torch_geometric.nn.functional.gini
- gini(w: Tensor) Tensor [source]
The Gini coefficient from the “Improving Molecular Graph Neural Network Explainability with Orthonormalization and Induced Sparsity” paper.
Computes a regularization penalty \(\in [0, 1]\) for each row of a matrix according to
\[\mathcal{L}_\textrm{Gini}^i = \sum_j^n \sum_{j'}^n \frac{|w_{ij} - w_{ij'}|}{2 (n^2 - n)\bar{w_i}}\]and returns an average over all rows.
- Parameters:
w (torch.Tensor) – A two-dimensional tensor.