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omar belhaj


Last seen: 3 years ago Active since 2014

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Best training and bad prediction !!!
I used MLP(fitting) artificial neural network(ANN) to predict solar irradiation, my problem is i have gotten best trainig and te...

8 years ago | 0 answers | 1

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How to differentiate between Mse(training) and Mse(testing) ??
Hello, i would like to know how to differentiate between Mse(training) and Mse(testing) during training phases this is my part o...

8 years ago | 1 answer | 0

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why I got bad correlation coefficient if I use a wide database ??
I developed a code for the prediction, but the problem is when I work with a wide database during training I got a bad correlati...

8 years ago | 0 answers | 0

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answers

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What is the appropriate Method to normalize inputs data ????
I used sigmoidal function as activation function in hidden layer (forecasting issues).who is interval can i choose to normalize ...

9 years ago | 1 answer | 0

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Is it this command "net.divideParam.testRatio" use the data sets unseen by NN ???
So, if I’ve understood for example for this case my data sets periods 13 years net.divideParam.trainRatio = 75/100;( abou...

9 years ago | 0 answers | 0

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answers

Question


What is the appropriate Method to normalize inputs data ????
I used sigmoidal function as activation function in hidden layer (forecasting issue).which interval can i choose to normalize my...

9 years ago | 0 answers | 0

0

answers

Question


Is it necessary to test a neural networks with data set unseen by ANN ??
Purpose: A neural networks, when properly trianed must have ability to generalize and not behave just like a memory. So, for...

9 years ago | 1 answer | 0

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Differrence between feed forward & feed forward back propagation
I used neural netowrk MLP type to pridect solar irradiance, in my code i used fitnet() commands (feed forward)to creat a neural ...

9 years ago | 3 answers | 0

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answers

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Normalization inputs data & dividing data for training - validation- test
Could you help me please I have two questions about neural networks for solar irradiance forecasting. I used MLP model (Fitti...

9 years ago | 1 answer | 0

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It is necessary to reset (initialize) the weights during the learning period??
I am working on forecasting of radiation solar by Matlab and I have just beginner’s expertise with the program. it is necessary ...

9 years ago | 0 answers | 0

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Question


How i can to choose a good structure of neural networks( number of nodes in hidden layer)
I’am new to neural networks (for prediction) and I'm not sure how to go about trying to achieve better test error on my dataset....

10 years ago | 1 answer | 0

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