Search Results for author: Abdullah Alomar

Found 7 papers, 1 papers with code

SAMoSSA: Multivariate Singular Spectrum Analysis with Stochastic Autoregressive Noise

no code implementations NeurIPS 2023 Abdullah Alomar, Munther Dahleh, Sean Mann, Devavrat Shah

However, a theoretical underpinning of multi-stage learning algorithms involving both deterministic and stationary components has been absent in the literature despite its pervasiveness.

Open-Ended Question Answering Time Series +1

CausalSim: A Causal Framework for Unbiased Trace-Driven Simulation

1 code implementation5 Jan 2022 Abdullah Alomar, Pouya Hamadanian, Arash Nasr-Esfahany, Anish Agarwal, Mohammad Alizadeh, Devavrat Shah

Key to CausalSim is mapping unbiased trace-driven simulation to a tensor completion problem with extremely sparse observations.

Causal Inference

PerSim: Data-Efficient Offline Reinforcement Learning with Heterogeneous Agents via Personalized Simulators

no code implementations NeurIPS 2021 Anish Agarwal, Abdullah Alomar, Varkey Alumootil, Devavrat Shah, Dennis Shen, Zhi Xu, Cindy Yang

We consider offline reinforcement learning (RL) with heterogeneous agents under severe data scarcity, i. e., we only observe a single historical trajectory for every agent under an unknown, potentially sub-optimal policy.

Offline RL reinforcement-learning +1

On Multivariate Singular Spectrum Analysis and its Variants

no code implementations24 Jun 2020 Anish Agarwal, Abdullah Alomar, Devavrat Shah

We introduce and analyze a variant of multivariate singular spectrum analysis (mSSA), a popular time series method to impute and forecast a multivariate time series.

Imputation Time Series +1

Two Burning Questions on COVID-19: Did shutting down the economy help? Can we (partially) reopen the economy without risking the second wave?

no code implementations30 Apr 2020 Anish Agarwal, Abdullah Alomar, Arnab Sarker, Devavrat Shah, Dennis Shen, Cindy Yang

In essence, the method leverages information from different interventions that have already been enacted across the world and fits it to a policy maker's setting of interest, e. g., to estimate the effect of mobility-restricting interventions on the U. S., we use daily death data from countries that enforced severe mobility restrictions to create a "synthetic low mobility U. S." and predict the counterfactual trajectory of the U. S. if it had indeed applied a similar intervention.

counterfactual

tspDB: Time Series Predict DB

no code implementations17 Mar 2019 Anish Agarwal, Abdullah Alomar, Devavrat Shah

Computationally, tspDB is 59-62x and 94-95x faster compared to LSTM and DeepAR in terms of median ML model training time and prediction query latency, respectively.

Imputation Prediction Intervals +2

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