Yoel Zeldes • 12/16/2018

The Story of a Bad Train-Test Split

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The article recounts a technical case study where adding thumbnail image features to a content recommendation model led to a biased train-test split. The author explains the need to prevent data leakage by ensuring unique thumbnails and titles are isolated to train or test sets, describes a naive implementation, and analyzes the unexpected performance degradation it caused, highlighting a crucial machine learning pitfall.

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#Machine Learning #Bia #Feature Engineering
The Story of a Bad Train-Test Split

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