and distributing the flying squirrels to the pecan trees, the oak trees and the common trees;
step 4-10: repeating the steps 4-6 to 4-9, and finishing the optimization process when the iteration condition or the maximum iteration times is met;
and 4-11: and outputting the position and the accuracy of the squirrel on the hickory nut tree, wherein the position of the squirrel on the hickory nut tree is a Catboost parameter value.
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