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Re: SPARQL 1.2 Extended Aggregate Functions

From: Alfredo Serafini <seralf@gmail.com>
Date: Wed, 3 Apr 2019 10:54:27 +0200
Message-ID: <CADawF4MnpY4++cuazoW+H+ywT3z+Ydk0vfXtnR5d3rUC_3usXw@mail.gmail.com>
To: Marco Neumann <marco.neumann@gmail.com>
Cc: public-sparql-12@w3.org
+1 for median, mean and so on. More generally it would be great to be able
to define and register UDF!
this would include also probably the need for a standard way/syntax to
provide parameter values (thus in a way the chance to use some SPARQL query
as a sort of template, for example in order to produce CSV by request)

IMHO cluster analysis is something on top on that level, and once we had a
standard way to register user-defined-functions, we could define specific
functions to act as a facade over naive or complex ML process.
And we could also move complex logic to a SERVICE counterpart maybe?

Il giorno mer 3 apr 2019 alle ore 00:45 Marco Neumann <
marco.neumann@gmail.com> ha scritto:

> I'd like to see a few more aggregate functions in the spec. In
> particular for statistical evaluation .
> For example I have noticed that simple functions like median are
> missing from SPARQL 1.1
> In extension it might be attractive to add basic cluster analysis
> features here as well.
> It might be a good idea to take a look at current implementations and
> compare features for complexity and performance for inclusion.
> Best,
> Marco
> --
> ---
> Marco Neumann
Received on Wednesday, 3 April 2019 08:55:28 UTC

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