Search Results for author: Kei Ishikawa

Found 5 papers, 2 papers with code

On the Parallel Complexity of Multilevel Monte Carlo in Stochastic Gradient Descent

no code implementations3 Oct 2023 Kei Ishikawa

In the stochastic gradient descent (SGD) for sequential simulations such as the neural stochastic differential equations, the Multilevel Monte Carlo (MLMC) method is known to offer better theoretical computational complexity compared to the naive Monte Carlo approach.

A Convex Framework for Confounding Robust Inference

1 code implementation21 Sep 2023 Kei Ishikawa, Niao He, Takafumi Kanamori

We study policy evaluation of offline contextual bandits subject to unobserved confounders.

Model Selection Multi-Armed Bandits

Kernel Conditional Moment Constraints for Confounding Robust Inference

2 code implementations26 Feb 2023 Kei Ishikawa, Niao He

It can be shown that our estimator contains the recently proposed sharp estimator by Dorn and Guo (2022) as a special case, and our method enables a novel extension of the classical marginal sensitivity model using f-divergence.

Multi-Armed Bandits

Efficient Debiased Evidence Estimation by Multilevel Monte Carlo Sampling

no code implementations14 Jan 2020 Kei Ishikawa, Takashi Goda

In this paper, we propose a new stochastic optimization algorithm for Bayesian inference based on multilevel Monte Carlo (MLMC) methods.

Bayesian Inference Stochastic Optimization

Multilevel Monte Carlo estimation of log marginal likelihood

no code implementations23 Dec 2019 Takashi Goda, Kei Ishikawa

In this short note we provide an unbiased multilevel Monte Carlo estimator of the log marginal likelihood and discuss its application to variational Bayes.

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