Aprendizaje máquina multitarea mediante edición de datos y algoritmos de aprendizaje extremo

[SPA] Cuando los seres humanos nos enfrentamos a un nuevo concepto que queremos aprender, nuestro cerebro no lo hace de forma aislada, sino que utiliza todo el conocimiento previamente aprendido para ayudarse en este nuevo aprendizaje. Además, nuestro cerebro es capaz de aislar lo que no va a beneficiarnos y a utilizar lo que realmente nos va ser útil, esto lo hace muy bien y de forma inconsciente. Sin embargo, cuando una maquina de aprendizaje es entrenada para resolver una determinada tarea, por ejemplo, a diagnosticar una determinada enfermedad, normalmente esta máquina aprende en solitario sólo con los datos disponibles sobre esa enfermedad. Hay una metodología llamada Aprendizaje Multitarea, MTL (“Multi-Task Learning”), que se fundamenta en la idea inicialmente expuesta. De esta forma, la tarea a resolver (tarea principal) se aprende conjuntamente con otras tareas relacionadas (tareas secundarias), se produce una transferencia de información entre ellas que puede ser ventajosa para el aprendizaje de la primera. Sin embargo, en problemas reales, es difícil encontrar tareas que estén relacionadas o incluso, encontrándolas, es sumamente complejo determinar el grado en que se va a realizar esa ayuda, ya que una tarea puede contener información que puede ayudar pero también perjudicar. Esta Tesis incorpora una nueva metodología que permite obtener tareas secundarias relacionadas con la que se pretende aprender (tarea principal). La segunda contribución de este trabajo se enmarca también dentro del MTL, en este caso, diseñando de forma automática una máquina MTL que elimine todos aquellos factores que perjudiquen o no beneficien al aprendizaje de la tarea principal. Esta arquitectura es única y además se obtiene sin necesidad de metodologías de ensayo/error que aumentan la complejidad de cálculo. [ENG] When humans faced with a new concept that we want to learn, our brain does not work in isolation, but rather uses all previously learned knowledge to assist in this new learning. In addition, our brain is able to isolate what is not going to benefit and use what will be really useful, it does very well and unconsciously. However, when learning machines are trained for solving an specific problem, for example, to diagnose a particular disease, usually this machine learns only the available data on this disease. There is a methodology called Multi-Task Learning (MTL), which is based on the idea initially exposed. Thus, the task to be solved (main task) is learned together with other related tasks (secondary tasks), by producing a transfer of information among them which may be advantageous for learning of the main one. But in real problems, it is extremely difficult to determine how the simultaneous learning with other related tasks affects to the performance of the main one, because a task can contain information that can be helpful (i.e. the main task learning is improved) or harmful (i.e. the main task learning gets worse). This PhD. Thesis, proposes a newmethodology that allows to obtain related secondary tasks in order to be helpful to themain one. The second contribution of thiswork is also included in theMTL framework: the complete automatically removing those factors which harm or no benefit the learning of the main task. This architecture is also unique and it is obtainedwithout the traditional test/fail methodologies which usually increase the computational complexity.Universidad Politécnica de Cartagen

Classifying BCI signals from novice users with Extreme Learning Machine

Volume 15, Issue 1 Previous ArticleNext Article Classifying BCI signals from novice users with extreme learning machine Germán Rodríguez-Bermúdez / Andrés Bueno-Crespo / F. José Martinez-Albaladejo Published Online: 2017-07-07 | DOI: https://doi.org/10.1515/phys-2017-0056 OPEN ACCESS DOWNLOAD PDF Abstract Brain computer interface (BCI) allows to control external devices only with the electrical activity of the brain. In order to improve the system, several approaches have been proposed. However it is usual to test algorithms with standard BCI signals from experts users or from repositories available on Internet. In this work, extreme learning machine (ELM) has been tested with signals from 5 novel users to compare with standard classification algorithms. Experimental results show that ELM is a suitable method to classify electroencephalogram signals from novice users.Ingeniería, Industria y Construcció

