問題文
A foundry's defect model is trained on records of castings that were sent for rework. Castings that passed first time were never photographed. An auditor examines what this means for the model. Which characterization is correct?
選択肢
- The collected records are appropriate because they contain the cases the model needs to learn to recognize, and the castings that passed first time would add nothing to what the model has to distinguish.
- The training records over-represent defective castings because of how they were collected, so the model's behavior on the mix it meets in production cannot be inferred from its behavior on that set.
- The issue is that the foundry has not labeled the records consistently, since different inspectors will have described the same defect in different terms over the years, and an agreement measure between inspectors is what the auditor should be asking for at this point.
- The concern is that photographs are a poor input for this purpose and the foundry needs to record the measured dimensions of each casting instead, since numerical measurements are more reliable than images and remove the difficulty.