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cern-hep-challenge-2025 / Multidimensional Regression on LHC collision jets

Posted last yr.

Score clarification

Hi,
Just making sure - is the score which shows up on the leaderboard better when lower? So a score of 0 would be the best possible score?

Apologies for asking such a trivial question but I couldn't attend the AMA sessions!

Thanks,
Marcin

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marcinj8

Posted last yr.

Score clarification

Hi,
Just making sure - is the score which shows up on the leaderboard better when lower? So a score of 0 would be the best possible score?

Apologies for asking such a trivial question but I couldn't attend the AMA sessions!

Thanks,
Marcin

Order by:

Posted by yhaddad • last yr.

Hi Marcin,

Yes, you’re absolutely right. Lower scores are better. The leaderboard score is based on the Kullback-Leibler (KL) divergence, which measures the difference between your predicted distributions (In our scase the Jet Multiplicity Distribution and Leading & Subleading Jet

p_T

) and the ground truth. A perfect score of 0 would mean your predictions exactly match the true distributions (i.e

P(i) = Q(i)

), though that is very hard to achieve in practice, so it's very unlikely.

No worries at all about the question, happy to clarify, and thanks for checking in.

Cheers, Yacine

Posted by stubbi • last yr.

Hi @marcinj8,

Thanks for bringing this up! I think the overview is wrong in this case. Higher score is better.

Best,
Jannes

Posted by stubbi • last yr.

@marcinj8 actually my statement might be wrong. Waiting for official statement by @cern

Posted by jag • last yr.

I'm interested to know too. :)

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Posted by yhaddad • last yr.

Hi Marcin,

p_T

) and the ground truth. A perfect score of 0 would mean your predictions exactly match the true distributions (i.e

P(i) = Q(i)

), though that is very hard to achieve in practice, so it's very unlikely.

No worries at all about the question, happy to clarify, and thanks for checking in.

Cheers, Yacine

Posted by stubbi • last yr.

Hi @marcinj8,

Thanks for bringing this up! I think the overview is wrong in this case. Higher score is better.

Best,
Jannes

Posted by stubbi • last yr.

@marcinj8 actually my statement might be wrong. Waiting for official statement by @cern

Posted by jag • last yr.

I'm interested to know too. :)