arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2202.01336cs.LG
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探索Transformer骨干用于异质性治疗效果估计

Exploring Transformer Backbones for Heterogeneous Treatment Effect Estimation

Chinese Academy of Science(中国科学院);Carnegie Mellon University(卡内基梅隆大学);AWS AI, Amazon(亚马逊AWS人工智能);MBZUAI(穆罕默德·本·扎耶德人工智能大学)

Yi-Fan Zhang, Hanlin Zhang, Zachary C. Lipton, Li Erran Li, Eric P. Xing

摘要:

治疗效果估计(TEE)以前的工作并没有得到广泛的使用,因为它们主要是理论性的,其中强参数的假设,但难以处理的实际应用。最近的工作使用多层感知器(MLP)来建模因果关系,然而,MLP远远落后于ML方法的最新进展,这限制了它们的适用性和通用性。为了超越单一领域的制定,并朝着更现实的学习场景,我们探索超越MLP的模型设计空间,即,Transformer骨干,提供灵活性,其中注意层管理处理和协变量之间的相互作用,以利用潜在结果的结构相似性进行混淆控制。通过仔细的模型设计,Transformers作为治疗效果估计器(transTEE)的建议。我们的经验表明,TransTEE可以:(1)作为一种通用的治疗效果估计器,在各种具有挑战性的TEE问题(例如,离散的、连续的、结构化的或与剂量相关的治疗),并且适用于协变量是表格的以及它们由结构数据组成的情况(例如,文本、图表);(2)产生多个优点:与倾向评分建模的兼容性、参数效率、对连续处理值分布偏移的鲁棒性、在协变量调整中的可解释性以及在审计预训练的语言模型中的现实效用

英文摘要:

Previous works on Treatment Effect Estimation (TEE) are not in widespread use because they are predominantly theoretical, where strong parametric assumptions are made but untractable for practical application. Recent work uses multilayer perceptron (MLP) for modeling casual relationships, however, MLPs lag far behind recent advances in ML methodology, which limits their applicability and generalizability. To extend beyond the single domain formulation and towards more realistic learning scenarios, we explore model design spaces beyond MLPs, i.e., transformer backbones, which provide flexibility where attention layers govern interactions among treatments and covariates to exploit structural similarities of potential outcomes for confounding control. Through careful model design, Transformers as Treatment Effect Estimators (TransTEE) is proposed. We show empirically that TransTEE can: (1) serve as a general purpose treatment effect estimator that significantly outperforms competitive baselines in a variety of challenging TEE problems (e.g., discrete, continuous, structured, or dosage-associated treatments) and is applicable to both when covariates are tabular and when they consist of structural data (e.g., texts, graphs); (2) yield multiple advantages: compatibility with propensity score modeling, parameter efficiency, robustness to continuous treatment value distribution shifts, explainable in covariate adjustment, and real-world utility in auditing pre-trained language models

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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