David Semedo
Ph.D. student at NOVA University of Lisbon

About Me

My name is David Semedo, and I'm a Ph.D. Student at NOVA School of Science and Technology, from the NOVA University of Lisbon. I am a researcher of the Web and Media Search group (NOVA Search), at the NOVA Laboratory for Computer Science and Informatics (NOVA LINCS). My advisor is Professor João Magalhães.

My current work focuses on Temporal Cross-modal Embeddings and Neural-based Representation Learning. In this topic, I address the semantic gap between visual and textual modalities, by modelling cross-modal data interactions over time, in embedding spaces

Expertise and Interests: Multimodal machine learning. Computer vision and natural language processing methods for video, image and text modelling. My research interests lye around the field of multimedia understanding, namely in the intersection of computer vision and NLP, Deep Neural Networks, Artificial Intelligence and Data Mining.

Academic degrees:

2016-Present Ph.D. in Computer Science at NOVA School of Science and Technology under the supervision of Prof. João Magalhães.

2015 M.Sc. in Computer Science by NOVA School of Science and Technology [Thesis] [Bib] under the supervision of Prof. Pedro Barahona and Prof. Pedro Medeiros.

2013 B.Sc. in Computer Science by NOVA School of Science and Technology.

Publications

Diachronic Cross-modal Embeddings
David Semedo, and João Magalhães. ACM Multimedia 2019, Nice, France, Oct. 2019.
[Project Page (w/ Dataset)] [PDF] [Bib]

Cross-Modal Subspace Learning with Scheduled Adaptive Margin Constraints
David Semedo, and João Magalhães. ACM Multimedia 2019, Nice, France, Oct. 2019.
[PDF] [Bib]

A Benchmark of Visual Storytelling in Social Media
Gonçalo Marcelino, David Semedo, André Mourão, Saverio Blasi, Marta Mrak, and João Magalhães. International Conference on Multimedia Retrieval 2019, Ottawa, Canada, June 2019.
[PDF] [Bib]

Dynamic-Keyword Extraction from Social Media
David Semedo, and João Magalhães. European Conference on Information Retrieval 2019, Cologne, Germany, April 2019.
[PDF] [Bib]

Temporal Cross-Media Retrieval with Soft-Smoothing
David Semedo, and João Magalhães. ACM Multimedia 2018, Seoul, Korea, Oct. 2018.
[PDF] [Bib]

TRECVID 2018: Benchmarking video activity detection, video captioning and matching, video storytelling linking and video search
Awad, George, Asad Butt, Keith Curtis, Yooyoung Lee, Jonathan Fiscus, Afzad Godil, David Joy, Andrew Delgado, Alan Smeaton, Yvette Graham, et al.. Proceedings of TRECVID 2018, 2018
[PDF] [Bib]

TRECVID 2018 Linking Task: Social Media Video Storytelling
João Magalhães, David Semedo, Saverio Blasi. TRECVID 2018.
[PDF]

Inferring User Gender from User Generated Visual Content on a Deep Semantic Space
David Semedo, Flávio Martins, and João Magalhães. 26th European Signal Processing Conference (EUSIPCO 2018), Rome, Italy, 2018.
[PDF] [Bib]

NovaSearch at ImageCLEFmed 2016 Subfigure Classification Task
David Semedo, João Magalhães. Working Notes of CLEF 2016 - Conference and Labs of the Evaluation forum, Évora, Portugal, Sep. 2016.
[PDF] [Bib]

Asynchronous Parallel Ant-Colony Optimization Strategies: Application to the Multi-Depot Vehicle Scheduling Problem with Line Exchanges
David Semedo, Pedro Barahona, Pedro Medeiros. 7th INForum, Covilhã, Portugal, Sep. 2015.
[PDF] [Bib]

Activities

Please find below a list of my most relevant academic activities, grouped by year.

2019:

  • Reviewer for ACM Multimedia 2019 (MM 2019).

2018:

  • Reviewer for ACM SIGIR Conference on Research and Development in Information Retrieval (SIGIR 2018).

  • Reviewer for ACM International Conference on Multimedia Retrieval 2018 (ICMR 2018).

  • Reviewer for International Conference on Theory and Practice of Digital Libraries 2018 (TPDL 2018).

2017:

  • Reviewer for ACM International Conference on Multimedia Retrieval 2017 (ICMR 2017).

  • Reviewer for IEEE International Conference on Multimedia and Expo 2017 (ICME 2017).

2016:

  • Reviewer for ACM International Conference on Multimedia Retrieval 2016 (ICMR 2016).

  • Monitor at the LxMLS - 2016 Lisbon Machine Learning Summer School.

  • Poster Presentation at CLEF 2016 - Conference and Labs of the Evaluation Forum.

Teaching

2018 Web Search and Data Mining - M.Sc. Computer Science course. [Webpage]

2015 Algorithms and Data Structures - B.Sc. Computer Science course.

2014 Algorithms and Data Structures - B.Sc. Electrical and Computer Engineering course.

Projects and Others

2018-Present - Visual Stories: Cross-modal Image and Video Search/Browsing Tool for Social Media Event Data (Ongoing Work) [Link]

2016 - Classical and Neural Language Models Survey [PDF]
Statistical Learning Course final project, lectured by Prof. Mário Figueiredo