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Koki Okajima

4 papers hereh-index 211 citations5 works total

Matching runs newest-first, so older work may not be attached to this profile yet.

author position
  • first author3
  • last author1

Across the 4 of 4 papers where every author was matched, so the position is known.

fields
  • cs.IR2
  • cond-mat.dis-nn1
  • stat.ML1
same name
  • Koki Okajima — 2 papers, h 3

Either other researchers who publish under this name, or the same person where the external sources have not merged their records.

identity via Semantic Scholar / OpenAlex

collaborators

4 papers

cs.IR2026

Non-negative Elastic Net Decoding for Information Retrieval

Koki Okajima, Yasutoshi Ida, Tsukasa Yoshida +1

Dense retrieval has become the dominant paradigm in information retrieval, in which each document is scored against a query by the inner product of their vector embeddings, and the…

cs.IR2026

What Limits Does Quantization Place on Dense Top-k Retrieval? A Theoretical Study

Koki Okajima, Tsukasa Yoshida

We establish conditions for embedding a corpus of N documents as d-dimensional vectors such that every k-subset S⊆[N] is realizable as a result of top-k retriev…

cond-mat.dis-nn2025

On the phase diagram of extensive-rank symmetric matrix denoising beyond rotational invariance

Jean Barbier, Francesco Camilli, Justin Ko +1

Matrix denoising is central to signal processing and machine learning. Its statistical analysis when the matrix to infer has a factorised structure with a rank growing proportional…

stat.ML2025

Transfer Learning in ℓ1​ Regularized Regression: Hyperparameter Selection Strategy based on Sharp Asymptotic Analysis

Koki Okajima, Tomoyuki Obuchi

Transfer learning techniques aim to leverage information from multiple related datasets to enhance prediction quality against a target dataset. Such methods have been adopted in th…

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