Aprendizaje multitarea en problemas con un número reducido de datos

MultiTask Learning (MTL) is a procedure to train a neural network to learn several related tasks simultaneously considering one of them as main task and the others as secondary tasks. In this paper, we have tested a method to obtain artificially tasks which are related with the main one, because in many real cases, knowledge about problem to be solved is uncertain. We use sample selection techniques to generate related tasks with the main one, in particular, samples close the classification boundary. Moreover, a new procedure to train MultiLayer Perceptrons with generated tasks is described.Este trabajo está subvencionado por el Ministerio de Educación y Ciencia, otorgado por TIC2002-03033

Sound Levels Forecasting in an Acoustic Sensor Network Using a Deep Neural Network

[EN] Wireless acoustic sensor networks are nowadays an essential tool for noise pollution monitoring and managing in cities. The increased computing capacity of the nodes that create the network is allowing the addition of processing algorithms and artificial intelligence that provide more information about the sound sources and environment, e.g., detect sound events or calculate loudness. Several models to predict sound pressure levels in cities are available, mainly road, railway and aerial traffic noise. However, these models are mostly based in auxiliary data, e.g., vehicles flow or street geometry, and predict equivalent levels for a temporal long-term. Therefore, forecasting of temporal short-term sound levels could be a helpful tool for urban planners and managers. In this work, a Long Short-Term Memory (LSTM) deep neural network technique is proposed to model temporal behavior of sound levels at a certain location, both sound pressure level and loudness level, in order to predict near-time future values. The proposed technique can be trained for and integrated in every node of a sensor network to provide novel functionalities, e.g., a method of early warning against noise pollution and of backup in case of node or network malfunction. To validate this approach, one-minute period equivalent sound levels, captured in a two-month measurement campaign by a node of a deployed network of acoustic sensors, have been used to train it and to obtain different forecasting models. Assessments of the developed LSTM models and Auto regressive integrated moving average models were performed to predict sound levels for several time periods, from 1 to 60 min. Comparison of the results show that the LSTM models outperform the statistics-based models. In general, the LSTM models achieve a prediction of values with a mean square error less than 4.3 dB for sound pressure level and less than 2 phons for loudness. Moreover, the goodness of fit of the LSTM models and the behavior pattern of the data in terms of prediction of sound levels are satisfactory.This work was partially supported by the Fundacion Seneca del Centro de Coordinacion de la Investigacion de la Region de Murcia under Project 20813/PI/18.Navarro, JM.; Martínez-España, R.; Bueno-Crespo, A.; Cecilia-Canales, JM.; Martínez, R. (2020). Sound Levels Forecasting in an Acoustic Sensor Network Using a Deep Neural Network. Sensors. 