Cedric Archambeau

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Learning Representations for Hyperparameter Transfer Learning

Bayesian optimization (BO) is a model-based approach for gradient-free black-box function optimization, such as hyperparameter optimization, critical in deep learning. Typically, BO relies on conventional Gaussian process regression, whose algorithmic complexity is cubic in the number of evaluations. As a result, Gaussian process-based BO cannot leverage large numbers of past function evaluations, for example, to warm-start related BO runs. After a brief intro to BO and an overview of several use cases at Amazon, I will discuss a multi-task adaptive Bayesian linear regression model, whose computational complexity is attractive (linear) in the number of function evaluations and able to leverage information of related black-box functions through a shared deep neural net. Experimental results show that the neural net learns a representation suitable for warm-starting related BO runs and that they can be accelerated when the target black-box function (e.g., validation loss) is learned together with other related signals (e.g., training loss). The proposed method was found to be at least one order of magnitude faster than competing neural net-based methods recently published in the literature.

Cedric is the science lead of Amazon Core AI, with teams in Berlin, Barcelona, Tuebingen, and Seattle. His work on democratizing machine learning enables teams at Amazon deliver a wide range of machine learning-based products, including customer facing services such as Amazon SageMaker (aws.amazon.com/sagemaker). Currently, he is interested in algorithms that learn representations, algorithms that learn to learn, and algorithms that avoid catastrophic forgetting (in deep learning). Prior to joining Amazon, he led the Machine Learning group at Xerox Research Centre Europe (now Naver Labs Europe). His team conducted applied research in machine learning, computational statistics and mechanism design, with applications in customer care, transportation and governmental services. He joined Amazon, Berlin, as an Applied Science Manager in October 2013, where he was in charge of delivering zero-parameter machine learning algorithms.

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