Yoshiyuki Inagaki

Yoshiyuki Inagaki

Research Scientist
Santa Clara County , California , United States of America (USA)
Full-time On-site

About Me

Research Scientist with a strong background in Mathematics, Computer Science and Cognitive Science. Expertise includes Information Retrieval, Applied Machine Learning, and Data Mining, with experience developing machine …

Experience

Research Scientist

Yahoo! Inc., Sunnyvale, CA., USA · Sunnyvale , California , United States of America (USA)
Jun 2007 - May 2026 · 18 years 11 months

Research and development of machine learning algorithms and features for search ranking systems and abuse detection, Training/testing/deploying ranking functions for Y! Japan (Web, mobile & verticals), Training/testing/deploying classifiers for spam account detection & auction fraud detection, Research and development of a search assist system for Y! Japan (spam/gibberish query filtering, adult query filtering & query suggestion ranking), Research and development of hateful/unpleasant question/answer detection system for Yahoo! Japan Answers., Research and development of unrelated question/best-answer pair detection system for Yahoo! Japan Answers, Research and development of adult/spam detection system for Yahoo! Taiwan Answers, Research and development of bidding strategies on the advertiser's side., Research and development of Search Assist Personalization, Research and development of Query Intent Classifier for Shopping/Travel Ads, Research and development of Automated Ad Title Generation from Product Description Text

Technical Expert, Advanced System Division

Link Information System, Inc., Tokyo, Japan · Shibuya , Tokyo , Japan
Jun 2006 - May 2007 · 11 months

Research and development of algorithms for satellite/remote-sensing image analysis/enhancement., Development of evaluation tools for the “goodness” of images., Search for a set of image measurements and an appropriate function of those measures that correlates the ranking of images by human observers.

Postdoctoral Researcher & Assistant Specialist (Software R&D)

The Institute for Brain Aging and Dementia, University of California, Irvine, CA, USA · Irvine , California , United States of America (USA)
Sep 1999 - May 2006 · 6 years 8 months

Research and development of the breast cancer tissue classification system as a new feature for the image analysis system that was previously developed and implemented., The system, implemented in C++, utilizes neighborhood level information of each cell nucleus and minimal spanning tree statistics to gather/classify structural information of each tissue., Design and implementation of unsupervised texture segmentation algorithms in C++ to enhance the classification capability of the breast cancer tissue classification system., Design and implementation of the on-line EM algorithm in C++ and Java.

PROJECTS

Ad-group assignment to keyword

yahoo
Duration : 03-Jun-2024 - 15-May-2026

Lead the project following "ad-group assignment as a search" framework. Use both the relevance matching (search index building) and the semantic matching (sentence transformer) to achieve the satisfactory level of precision and recall. The ad sales team has decided to use the proposed method.

Skills

Computer Science Data Mining Java Python Transformer Hadoop Pytorch Scala Mathematics Cognitive Science Information Retrieval Applied Machine Learning Gradient Boosting Decision Trees Random Forests Topic Modeling Statistical Machine Translation (Moses) Language Modeling Maximum Entropy (MaxEnt) Skip-gram RNN LSTM GRU Sentence Transformer Neural Machine Translation Seq2seq Attention mechanism Deep Neural Auto-Encoder Generative Adversarial Networks word2vec Tensorflow MapReduce Pig MATLAB/Octave R C++
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