20(3):1-16. https://doi.org/10.3390/s20030903S116203Hornikx, M. (2016). Ten questions concerning computational urban acoustics. Building and Environment, 106, 409-421. doi:10.1016/j.buildenv.2016.06.028Murphy, E., & King, E. A. (2010). 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(2017). A Big Data Framework for Urban Noise Analysis and Management in Smart Cities. Acta Acustica united with Acustica, 103(4), 552-560. doi:10.3813/aaa.919084Längkvist, M., Karlsson, L., & Loutfi, A. (2014). A review of unsupervised feature learning and deep learning for time-series modeling. Pattern Recognition Letters, 42, 11-24. doi:10.1016/j.patrec.2014.01.008Che, Z., Purushotham, S., Cho, K., Sontag, D., & Liu, Y. (2018). Recurrent Neural Networks for Multivariate Time Series with Missing Values. Scientific Reports, 8(1). doi:10.1038/s41598-018-24271-9Kim, H.-G., & Kim, J. Y. (2017). Environmental sound event detection in wireless acoustic sensor networks for home telemonitoring. China Communications, 14(9), 1-10. doi:10.1109/cc.2017.8068759Luque, A., Romero-Lemos, J., Carrasco, A., & Barbancho, J. (2018). Improving Classification Algorithms by Considering Score Series in Wireless Acoustic Sensor Networks. Sensors, 18(8), 2465. doi:10.3390/s18082465Zhang, Y., Fu, Y., & Wang, R. (2018). Collaborative representation based classification for vehicle recognition in acoustic sensor networks. Journal of Computational Methods in Sciences and Engineering, 18(2), 349-358. doi:10.3233/jcm-180794Cobos, M., Perez-Solano, J. J., Felici-Castell, S., Segura, J., & Navarro, J. M. (2014). Cumulative-Sum-Based Localization of Sound Events in Low-Cost Wireless Acoustic Sensor Networks. IEEE/ACM Transactions on Audio, Speech, and Language Processing, 22(12), 1792-1802. doi:10.1109/taslp.2014.2351132Sevillano, X., Socoró, J. C., Alías, F., Bellucci, P., Peruzzi, L., Radaelli, S., … Zambon, G. (2016). DYNAMAP – Development of low cost sensors networks for real time noise mapping. Noise Mapping, 3(1). doi:10.1515/noise-2016-0013Segura-Garcia, J., Navarro-Ruiz, J., Perez-Solano, J., Montoya-Belmonte, J., Felici-Castell, S., Cobos, M., & Torres-Aranda, A. (2018). Spatio-Temporal Analysis of Urban Acoustic Environments with Binaural Psycho-Acoustical Considerations for IoT-Based Applications. Sensors, 18(3), 690. doi:10.3390/s18030690Bello, J. P., Silva, C., Nov, O., Dubois, R. L., Arora, A., Salamon, J., … Doraiswamy, H. (2019). SONYC. Communications of the ACM, 62(2), 68-77. doi:10.1145/3224204Socoró, J., Alías, F., & Alsina-Pagès, R. (2017). An Anomalous Noise Events Detector for Dynamic Road Traffic Noise Mapping in Real-Life Urban and Suburban Environments. Sensors, 17(10), 2323. doi:10.3390/s17102323Yu, L., & Kang, J. (2009). Modeling subjective evaluation of soundscape quality in urban open spaces: An artificial neural network approach. The Journal of the Acoustical Society of America, 126(3), 1163-1174. doi:10.1121/1.3183377Lopez-Ballester, J., Pastor-Aparicio, A., Segura-Garcia, J., Felici-Castell, S., & Cobos, M. (2019). Computation of Psycho-Acoustic Annoyance Using Deep Neural Networks. 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Segmentación de imágenes de células cervicovaginales con aprendizaje profundo

