A Class Distance Penalty Deep Learning Method for Post-disaster Building Damage Assessment
Bibliographic record
Abstract
Automatic building damage assessment can significantly aid rescue operations, attributed to booming deep learning and remote sensing technologies. However, the class imbalance of the dataset often skews prediction models towards the majority class in the segmentation of damaged buildings. This issue is further exacerbated when damaged buildings are categorized into multiple scales, intensifying biases within the models. Hence, this research adopts an algorithm-level method to improve the reliability of post-disaster damage assessment. It proposes a novel loss function named Ordinal Class Distance Penalty Loss (OCDPL), considering the ordinal relationship between classes and penalizing the misclassifications according to the class error distance. Two hyperparameters are also introduced to enable the model to fine-tune the contribution of ordinal relationships on the loss function. The satellite images of hurricane disasters in the xBD dataset were adopted as the case study. The results show that the proposed approach can improve F1 scores and Mean Absolute Error of overall damage level classes. Notably, the findings underscore the value of leveraging information on ordinal classes to facilitate the learning of minority classes and diminish class error distances. This aspect holds particular significance for emergency responses to widespread and severe disasters.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.003 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".