2015

Online Learning to Sample

Bouchard, Guillaume, Trouillon, Théo, Perez, Julien et al.

Understand

Stochastic Gradient Descent (SGD) is one of the most widely used techniques for online optimization in machine learning.

  • In this work, we accelerate SGD by adaptively learning how to sample the most useful training examples at each time step.
  • First, we show that SGD can be used to learn the best possible sampling distribution of an importance sampling estimator.
  • Second, we show that the sampling distribution of an SGD algorithm can be estimated online by incrementally minimizing the variance of the gradient.

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