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Raaz Dwivedi

Harvard University, MIT

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Preprint Jul 2026

ORCA-bench: How Ready Are Language Model Agents for Oncall?

The ORCA-bench benchmark is introduced, a benchmark that puts general-purpose coding agents in a production-fidelity oncall setting and is a lower bound on the engineering investment required before frontier coding agents can be safely entrusted with production reliability.

Albert Gong, Kyuseong Choi, Abhineet Agarwal et al. · 0 citations
#machine learning Open access Nov 2022

Doubly robust nearest neighbors in factor models

An improved variant of nearest neighbors (NN) for estimation with missing data in latent factor models that provides a (near-)quadratic improvement in the non-asymptotic error and admits a significantly narrower asymptotic confidence interval when compared to both unit-unit or time-time NN.

Raaz Dwivedi, Katherine Tian, Sabina Tomkins et al. · 11 citations
#machine learning Preprint Oct 2025

One Pipeline, Many Transformers: Pattern-Specific Imputation Specialists for Tabular Missing Data

A single pre-training pipeline that builds transformer-based imputation specialists through three components: an entry-wise featurization that recasts imputation as supervised prediction over row--column context, a synthetic data generator with pluggable missingness modules, and prior-data fitting on millions of synthetic tables.

Jacob Feitelberg, Dwaipayan Saha, Kyuseong Choi et al. · 2 citations · ⚡1