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TODOs for validation service
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author: Martin Guetlein, date: 2014-03-18
Refactoring
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* remove redis, replace with 4store
* remove gnuplot, replace with R
* to_json support
* change object ids to uuids (?)
Pitfalls
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* for better performance datasets are cached in memory (see lib/dataset_cache.rb), this might cause memmory issues when working with large datasets
* validation objects does store predictions in dataset (for better performance, to not read all datasets and models again), this can cause redis to get pretty large
* redis does load everything into main memmory, can cause memmory problems on the long run
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