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From: mignotte@iro.umontreal.ca Date: August 8, 2008 5:57:20 PM EDT (CA) To: seminaires@iro.umontreal.ca Subject: Predoc oral de Dumitru Erhan

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Objet: De: mignotte@iro.umontreal.ca Date: Ven 8 août 2008 17:56 À: seminaires@iro.umontreal.ca

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Bonjour.

Vous êtes tous cordialement invités au predoc oral de Dumitru Erhan (dont le directeur de these est Yoshua Bengio) au DIRO, le jeudi 14 aout a 15:00 en salle 3195 (Pavillon Aisenstadt).

Voici le titre de sa presentation:

"Heuristics for Optimizing Deep Architectures

Deep architectures are viewed by many as an efficient new way of tackling difficult Artificial Intelligence problems, such as vision or natural language processing. A flurry of models and algorithms to efficiently train them have sprung over the last several years. The key ingredient seems to be greedy, layer-wise initialization of such models. I will review the state-of-the-art and identify some of the open issues with deep architectures. I will then present our work that tackled some of these issues and propose a series of theoretical extensions and experimental work that suggest new directions for research on deep architectures --- such as learning multimodal representations of visual, textual and musical data as well as collective training of networks. I argue that tackling these problem will give us new insights into the inner workings of these models and could help the optimization process of deep architectures. "

Max Mignotte