Checklist ROAI 2026 Selection Camp – GPU Practical Round · Task 2
Corrupt Decoder
Re-pair noisy latent features with shuffled images using a corrupted autoencoder decoder, and fine-tune the decoder to repair its outputs.
The task
A trained image autoencoder (160×160 RGB images, 128-dimensional features) has been corrupted: decoder weights were truncated to one decimal place, stored features carry Gaussian noise, images were lightly jittered and the image folder was shuffled. Comparisons are to be made in InceptionV3 feature space, with bipartite matching via the Hungarian algorithm.
Subtask 1 asks for the image index of each of 1,500 unordered features (a 500-pair ordered pool is given for validation). Subtask 2 provides 4,000 feature–clean image pairs for fine-tuning the decoder; the contestant decodes 500 test features and submits pooled InceptionV3 features of the decoded images.
Abridged by SOTA from the official materials. The official statement has the exact rules, and it wins wherever this summary differs.
At a glance
- You get
- task1/unordered (1,500 noisy features and 1,500 augmented images), task1/ordered (500 index-aligned pairs), task2/train (4,000 feature–image pairs), task2/test (500 features); starter kit with
model.py,submission.py,data_loader.py,decoder.pt(fp16, truncated weights),load_utility.pyandinception_v3.pth. - You submit
submission.csvbuilt withsubmit_task1(matched image index per feature) andsubmit_task2(base64-encoded float32 feature vector per decoded test image).- Scoring
- Subtask 1 (50 points): exact-match accuracy of the permutation, piecewise (below 0.30: 5 points; 0.30–0.90: 5→15; 0.90–0.93: 15→30; above 0.93 to 0.97/0.98: 30→40/45 as printed; above 0.98: 50). Subtask 2 (50 points): mean cosine similarity to hidden reference features from the original decoder (below 0.80: 0; 0.80–0.94: 0→45; above 0.94: 50). A format-valid submission earns at least 5 points per subtask.
- Rules
- GPU round
- Perceptual comparison with the supplied offline InceptionV3 weights
- On-site at the National College of Informatics "Tudor Vianu", Bucharest
- Internet access and packages restricted to the allowed list in the round rules
- Final score computed on hidden test data; only selected submissions count
- Format
- ROAI 2026 selection camp, GPU practical round, 27 May 2026.