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Mahdi Mohammadigohari

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Preprint Aug 2026

Variation Brownian Kernel Ladders

Claims about the benefit of depth depend on the complexity assigned to a representation. We introduce the \emph{Variation Brownian Kernel Ladder} (VBKL), a path-atomic function-space framework that separates nonlinear recursive dictionary construction from linear variation superposition. Starting from linear projection...

Mahdi Mohammadigohari · 0 citations
#machine learning Preprint Aug 2026

Common Covariance Geometry and Certification for Brownian Kernel Ladders

One finite-dimensional covariance object is identified linking unrestricted kernel adaptation, Gaussian geometry, common subspaces, and certifiable computation and is identified as the minimum-trace common covariance that dominates the unrestricted empirical union generated by Brownian kernel ladders.

Mahdi Mohammadigohari · 0 citations
#machine learning Preprint Aug 2026

Sample-Weighted End-to-End Trace-Norm Geometry for Multitask Learning

The sample-size-weighted trace norm of the end-to-end map from task coefficients to input-space predictors is studied instead the sample-size-weighted trace norm of the end-to-end map from task coefficients to input-space predictors.

Mahdi Mohammadigohari · 0 citations
#machine learning Preprint Sep 2026

Brownian Heads for Deep ReLU Representations: Activation Mass and the Cost of Same-Sample Selection

This work studies the conditional empirical Rademacher complexity of deep ReLU representations followed by bounded-norm predictors in additive or L\'evy-Brownian RKHSs, termed Brownian heads, and derives an exact dual identity and sharp bounds in terms of activation mass, the average norm of the observed hidden vectors...

Mahdi Mohammadigohari, Nicole Mücke · 0 citations
#machine learning Preprint Sep 2026

Optimization Geometry of Equivalent Brownian RKHS Representations

Float64 tests over five grids numerically verify the finite identities, mapped one-layer and recursive trajectories, conditioning predictions, and theorem-matched Adam separation of a controlled finite Brownian RKHS with nodal, increment, and spectral coordinates.

Mahdi Mohammadigohari, G. Camps-Valls · 0 citations
Preprint Aug 2026

Operator-Theoretic Generalization Bounds for Multitask Deep Learning

Operator-theoretic generalization bounds for deep multi-output function classes are developed by representing network layers as Koopman composition operators on vector-valued reproducing kernel Hilbert spaces and derive Rademacher complexity bounds for invertible and width-expanding injective architectures.

Mahdi Mohammadigohari, Thomas Borsani, G. Di Fatta · 1 citation

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