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Matteo Attimonelli

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#machine learning Review Sep 2026

Data Processing for Offline Evaluation in Recommender Systems: a Survey

A systematic, cross-domain characterisation of data processing practices for the offline evaluation of recommender systems is provided, identifying substantial heterogeneity in how auxiliary information is prepared and represented, as well as inconsistencies in the specification of data splitting protocols.

Alberto Carlo Maria Mancino, Angela Di Fazio, Danilo Danese et al. · 0 citations
Preprint Aug 2026

PUMA: Post-Hoc Sparsification of Universal Multimodal Embeddings for Efficient Retrieval

PUMA, a sparse autoencoder recipe that maps universal multimodal embeddings to compact sparse codes without retraining the backbone, reduces vector storage by 8-16x (FP32) and is up to 25x faster than exact dense scoring on larger candidate pools, enabling efficient multimodal retrieval.

Matteo Attimonelli, Alessandro De Bellis, Franco Maria Nardini et al. · 0 citations
Preprint Aug 2026

Grounding Free-Form Instructions for Fashion Complementary Image Generation

StyleFlow instantiates the task with StyleFlow, a Rectified Flow Matching model that jointly conditions on the seed image and instruction within a single multimodal transformer, and consistently produces instruction-aligned and stylistically coherent garments while reducing architectural complexity and inference cost r...

Matteo Attimonelli, Claudio Pomo, Alessandro De Bellis et al. · 0 citations

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