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Defence in the field of computer science, Mudassar Abbas, M.Sc.(Tech.)

Advanced machine learning methods are able to tune/calibrate and regularize complex models in nature and technological systems
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Mudassar Abbas, M.Sc.(Tech.), will defend the dissertation "Training methods of climate and neural network models" on Thursday 15 November at 12 noon Aalto University School of Science, lecture hall AS2, Maarintie 8, Espoo. It is presented in the dissertation, how the Bayesian optimization method is a suitable technique for parametric tuning of climate and numerical weather prediction models. The adversarial training method can be combined with the Ladder Networks as a regularization technique.

When modeling complex phenomena in nature and in technological systems, one is often faced with the task of tuning/calibrating the models. In such cases, there typically exists a need for model parameter (and/or meta-parameter) value tuning for more effective modeling performance. Often such cannot be done manually, and in the machine learning approach, the tuning is done in an algorithmic and data-driven manner and is called model training. The thesis presents studies in which such methods are adopted, in the contexts of climate and artificial neural networks, and proposes novel techniques.

One of the studies is on the suitability of a well-known machine learning method called Bayesian
optimization (BO), for parametric tuning of chaotic systems such as climate and numerical weather
prediction (NWP) models. The obtained results show that BO is a suitable method for such tuning tasks.

A major desiderata for a trained machine learning model is the ability to generalize well to unseen data and thus the phenomena such as (so-called) under- and overfitting are to be avoided. In this context, adopting (so-called) regularization methods as part of the model training process has become a standard procedure. In this thesis, we introduce a regularization framework that is shown to have close connections with many existing state-of-the-art regularization approaches. An adversarial variant, derived from the proposed regularization framework, is used for solving a classification task, and the obtained results are compared to those of other regularization methods. 

Opponent: Professor Jukka Heikkonen, University of Turku

Custos: Professor Kimmo Kaski, Aalto University School of Science, Department of Computer Science 

Electronic dissertation: http://urn.fi/URN:ISBN:978-952-60-8259-2

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