Search results for " learning."

Towards a theory of inductive inference

1973

Multilayer perceptron training with multiobjective memetic optimization

2016

Machine learning tasks usually come with several mutually conflicting objectives. One example is the simplicity of the learning device contrasted with the accuracy of its performance after learning. Another common example is the trade-off that must often be made between the rate of false positive and false negative predictions in diagnostic applications. For computer programs that learn from data, these objectives are formulated as mathematical functions, each of which describes one facet of the desired learning outcome. Even functions that intend to optimize the same facet may behave in a subtly different and mutually conflicting way, depending on the task and the dataset being examined. Mul…

Node co-activations as a means of error detection : Towards fault-tolerant neural networks

2022

Context: Machine learning has proved an efficient tool, but the systems need tools to mitigate risks during runtime. One approach is fault tolerance: detecting and handling errors before they cause harm. Objective: This paper investigates whether rare co-activations – pairs of usually segregated nodes activating together – are indicative of problems in neural networks (NN). These could be used to detect concept drift and flagging untrustworthy predictions. Method: We trained four NNs. For each, we studied how often each pair of nodes activates together. In a separate test set, we counted how many rare co-activations occurred with each input, and grouped the inputs based on whether its class…

Emotion Based Music Recommendation System

2020

Nowadays, music platforms provide easy access to large amounts of music. They are working continuously to improve music organization and search management thereby addressing the problem of choice and simplify exploring new music pieces. Recommendation systems gain more and more popularity and help people to select appropriate music for all occasions. However, there is still a gap in personalization and emotions driven recommendations. Music has a great influence on humans and is widely used for relaxing, mood regulation, destruction from stress and diseases, to maintain mental and physical work. There is a wide range of clinical settings and practices in music therapy for wellbeing support.…

Matemātiskās un statistiskās datu analīzes metodes cukura diabēta pētījumos

2020

Šajā darbā aprakstītas matemātiskās un statistiskās datu analīzes metodes, kas pielietotas cukura diabēta pētījumos. Tā kā cukura diabēts ir viena no izplatītākajām slimībām pasaulē, un tās slimnieku skaits ar katru gadu palielinās, ir nepieciešams izstrādāt tādus matemātiskos modeļus, kas prognozētu personas iespējamību saslimt, tādejādi spējot laicīgi veikt preventīvus pasākumus. Darbā apskatītās metodes tika implementētas brīvpiekļuves programmā R, un ar to palīdzību tika analizēti Latvijā ievākti dati, kā arī mašīnmācīšanās algoritmu izstrādē pasaulē populārā iebūvēto datu kopa PimaIndiansDatabase.

Inducing Rules of Ensemble Music Performance : A Machine Learning Approach

2013

Previous research in expressive music performance has described how solo musicians intuitively shape each note in relation to local/global score contexts. However, expression in ensemble performances, where each individual voice is played simultaneously with other voices, has been little explored. We present an exploratory study in which the performance of a string quartet is recorded and analysed by a computer. We use contact microphones to acquire four audio signals from which a set of audio descriptors is extracted individually for each musician. Moreover, we use motion capture to extract bowing descriptors (bow velocity/force) from each of the four performers. The gathered multimodal da…

A Spotlight on the Role of Radiomics and Machine-Learning Applications in the Management of Intracranial Meningiomas: A New Perspective in Neuro-Onco…

2022

Background: In recent decades, the application of machine learning technologies to medical imaging has opened up new perspectives in neuro-oncology, in the so-called radiomics field. Radiomics offer new insight into glioma, aiding in clinical decision-making and patients’ prognosis evaluation. Although meningiomas represent the most common primary CNS tumor and the majority of them are benign and slow-growing tumors, a minor part of them show a more aggressive behavior with an increased proliferation rate and a tendency to recur. Therefore, their treatment may represent a challenge. Methods: According to PRISMA guidelines, a systematic literature review was performed. We included selected a…

Performance Evaluation of EEG Based Mental Stress Assessment Approaches for Wearable Devices

2021

Mental stress has been identified as the root cause of various physical and psychological disorders. Therefore, it is crucial to conduct timely diagnosis and assessment considering the severe effects of mental stress. In contrast to other health-related wearable devices, wearable or portable devices for stress assessment have not been developed yet. A major requirement for the development of such a device is a time-efficient algorithm. This study investigates the performance of computer-aided approaches for mental stress assessment. Machine learning (ML) approaches are compared in terms of the time required for feature extraction and classification. After conducting tests on data for real-t…

Determinantes Sociales de la Salud, Modos de Transporte, y su Relación con Riesgo de Accidentalidad en Jóvenes residentes de la Región Metropolitana …

2022

Antecedentes y tema de trabajo: La movilidad y la circulación determinan dinámicas que caracterizan la vida humana. Estas actividades son tan importantes que se consideran un derecho humano universal, constituyéndose en fuente de constante preocupación para investigadores, gobiernos e instituciones. Las limitaciones al ejercicio de este derecho son un detrimento para la calidad de vida, especialmente cuando conlleva un número inaceptable de muertes y lesiones que hoy se consideran de carácter pandémico. Los eventos desfavorables para la movilidad y la circulación suelen denominarse como “suceso”, “incidente”, “choque”, “colisión”, y quizás el termino más empleado sea “accidente”. Ni experto…

Audiovisual processing of Chinese characters elicits suppression and congruency effects in MEG

2019

Learning to associate written letters/characters with speech sounds is crucial for reading acquisition. Most previous studies have focused on audiovisual integration in alphabetic languages. Less is known about logographic languages such as Chinese characters, which map onto mostly syllable-based morphemes in the spoken language. Here we investigated how long-term exposure to native language affects the underlying neural mechanisms of audiovisual integration in a logographic language using magnetoencephalography (MEG). MEG sensor and source data from 12 adult native Chinese speakers and a control group of 13 adult Finnish speakers were analyzed for audiovisual suppression (bimodal responses…