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<span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); font-weight: 400;">Dear colleagues, </span></p>
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<span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); font-weight: 400;"><br>
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<span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); font-weight: 400;">We cordially invite you to participate in our
</span><span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); font-weight: 700; font-style: italic;">ICCV’2021 Understanding Social Behavior in Dyadic and Small Group Interactions Challenge -
</span><a href="http://chalearnlap.cvc.uab.es/challenge/45/description/"><span style="font-size: 10pt; font-family: Arial; color: rgb(17, 85, 204); font-weight: 400; text-decoration: underline; text-decoration-skip-ink: none;">http://chalearnlap.cvc.uab.es/challenge/45/description/</span></a><span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); font-weight: 400;"> </span></p>
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<span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-weight: 400; text-decoration: underline; text-decoration-skip-ink: none;">Description:</span><span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-weight: 400;"> to
advance and motivate the research on visual human behavior analysis in dyadic and small group interactions, this challenge will use a large scale, multimodal, and multiview (</span><a href="https://openaccess.thecvf.com/content/WACV2021W/HBU/papers/Palmero_Context-Aware_Personality_Inference_in_Dyadic_Scenarios_Introducing_the_UDIVA_Dataset_WACVW_2021_paper.pdf"><span style="font-size: 10pt; font-family: Arial; color: rgb(17, 85, 204); background-color: rgb(255, 255, 255); font-weight: 400; text-decoration: underline; text-decoration-skip-ink: none;">UDIVA</span></a><span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-weight: 400;">)
dataset recently collected by our group, which provides many related challenges. It will address two different problems, divided in two competition tracks:</span></p>
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<span style="background-color: rgb(255, 255, 255); font-weight: 700;">Automatic self-reported personality recognition
</span><span style="background-color: rgb(255, 255, 255);">of single individuals (i.e., a target person) during a dyadic interaction, from two individual views. </span></p>
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<span style="background-color: rgb(255, 255, 255); font-weight: 700;">Behavior forecasting:</span><span style="background-color: rgb(255, 255, 255);"> the focus of this track will be to estimate future (up to N frames) 2D facial landmarks, hand, and upper body
pose of a target individual in a dyadic interaction.</span></p>
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<span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-weight: 400;">In both tasks, multiview and multimodal information (audio-visual, transcriptions, context and medatada) are expected to be exploited
to solve the problem.</span></p>
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<span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-weight: 400; text-decoration: underline; text-decoration-skip-ink: none;">Important Dates:</span></p>
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<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="background-color: rgb(255, 255, 255); font-weight: 700;">Dataset access request period open:</span><span style="background-color: rgb(255, 255, 255);"> 18th May, 2021</span></p>
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<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="background-color: rgb(255, 255, 255); font-weight: 700;">Start of the Challenge (development phase):
</span><span style="background-color: rgb(255, 255, 255);">June 1st, 2021</span></p>
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<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="background-color: rgb(255, 255, 255); font-weight: 700;">Start of test phase:
</span><span style="background-color: rgb(255, 255, 255);">September 1st, 2021</span></p>
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<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="background-color: rgb(255, 255, 255); font-weight: 700;">End of the Challenge:
</span><span style="background-color: rgb(255, 255, 255);">September 17th, 2021</span></p>
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<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="background-color: rgb(255, 255, 255); font-weight: 700;">Release of final results:
</span><span style="background-color: rgb(255, 255, 255);">September 30th, 2021</span></p>
</li></ul>
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<span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-weight: 400;">Top winning solutions will be invited to give a talk to present their work at the associated ICCV 2021 ChaLearn workshop (</span><a href="http://chalearnlap.cvc.uab.es/workshop/44/description/"><span style="font-size: 10pt; font-family: Arial; color: rgb(17, 85, 204); background-color: rgb(255, 255, 255); font-weight: 400; text-decoration: underline; text-decoration-skip-ink: none;">http://chalearnlap.cvc.uab.es/workshop/44/description/</span></a><span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-weight: 400;">).
In addition to this, challenge participants, as well as the research community in the field and from related disciplines (e.g. affective computing, social signal processing and human-computer interaction), are invited to submit a paper to be published in
</span><span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-weight: 700;">Proceedings of Machine Learning Research (PMLR)</span><span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-weight: 400;">.
