CS 156b Spring 2025-2026

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Welcome to the 2025-2026 spring term iteration of CS156b! As with last year, we'll be working with a dataset of radiograph images. Radiography is the most commonly used method of chest imaging, and has been a staple tool for diagnosis and screening of diseases. Automated anomaly detection in radiograph images would greatly assist medical professionals with correctly diagnosing these anomalies.

Public phase: Submit to receive scores on the public test set. Your score is visible on the leaderboard and you can compare with other participants.

Private phase: Submit to be evaluated on the private (holdout) test set. Your private score is not shown to you or other participants until the challenge ends. The admin can see the private leaderboard.

File format: Submit a .csv file.

Required columns (in any order): Id, No Finding, Enlarged Cardiomediastinum, Cardiomegaly, Lung Opacity, Pneumonia, Pleural Effusion, Pleural Other, Fracture, Support Devices.

Scoring: For each category, the Mean Squared Error (MSE) is computed and scaled by the variance to produce a normalized score. Blank labels in the ground truth are excluded from scoring. Lower scores are better.

Honor Code: No member of the community shall take unfair advantage of any other member of the community.

Resources: You may use online resources (papers, articles, code) as long as they do not directly pertain to this specific challenge.

Public Leaderboard

No username Average Cardiomegaly Enlarged Cardiomediastinum Fracture Lung Opacity No Finding Pleural Effusion Pleural Other Pneumonia Support Devices total_submission last_sub
1 scalm 0.645 0.38 0.642 0.664 0.733 0.616 0.29 0.912 0.813 0.749 360 2026-06-05 21:26:49.835774
2 kberkson 0.645 0.38 0.642 0.667 0.737 0.61 0.286 0.923 0.826 0.738 95 2026-06-05 13:30:53.617062
3 Yubo_Baaqer_Hudson 0.658 0.393 0.649 0.689 0.747 0.622 0.291 0.909 0.839 0.78 280 2026-05-26 12:17:26.407728
4 AMA 0.66 0.397 0.647 0.683 0.744 0.622 0.293 0.931 0.834 0.793 88 2026-05-22 19:33:19.662475
5 haa 0.673 0.397 0.656 0.68 0.747 0.633 0.305 0.966 0.88 0.797 65 2026-05-27 19:54:40.856782
6 JSC 0.688 0.417 0.662 0.698 0.771 0.642 0.31 0.963 0.866 0.863 17 2026-05-27 02:03:45.741762
7 ellieelizabethsiki 0.7 0.412 0.686 0.722 0.771 0.649 0.327 0.966 0.85 0.915 50 2026-05-26 16:55:31.570559
8 imss 0.701 0.423 0.666 0.73 0.797 0.66 0.321 0.956 0.879 0.877 37 2026-05-26 09:28:05.451855
9 peakyblinders2 0.704 0.431 0.684 0.729 0.793 0.661 0.323 0.968 0.898 0.849 36 2026-05-01 10:54:37.316714
10 Muren_Lin_Steven 0.704 0.423 0.669 0.716 0.785 0.659 0.33 0.967 0.902 0.883 26 2026-05-28 00:54:04.616922
11 ERE 0.706 0.433 0.682 0.742 0.803 0.67 0.331 0.982 0.878 0.836 15 2026-05-05 23:30:39.235444
12 h3 0.709 0.42 0.676 0.714 0.8 0.658 0.323 0.971 0.885 0.935 29 2026-05-25 11:36:46.356813
13 njack 0.709 0.448 0.731 0.73 0.783 0.656 0.322 0.968 0.878 0.862 45 2026-05-29 12:41:06.315198
14 SSSClassCSNerds 0.71 0.424 0.676 0.706 0.795 0.664 0.364 0.945 0.881 0.936 55 2026-05-29 12:49:50.257180
15 ALA 0.711 0.442 0.688 0.702 0.796 0.679 0.35 0.963 0.902 0.872 47 2026-05-28 11:08:13.860236
16 JDP 0.727 0.468 0.704 0.75 0.815 0.668 0.338 0.995 0.953 0.853 31 2026-05-28 00:57:59.186147
17 Association_for_Confused_Majors 0.734 0.478 0.734 0.757 0.807 0.673 0.335 0.999 0.918 0.904 54 2026-06-04 17:12:37.119468
18 wuxuwu 0.743 0.483 0.795 0.766 0.809 0.715 0.412 0.957 0.895 0.857 87 2026-05-24 16:05:29.531986
19 Yubo_Jafar_Hudson 1.333 0.851 1.211 1.16 1.261 2.542 0.75 1.756 0.997 1.467 13 2026-04-08 10:40:20.498452

