Area 4: Embodied Representation Learning

Many MSc projects at KTH are conducted in collaboration with industry or other universities and research institutes. I have the pleasure of examining or supervising a number of such projects every year. Such external collaborations are always stimulating, and often lead to publications and further collaboration.

Recent publications with external MSc students

• Marc Botet Colomer*, Pier Luigi Dovesi*, Theodoros Panagiotakopoulos, J. Frederico Carvalho, Linus Härenstam-Nielsen, Hossein Azizpour, Hedvig Kjellström, Daniel Cremers, and Matteo Poggi.  💀 To Adapt or Not to Adapt? Real-time adaptation for semantic segmentation. In IEEE International Conference on Computer Vision, 2023. (*Joint first authors)
  • Videos and code
• Jonathan Wenger, Hedvig Kjellström, and Rudolph Triebel. Non-parametric calibration for classification. In International Conference on Artificial Intelligence and Statistics, 2020.

This project is a collaboration with a group in veterinary biochemistry at the Swedish University of Agricultural Sciences, whose goal is to create artificial spider web - a protein based, highly durable and strong material. Our contribution to the project is to develop deep generative methods for predicting material properties  given the protein composition in the raw material.

Publications

The overarching objective is to improve our understanding of how human social behavior shapes sustainable smart city design and development through multi-level interactions between humans and cyber agents. Our key hypothesis is that human-social wellbeing is the main driver of smart city development, strongly influencing human-social choices and behaviors. This hypothesis will be substantiated through mathematical and computational modelling, which spans and links multiple scales, and tested by means of several case studies set in the Stockholm region as part of the Digital Demo Stockholm initiative.

Publications

• Carles Balsells Rodas, Ruibo Tu, and Hedvig Kjellström. Causal discovery from conditionally stationary time-series, arXiv:2110.06257, 2021.
• Andrew Karvonen, Vladimir Cvetkovic, Pawel Herman, Karl Henrik Johansson, Hedvig Kjellström, Marco Molinari, and Mikael Skoglund. The 'New Urban Science': Towards the interdisciplinary and transdisciplinary pursuit of sustainable transformations. Urban Transformations 3:9, 2021.
• Chenda Zhang and Hedvig Kjellström. A subjective model of human decision making based on Quantum Decision Theory, arXiv:2101.05851, 2021.
• Moein Sorkhei, Gustav Eje Henter, and Hedvig Kjellström. Full-Glow: Fully conditional Glow for more realistic image generation. In DAGM German Conference on Pattern Recognition, 2021.

Project homepage

This project, which is part of the SeRC eCPC MCP, is a collaboration with the Biostatistics group at the Department of Medical Epidemiology and Biostatistics. Together we develop Variational methods for more accurate prediction of survival probability.

Publications

• Benjamin Christoffersen, Behrang Mahjani, Mark Clements, Hedvig Kjellström, and Keith Humphreys. Quasi-Monte Carlo methods for binary event models with complex family data. Journal of Computational and Graphical Statistics 1-9, 2023.

• Benjamin Christoffersen, Mark Clements, Keith Humphreys, and Hedvig Kjellström. Asymptotically exact and fast Gaussian copula models for imputation of mixed data types. In Asian Conference on Machine Learning, 2021.

In this project, we aim to build an automatic image understanding system that can perform real-time robust image understanding to aid visually impaired persons.

Publications

• Marcus Klasson, Hedvig Kjellström, and Cheng Zhang. Learn the time to learn: Replay scheduling in continual learning. Transactions on Machine Learning Research 09, 2023.
• Marcus Klasson, Cheng Zhang, and Hedvig Kjellström. Using variational multi-view learning for classification of grocery items. Patterns 1(8):100143, 2020.
  • Supplementary material 
  • Dataset
• Marcus Klasson, Cheng Zhang, and Hedvig Kjellström. A hierarchical grocery store image dataset with visual and semantic labels. In IEEE Winter Conference on Applications of Computer Vision, 2019.
  • Dataset

In this project, which is part of the SeRC Data Science MCP, we develop Machine Learning methods that discover causal structures from medical data, for automatic decision support to medical doctors in their work to diagnose different types of injuries and illnesses. The purpose is to determine the underlying causes of observed symptoms and measurements, making it possible to semi-automatically reason about the potential effects of different actions, and propose suitable treatment.

