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P. Ferragina

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Jul 2026

Extended Depth-First Representations of k2-trees

It is demonstrated that depth-first layouts of $k^2$-trees provide a practical and efficient alternative to traditional layouts, improving both compression and computational performance in matrix operations.

Gabriel Carmona, P. Ferragina, Giovanni Manzini et al. · 0 citations
#natural language process... Preprint Sep 2026

CodeGraph: Open-Taxonomy Knowledge Graph for Source Code with Wikidata Grounding

Public software repositories, like GitHub and Software Heritage Archive, store billions of files, yet extracting their implicit engineering knowledge ---i.e., the algorithms they implement, the paradigms they follow, the patterns they instantiate, and the application domains they serve--- remains challenging, as curren...

Federico Pennino, Andrea Gurioli, Stefano Zacchiroli et al. · 0 citations
Conference Open access 2026

Oblivious Complex Queries on Variable-Length Strings

A practical design that combines Ring ORAM to hide access patterns to outsourced data, with a Patricia trie for space-efficient search over variable-length strings to support search over variable-length string datasets in an ORAM scenario, while retaining efficient storage and access both on the client and the server i...

Mariagiovanna Rotundo, Giuseppe Persiano, P. Ferragina · 0 citations
Conference Open access 2026

Achieving Obliviousness in Compressed Data Structures

The first oblivious implementations of Rank and Select that require only a single ORAM access per operation, use O(1) client-side space, and add negligible client computation overhead are presented.

Mariagiovanna Rotundo, P. Ferragina · 0 citations
Preprint Aug 2026

Diffuse to Compress: Leveraging Diffusion LMs for Lossless Compression

It is argued that replacing autoregressive LLMs with DLMs within the same compression framework could overcome the throughput bottleneck caused by their one-symbol-per-step limitation, and the newly proposed DLM-based framework advances the state of the art in lossless text compression.

Angelo Nardone, P. Ferragina · 0 citations

LLM-based Source Code Compression via Thresholded Symbol Ranking

This work introduces LLM-based compressors deploying two novel symbol-ranking variants that bound predictions to the top-$T$ ranks, and conducts the first large-scale evaluation of LLM-based source code compression across 30 LLMs, including general-domain, code-specialized, and quantized models.

Angelo Nardone, P. Ferragina · 0 citations

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