Este estudio explora el uso de técnicas de aprendizaje profundo para la segmentación y clasificación de imágenes de células cervicales. Las imágenes provienen de citologías de cuatro clases de anormalidad según el sistema Bethesda 2014. Los métodos utilizados son redes completamente convolucionales para la segmentación semántica, que etiquetan cada píxel como núcleo, citoplasmas o fondo, y redes neuronales convolucionales para la clasificación de imágenes, que asignan cada imagen de célula a una de las cuatro clases. Los resultados muestran que las máscaras de segmentación mejoran el rendimiento de la clasificación. Los mejores modelos son U-Net para segmentación y una concatenación de dos redes neuronales convolucionales para clasificación. El estudio concluye que la inteligencia artificial puede ayudar a patólogos en el diagnóstico de cáncer cervical al proporcionar una segmentación y clasificación precisas y eficientes de las imágenes de células.Ingeniería, Industria y Construcció

METADOCK 2: a high-throughput parallel metaheuristic scheme for molecular docking

[EN] Motivation Molecular docking methods are extensively used to predict the interaction between protein-ligand systems in terms of structure and binding affinity, through the optimization of a physics-based scoring function. However, the computational requirements of these simulations grow exponentially with: (i) the global optimization procedure, (ii) the number and degrees of freedom of molecular conformations generated and (iii) the mathematical complexity of the scoring function. Results In this work, we introduce a novel molecular docking method named METADOCK 2, which incorporates several novel features, such as (i) a ligand-dependent blind docking approach that exhaustively scans the whole protein surface to detect novel allosteric sites, (ii) an optimization method to enable the use of a wide branch of metaheuristics and (iii) a heterogeneous implementation based on multicore CPUs and multiple graphics processing units. Two representative scoring functions implemented in METADOCK 2 are extensively evaluated in terms of computational performance and accuracy using several benchmarks (such as the well-known DUD) against AutoDock 4.2 and AutoDock Vina. Results place METADOCK 2 as an efficient and accurate docking methodology able to deal with complex systems where computational demands are staggering and which outperforms both AutoDock Vina and AutoDock 4.This work was partially supported by the Fundación Séneca del Centro de Coordinación de la Investigación de la Región de Murcia [Projects 20813/PI/ 18, 20988/PI/18, 20524/PDC/18] and by the Spanish Ministry of Science, Innovation and Universities [TIN2016-78799-P (AEI/FEDER, UE), CTQ2017-87974-R]. The authors thankfully acknowledge the computer resources at CTE-POWER and the technical support provided by Barcelona Supercomputing Center - Centro Nacional de Supercomputación [RES-BCV2018-3-0008].Imbernón, B.; Serrano, A.; Bueno-Crespo, A.; Abellán, JL.; Pérez-Sánchez, H.; Cecilia-Canales, JM. (2020). METADOCK 2: a high-throughput parallel metaheuristic scheme for molecular docking. Bioinformatics. 1-6. https://doi.org/10.1093/bioinformatics/btz958S16Bianchi, L., Dorigo, M., Gambardella, L. M., & Gutjahr, W. J. (2008). A survey on metaheuristics for stochastic combinatorial optimization. Natural Computing, 8(2), 239-287. doi:10.1007/s11047-008-9098-4Cecilia, J. M., Llanes, A., Abellán, J. L., Gómez-Luna, J., Chang, L.-W., & Hwu, W.-M. W. (2018). High-throughput Ant Colony Optimization on graphics processing units. Journal of Parallel and Distributed Computing, 113, 261-274. doi:10.1016/j.jpdc.2017.12.002Desiraju, G., & Steiner, T. (2001). 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Soft Computing Techiniques for the Protein Folding Problem on High Performance Computing Architectures

The protein-folding problem has been extensively studied during the last fifty years. The understanding of the dynamics of global shape of a protein and the influence on its biological function can help us to discover new and more effective drugs to deal with diseases of pharmacological relevance. Different computational approaches have been developed by different researchers in order to foresee the threedimensional arrangement of atoms of proteins from their sequences. However, the computational complexity of this problem makes mandatory the search for new models, novel algorithmic strategies and hardware platforms that provide solutions in a reasonable time frame. We present in this revision work the past and last tendencies regarding protein folding simulations from both perspectives; hardware and software. Of particular interest to us are both the use of inexact solutions to this computationally hard problem as well as which hardware platforms have been used for running this kind of Soft Computing techniques.This work is jointly supported by the FundaciónSéneca (Agencia Regional de Ciencia y Tecnología, Región de Murcia) under grants 15290/PI/2010 and 18946/JLI/13, by the Spanish MEC and European Commission FEDER under grant with reference TEC2012-37945-C02-02 and TIN2012-31345, by the Nils Coordinated Mobility under grant 012-ABEL-CM-2014A, in part financed by the European Regional Development Fund (ERDF). We also thank NVIDIA for hardware donation within UCAM GPU educational and research centers.Ingeniería, Industria y Construcció

A Decision Support System for Water Optimization in Anti-Frost Techniques by Sprinklers

