REVIEW 3 major objections 8 minor 74 references
Steering Neural Network Training through Interpretable Constraints Based on Partial Dependence
T0 review · 3 major / 8 minor · reviewed 2026-07-10 · glm-5.2
Pith's one-line read Constrain the average response, not the full function
desk verdict PD-constraint method for regression is solid and novel; the extrapolation story has a real soft spot worth addressing read the letter →
The pith
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
The reading
What carries the argument
The partial dependence of a model h on a feature subset x_k is the expectation of h(x_k, x_{-k}) over the marginal distribution of the complementary features x_{-k}. The method minimizes a weighted sum of the standard prediction loss and a PD-matching loss (Eq. 7–8), alternating between updating the network parameters theta and the prior function parameters phi. A separate dataset LS_PD of constraint points x_k can be drawn either from the training distribution or as evenly spaced values across the input domain.
What would settle it
On a regression problem where the true partial dependence on the constrained features is not representable by the chosen parametric family and does not even approximately match it, the constrained model should perform no better than an unconstrained baseline in both prediction error and PD fidelity. The paper's own mis-specification experiment (Appendix C) tests only cases where the wrong form still reasonably approximates the true one.
Extended reading notes
Core claim
A neural network can be steered during training so that its partial dependence on selected features matches a known functional form, and when the constraint is applied over an evenly spaced grid rather than only at observed data points, the resulting model is simultaneously more accurate, more data-efficient, and more faithful to the injected knowledge — especially in extrapolation regimes where unconstrained models and in-distribution constraints fail.
Load-bearing premise
The method assumes that the partial dependence of the target function on the selected features is well-approximated by a known parametric form (a function of x_k plus scaling and bias constants). If the true PD involves complex interactions that cannot be captured by such a form, the constraint is mis-specified and may not help.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper introduces a method for steering neural network training by constraining the partial dependence (PD) of the model on selected features to align with a known functional form. The authors formulate a penalized objective (Eq. 7) that balances standard mean-squared error with a PD-matching loss, and propose an alternating optimization algorithm (Algorithm 1). The method is evaluated on synthetic regression problems (Friedman, Product), real-world datasets (Concrete, PHALK), and a dynamical systems forecasting task (damped pendulum). The authors compare four configurations (ground-truth vs. approximated prior; in-distribution vs. linspace constraint) against unconstrained training and physics-informed baselines, finding that constrained models are more data-efficient, generalize better under domain shift, and yield PD estimates more faithful to prior knowledge.
Significance. The paper addresses a genuine gap in explanation-guided learning (EGL): most prior work targets classification with feature-importance priors, whereas this work targets regression with functional-form priors on partial dependence. The formulation is clean and the relaxation from hard constraint (Eq. 5) to penalized objective (Eq. 7) is standard and well-motivated. The distinction between in-distribution and linspace constraining is a useful practical contribution, and the extension to dynamical systems (Appendix A.2) broadens applicability. The empirical coverage is commendable: synthetic problems with known ground truth, two real-world datasets, a dynamical system, and a comparison to physics-informed hybrid models (Appendix B). The mis-specification analysis (Appendix C) is a thoughtful addition that few papers in this area include.
major comments (3)
- Appendix C.2 constrains the Concrete dataset with a square-root PD (genuinely mis-specified, since the assumed true relationship is logarithmic) and reports that extrapolation performance is 'very close to that of models constrained with the logarithmic PD' and that linspace constraining 'reaches performance close to that obtained in the interpolation setting, even though prior knowledge is fundamentally mis-specified.' This directly implies that the extrapolation benefit stems partly from the regularization effect of imposing any smooth constraint on the PD, not specifically from correct domain knowledge. If wrong knowledge helps as much as right knowledge in the regime the paper emphasizes most (extrapolation with scarce data), the claimed mechanism—that performance gains come from correct knowledge alignment—is not fully supported. The authors should either (a) soften the causal claim
- On real-world datasets (§4.3, §4.4), claim (2) that 'interpretations align with user-provided knowledge' is partly circular: the PD is constrained to be logarithmic and then observed to be logarithmic. This is acknowledged implicitly by the absence of L_PD measurements on these datasets. The authors should clarify that on real-world data, only predictive performance is independently verifiable, while PD faithfulness is a consequence of the constraint by construction, not an independent validation of the prior.
- The method assumes the PD of the target function on the selected features is well-approximated by a known parametric form h_phi_k(x_k) (Eq. 3, §3.1). The derivation of Eq. 3 covers purely additive and purely multiplicative cases, but many real-world interactions do not decompose so cleanly. The paper does not discuss what happens when the true PD is not separable into a parametric form of x_k plus a constant. Appendix C shows robustness to mis-specification only for cases where the wrong form still reasonably approximates the true one (Fourier series for sine, square root for logarithm). A brief discussion of the failure mode—when the assumed form is structurally incompatible—would strengthen the paper.
minor comments (8)
- §3.2, Algorithm 1: the notation for the alternating schedule (s, r) is somewhat opaque. A brief inline comment explaining that S controls the frequency of phi-updates would help readers.