Publications

• Ruibo Tu, Kun Zhang, Hedvig Kjellström, and Cheng Zhang. Optimal transport for causal discovery. In International Conference on Learning Representations, 2022.
• Xueru Zhang*, Ruibo Tu*, Yang Liu, Mingyan Liu, Hedvig Kjellström, Kun Zhang, and Cheng Zhang. How do fair decisions fare in long-term qualification? In Neural Information Processing Systems, 2020. (*Joint first authors)
  • Video 
  • Code
• Ruibo Tu, Kun Zhang, Bo Christer Bertilson, Hedvig Kjellström, and Cheng Zhang. Neuropathic pain diagnosis simulator for causal discovery algorithm evaluation. In Neural Information Processing Systems, 2019.
  • Video 
  • Code
• Cheng Zhang, Judith Bütepage, Hedvig Kjellström, and Stephan Mandt. Advances in variational inference. IEEE Transactions on Pattern Analysis and Machine Intelligence 41(8), 2019
• Charles Hamesse, Ruibo Tu, Paul Ackermann, Hedvig Kjellström, and Cheng Zhang. Simultaneous measurement imputation and outcome prediction for Achilles tendon rupture rehabilitation. In Machine Learning for Healthcare, 2019.
• Ruibo Tu, Cheng Zhang, Paul Ackermann, Karthika Mohan, Clark Glymour, Hedvig Kjellström, and Kun Zhang. Causal discovery in the presence of missing data. In International Conference on Artificial Intelligence and Statistics, 2019.
  • Code
• Cheng Zhang, Hedvig Kjellström, and Stephan Mandt. Determinantal point processes for mini-batch diversification. In Conference on Uncertainty in Artificial Intelligence, 2017.
• Cheng Zhang, Hedvig Kjellström, and Carl Henrik Ek. Inter-battery topic representation learning. In European Conference on Computer Vision, 2016.
• Cheng Zhang, Hedvig Kjellström, Carl Henrik Ek, and Bo Christer Bertilson. Diagnostic prediction using discomfort drawings with IBTM. In Machine Learning for Healthcare, 2016.

As robots become more omnipresent in our society, we are facing the challenge of making them more socially competent. However, in order to safely and meaningfully cooperate with humans, robots must be able to interact in ways that humans find intuitive and understandable. Addressing this challenge, we propose a novel approach for understanding and modelling social behaviour and implementing social coupling in robots. Our approach presents a radical departure from the classical view of social cognition as mind- reading, mentalising or maintaining internal rep-resentations of other agents. This project is based on the view that even complex modes of social interaction are grounded in basic sensorimotor interaction patterns. SensoriMotor Contingencies (SMCs) are known to be highly relevant in cognition. Our key hypothesis is that learning and mastery of action-effect contingencies are also critical to enable effective coupling of agents in social contexts. We use "socSMCs" as a shorthand for such socially relevant action-effect contingencies. We will investigate socSMCs in human-human and human-robot social interaction scenarios. The main objectives of the project are to elaborate and investigate the concept of socSMCs in terms of information-theoretic and neurocomputational models, to deploy them in the control of humanoid robots for social entrainment with humans, to elucidate the mechanisms for sustaining and exercising socSMCs in the human brain, to study their breakdown in patients with autism spectrum disorders, and to benchmark the socSMCs approach in several demonstrator scenarios. Our long term vision is to realize a new socially competent robot technology grounded in novel insights into mechanisms of functional and dysfunctional social behavior, and to test novel aspects and strategies for human-robot interaction and cooperation that can be applied in a multitude of assistive roles relying on highly compact computational solutions.

My part of the project comprised human motion and activity forecasting.

Publications

• Judith Bütepage, Hedvig Kjellström, and Danica Kragic. Anticipating many futures: Online human motion prediction and synthesis for human-robot collaboration. In IEEE International Conference on Robotics and Automation, 2018.
• Judith Bütepage, Michael J. Black, Danica Kragic, and Hedvig Kjellström. Deep representation learning for human motion prediction and classification. In IEEE Conference on Computer Vision and Pattern Recognition, 2017.

In parallel to the massive increase of text data available on the Internet, there has been a corresponding increase in the amount of available surveillance video. There are good and bad aspects of this. One undeniably positive aspect is that it is possible to gather evidence from surveillance video when investigating crimes or the causes of accidents; forensic video analysis. Forensic video investigations are now carried out manually. This involves a huge and very tedious effort; e.g., 60 000 hours of video in the Breivik investigation. The amount of surveillance data is also constantly growing. This means that in future investigations, it will no longer be possible to go through all the evidence manually. The solution is to automate parts of the process. In this project we propose to learn an event model from surveillance data, that can be used to characterize all events in a new set of surveillance recorded from a camera network. Our model will also represent the causal dependencies and correlations between events. Using this model, or explanation, of the data from the network, a semi-automated forensic video analysis tool with a human in the loop will be designed, where the user chooses a certain event, e.g., a certain individual getting off a train, and the system returns all earlier observations of this individual, or all other instances of people getting off trains, or all the events that may have caused or are correlated with the given "person getting off train" event.
There are two activities in this project, development of methods for image retrieval, and development of core topic model methodologies for video classification.

Publications

• David Geronimo and Hedvig Kjellström. Unsupervised surveillance video retrieval based on human action and appearance. In IAPR International Conference on Pattern Recognition, 2014.
• Cheng Zhang, Carl Henrik Ek, Andreas Damianou, and Hedvig Kjellström. Factorized topic models. In International Conference on Learning Representations, 2013.

