Scalability in recommender systems includes both very large problem sizes and real-time latency requirements. For instance, a
recommender system connected to a large Web site must produce each recommendation within a few tens of milliseconds while
serving hundreds or thousands of consumers simultaneously. The key performance measures are the maximum accepted latency for a
recommendation (tens to hundreds of milliseconds), the number of simultaneous recommendation requests (tens to thousands), the
number of consumers (hundreds of thousands to millions), the number of products (tens to millions), and the number of ratings per
consumer (tens to thousands). Many techniques from data mining can be adapted to the scalability problem for recommender
systems, including dimensionality reduction and parallelism, but must be modified to meet the simultaneous throughput and latency
requirements.
Scalability in recommender systems includes both very large problem sizes and real-time latency requirements. For instance, a
recommender system connected to a large Web site must produce each recommendation within a few tens of milliseconds while
serving hundreds or thousands of consumers simultaneously. The key performance measures are the maximum accepted latency for a
recommendation (tens to hundreds of milliseconds), the number of simultaneous recommendation requests (tens to thousands), the
number of consumers (hundreds of thousands to millions), the number of products (tens to millions), and the number of ratings per
consumer (tens to thousands). Many techniques from data mining can be adapted to the scalability problem for recommender
systems, including dimensionality reduction and parallelism, but must be modified to meet the simultaneous throughput and latency
requirements.
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