CN110414115A - A kind of wavelet neural network tomato yield prediction technique based on genetic algorithm - Google Patents
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Abstract
The wavelet neural network tomato yield prediction technique based on genetic algorithm that the invention discloses a kind of, belongs to technical field of agricultural information.This method first chooses a certain amount of parameter as input variable, passes through the classification, processing and the screening that carry out to these parameters and optimizes training to it to using genetic algorithm, obtains suitable data population.Then the number of nodes of network input layer, hidden layer and output layer is determined, replace the excitation function of the hiding node layer of BP neural network using wavelet basis function, and it introduces shift factor and scale factor is constantly adjusted weight, by repeatedly trained and iteration, making the error of model prediction constantly reduces, it is enabled to export result constantly close to measured value, by control errors in reasonable range, the precision of prediction and function convergence performance of model are improved, provides more reliable theories integration for crop yield in prediction greenhouse.
Description
Technical field
The invention belongs to technical field of agricultural information, in particular to a kind of wavelet neural network tomato based on genetic algorithm
Production prediction method.
Background technique
Tomato is one of the main vegetables of Northern Part of China facility cultivation, the indoor tomato planting of northern area sunlight
The cultivation mode of efficient crop rotation is mostly used, the physiological property of the environmental factor in greenhouse, the nutrient content of soil and tomato is directly determined
The yield of tomato is determined.The indoor tomato yield of prediction temperature can be to determine suitable planting scheme, reasonable arrangement dose,
Irrigation volume, takes the measures such as deinsectization, weeding in time, periodically takes ventilation, heats, the measures such as light filling, is the healthy growth of tomato
It creates a favorable environment, and lays the foundation for the good quality and high output of greenhouse tomato.The research that forefathers predict tomato yield is very wide
It is general, but be mostly focused on and the indoor tomato yield of temperature is predicted using crop mechanism model or crop growth model,
The parameter being related to is relatively fewer, and calculation method has certain limitation.Using genetic algorithm in conjunction with wavelet neural network
Mode carries out the prediction of greenhouse tomato yield, can be according to historical data over the years, and passes through each in continuous correction model
Kind parametric variable improves and Optimized model, lift scheme precision of prediction make it be more applicable for the actual rings of Greenhouse in North
Border has more wide application prospect.
Summary of the invention
The present invention provides a kind of wavelet neural network tomato yield prediction technique based on genetic algorithm, can predict the north
Tomato yield in energy saving sunlight greenhouse can be determining suitable planting scheme.
A kind of wavelet neural network tomato yield prediction model based on genetic algorithm, which is characterized in that this model it is defeated
Entering variable includes following characteristics parameter: environment temperature；Ambient humidity；Irrigation volume；Nitrogenous fertilizer input amount；Phosphate fertilizer input amount；Potash fertilizer is thrown
Enter amount；CO2Concentration；Intensity of illumination；
The model is established by following steps:
An initial population X is generated at randomm×n:
N=s1×s2+s2×s3+s2+s3 (1)
Wherein: m is initial population quantity, and n is individual lengths, and individual lengths had both represented the genic value quantity of each individual,
Also the initial weight quantity an of neural network is represented；s1For input layer number；s2For node in hidden layer；s3For output layer
Number of nodes；
The output error value E that genetic algorithm passes through each individual in calculating initial populationi, fitness value fi, and according to individual
The value of fitness value is assessed, and individual of the fitness value in preset range A in initial population is selected to continue into sub- population
Optimize training:
In sub- population, i-th of individual intersect or the probability of mutation operation is pi, according to crossing-over rate pcAnd aberration rate
pmAuto-adaptive function come judge the individual whether carry out intersect or genetic manipulation:
In formula: kc、kmIt is the real number less than 1, fcFor the ideal adaptation angle value to be intersected, fmIt is suitable for the individual to be made a variation
Answer angle value, fmax、Maximum adaptation angle value and average fitness value respectively in population,For the degree of convergence of population；
The data that input variable large deviations are more than its annual mean ± 10% are rejected, using genetic algorithm to data-optimized,
Data dynamic range≤± 5% is considered as that treatment effect is preferable, will be by screening with the data after optimization processing as wavelet neural
The input data of network simultaneously carries out subsequent arithmetic；
Treated characteristic parameter will be passed through as the input of wavelet-neural network model, greenhouse tomato yield conduct
Output, wherein include the following steps:
The mother wavelet function of the model selection are as follows:
G (x)=cos (1.75x) exp (- x2/2) (7)
Mother wavelet function is subjected to scale and translation transition structure wavelet basis function:
Wherein, aj、bjThe scale factor and shift factor of respectively j-th hidden layer node；
ykFor the output of model:
Wherein, xi(i=1,2 ..., I) is the input of i-th of node of input layer, yk(j=1,2 ..., k) be output layer
The output of j-th of node；
Define error function E are as follows:
Wherein, ykFor the reality output of k-th of node of output layer, tkIt is exported for the target of k-th of node of output layer；
Adjustment to weight, scale factor, shift factor includes:
Wherein, learning rate: η (η > 0), factor of momentum: μ (0 < μ < 1).
