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Provides an in-memory cache initializable from file #147

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Provides an in-memory cache initializable from file #147

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Commits on Feb 2, 2021

  1. Provides an in-memory cache initializable from file 

    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.
    @hlapp
    hlapp committed Feb 2, 2021
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  2. Memoises corpus size and annotations count functions 

    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.
    @hlapp
    hlapp committed Feb 2, 2021
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  3. Allows package path to be evaluated dynamically 

    This change should achieve compatibility with "Staged Installation", see
https://developer.r-project.org/Blog/public/2019/02/14/staged-install/
    @hlapp
    hlapp committed Feb 2, 2021
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