Private Leaderboard

No username Average Cardiomegaly Enlarged Cardiomediastinum Fracture Lung Opacity No Finding Pleural Effusion Pleural Other Pneumonia Support Devices total_submission last_sub
1 kberkson 0.653 0.387 0.652 0.717 0.731 0.633 0.311 0.915 0.827 0.706 16 2026-06-05 13:32:20.849673
2 scalm 0.653 0.389 0.65 0.707 0.73 0.631 0.313 0.918 0.813 0.723 106 2026-06-05 20:49:28.052112
3 AMA 0.67 0.403 0.66 0.743 0.747 0.645 0.32 0.901 0.835 0.773 3 2026-05-27 19:16:14.125402
4 Yubo_Baaqer_Hudson 0.678 0.418 0.671 0.748 0.753 0.653 0.328 0.935 0.838 0.754 1 2026-05-28 12:54:07.989964
5 haa 0.68 0.406 0.671 0.734 0.752 0.652 0.328 0.93 0.866 0.783 6 2026-05-28 00:44:49.571704
6 peakyblinders2 0.702 0.438 0.687 0.78 0.777 0.671 0.348 0.921 0.885 0.81 14 2026-06-01 10:15:34.249463
7 SSSClassCSNerds 0.704 0.423 0.676 0.751 0.773 0.663 0.348 0.931 0.861 0.907 15 2026-05-29 15:09:08.196563
8 JSC 0.704 0.429 0.679 0.764 0.77 0.665 0.341 0.941 0.874 0.87 1 2026-05-27 02:01:49.693453
9 imss 0.714 0.437 0.682 0.801 0.783 0.674 0.353 0.934 0.885 0.879 5 2026-05-28 13:54:33.632185
10 Muren_Lin_Steven 0.717 0.444 0.691 0.773 0.787 0.677 0.351 0.945 0.897 0.891 10 2026-05-29 13:46:42.820193
11 ellieelizabethsiki 0.718 0.427 0.692 0.783 0.781 0.672 0.357 0.963 0.875 0.908 1 2026-05-27 19:38:43.409094
12 ERE 0.718 0.451 0.718 0.8 0.767 0.686 0.353 0.961 0.904 0.823 1 2026-05-27 16:38:06.511315
13 h3 0.718 0.433 0.687 0.784 0.784 0.675 0.352 0.942 0.872 0.935 1 2026-05-28 12:57:38.490071
14 ALA 0.719 0.447 0.697 0.765 0.789 0.687 0.372 0.955 0.887 0.871 3 2026-05-28 13:35:05.621834
15 JDP 0.742 0.474 0.725 0.812 0.805 0.688 0.361 1.02 0.943 0.853 2 2026-05-28 20:31:04.544137
16 Association_for_Confused_Majors 0.75 0.505 0.717 0.812 0.808 0.726 0.363 0.999 0.912 0.904 18 2026-06-04 17:34:35.017292
17 wuxuwu 0.753 0.498 0.773 0.806 0.801 0.724 0.444 0.949 0.917 0.866 9 2026-05-26 15:56:06.908813
18 njack 0.766 0.579 0.736 0.829 0.807 0.699 0.41 0.97 0.929 0.936 1 2026-05-29 00:24:11.355933