More preferably, error amount is expressed as a percentage, then fitness value is in 0~1 range, A=fi> 0.667.
The present invention provides a kind of wavelet neural network tomato yield prediction technique based on genetic algorithm, by data into
Capable classification, processing and screening simultaneously optimize training to it using genetic algorithm, obtain suitable data population.Then it determines
The number of nodes of network input layer, hidden layer and output layer replaces BP neural network to hide swashing for node layer using wavelet basis function
Function is encouraged, and introduces shift factor and scale factor is constantly adjusted weight, by repeatedly trained and iteration, makes model
The error of prediction constantly reduces, and enables its output result constantly close to measured value, can be by control errors in reasonable range.
Detailed description of the invention
Fig. 1 is a kind of small echo of the wavelet neural network tomato yield prediction technique based on genetic algorithm provided by the invention
Neural network structure figure；
Fig. 2 is GA-WNN forecast result of model figure；
Fig. 3 is GA-WNN model error percentage curve；
Fig. 4 is WNN forecast result of model figure；
Fig. 5 is WNN model error percentage curve；
Fig. 6 is BP neural network forecast result of model；
Fig. 7 is BP neural network model error percentage curve；
Fig. 8 is a kind of process of the wavelet neural network tomato yield prediction technique based on genetic algorithm provided by the invention
Figure.
Specific embodiment
With reference to the accompanying drawing, the specific embodiment of the present invention is described in detail, it is to be understood that of the invention
Protection scope be not limited by the specific implementation.
The establishment process of tomato yield prediction model: first to data carry out classification, processing and screening and to application lose
Propagation algorithm optimizes training to it, obtains suitable data population.Then network input layer, hidden layer and output layer are determined
Number of nodes replaces BP neural network to hide the excitation function of node layer, and introduces shift factor and ruler using wavelet basis function
The degree factor is constantly adjusted weight, by repeatedly trained and iteration, reduces the error of model prediction constantly, enables its output
As a result constantly close to measured value, by control errors in reasonable range, detailed process is as shown in Figure 8.
GA-WNN algorithm specifically executes step:
This model chooses following parameter as input variable: 1. environment temperature；2. ambient humidity；3. irrigation volume；4. nitrogenous fertilizer
Input amount；5. phosphate fertilizer input amount；6. potash fertilizer input amount；7. CO2 concentration；8. intensity of illumination, using tomato yield data as the mould
The output variable of type.Firstly, optimizing processing using genetic algorithm as the preposition means of WNN algorithm to initial data, obtaining
The data of dynamic range smaller (dynamic range of data≤± 5%), will be by screening with the data after optimization as subsequent
The initial value of WNN algorithm.Then, traditional BP neural network is improved using wavelet function, by more points of wavelet function
Distinguish that the characteristic of analysis is combined with the adaptive ability of neural network, wavelet structure neural network model, and it is constantly corrected
With it is perfect, just greatly improve the precision of prediction and function convergence performance of model in this way, for prediction greenhouse in crop yield mention
For more reliable theories integration.
Specific operation process is as follows:
(1) screening and optimization processing are carried out to 8 kinds of selected parameters using genetic algorithm.Firstly, generating one at random
Initial population Xm×nProcessing is optimized to initial data, wherein m be initial population quantity (because have chosen 8 kinds of variables,
Take m=8), individual lengths n had both represented the genic value quantity of each individual, also represented the initial weight quantity an of neural network
(hidden layer number of nodes can constantly change with network training, and weight quantity also changes correspondingly, initially set 8 input layers,
5 hiding node layers, 1 output node layer, initial weight quantity are 46) and genic value in individual and neural network
Initial weight corresponds.This research encodes genic value using real coding mode, can avoid decoding process, improves
Training effectiveness.
N=s1×s2+s2×s3+s2+s3 (1)
In formula: n is individual lengths；s1For input layer number；s2For node in hidden layer；s3For output layer number of nodes.
The output error value E that genetic algorithm passes through each individual in calculating initial populationi, fitness value fi, and according to individual
The value of fitness value is assessed, and selects in initial population that larger (error amount is expressed as a percentage fitness value, then fitness value
In 0~1 range, by fiThe value of > 0.667 is considered as the preferable numerical value of fitness) individual enter sub- population continue it is excellent
Change training.
