DS-200Data Science Essentials
60 Questions and Answers Experienced specialists selected 60 questions for this exam. All answers are verified to ensure correctness.
Last Updated Apr 27, 2024 Ace your exams with our consistently updated DS-200 exam dumps.
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DS-200 Online Practice Questions and Answers
You have a large m x n data matrix M. You decide you want to perform dimension reduction/clustering on your data and have decide to use the singular value decomposition (SVD; also called principal components analysis PCA)
Refer to the passage above.
What represents the SVD of the Matrix standard M given the following information:
U is m x m unitary V is n x n unitary S is m x n diagonal Q is n x n invertible D is n x n diagonal L is m x m lower triangular U is m x m upper triangular
A. M = U S V
B. M = U P
C. M = Q D Q-1
D. M = L U
What is one limitation encountered by all systems that employ collaborative filtering and use preferences as input. In order to output product recommendations to consumers?
A. Consumers do not have stable ratings for the same product over time
B. There are too many consumers and too few products
C. Not every product has been rated by every consumer
D. There are too few consumers and too many products
Which three metrics are useful in measuring the accuracy and quality of a recommender system?
A. Mutual Information
B. RMSF
C. Tanimoto coefficient
D. Pearson correlation
E. Precision
F. Recall
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