Rolf Jagerman

About me

I am a software engineer at Google Research with interests in ML infrastructure, Learning-to-Rank and Counterfactual Learning. Before joining Google I obtained my PhD at the University of Amsterdam, my MSc at ETH Z├╝rich and my BSc at Delft University of Technology.

You can download my CV here.

Open Source Projects

Rax: Composable Learning-to-Rank using JAX.

PyTorchLTR: Learning-to-Rank in PyTorch.

Glint: Spark-compatible parameter server.


R. Jagerman, Z. Qin, X. Wang, M. Bendersky and M. Najork, On Optimizing Top-K Metrics for Neural Ranking Models. SIGIR, 2022.

Z. Qin, H. Zhuang, R. Jagerman, X. Qian, P. Hu, C. Chen, X. Wang, M. Bendersky and M. Najork, Bootstrapping Recommendations at Chrome Web Store. KDD, 2021.

R. Jagerman, W. Kong, R. Pasumarthi, Z. Qin, M. Bendersky and M. Najork, Improving Cloud Storage Search with User Activity. WSDM, 2021.

R. Jagerman, Efficient, Safe and Adaptive Learning from User Interactions. PhD Thesis, 2020.

R. Jagerman and M. de Rijke, Accelerated Convergence for Counterfactual Learning to Rank. SIGIR, 2020.

R. Jagerman, I. Markov and M. de Rijke, Safe Exploration for Optimizing Contextual Bandits. TOIS, 2020.

R. Jagerman, H. Oosterhuis and M. de Rijke, To Model or to Intervene: A Comparison of Counterfactual and Online Learning to Rank from User Interactions. SIGIR, 2019.

R. Jagerman, I. Markov and M. de Rijke, When People Change their Mind: Off-Policy Evaluation in Non-stationary Recommendation Environments. WSDM, 2019.

R. Jagerman, K. Balog and M. de Rijke, OpenSearch: Lessons Learned from an Online Evaluation Campaign. JDIQ, 2018.

R. Jagerman, K. Balog, P. Schaer, J. Schaible, N. Tavakolpoursaleh and M. de Rijke, Overview of TREC OpenSearch 2017. TREC, 2017.

R. Jagerman, H. Oosterhuis and M. de Rijke, Query-level Ranker Specialization. LEARNER, 2017.

R. Jagerman, J. Kiseleva and M. de Rijke, Modeling Label Ambiguity for Neural List-Wise Learning to Rank. Neu-IR, 2017.

R. Jagerman, C. Eickhoff and M. de Rijke, Computing Web-scale Topic Models using an Asynchronous Parameter Server. SIGIR, 2017.