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From Sean Owen <>
Subject Re: Save a UserSimilarity in a File
Date Thu, 17 May 2012 11:06:18 GMT
I think it will be way too slow to update a file like this, as you must
seek and rewrite the whole thing. Files aren't for this sort of update. A
DB might be.

Even if it were it is probably too slow to read the similarity from backing
store each time. It needs to be mostly in memory. That's why the caching
wrapper is probably what you want.

On May 17, 2012 11:25 AM, "Nikolaos Romanos Katsipoulakis" <> wrote:

> Hey guys,
> In my recommender i need to save my UserSimilarity (CachingUserSimilarity
> to be exact) in a file, and whenever I get a request for a recommendation,
> i need to load it from a file, retrieve the recommendation, and then store
> it back in a file. Can this be done? I have seen in the mahout
> documentation a class FileItemSimilarity, which has a constructor that
> parses the FileItemSimilarity from a file. Is there a similar
> FileUserSimilarity? How is the FileItemSimilarity represented in the file?
> Thank you

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