A needle-works row is planned as still + note + tap sound, but the microphone failed and no audio was captured. How should that row be treated in the multimodal corpus?
Select an answer to reveal the explanation.
Short Explanation
The plan called for three arms; the mic never delivered the third. Call it missing-modality data and choose a policy—drop, keep two arms, or placeholder—not a magic fusion invent.
Full Explanation
When a planned modality was never collected, the row is a missing-modality construction problem. The data decision is whether to drop the example, retain the available arms, or insert an explicit placeholder. Fusion definitions and ASR service status do not create the uncollected audio.