Search Results for author: Miruna Oprescu

Found 11 papers, 8 papers with code

Efficient and Sharp Off-Policy Evaluation in Robust Markov Decision Processes

no code implementations29 Mar 2024 Andrew Bennett, Nathan Kallus, Miruna Oprescu, Wen Sun, Kaiwen Wang

We characterize the sharp bounds on policy value under this model, that is, the tightest possible bounds given by the transition observations from the original MDP, and we study the estimation of these bounds from such transition observations.

Off-policy evaluation

Low-Rank MDPs with Continuous Action Spaces

no code implementations6 Nov 2023 Andrew Bennett, Nathan Kallus, Miruna Oprescu

Low-Rank Markov Decision Processes (MDPs) have recently emerged as a promising framework within the domain of reinforcement learning (RL), as they allow for provably approximately correct (PAC) learning guarantees while also incorporating ML algorithms for representation learning.

PAC learning Reinforcement Learning (RL) +1

B-Learner: Quasi-Oracle Bounds on Heterogeneous Causal Effects Under Hidden Confounding

2 code implementations20 Apr 2023 Miruna Oprescu, Jacob Dorn, Marah Ghoummaid, Andrew Jesson, Nathan Kallus, Uri Shalit

There has been recent progress on robust and efficient methods for estimating the conditional average treatment effect (CATE) function, but these methods often do not take into account the risk of hidden confounding, which could arbitrarily and unknowingly bias any causal estimate based on observational data.

valid

Adaptive Bias Correction for Improved Subseasonal Forecasting

1 code implementation21 Sep 2022 Soukayna Mouatadid, Paulo Orenstein, Genevieve Flaspohler, Judah Cohen, Miruna Oprescu, Ernest Fraenkel, Lester Mackey

Subseasonal forecasting -- predicting temperature and precipitation 2 to 6 weeks ahead -- is critical for effective water allocation, wildfire management, and drought and flood mitigation.

Management Precipitation Forecasting

Robust and Agnostic Learning of Conditional Distributional Treatment Effects

1 code implementation23 May 2022 Nathan Kallus, Miruna Oprescu

Our method is model-agnostic in that it can provide the best projection of CDTE onto the regression model class.

regression

SubseasonalClimateUSA: A Dataset for Subseasonal Forecasting and Benchmarking

2 code implementations NeurIPS 2023 Soukayna Mouatadid, Paulo Orenstein, Genevieve Flaspohler, Miruna Oprescu, Judah Cohen, Franklyn Wang, Sean Knight, Maria Geogdzhayeva, Sam Levang, Ernest Fraenkel, Lester Mackey

To streamline this process and accelerate future development, we introduce SubseasonalClimateUSA, a curated dataset for training and benchmarking subseasonal forecasting models in the United States.

Benchmarking

Online Learning with Optimism and Delay

1 code implementation13 Jun 2021 Genevieve Flaspohler, Francesco Orabona, Judah Cohen, Soukayna Mouatadid, Miruna Oprescu, Paulo Orenstein, Lester Mackey

Inspired by the demands of real-time climate and weather forecasting, we develop optimistic online learning algorithms that require no parameter tuning and have optimal regret guarantees under delayed feedback.

Benchmarking Weather Forecasting

Estimating the Long-Term Effects of Novel Treatments

no code implementations NeurIPS 2021 Keith Battocchi, Eleanor Dillon, Maggie Hei, Greg Lewis, Miruna Oprescu, Vasilis Syrgkanis

Policy makers typically face the problem of wanting to estimate the long-term effects of novel treatments, while only having historical data of older treatment options.

BIG-bench Machine Learning

Machine Learning Estimation of Heterogeneous Treatment Effects with Instruments

2 code implementations NeurIPS 2019 Vasilis Syrgkanis, Victor Lei, Miruna Oprescu, Maggie Hei, Keith Battocchi, Greg Lewis

We develop a statistical learning approach to the estimation of heterogeneous effects, reducing the problem to the minimization of an appropriate loss function that depends on a set of auxiliary models (each corresponding to a separate prediction task).

BIG-bench Machine Learning

Orthogonal Random Forest for Causal Inference

1 code implementation9 Jun 2018 Miruna Oprescu, Vasilis Syrgkanis, Zhiwei Steven Wu

We provide a consistency rate and establish asymptotic normality for our estimator.

Causal Inference

Flexible and Scalable Deep Learning with MMLSpark

1 code implementation11 Apr 2018 Mark Hamilton, Sudarshan Raghunathan, Akshaya Annavajhala, Danil Kirsanov, Eduardo de Leon, Eli Barzilay, Ilya Matiach, Joe Davison, Maureen Busch, Miruna Oprescu, Ratan Sur, Roope Astala, Tong Wen, ChangYoung Park

In this work we detail a novel open source library, called MMLSpark, that combines the flexible deep learning library Cognitive Toolkit, with the distributed computing framework Apache Spark.

Distributed Computing

Cannot find the paper you are looking for? You can Submit a new open access paper.