[EN] Precision agriculture is a growing sector that improves traditional agricultural processes through the use of new technologies. In southeast Spain, farmers are continuously fighting against harsh conditions caused by the effects of climate change. Among these problems, the great variability of temperatures (up to 20 degrees C in the same day) stands out. This causes the stone fruit trees to flower prematurely and the low winter temperatures freeze the flower causing the loss of the crop. Farmers use anti-freeze techniques to prevent crop loss and the most widely used techniques are those that use water irrigation as they are cheaper than other techniques. However, these techniques waste too much water and it is a scarce resource, especially in this area. In this article, we propose a novel intelligent Internet of Things (IoT) monitoring system to optimize the use of water in these anti-frost techniques while minimizing crop loss. The intelligent component of the IoT system is designed using an approach based on a multivariate Long Short-Term Memory (LSTM) model, designed to predict low temperatures. We compare the proposed approach of multivariate model with the univariate counterpart version to figure out which model obtains better accuracy to predict low temperatures. An accurate prediction of low temperatures would translate into significant water savings, as anti-frost techniques would not be activated without being necessary. Our experimental results show that the proposed multivariate LSTM approach improves the univariate counterpart version, obtaining an average quadratic error no greater than 0.65 degrees C and a coefficient of determination R2 greater than 0.97. The proposed system has been deployed and is currently operating in a real environment obtained satisfactory performance.This work has been partially supported by the Spanish Ministry of Science and Innovation, under the Ramon y Cajal Program (Grant No. RYC2018-025580-I) and under grants RTI2018-096384-B-I00, RTC-2017-6389-5 and RTC2019-007159-5, by the Fundacion Seneca del Centro de Coordinacion de la Investigacion de la Region de Murcia under Project 20813/PI/18, and by the "Conselleria de Educacion, Investigacion, Cultura y Deporte, Direccio General de Ciencia i Investigacio, Proyectos AICO/2020", Spain, under Grant AICO/2020/302.Guillén-Navarro, MA.; Martínez-España, R.; Bueno-Crespo, A.; Morales-García, J.; Ayuso, B.; Cecilia-Canales, JM. (2020). A Decision Support System for Water Optimization in Anti-Frost Techniques by Sprinklers. Sensors. 20(24):1-15. https://doi.org/10.3390/s20247129S1152024Melgarejo-Moreno, J., López-Ortiz, M.-I., & Fernández-Aracil, P. (2019). Water distribution management in South-East Spain: A guaranteed system in a context of scarce resources. Science of The Total Environment, 648, 1384-1393. doi:10.1016/j.scitotenv.2018.08.263Ferrández-Pastor, F., García-Chamizo, J., Nieto-Hidalgo, M., & Mora-Martínez, J. (2018). Precision Agriculture Design Method Using a Distributed Computing Architecture on Internet of Things Context. Sensors, 18(6), 1731. doi:10.3390/s18061731Liaghat. (2010). A Review: The Role of Remote Sensing in Precision Agriculture. American Journal of Agricultural and Biological Sciences, 5(1), 50-55. doi:10.3844/ajabssp.2010.50.55Nelson, G. C., van der Mensbrugghe, D., Ahammad, H., Blanc, E., Calvin, K., Hasegawa, T., … Willenbockel, D. (2013). Agriculture and climate change in global scenarios: why don’t the models agree. Agricultural Economics, 45(1), 85-101. doi:10.1111/agec.12091Crookston, R. K. (2006). 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Machine learning assessments of soil drying for agricultural planning. Computers and Electronics in Agriculture, 104, 93-104. doi:10.1016/j.compag.2014.04.004Mohammadi, K., Shamshirband, S., Motamedi, S., Petković, D., Hashim, R., & Gocic, M. (2015). Extreme learning machine based prediction of daily dew point temperature. Computers and Electronics in Agriculture, 117, 214-225. doi:10.1016/j.compag.2015.08.008Feng, Y., Peng, Y., Cui, N., Gong, D., & Zhang, K. (2017). Modeling reference evapotranspiration using extreme learning machine and generalized regression neural network only with temperature data. Computers and Electronics in Agriculture, 136, 71-78. doi:10.1016/j.compag.2017.01.027Jin, X.-B., Yu, X.-H., Wang, X.-Y., Bai, Y.-T., Su, T.-L., & Kong, J.-L. (2020). Deep Learning Predictor for Sustainable Precision Agriculture Based on Internet of Things System. Sustainability, 12(4), 1433. doi:10.3390/su12041433Castañeda-Miranda, A., & Castaño-Meneses, V. M. (2020). Internet of things for smart farming and frost intelligent control in greenhouses. Computers and Electronics in Agriculture, 176, 105614. doi:10.1016/j.compag.2020.105614Tzounis, A., Katsoulas, N., Bartzanas, T., & Kittas, C. (2017). Internet of Things in agriculture, recent advances and future challenges. Biosystems Engineering, 164, 31-48. doi:10.1016/j.biosystemseng.2017.09.007Shi, X., An, X., Zhao, Q., Liu, H., Xia, L., Sun, X., & Guo, Y. (2019). State-of-the-Art Internet of Things in Protected Agriculture. Sensors, 19(8), 1833. doi:10.3390/s19081833Jawad, H., Nordin, R., Gharghan, S., Jawad, A., & Ismail, M. (2017). Energy-Efficient Wireless Sensor Networks for Precision Agriculture: A Review. Sensors, 17(8), 1781. doi:10.3390/s17081781Guillén‐Navarro, M. A., Martínez‐España, R., López, B., & Cecilia, J. M. (2019). A high‐performance IoT solution to reduce frost damages in stone fruits. Concurrency and Computation: Practice and Experience, 33(2). doi:10.1002/cpe.5299Guillén, M. A., Llanes, A., Imbernón, B., Martínez-España, R., Bueno-Crespo, A., Cano, J.-C., & Cecilia, J. M. (2020). Performance evaluation of edge-computing platforms for the prediction of low temperatures in agriculture using deep learning. The Journal of Supercomputing, 77(1), 818-840. doi:10.1007/s11227-020-03288-