- §4.1, Figure 1: the y-axis label 'L_PD' lacks units/scale context. Figure 4 uses '×10^2' while Figure 1 does not; readers may miscompare across experiments.
- §4.3: the choice of logarithmic PD for age is attributed to Yeh (1998a), but the citation is to a neural network modeling paper. A more direct citation for the logarithmic relationship between concrete age and compressive strength would be appropriate.
- Appendix A.2.1: the redefinition of h_phi_k to map (x_0, x_1) -> (x_1, ...) is introduced abruptly. A sentence explaining that the PD constraint applies to the second component (acceleration) while the first component (velocity) is needed for trajectory integration would improve clarity.
- The term 'linspace constraint' is used throughout but defined only in §3.3. Using it in §4 before readers reach the definition could cause confusion; a forward reference or brief gloss at first use in §4 would help.
- Figure 9 (top row, 25 samples): the PD estimates for unconstrained models are described as 'diverging' but the visual scale makes it hard to distinguish from constrained models. Consider using a shared y-axis range or adding a zoomed inset.
- References: the PHALK dataset citation (Catalan et al., 2025; Batalla et al., 2026) lists a 2026 date for the introductory paper, which appears to be a future date. Please verify.
- §3.3: the distinction between LS and LS_PD is important but the notation is dense. A small worked example showing how LS_PD points are sampled for a 2D PD (e.g., the 25×25 grid mentioned in §4) would aid reproducibility.
Circularity Check
No circularity found; derivation is self-contained and empirically validated against external benchmarks.
full rationale
The paper's method defines a composite loss (Eq. 7) combining standard MSE (Eq. 6) with a PD-alignment penalty (Eq. 8). The PD is a well-defined functional of the model h_θ computed via Eq. 2, and the constraint function h_ϕ_k is either given ground-truth parameters (ϕ=ϕ*) or learned from raw outputs via Eq. 9. On synthetic problems (Friedman, Product, Pendulum), the evaluation metric L_PD is computed with ground-truth ϕ* that is independent of the fitted model, so there is no fitted-input-as-prediction circularity. On real-world datasets (Concrete, PHALK), the paper explicitly states it 'cannot measure L_PD' because ground truth is unknown, so it only reports L_tot—no circular claim of PD alignment is made there. The self-citation to Claes et al. (2025) appears only as a baseline comparison method (PD hybrid) in Appendix B, not as a load-bearing premise for the main derivation. The Appendix C.2 finding that mis-specified (square-root) priors still help in extrapolation is a legitimate scientific concern about mechanism attribution, but it is not circularity: the paper is transparent about the mis-specification and reports it honestly. The derivation chain from problem statement (Eq. 4-5) through relaxation (Eq. 7-8) to algorithm (Algorithm 1) contains no step where an output is defined in terms of itself.
Assumptions & free parameters
free parameters (6)
- lambda =
selected from {0.25, 0.5, 0.75}
- tau_2 =
selected from {5e-2, 5e-3, 5e-4}
- tau_1 =
1
- S =
50
- E =
1000
- phi (approximated prior) =
learned during training
assumptions (3)
- domain assumption The partial dependence of the target function on the selected features can be expressed as a parametric function h_phi_k(x_k) with scaling and bias constants (Eq. 3).
- domain assumption Gradient descent on the relaxed objective (Eq. 7) converges to a solution that approximately satisfies the PD constraint while minimizing prediction error.
- domain assumption The partial dependence estimator PD_N (Eq. 2) is a sufficiently accurate approximation of PD_infty (Eq. 1) for the training set sizes used.
Cite this review
Pith. "Pith review of Steering Neural Network Training through Interpretable Constraints Based on Partial Dependence." pith.science (2026). https://pith.science/paper/VQMTHEQO
@misc{pith2026260708641,
author = {Pith},
title = {Pith review of: Steering Neural Network Training through Interpretable Constraints Based on Partial Dependence},
year = {2026},
howpublished = {\url{https://pith.science/paper/VQMTHEQO}},
note = {Machine review of arXiv:2607.08641}
}
read the original abstract
Over the last few years, there has been an increased interest in making machine learning models more interpretable. Although a great deal of effort goes into developing techniques for interpreting the interactions learned by a given model, fewer studies focus on assessing the quality of such explanations. Even fewer focus on how to adjust the model to produce explanations faithful to prior knowledge, a process known as explanation-guided learning. Furthermore, most approaches in this area focus on classification problems and usually assume prior knowledge about which input features or regions are most important. In this work, we introduce a new approach to steering neural networks based on partial dependence, such that their average response to certain features aligns with specific functional domain knowledge about the problem. We empirically demonstrate on a range of regression problems, including dynamical systems forecasting, that models whose training has been controlled using our method perform better than unconstrained models and are more data-efficient. Moreover, we highlight that interpretations obtained from the former actually align with the user-provided knowledge, whereas those obtained from the latter do not.
Figures
Figures from the paper (31 more)
Reference graph
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Reviewed July 10, 2026 · model on record in the stance chip above.
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