{"id":723,"date":"2026-02-27T09:19:48","date_gmt":"2026-02-27T08:19:48","guid":{"rendered":"https:\/\/blogg.lnu.se\/disa\/?p=723"},"modified":"2026-03-02T11:15:55","modified_gmt":"2026-03-02T10:15:55","slug":"welcome-to-our-phd-seminar-in-march","status":"publish","type":"post","link":"https:\/\/blogg.lnu.se\/disa\/?p=723","title":{"rendered":"Welcome to our PhD-seminar in March"},"content":{"rendered":"\n

When? <\/strong>March 13, 14.00-16.00
Where? <\/strong>Onsite: D2272 and via zoom
Registration: <\/strong>Please sign up for the seminar via this link https:\/\/forms.gle\/EbRUASvY9c73kMNz6 by March 11. This is especially important if you plan to attend onsite so we can make sure there is fika for everyone<\/p>\n\n\n\n

Agenda
<\/strong>14.00-14.10 Welcome and practical information
14.10-14.55 Palme archives as a chatbot \u2013 Tibo Bruneel
14.55 \u2013 15.05 Coffee break
15.05 \u2013 15.50 Gradient Tree Boosting for Regression\u00a0Transfer\u00a0– Dag Bj\u00f6rnberg
15.50 -16.00 Sum up and plan for our upcoming seminars<\/p>\n\n\n\n

Abstracts <\/h2>\n\n\n\n

Palme archives as a chatbot \u2013 Tibo Bruneel <\/strong> 
For nearly four decades, the assassination of Swedish Prime Minister Olof Palme has remained a complex and heavily disputed case. Although the investigation officially closed in 2020, the search for answers continues within a monumental digital footprint. This dataset is a chaotic, unstructured web of typed police reports, handwritten notes, maps, and images. <\/p>\n\n\n\n

How can we potentially find previously unknown clues buried within decades of scattered data? 
This presentation introduces “PalmeNet-Chat,” an LLM-powered investigative tool developed by Softwerk AB in collaboration with the true-crime podcast Sp\u00e5r<\/em>. We will detail the technical challenge of processing this dense archive. By engineering an on-premise OCR pipeline utilising Vision Language Models, we transformed raw history into a structured, searchable library. We will then explore how we implemented Retrieval Augmented Generation (RAG) and vector databases to build a system capable of semantic search and contextual reasoning across the entire case file. Finally, we will offer a glimpse into the next phase of our project, showcasing how we are taking this investigative tool to an entirely new level. <\/p>\n\n\n\n

<\/p>\n\n\n\n

Gradient Tree Boosting for Regression\u00a0Transfer\u00a0–\u00a0Dag\u00a0Bj\u00f6rnberg\u00a0\u00a0<\/strong>
Many real-world modeling problems are hindered by limited data availability. In such cases,\u00a0transfer learning<\/em>\u00a0leverages related source domains to improve predictions in a target domain of interest. We extend the classical gradient tree boosting paradigm to a regression transfer algorithm by modeling the weak learner as a sum of two regression trees. The trees are fitted on source data and target data, respectively, and jointly\u00a0optimized\u00a0for the target data. We derive\u00a0optimal\u00a0coefficients for the model update under the least-squares, the least-absolute deviation, and the Huber loss functions. We benchmark our approach against the widely used\u00a0XGBoost\u00a0algorithm in several transfer scenarios, achieving superior performance in seven out of eight cases.\u00a0<\/p>\n\n\n\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

When? March 13, 14.00-16.00 Where? Onsite: D2272 and via zoomRegistration: Please sign up for the seminar via this link https:\/\/forms.gle\/EbRUASvY9c73kMNz6 by March 11. This is especially important if you plan to attend onsite so we can make sure there is fika for everyone Agenda14.00-14.10 Welcome and practical information14.10-14.55 Palme archives as a chatbot \u2013 Tibo Bruneel 14.55 […]<\/p>\n","protected":false},"author":19939,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[93],"tags":[],"class_list":["post-723","post","type-post","status-publish","format-standard","hentry","category-blogg"],"acf":[],"yoast_head":"\r\nWelcome to our PhD-seminar in March - DISA<\/title>\r\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\r\n<link rel=\"canonical\" href=\"https:\/\/blogg.lnu.se\/disa\/?p=723\" \/>\r\n<meta property=\"og:locale\" content=\"en_US\" \/>\r\n<meta property=\"og:type\" content=\"article\" \/>\r\n<meta property=\"og:title\" content=\"Welcome to our PhD-seminar in March - DISA\" \/>\r\n<meta property=\"og:description\" content=\"When? 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