Package ELMR. November 28, 2015

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Title Extreme Machine Learning (ELM) Version 1.0 Author Alessio Petrozziello [aut, cre] Package ELMR November 28, 2015 Maintainer Alessio Petrozziello <alessio.petrozziello@port.ac.uk> Training and prediction functions are provided for the Extreme Learning Machine algorithm (ELM). The ELM use a Single Hidden Layer Feedforward Neural Network (SLFN) with random generated weights and no gradient-based backpropagation. The training time is very short and the online version allows to update the model using small chunk of the training set at each iteration. The only parameter to tune is the hidden layer size and the learning function. Depends R (>= 3.2.2) License GPL-2 GPL-3 LazyData true RoxygenNote 5.0.1 NeedsCompilation no Repository CRAN Date/Publication 2015-11-28 14:53:50 R topics documented: OSelm_train.formula.................................... 2 OSelm_training....................................... 2 predict_elm......................................... 3 preprocess.......................................... 4 Index 5 1

2 OSelm_training OSelm_train.formula Trains an extreme learning machine with random weights Trains an extreme learning machine with random weights OSelm_train.formula(formula, data, Elm_type, nhiddenneurons, ActivationFunction, N0, Block) formula data Elm_type a symbolic description of the model to be fitted. training data frame containing the variables specified in formula. select if the ELM must perform a "regression" or "classification" nhiddenneurons number of neurons in the hidden layer ActivationFunction "rbf" for radial basis function with Gaussian kernels, "sig" for sigmoidal fucntion, "sin" for sine function, "hardlim" for hard limit function N0 Block size of the first block to be processed size of each chunk to be processed at each step returns all the parameters used in the function, the weight matrix, the labels for the classification, the number of classes found, the bias, the beta activation function and the accuracy on the trainingset OSelm_training Trains an online sequential extreme learning machine with random weights Trains an online sequential extreme learning machine with random weights OSelm_training(p, y, Elm_Type, nhiddenneurons, ActivationFunction, N0, Block)

predict_elm 3 p y Elm_Type dataset used to perform the training of the model classes vector for classiication or regressors for regression select if the ELM must perform a "regression" or "classification" nhiddenneurons number of neurons in the hidden layer ActivationFunction "rbf" for radial basis function with Gaussian kernels, "sig" for sigmoidal fucntion, "sin" for sine function, "hardlim" for hard limit function N0 Block size of the first block to be processed size of each chunk to be processed at each step returns all the parameters used in the function, the weight matrix, the labels for the classification, the number of classes found, the bias, the beta activation function and the accuracy on the trainingset References [1] N.-Y. Liang, G.-B. Huang, P. Saratchandran, and N. Sundararajan, A Fast and Accurate On-line Sequential Learning Algorithm for Feedforward Networks IEEE Transactions on Neural Networks, vol. 17, no. 6, pp. 1411-1423, 2006 Examples x = runif(100, 0, 50) train = data.frame(y,x) train = data.frame(preprocess(train)) OSelm_train.formula(y~x, train, "regression", 100, "hardlim", 10, 10) predict_elm Prediction function for the ELM model generated with the elm_training() function Prediction function for the ELM model generated with the elm_training() function predict_elm(model, test) model test the output of the elm_training() function dataset used to perform the testing of the model, the first column must be the column to be fitted for the regression or the labels for the classification

4 preprocess returns the accuracy on the testset References [1] N.-Y. Liang, G.-B. Huang, P. Saratchandran, and N. Sundararajan, "A Fast and Accurate Online Sequential Learning Algorithm for Feedforward Networks" IEEE Transactions on Neural Networks, vol. 17, no. 6, pp. 1411-1423, 2006 Examples x = runif(100, 0, 50) train = data.frame(y,x) train = data.frame(preprocess(train)) model = OSelm_train.formula(y~x, train, "regression", 100, "hardlim", 10, 10) # x = runif(100, 0, 50) test = data.frame(y,x) test = data.frame(preprocess(train)) accuracy = predict_elm(model, test) preprocess Pre processing function for the training and test data set. Each numeric variable is standardized between -1 and 1 and each categorical variable is coded with a dummy coding. Pre processing function for the training and test data set. Each numeric variable is standardized between -1 and 1 and each categorical variable is coded with a dummy coding. preprocess(data) data to be preprocesses return the pre processed dataset

Index OSelm_train.formula, 2 OSelm_training, 2 predict_elm, 3 preprocess, 4 5

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