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AI 根据所提供的论文材料归类:摘要以观测数据中的平均和个体化处理效应估计为核心,调参与模型比较均服务于因果推断。

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关注这篇论文的作者
Damian Machlanski
Paul Clarke

准确估计因果效应时的超参数调优挑战

研究问题
观测数据中的因果效应估计应如何调参,估计器、基础学习器、超参数和代理评价指标分别对最终表现有多大影响?
方法与思路
作者在四个因果推断基准数据集上组合常用因果估计器、基础学习器与调参指标,开展大规模经验比较。
材料陈述的贡献
摘要报告调参提高了达到其最先进表现标准的概率,同时指出常用指标跨场景表现不一致,尚缺统一可靠的评价指标。
阅读关注点
应核对基准效应真值来源、调参预算和数据划分,辨明“最先进表现”的判据,并检查平均效应与个体化效应的评价差异。
阅读边界
这是 arXiv 预印本,同行评审及期刊接收未经核实;摘要中的改善限于所考察组合,不能推出某个指标或估计器普遍最优。

原文摘要

ML is playing an increasingly crucial role in estimating causal effects of treatments on outcomes from observational data. Many ML methods (`causal estimators') have been proposed for this task. All of these methods, as with any ML approach, require extensive hyperparameter tuning. For non-causal predictive tasks, there is a consensus on the choice of tuning metrics (e.g. mean squared error), making it simple to compare models. However, for causal inference tasks, such a consensus is yet to be reached, making any comparison of causal models difficult. On top of that, there is no ideal metric on which to tune causal estimators, so one must rely on proxies. Furthermore, the fact that model selection in causal inference involves multiple components (causal estimator, ML regressor, hyperparameters, metric), complicates the issue even further. In order to evaluate the importance of each component, we perform an extensive empirical study on their combination. Our experimental setup involves many commonly used causal estimators, regressors (`base learners' henceforth) and metrics applied to four well-known causal inference benchmark datasets. Our results show that hyperparameter tuning increased the probability of reaching state-of-the-art performance in average ($65\% {\rightarrow} 81\%$) and individualised ($50\% {\rightarrow} 57\%$) effect estimation with only commonly used estimators. We also show that the performance of standard metrics can be inconsistent across different scenarios. Our findings highlight the need for further research to establish whether metrics uniformly capable of state-of-the-art performance in causal model evaluation can be found.

笔记与分组
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