In sub- population, the selected intersection or the probability of mutation operation of carrying out of i-th of individual is pi, and according to crossing-over rate
pcWith aberration rate pmAuto-adaptive function come judge the individual whether carry out intersect or genetic manipulation, pcWith pmValue can root
According to individual fitness fiValue and change adaptive response, keep population that there is diversity always with this.
In formula: kc、kmIt is the real number less than 1, fcFor the ideal adaptation angle value to be intersected, fmIt is suitable for the individual to be made a variation
Answer angle value, fmax、Maximum adaptation angle value and average fitness value respectively in population,For the degree of convergence of population.According to
Upper genetic algorithm accordingly carries out screening and optimization processing to initial data, and rejecting deviation is larger, and (certain variable is more than its annual
Value ± 10% is accordingly to be regarded as the biggish value of deviation, and constrains its value with this bound, is defined as boundary value and carries out subsequent meter
Calculate), using genetic algorithm to data-optimized, the dynamic range of data can be made to reduce, data dynamic range≤± 5% is considered as place
Reason effect is preferable, as the input data of wavelet neural network and carries out subsequent fortune with the data after optimization processing for by screening
It calculates.
(2) it handles by upper step with 8 kinds of characteristic parameters after optimization as the defeated of wavelet neural network (WNN) model
Enter, for greenhouse tomato yield as output, the structure of network is most important for the precision of prediction of model, stability.Construct model
When first have to consider the structure of model, can meet test requirements document, guarantee model stability and reliability, then application misses
Difference function analysis there are the problem of, continue Optimized model, promoted precision of prediction.
The mother wavelet function of the model selection are as follows:
G (x)=cos (1.75x) exp (- x2/2) (7)
Mother wavelet function is subjected to scale and translation transition structure wavelet basis function:
Wherein, aj、bjThe scale factor and shift factor of respectively j-th hidden layer node.ykFor the output of model:
xiThe input of (i=1,2 ..., I) i-th of node of-input layer, yk(j=1,2 ..., k)-j-th of output layer section
The output of point.
By being constantly adjusted to the weight in this model, scale factor, shift factor, the stability of lift scheme and
Precision of prediction enables this model be more applicable for actual site environment, and constantly improve and optimize the model.Define error letter
Number E are as follows:
Wherein, ykFor the reality output of k-th of node of output layer, tkIt is exported for the target of k-th of node of output layer.To power
The adjustment of value, scale factor, shift factor includes:
Wherein, learning rate: η (η > 0), factor of momentum: μ (0 < μ < 1).By constantly being adjusted to the parameter in formula
It is whole, thus the precision of prediction of lift scheme, and emulated using MATLAB software, verify the prediction effect of model.
Then by the parameters such as GA parameter, BP parameter, weight, scale factor, shift factor in this model constantly into
Row adjustment, the stability and precision of prediction of lift scheme enable this model be more applicable for actual site environment, and constantly complete
It is apt to and optimizes the model.
The data that this test is selected 2010~2015 years are trained model, examine using 2016~2018 years data
Test the forecast result of GA-WNN model.This network is trained using 6 years data, the continuous weight for adjusting model,
The model parameters such as scale factor, shift factor, learning rate, momentum factor and the number of iterations, simultaneously by multiple comparison test result
Error is calculated, constantly makes improvements and optimizes, obtained the preferable model of prediction effect, and its error is in reasonable model
In enclosing (percentage error is within 5%), predicted value differs very little with measured value, realizes precisely to greenhouse tomato yield substantially
Prediction, the prediction effect of the GA-WNN model such as following figure.The result shows that this model predication value is preferable to the tracking effect of measured value,
And greenhouse tomato yield can be effectively predicted in the high stability of model.Experimental data and comparison of test results table are as follows:
In order to verify the prediction effect of model, GA-WNN model and WNN model, BP neural network model are compared,
Prediction effect comparative situation see the table below.Through analysis it is found that predicted value and actual value using two kinds of models have certain error,
GA-WNN model average relative error is that 0.66%, WNN model average relative error is 1.02%, and BP neural network model is put down
Equal relative error is that 2.42%, GA-WNN forecast result of model is ideal.GA-WNN model convergence rate is better than WNN and BP mind
Through network model, had reached by 208 step prediction effects optimal.In conclusion by by genetic algorithm, wavelet analysis and BP
The convergence rate that neural network is combined the GA-WNN model constructed is very fast, precision of prediction is higher, realizes tomato yield
Accurate prediction, can for the indoor crop species of reasonable arrangement temperature, formulate irrigate and fertilising etc. governing plans foundation be provided.
