java - Two dimensional array with million rows and columns -

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I have user-event data that participates in user ratings for user ratings. I have the equality matrix for which two-dimensional array is needed as input (User-Event Matrix with Event Ratings)

I have three columns of data: User ID, EventID, Rating

But the number of users is approximately two million and events count approximately 1 million, then what would be the efficient method to use the Java Library for computing similarity matrix? Be it As the numbers are large and not fit in memory in my system. I am using Java for the problem.

Thanks Aman


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