Robohow aims at enabling robots to competently perform everyday human-scale manipulation activities - both in human working and living environments. In order to achieve this goal, Robohow pursues a knowledge-enabled and plan-based approach to robot programming and control. The vision of the project is that of a cognitive robot that autonomously performs complex everyday manipulation tasks and extends its repertoire of such by acquiring new skills using web-enabled and experience-based learning as well as by observing humans.

My part of the project comprised object tracking and visuo-haptic object exploration.

Publications

• Sergio Caccamo, Püren Güler, Hedvig Kjellström, and Danica Kragic. Active perception and modeling of deformable surfaces using Gaussian processes and position-based dynamics. In IEEE-RAS International Conference on Humanoid Robots, 2016.
• Alessandro Pieropan, Niklas Bergström, Masatoshi Ishikawa, Danica Kragic, and Hedvig Kjellström. Robust tracking of unknown objects through adaptive size estimation and appearance learning. In IEEE International Conference on Robotics and Automation, 2016.
• Alessandro Pieropan, Niklas Bergström, Masatoshi Ishikawa, and Hedvig Kjellström. Robust and adaptive keypoint-based object tracking. Advanced Robotics 30(4), 2016.
• Püren Güler, Karl Pauwels, Alessandro Pieropan, Hedvig Kjellström, and Danica Kragic. Estimating the deformability of elastic materials using optical flow and position-based dynamics. In IEEE-RAS International Conference on Humanoid Robots, 2015.

The aim of TOMSY is to enable a generational leap in the techniques and scalability of motion synthesis algorithms. We propose to do this by learning and exploiting appropriate topological representations and testing them on challenging domains of flexible, multi-object manipulation and close contact robot control and computer animation. Traditional motion planning algorithms have struggled to cope with both the dimensionality of the state and action space and generalisability of solutions in such domains. This proposal builds on existing geometric notions of topological metrics and uses data driven methods to discover multi-scale mappings that capture key invariances - blending between symbolic, discrete and continuous latent space representations. We will develop methods for sensing, planning and control using such representations.

Publications

• Alessandro Pieropan, Carl Henrik Ek, and Hedvig Kjellström. Recognizing object affordances in terms of spatio-temporal object-object relationships. In IEEE-RAS International Conference on Humanoid Robots, 2014.
• Alessandro Pieropan, Giampiero Salvi, Karl Pauwels, and Hedvig Kjellström. Audio-visual classification and detection of human manipulation actions. In IEEE/RSJ International Conference on Intelligent Robots and Systems, 2014.
  • Dataset
  • Video
• Alessandro Pieropan and Hedvig Kjellström. Unsupervised object exploration using context. In IEEE International Symposium on Robot and Human Interactive Communication, 2014.
• Javier Romero, Thomas Feix, Carl Henrik Ek, Hedvig Kjellström, and Danica Kragic. Extracting postural synergies for robotic grasping. IEEE Transactions on Robotics, 29(6), 2013.
  • Video
• Cheng Zhang, Dan Song, and Hedvig Kjellström. Contextual modeling with labeled multi-LDA. In IEEE/RSJ International Conference on Intelligent Robots and Systems, 2013.
• Javier Romero, Hedvig Kjellström, Carl Henrik Ek, and Danica Kragic. Non-parametric hand pose estimation with object context. Image and Vision Computing, 31(8), 2013.
• Alessandro Pieropan, Carl Henrik Ek, and Hedvig Kjellström. Functional object descriptors for human activity modeling. In IEEE International Conference on Robotics and Automation, 2013.
  • Video
• Martin Hjelm, Carl Henrik Ek, Renaud Detry, Hedvig Kjellström, and Danica Kragic. Sparse summarization of robotic grasp data. In IEEE International Conference on Robotics and Automation, 2013.
• Akshaya Thippur, Carl Henrik Ek, and Hedvig Kjellström. Inferring hand pose: A comparative study of visual shape features. In IEEE International Conference on Automatic Face and Gesture Recognition, 2013.
• Florian T. Pokorny, Carl Henrik Ek, Hedvig Kjellström, and Danica Kragic. Persistent homology for learning densities with bounded support. In Advances in Neural Information Processing Systems 25, 2012.

The EU project PACO-PLUS brings together an interdisciplinary research team to design and build cognitive robots capable of developing perceptual, behavioural and cognitive categories that can be used, communicated and shared with other humans and artificial agents. In my part of the project, we are interested in programming by demonstration applications, in which a robot learns how to perform a task by watching a human do the same task. This involves learning about the scene, objects in the scene, and actions performed on those objects. It also involves learning grammatical structures of actions and objects involved in a task.

Publications

• Javier Romero, Hedvig Kjellström, Carl Henrik Ek, and Danica Kragic. Non-parametric hand pose estimation with object context. Image and Vision Computing 31(8), 2013.
• Hedvig Kjellström, Javier Romero, and Danica Kragic. Visual object-action recognition: Inferring object affordances from human demonstration. Computer Vision and Image Understanding 115, 2011.