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Recomender System Interview questions and Answers

  • October 29, 2022
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  • In the context of Recommender systems. When customer data is about the Rating matrix for the various products, for similarity measure between the customers, it is required to ignore products where one of the pair of the customers has not rated the product. What aspect of Data preprocessing is being addressed by this?

    • a) Pair wise deletion
    • b) Mode imputation
    • c) Hot deck Imputation
    • d) Case wise deletion

    Answer - a) Pair wise deletion

    Pairwise deletion or Avalablbe case analysis is a method of keeping the missingness as is, till the point where the computation/comparison is not possible and only for those cases the missingness is deleted along with the complementing record(the other record with which the record with missingness is being compared/studied/distance computed) In a database with user ratings of products/services there bound to be a large number of missing values and absence of rating does not imply a '0' rating. therefore the pair-wise deletion is used wherein when a pair is being considered for distance/similarity measure only those products (columns) that have non-nan values for both the pairs are included in the measure and the rest are excluded.

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