Neural Additive and Basis Models with Feature Selection and Interactions
Pith reviewed 2026-06-26 18:03 UTC · model grok-4.3
The pith
Adding a learnable feature selection layer to neural additive and basis models reduces computation while enabling interactions on high-dimensional data.
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
Incorporating a feature selection layer into NAM and NBM, with selection weights updated during training, resolves the computational bottlenecks of the original models, reduces costs and sizes, permits two-input networks for feature interactions even on high-dimensional data, and produces performance that is better than or comparable to state-of-the-art GAMs.
What carries the argument
Feature selection layer whose weights are updated during training to retain relevant features and pairs.
If this is right
- Computational resources and model sizes decrease compared with vanilla NAM and NBM.
- Two-input networks can be used to capture feature interactions on high-dimensional inputs.
- Accuracy is better than or comparable to current state-of-the-art GAMs.
- Interpretability is retained through the additive GAM structure.
Where Pith is reading between the lines
- The same selection layer could be inserted into other additive or basis models to improve scalability.
- Automatic pair selection removes the need for exhaustive enumeration of all possible interactions.
- The approach may generalize to other neural architectures that currently face similar dimensionality barriers.
Load-bearing premise
The learned selection weights reliably pick the important features and interactions without bias or the need for per-dataset retuning.
What would settle it
On a high-dimensional dataset whose ground-truth relevant features and interactions are known, the models select the wrong subset and lose accuracy relative to the unselected versions.
Figures
read the original abstract
Deep neural networks (DNNs) exhibit attractive performance in various fields but often suffer from low interpretability. The neural additive model (NAM) and its variant called the neural basis model (NBM) use neural networks (NNs) as nonlinear shape functions in generalized additive models (GAMs). Both models are highly interpretable and exhibit good performance and flexibility for NN training. NAM and NBM can provide and visualize the contribution of each feature to the prediction owing to GAM-based architectures. However, when using two-input NNs to consider feature interactions or when applying them to high-dimensional datasets, training NAM and NBM becomes intractable due to the increase in the computational resources required. This paper proposes incorporating the feature selection mechanism into NAM and NBM to resolve computational bottlenecks. We introduce the feature selection layer in both models and update the selection weights during training. Our method is simple and can reduce computational costs and model sizes compared to vanilla NAM and NBM. In addition, it enables us to use two-input NNs even in high-dimensional datasets and capture feature interactions. We demonstrate that the proposed models are computationally efficient compared to vanilla NAM and NBM, and they exhibit better or comparable performance with state-of-the-art GAMs.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper proposes adding a differentiable feature selection layer (with weights updated during training) to Neural Additive Models (NAM) and Neural Basis Models (NBM). This is claimed to resolve computational intractability when using two-input networks for feature interactions or when scaling to high-dimensional data, while preserving interpretability, reducing model size and training cost relative to vanilla NAM/NBM, and achieving performance that is better or comparable to state-of-the-art GAMs.
Significance. If the selection mechanism can be shown to prune irrelevant features and interactions reliably without dataset-specific tuning or selection bias, the work would meaningfully extend the practical reach of interpretable additive models to higher-dimensional regimes where two-input networks were previously infeasible.
major comments (3)
- [Abstract / Method] The abstract and method description provide no equations or pseudocode for the selection layer, the precise form of the selection weights, the loss term (or regularization schedule) that drives sparsity, or the update rule. This information is load-bearing for the central claim that the mechanism reliably identifies relevant features/interactions without introducing bias or requiring per-dataset hyperparameter search.
- [Experiments] No experimental protocol, datasets, baselines, error bars, or ablation on the selection weights is described. Without these, it is impossible to assess whether the reported efficiency gains and performance parity hold or whether they depend on favorable hyperparameter choices that undermine the "simple and general" claim.
- [Method] The skeptic concern is not addressed: if the selection weights are learned via a plain differentiable gate without explicit sparsity or stability penalties, they can latch onto spurious correlations. The manuscript must demonstrate (via controlled experiments or theoretical argument) that this does not occur on the high-dimensional regimes it targets.
minor comments (2)
- [Method] Notation for the selection weights and their integration into the additive structure should be introduced with an equation rather than prose only.
- [Abstract] The abstract states "better or comparable performance with state-of-the-art GAMs" without naming the specific GAM baselines or reporting quantitative differences.
Simulated Author's Rebuttal
We thank the referee for the constructive feedback. The comments identify key areas where additional detail and evidence are needed to support the central claims. We address each point below and commit to revisions that incorporate the requested clarifications and demonstrations.
read point-by-point responses
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Referee: [Abstract / Method] The abstract and method description provide no equations or pseudocode for the selection layer, the precise form of the selection weights, the loss term (or regularization schedule) that drives sparsity, or the update rule. This information is load-bearing for the central claim that the mechanism reliably identifies relevant features/interactions without introducing bias or requiring per-dataset hyperparameter search.
Authors: We agree that the current description is insufficiently precise. In the revised manuscript we will insert the explicit equations for the feature selection layer (including the trainable weights, their transformation, and integration into the NAM/NBM forward pass), the sparsity-inducing regularization term and its annealing schedule, and the gradient-based update rule. These additions will make the mechanism fully reproducible and allow direct evaluation of whether it avoids bias or per-dataset tuning. revision: yes
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Referee: [Experiments] No experimental protocol, datasets, baselines, error bars, or ablation on the selection weights is described. Without these, it is impossible to assess whether the reported efficiency gains and performance parity hold or whether they depend on favorable hyperparameter choices that undermine the "simple and general" claim.
Authors: The manuscript reports efficiency and performance results, yet we acknowledge that the experimental protocol, dataset specifications, baseline implementations, error bars, and ablations on the selection weights are not presented at the required level of detail. The revision will expand the experimental section with complete protocols, the full list of datasets and baselines, statistical error bars across multiple runs, and dedicated ablations that vary the selection regularization strength to demonstrate robustness. revision: yes
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Referee: [Method] The skeptic concern is not addressed: if the selection weights are learned via a plain differentiable gate without explicit sparsity or stability penalties, they can latch onto spurious correlations. The manuscript must demonstrate (via controlled experiments or theoretical argument) that this does not occur on the high-dimensional regimes it targets.
Authors: We recognize the validity of this concern. Our approach includes an explicit sparsity regularization term on the selection weights, but the manuscript does not yet contain controlled experiments isolating spurious-feature behavior. The revision will add synthetic high-dimensional experiments with known ground-truth relevant and irrelevant features, together with quantitative metrics of selection accuracy, to show that the learned weights reliably recover the relevant set without latching onto noise. revision: yes
Circularity Check
No circularity detected in model proposal or claims
full rationale
The paper proposes an architectural extension (feature selection layer with trainable weights) to NAM/NBM and reports empirical efficiency and accuracy gains. No derivation chain, uniqueness theorem, fitted parameter renamed as prediction, or self-citation load-bearing step is present. Claims rest on experimental comparisons rather than any quantity that reduces to its own inputs by construction. This is the normal case of an applied modeling paper whose central results are externally falsifiable via replication on held-out data.
Axiom & Free-Parameter Ledger
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