Search Results for author: Liyuan Xu

Found 14 papers, 4 papers with code

Kernel Single Proxy Control for Deterministic Confounding

no code implementations8 Aug 2023 Liyuan Xu, Arthur Gretton

We consider the problem of causal effect estimation with an unobserved confounder, where we observe a proxy variable that is associated with the confounder.

A Neural Mean Embedding Approach for Back-door and Front-door Adjustment

no code implementations12 Oct 2022 Liyuan Xu, Arthur Gretton

We consider the estimation of average and counterfactual treatment effects, under two settings: back-door adjustment and front-door adjustment.

counterfactual Density Estimation +1

Importance Weighting Approach in Kernel Bayes' Rule

no code implementations5 Feb 2022 Liyuan Xu, Yutian Chen, Arnaud Doucet, Arthur Gretton

We study a nonparametric approach to Bayesian computation via feature means, where the expectation of prior features is updated to yield expected kernel posterior features, based on regression from learned neural net or kernel features of the observations.

Sequential Kernel Embedding for Mediated and Time-Varying Dose Response Curves

no code implementations6 Nov 2021 Rahul Singh, Liyuan Xu, Arthur Gretton

We propose simple nonparametric estimators for mediated and time-varying dose response curves based on kernel ridge regression.

Causal Inference counterfactual

Deep Proxy Causal Learning and its Application to Confounded Bandit Policy Evaluation

1 code implementation NeurIPS 2021 Liyuan Xu, Heishiro Kanagawa, Arthur Gretton

Proxy causal learning (PCL) is a method for estimating the causal effect of treatments on outcomes in the presence of unobserved confounding, using proxies (structured side information) for the confounder.

Off-policy evaluation

On Instrumental Variable Regression for Deep Offline Policy Evaluation

1 code implementation21 May 2021 Yutian Chen, Liyuan Xu, Caglar Gulcehre, Tom Le Paine, Arthur Gretton, Nando de Freitas, Arnaud Doucet

By applying different IV techniques to OPE, we are not only able to recover previously proposed OPE methods such as model-based techniques but also to obtain competitive new techniques.

regression Reinforcement Learning (RL)

Learning Deep Features in Instrumental Variable Regression

1 code implementation ICLR 2021 Liyuan Xu, Yutian Chen, Siddarth Srinivasan, Nando de Freitas, Arnaud Doucet, Arthur Gretton

We propose a novel method, deep feature instrumental variable regression (DFIV), to address the case where relations between instruments, treatments, and outcomes may be nonlinear.

regression

Kernel Methods for Causal Functions: Dose, Heterogeneous, and Incremental Response Curves

no code implementations10 Oct 2020 Rahul Singh, Liyuan Xu, Arthur Gretton

We propose estimators based on kernel ridge regression for nonparametric causal functions such as dose, heterogeneous, and incremental response curves.

counterfactual regression

Pairwise Supervision Can Provably Elicit a Decision Boundary

no code implementations11 Jun 2020 Han Bao, Takuya Shimada, Liyuan Xu, Issei Sato, Masashi Sugiyama

A classifier built upon the representations is expected to perform well in downstream classification; however, little theory has been given in literature so far and thereby the relationship between similarity and classification has remained elusive.

Binary Classification Classification +5

Uncoupled Regression from Pairwise Comparison Data

1 code implementation NeurIPS 2019 Liyuan Xu, Junya Honda, Gang Niu, Masashi Sugiyama

We propose two practical methods for uncoupled regression from pairwise comparison data and show that the learned regression model converges to the optimal model with the optimal parametric convergence rate when the target variable distributes uniformly.

Learning-To-Rank regression

Polynomial-time Algorithms for Multiple-arm Identification with Full-bandit Feedback

no code implementations27 Feb 2019 Yuko Kuroki, Liyuan Xu, Atsushi Miyauchi, Junya Honda, Masashi Sugiyama

Based on our approximation algorithm, we propose novel bandit algorithms for the top-k selection problem, and prove that our algorithms run in polynomial time.

Alternate Estimation of a Classifier and the Class-Prior from Positive and Unlabeled Data

no code implementations15 Sep 2018 Masahiro Kato, Liyuan Xu, Gang Niu, Masashi Sugiyama

In this paper, we propose a novel unified approach to estimating the class-prior and training a classifier alternately.

Dueling Bandits with Qualitative Feedback

no code implementations14 Sep 2018 Liyuan Xu, Junya Honda, Masashi Sugiyama

We formulate and study a novel multi-armed bandit problem called the qualitative dueling bandit (QDB) problem, where an agent observes not numeric but qualitative feedback by pulling each arm.

Fully adaptive algorithm for pure exploration in linear bandits

no code implementations16 Oct 2017 Liyuan Xu, Junya Honda, Masashi Sugiyama

We propose the first fully-adaptive algorithm for pure exploration in linear bandits---the task to find the arm with the largest expected reward, which depends on an unknown parameter linearly.

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