In line with these, we accept papers addressing the issues related to, but not limited to, these topics:</span></p>
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<p dir="ltr" style="line-height:1.38;margin-top:12pt;margin-bottom:0pt"><span>Challenge related papers, describing their methods and results;</span></p>
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<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="background-color: rgb(255, 255, 255);">Detection, understanding, modeling and synthesis of individual and interpersonal social signals and dynamics;</span></p>
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<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="background-color: rgb(255, 255, 255);">Verbal/nonverbal communication analysis in dyadic and small groups;</span></p>
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<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="background-color: rgb(255, 255, 255);">Contextual analysis in dyadic and small groups;</span></p>
</li><li dir="ltr" style="font-size: 10pt; font-family: Arial; font-weight: 400; color: rgb(0, 0, 0);">
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="background-color: rgb(255, 255, 255);">Datasets, annotation protocols, and bias discovering/mitigation in dyadic and small groups;</span></p>
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<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:12pt"><span style="background-color: rgb(255, 255, 255);">Interpretability/explainability in dyadic and small groups;</span></p>
</li></ul>
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<span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-weight: 400; text-decoration: underline; text-decoration-skip-ink: none;">Important Dates:</span></p>
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<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="background-color: rgb(255, 255, 255);">Paper submission deadline (PMLR):</span><span style="background-color: rgb(255, 255, 255); font-weight: 400;"> October 31st, 2021</span></p>
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<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="background-color: rgb(255, 255, 255); font-weight: 700;">Author notification:
</span><span style="background-color: rgb(255, 255, 255);">November 30th, 2021</span></p>
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<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="background-color: rgb(255, 255, 255); font-weight: 700;">Camera-ready:
</span><span style="background-color: rgb(255, 255, 255);">December 20th, 2021</span></p>
</li></ul>
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<span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-weight: 700; text-decoration: underline; text-decoration-skip-ink: none;">ORGANIZATION and CONTACT*</span></p>
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<span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-weight: 700;">Sergio Escalera*,
</span><span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-weight: 400;">Computer Vision Center (CVC) and University of Barcelona, Spain <</span><a href="mailto:sergio.escalera.guerrero@gmail.com"><span style="font-size: 10pt; font-family: Arial; color: rgb(17, 85, 204); background-color: rgb(255, 255, 255); font-weight: 400; text-decoration: underline; text-decoration-skip-ink: none;">sergio.escalera.guerrero@gmail.com</span></a><span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-weight: 400;">> </span></p>
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<span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-weight: 700;">Cristina Palmero*,
</span><span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-weight: 400;">Computer Vision Center (CVC) and University of Barcelona, Spain <</span><a href="mailto:c.palmero.cantarino@gmail.com"><span style="font-size: 10pt; font-family: Arial; color: rgb(17, 85, 204); background-color: rgb(255, 255, 255); font-weight: 400; text-decoration: underline; text-decoration-skip-ink: none;">c.palmero.cantarino@gmail.com</span></a><span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-weight: 400;">> </span></p>
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<span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-weight: 700;">Wei-Wei Tu,
</span><span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-weight: 400;">4Paradigm Inc., China</span></p>
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<span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-weight: 700;">Albert Clapés,
</span><span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-weight: 400;">Computer Vision Center (CVC), Spain</span></p>
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<span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-weight: 700;">Julio C. S. Jacques Junior</span><span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-weight: 400;">,
Computer Vision Center (CVC/UAB), Spain</span></p>
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<span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-weight: 700; text-decoration: underline; text-decoration-skip-ink: none;">Sponsors:</span><span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-weight: 700;"> </span><span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-weight: 400;">This
event is sponsored by ChaLearn, 4Paradigm Inc., and Facebook Reality Labs. University of Barcelona, Computer Vision Center at Autonomous University of Barcelona, and Human Pose Recovery and Behavior Analysis (HuPBA) group, are the co-sponsors of the Challenge.</span></p>
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<span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-weight: 700; text-decoration: underline; text-decoration-skip-ink: none;">Prizes:</span><span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-weight: 700;"> </span><span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-weight: 400;">Top
winning solutions will be invited to give a talk to present their work at the associated ICCV 2021 ChaLearn workshop, will receive a winning certificate and will have
</span><span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-weight: 400; text-decoration: underline; text-decoration-skip-ink: none;">free ICCV registration</span><span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-weight: 400;">.
Our sponsors are also offering the following prizes:</span></p>
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<span style="background-color: rgb(255, 255, 255);">Track 1: </span><span style="background-color: rgb(255, 255, 255); font-weight: 700;">Top-1 solution: 1000$</span><span style="background-color: rgb(255, 255, 255);"> /
</span><span style="background-color: rgb(255, 255, 255); font-weight: 700;">Top-2 solution: 500$</span><span style="background-color: rgb(255, 255, 255);"> /
</span><span style="background-color: rgb(255, 255, 255); font-weight: 700;">Top-3 solution: 300$</span></p>
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<span style="background-color: rgb(255, 255, 255);">Track 2: </span><span style="background-color: rgb(255, 255, 255); font-weight: 700;">Top-1 solution: 1000$</span><span style="background-color: rgb(255, 255, 255);"> /
</span><span style="background-color: rgb(255, 255, 255); font-weight: 700;">Top-2 solution: 500$</span><span style="background-color: rgb(255, 255, 255);"> /
</span><span style="background-color: rgb(255, 255, 255); font-weight: 700;">Top-3 solution: 300$</span></p>
</li></ul>
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<span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-weight: 400; text-decoration: underline; text-decoration-skip-ink: none;">Honorable mention:</span><span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-weight: 400;"> based
on the significance of the result in a particular trait/s (track 1) or body part (track 2) and the level of novelty/originality of the solution, in addition to top-3 solutions, we may announce additional
</span><span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-weight: 400; font-style: italic;">honorable mentions</span><span style="font-size: 10pt; font-family: Arial; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-weight: 400;">,
which will also receive a winning certificate and a free ICCV registration.</span></p>
</b><br>
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All the best,</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
<a href="http://chalearnlap.cvc.uab.es/workshop/44/people/2/#" title="http://chalearnlap.cvc.uab.es/workshop/44/people/2/#">the challenge organizers</a></div>
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