Unbalanced train segments for Knock

A sharp noise of a rigid surface being struck, usually without damage and deliberately, most often with the knuckles of the hand. WordNet

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We estimate this class has medium quality

In a random sample of videos for this class, we found 6 / 9 (67%) were accurate. Note that quality in the unbalanced training set may be significantly lower. Learn more.
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Unbalanced train videos for Knock (202)