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Modern neural networks gave rise to major breakthroughs in several research areas. In neuroscience, we are witnessing a reappraisal of neural network theory and its relevance for understanding information processing in biological systems. The research presented in this book provides various perspectives on the use of artificial neural networks as models of neural information processing. We consider the biological plausibility of neural networks, performance improvements, spiking neural networks and the use of neural networks for understanding brain function.
brain imaging --- artificial neural networks --- deep learning --- neural information processing --- backpropagation --- spiking neural networks --- brain imaging --- artificial neural networks --- deep learning --- neural information processing --- backpropagation --- spiking neural networks
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Neural networks (Computer science) --- Neural computers --- Artificial intelligence --- Artificial neural networks --- Concept learning
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Modern neural networks gave rise to major breakthroughs in several research areas. In neuroscience, we are witnessing a reappraisal of neural network theory and its relevance for understanding information processing in biological systems. The research presented in this book provides various perspectives on the use of artificial neural networks as models of neural information processing. We consider the biological plausibility of neural networks, performance improvements, spiking neural networks and the use of neural networks for understanding brain function.
brain imaging --- artificial neural networks --- deep learning --- neural information processing --- backpropagation --- spiking neural networks
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Modern neural networks gave rise to major breakthroughs in several research areas. In neuroscience, we are witnessing a reappraisal of neural network theory and its relevance for understanding information processing in biological systems. The research presented in this book provides various perspectives on the use of artificial neural networks as models of neural information processing. We consider the biological plausibility of neural networks, performance improvements, spiking neural networks and the use of neural networks for understanding brain function.
brain imaging --- artificial neural networks --- deep learning --- neural information processing --- backpropagation --- spiking neural networks
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In August 2022, researchers and developers from Armenia, Chile, Germany, and Japan met at the American University of Armenia for the third edition of the CODASSCA Workshop on Collaborative Technologies and Data Science in Smart City Applications, co-organized with a Summer School on Artificial Neural Networks and Deep Learning. This book presents their contributions on intelligent technologies in data science and human-centered computing.
Data science --- Intelligent technologies --- Artificial neural networks --- Deep learning --- Smart human-centered computing
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Variable and feature selection have become the focus of much research, especially in bioinformatics where there are many applications. Machine learning is a powerful tool to select features, however not all machine learning algorithms are on an equal footing when it comes to feature selection. Indeed, many methods have been proposed to carry out feature selection with random forests, which makes them the current go-to model in bioinformatics. On the other hand, thanks to the so-called deep learning, neural networks have benefited a huge interest resurgence in the past few years. However neural networks are blackbox models and very few attempts have been made in order to analyse the underlying process. Indeed, quite a few articles can be found about feature extraction with neural networks (for which the underlying inputs-outputs process does not need to be understood), while very few tackle feature selection. In this document, we propose new algorithms in order to carry out feature selection with deep neural networks. To assess our results, we generate regression and classification problems which allow us to compare each algorithm on multiple fronts: performances, computation time and constraints. The results obtained are really promising since we manage to achieve our goal by surpassing (or equaling) random forests performances in every case (which was set to be our “state-of-the-art” comparison). Due to the promising results obtained on artificial datasets we also tackle the DREAM4 challenge. Due to the very small number of samples available in the datasets, this challenge is supposedly an ill-suited problem for neural networks. We were nevertheless able to achieve near state of the art results. Finally, extensions are given for most of our methods. Indeed, the algorithms discussed are very modulable and can be adapted regarding the problem faced. For example, we explain how one of our algorithm can be adapted in order to prune neural networks without losing accuracy.
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In this research work, I will try to see if it is possible and advantageous to use artificial neural networks to predict American options, which are more difficult to predict than European options because of the possibility of early exercise. As there are only numerical or approximation methods available, the neural network is a perfect fit, as it is non-parametric and able to capture some extremely complex non-linear functional relations. Once the neural network is set up with an efficient structure, it will also be possible to vary the input features to gain information on the real contribution of the latter on the efficiency of the model. This research includes definitions and demonstrations of key concepts in the field, a literature review of current knowledge, practices and trends on the subject, a construction of an efficient neural network structure to address the pricing problem and various feature tests on this network, each network being compared with its predecessors but also with the chosen benchmarks: the Black- Scholes model and the Cox Ross Rubinstein binomial tree model. The main conclusions of this research work are that, once the right neural network structure was found, the use of the ANN to predict American options consistently outperformed its benchmarks. What this means for managers is that machine learning, and neural networks in particular, may be worth investigating for implementation, especially in a context where there is access to sufficient data to train the network properly. My research also shows that if one is in a context where one has to predict in real time many American option prices, then neural networks are advantageous. Indeed, once the learning phase is over, the prediction is instantaneous, contrary to the iterative method of the CRR binomial tree. This advantage can be massive in attempts to leverage the pricing algorithms. In terms of conclusions for the academic side, this work shows that there is a need to continue to develop techniques for pricing American equity options using neural networks, and that one should not focus solely on European options in the belief that the latter are easier to tackle. I also demonstrate in this work that including the dividend yield in the neural network inputs increases the predictive power of the neural network. This parameter, too often omitted, can make a big difference by itself. My research also shows that taking the interest rate into account increases the predictive power, although a little less than the dividend yield, and confirms that volatility (in my case implied volatility) is very important in the input features. However, I also find that some features do not add value. This is the case for the volume, which once added to the network does not increase its predictive power (and also makes the training phase more complex), and the open interest, who deteriorates the results. So there are indeed advantages to using neural networks to predict American options. These advantages are the accuracy (by outperforming benchmarks such as the Black-Scholes or the binomial tree model), the taking into account of parameters that are sometimes difficult to integrate, the fact that a Put and a Call can be priced with the same algorithm, the fact that in the money, at the money or out of the money options can be priced efficiently with a single algorithm, and the instantaneous computational speed once the network has been trained However, there are also disadvantages, namely the learning phase can be long, the fact that one sometimes has to perform trial and error techniques to see what changes improve the network or not, the fact that one needs a lot of good quality data to train the network and the fact that a neural network is a black box that is difficult to analyse. It is up to each person to weigh up the pros and cons of each argument.
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Soft computing --- Soft computing. --- Particle Swarm Optimization --- Artificial Neural Networks --- Neuro-Fuzzy Systems --- Machine Learning --- data mining --- genetic programming --- Electronic data processing --- Cognitive computing --- Computational intelligence --- particle swarm optimization --- artificial neural networks --- neuro-fuzzy systems --- machine learning
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In August 2022, researchers and developers from Armenia, Chile, Germany, and Japan met at the American University of Armenia for the third edition of the CODASSCA Workshop on Collaborative Technologies and Data Science in Smart City Applications, co-organized with a Summer School on Artificial Neural Networks and Deep Learning. This book presents their contributions on intelligent technologies in data science and human-centered computing.
Information technology: general issues --- Data science --- Intelligent technologies --- Artificial neural networks --- Deep learning --- Smart human-centered computing --- Data science --- Intelligent technologies --- Artificial neural networks --- Deep learning --- Smart human-centered computing
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