Provides an in-memory cache initializable from file #147
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The main motivation for now is to help speed up computing term weights for some of the corpora, in particular taxon_annotations, but it is designed not to be specific to that case in any way. Be default the cache will behave as an in-memory cache, i.e., starting as an empty cache when the R session is started. Optionally it can, however, be initialized with a precomputed cache, which would normally be obtained by serializing the cache after the calculations or queries meant to be cached have been run.
The annotations count function is currently only used for the "taxon_annotations" corpus. This cache uses a persistent file for initializing, the corpus size cache is only in memory.
This change should achieve compatibility with "Staged Installation", see https://developer.r-project.org/Blog/public/2019/02/14/staged-install/
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The main motivation for now is to help speed up computing term weights for some of the corpora, in particular taxon_annotations, but it is designed not to be specific to that case in any way.
Be default the cache will behave as an in-memory cache, i.e., starting as an empty cache when the R session is started. Optionally it can, however, be initialized with a precomputed cache, which would normally be obtained by serializing the cache after the calculations or queries meant
to be cached have been run.