I need to use a neural network in my OpenCV (version 3.0) project. I've created and trained neural network and it works, but if I want to load it from YML file, it doesn't predict.
This is a code where I creat, train and save my neural network:
FileStorage fs("nn.yml", FileStorage::WRITE);
int input_neurons = 7;
int hidden_neurons = 100;
int output_neurons = 5;
Ptr train_data = TrainData::loadFromCSV("data.csv", 10, 7, 12);
Ptr neural_network = ANN_MLP::create();
neural_network->setTrainMethod(ANN_MLP::BACKPROP);
neural_network->setBackpropMomentumScale(0.1);
neural_network->setBackpropWeightScale(0.05);
neural_network->setTermCriteria(TermCriteria(TermCriteria::MAX_ITER, (int)10000, 1e-6));
Mat layers = Mat(3, 1, CV_32SC1);
layers.row(0) = Scalar(input_neurons);
layers.row(1) = Scalar(hidden_neurons);
layers.row(2) = Scalar(output_neurons);
neural_network->setLayerSizes(layers);
neural_network->setActivationFunction(ANN_MLP::SIGMOID_SYM, 1, 1);
neural_network->train(train_data);
if (neural_network->isTrained()) {
neural_network->write(fs);
cout << "It's OK!" << endl;
}
But next time, if I want to load it from YML file:
Ptr neural_network = Algorithm::load("nn.yml", "neural_network");
I get the output:
[-1.#IND, -1.#IND, -1.#IND, -1.#IND, -1.#IND]
[-1.#IND, 1.0263158, 1.0263158, 1.0263158, 1.0263158]
[1.0263158, 1.0263158, 1.0263158, 1.0263158, 1.0263158]
[-1.#IND, -1.#IND, -1.#IND, -1.#IND, -1.#IND]
Ptr neural_network = Algorithm::load("nn.yml");
This line cause that I get an error:
OpenCV Error: Unspecified error (The node is neither a map nor an empty collecti on) in cvGetFileNodeByName, file C:\builds\master_PackSlave-win64-vc12-shared\op encv\modules\core\src\persistence.cpp, line 739
What am I doing wrong? Where is the problem?
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