stanford-oval / thingtalk / 690 / 2

82%

master: 78%

Pull #156

travis-ci

SchemaRetriever: add negative caching

Store the fact that a class does not exist in the local cache,
so we don't hit the Thingpedia database repeatedly when typechecking
datasets.
This is particularly a problem for the non-developer model in almond-cloud,
which typechecks a lot of sentences with invisible devices, and thus
hammers the database

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