Reweighting with Boosted Decision Trees

17th International Workshop on Advanced Computing and Analysis Techniques in Physics Research

物理学;计算机科学

Rogozhnikov, Alex^1,2

National Research University, Higher School of Economics (HSE), Russia^1

Yandex School of Data Analysis (YSDA), Russia^2

关键词: Boosted decision trees;    Classification models;    High energy physics experiments (HEP);    Observed data;    Re-weighting;    Simulated events;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/762/1/012036/pdf
DOI  :  10.1088/1742-6596/762/1/012036

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

Machine learning tools are commonly used in modern high energy physics (HEP) experiments. Different models, such as boosted decision trees (BDT) and artificial neural networks (ANN), are widely used in analyses and even in the software triggers [1]. In most cases, these are classification models used to select the "signal" events from data. Monte Carlo simulated events typically take part in training of these models. While the results of the simulation are expected to be close to real data, in practical cases there is notable disagreement between simulated and observed data. In order to use available simulation in training, corrections must be introduced to generated data. One common approach is reweighting -assigning weights to the simulated events. We present a novel method of event reweighting based on boosted decision trees. The problem of checking the quality of reweighting step in analyses is also discussed.