Experiencias en la impartición a distancia de varias asignaturas del grado de Ingeniería Informática

[SPA] El presente trabajo reporta las experiencias obtenidas en la impartición de varias asignaturas del Grado de Ingeniería Informática en la Universidad Católica San Antonio de Murcia, durante el curso 2010-2011. La principal contribución del trabajo está dada por la recomendación de un conjunto de actividades metodológicas utilizadas para la enseñanza a distancia, destacando las principales fortalezas. Se analiza de manera crítica algunas evidencias relacionadas con la evaluación del proceso de enseñanza aprendizaje desde el punto de vista de los resultados obtenidos por los estudiantes, la labor del profesor, el uso de las herramientas, la efectividad de las metodologías utilizadas, entre otros.[ENG] This paper shows the most relevant experiencies collected form the teaching of sevelar subjects of the Computer Engineering Degree, at Universidad Católica San Antonio de Murcia, during the curse 2010-2011. The main contribution of this work is related with the recomendation of a set of teaching learning activities using in on line teaching. The most importat strengths are reported. Some evidences related to the evaluaciotn of the teaching/learning process are given. They are based on the analysis of the results obtained by students, the teacher's work, the use of tools, the effectiveness of the methodologies used, etc.Campus Mare Nostrum, Universidad Politécnica de Cartagena, Universidad de Murcia, Región de Murci

Performance evaluation of edge-computing platforms for the prediction of low temperatures in agriculture using deep learning

[EN] The Internet of Things (IoT) is driving the digital revolution. AlSome palliative measures aremost all economic sectors are becoming "Smart" thanks to the analysis of data generated by IoT. This analysis is carried out by advance artificial intelligence (AI) techniques that provide insights never before imagined. The combination of both IoT and AI is giving rise to an emerging trend, called AIoT, which is opening up new paths to bring digitization into the new era. However, there is still a big gap between AI and IoT, which is basically in the computational power required by the former and the lack of computational resources offered by the latter. This is particularly true in rural IoT environments where the lack of connectivity (or low-bandwidth connections) and power supply forces the search for "efficient" alternatives to provide computational resources to IoT infrastructures without increasing power consumption. In this paper, we explore edge computing as a solution for bridging the gaps between AI and IoT in rural environment. We evaluate the training and inference stages of a deep-learning-based precision agriculture application for frost prediction in modern Nvidia Jetson AGX Xavier in terms of performance and power consumption. Our experimental results reveal that cloud approaches are still a long way off in terms of performance, but the inclusion of GPUs in edge devices offers new opportunities for those scenarios where connectivity is still a challenge.This work was partially supported by the Fundacion Seneca del Centro de Coordinacion de la Investigacion de la Region de Murcia under Project 20813/PI/18, and by Spanish Ministry of Science, Innovation and Universities under grants RTI2018-096384-B-I00 (AEI/FEDER, UE) and RTC-2017-6389-5.Guillén-Navarro, MA.; Llanes, A.; Imbernón, B.; Martínez-España, R.; Bueno-Crespo, A.; Cano, J.; Cecilia-Canales, JM. (2021). Performance evaluation of edge-computing platforms for the prediction of low temperatures in agriculture using deep learning. The Journal of Supercomputing. 77:818-840. https://doi.org/10.1007/s11227-020-03288-w8188407