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Author

Ayoub Belfatmi

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#artificial intelligence Preprint Oct 2026

Frozen Factor or Spectral Band? Disentangling Two Choices in Low-Rank LoRA

Spectral variants of low-rank adaptation (LoRA) choose both a subspace and which factor to freeze. We separate these choices by freezing the input factor A or output factor B on the top or bottom singular directions of pretrained weights, with learning rates selected separately. At rank 2, the same-band advantage of fr...

Adnan Slimane Ali, Ayoub Belfatmi, David Ngwe Pouth · 0 citations

CUSUM-Shaped Inference-Time Monitoring and Targeted Re-Decoding for Quantized Small Language Model Reasoning

MGT-B provides a modest, reproducible local improvement on MATH-500 in the studied configuration, but the effect does not transfer to Omni-MATH and should not be interpreted as a general improvement in mathematical reasoning.

E. Ettifouri, Ayoub Belfatmi, Mahaman Sanoussi Yahaya Alassan et al. · 1 citation
Jul 2026

Calibrated e-CUSUM Decoding for Quantized Reasoning Models: Why Token Log-Probability Is the Wrong Observable for Decoding Monitors

A training-free decoding controller that combines a degeneration-aware alarm score fusing token uncertainty with explicit verbatim repetition and a calibrated e-process-inspired sequential detector, and finds that non-termination, rather than looping, is the dominant failure mode on GSM8K.

E. Ettifouri, Ayoub Belfatmi, Mahaman Sanoussi Yahaya Alassan et al. · 0 citations

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