This research and utilization GA-WNN model predicts the tomato yield in Greenhouse in North, has comprehensively considered influence
The factor of greenhouse tomato yield is handled and is screened to parameter using means such as genetic algorithms, and the feature of data is then extracted
Vector constructs greenhouse tomato Production Forecast Models as mode input, and utilizes the wavelet neural network mesoscale factor and translation
The factor carries out weighed value adjusting, the precision of prediction of lift scheme.Simulation result shows that GA-WNN model average relative error is
0.66%, WNN model average relative error are 1.02%, and the average relative error of BP neural network model is 2.42%, GA-
WNN forecast result of model is better than WNN and BP neural network model, has reached by 208 step prediction effects optimal, it was demonstrated that GA-
WNN model has preferable practical application value.Compared with traditional WNN and BP neural network model, GA-WNN model is put down
Relative error is smaller, precision is higher, stability is stronger, more meets greenhouse tomato production forecast, can be tomato species in greenhouse
The formulation for planting decision provides foundation, and provides measures such as irrigation, fertilising, light filling and the ventilations taken during tomato planting
Certain theories integration, and facilitation is played to the improvement and optimization of Greenhouse System.
Disclosed above is only several specific embodiments of the invention, and still, the embodiment of the present invention is not limited to this, is appointed
What what those skilled in the art can think variation should all fall into protection scope of the present invention.
Claims (2)
1. a kind of wavelet neural network tomato yield prediction model based on genetic algorithm, which is characterized in that the input of this model
Variable includes following characteristics parameter: environment temperature；Ambient humidity；Irrigation volume；Nitrogenous fertilizer input amount；Phosphate fertilizer input amount；Potash fertilizer investment
Amount；CO2Concentration；Intensity of illumination；
The model is established by following steps:
An initial population X is generated at randomm×n:
N=s1×s2+s2×s3+s2+s3 (1)
Wherein: m is initial population quantity, and n is individual lengths, and individual lengths had both represented the genic value quantity of each individual, also generation
The initial weight quantity of one neural network of table；s1For input layer number；s2For node in hidden layer；s3To export node layer
Number；
The output error value E that genetic algorithm passes through each individual in calculating initial populationi, fitness value fi, and according to ideal adaptation
The value of angle value is assessed, and individual of the fitness value in preset range A in initial population is selected to continue into sub- population
Optimization training:
In sub- population, i-th of individual intersect or the probability of mutation operation is pi, according to crossing-over rate pcWith aberration rate pmFrom
Fitness function come judge the individual whether carry out intersect or genetic manipulation:
In formula: kc、kmIt is the real number less than 1, fcFor the ideal adaptation angle value to be intersected, fmFor the individual adaptation degree to be made a variation
Value, fmax、Maximum adaptation angle value and average fitness value respectively in population,For the degree of convergence of population；
The data that input variable large deviations are more than its annual mean ± 10% are rejected, using genetic algorithm to data-optimized, data
Dynamic range≤± 5% is considered as that treatment effect is preferable, will be by screening with the data after optimization processing as wavelet neural network
Input data and carry out subsequent arithmetic；
Using by treated characteristic parameter, as the input of wavelet-neural network model, greenhouse tomato yield is as defeated
Out, wherein include the following steps:
The mother wavelet function of the model selection are as follows:
G (x)=cos (1.75x) exp (- x2/2) (7)
Mother wavelet function is subjected to scale and translation transition structure wavelet basis function:
Wherein, aj、bjThe scale factor and shift factor of respectively j-th hidden layer node；
ykFor the output of model:
Wherein, xi(i=1,2 ..., I) is the input of i-th of node of input layer, yk(j=1,2 ..., k) be j-th of output layer
The output of node；
Define error function E are as follows:
Wherein, ykFor the reality output of k-th of node of output layer, tkIt is exported for the target of k-th of node of output layer；
Adjustment to weight, scale factor, shift factor includes:
Wherein, learning rate: η (η > 0), factor of momentum: μ (0 < μ < 1).
2. a kind of wavelet neural network tomato yield prediction technique based on genetic algorithm as described in claim 1, feature
It is, error amount is expressed as a percentage, then fitness value is in 0~1 range, A=fi> 0.667.
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| CN113379188A (en) * | 2021-05-06 | 2021-09-10 | 贵州省烟草公司贵阳市公司 | Tobacco crop rotation planting method and system based on Internet of things |
| CN113439520A (en) * | 2021-07-21 | 2021-09-28 | 中国农业科学院农业环境与可持续发展研究所 | Intelligent decision-making method and system for crop irrigation and fertilization |
| CN115907366A (en) * | 2022-11-15 | 2023-04-04 | 淮阴工学院 | Agricultural product growth environment optimal regulation and control method and equipment based on flamingo algorithm |
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| CN115907366B (en) * | 2022-11-15 | 2023-09-22 | 淮阴工学院 | Agricultural product growth environment optimal regulation and control method and equipment based on flamingo algorithm |
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