Core Concepts
CoLiDE proposes a novel approach for learning linear DAGs by simultaneously estimating the structure and exogenous noise levels, outperforming existing methods.
Abstract
ABSTRACT:
CoLiDE introduces a new convex score function for sparsity-aware learning of linear DAGs.
The method efficiently explores the space of DAGs without requiring manual hyperparameter tuning.
CoLiDE exhibits enhanced stability and robustness in heterogeneous noise scenarios.
INTRODUCTION:
Directed acyclic graphs (DAGs) encode causal relationships within complex systems.
Inferring DAGs from observational data poses computational challenges due to the acyclicity constraint.
RELATED WORK:
Continuous relaxation approaches offer efficient exploration of the space of DAGs.
Order-based methods exploit equivalence between exact DAGs and upper-triangular weight matrices.
CONCOMITANT LINEAR DAG ESTIMATION:
CoLiDE proposes variants for homoscedastic and heteroscedastic noise scenarios.
Optimization involves solving unconstrained problems with dualized acyclicity functions.
EXPERIMENTAL RESULTS:
CoLiDE outperforms state-of-the-art methods in synthetic settings with varying noise distributions.
Superior performance is observed in both homoscedastic and heteroscedastic scenarios across different sample sizes.
REAL DATA EXPERIMENT:
CoLiDE achieves the lowest Structural Hamming Distance (SHD) on the Sachs dataset compared to other methods.
CONCLUDING SUMMARY:
CoLiDE presents a novel framework for learning linear DAGs with simultaneous noise estimation.
Future work includes extending the method to nonlinear and interventional settings.
Stats
CoLiDEは新しい凸スコア関数を導入しました。
CoLiDEは異質なノイズシナリオで他の方法を上回る性能を示します。