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https://issues.apache.org/jira/browse/SYSTEMML-2077?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias Boehm updated SYSTEMML-2077:
-------------------------------------
Description:
This new eval builtin function aims to provide a concise language construct to
evaluate dynamic expressions and functions.
Similar to R's eval function
(https://stat.ethz.ch/R-manual/R-devel/library/base/html/eval.html), this would
allow us to evaluate dynamically constructed expressions. There are two major
sub tasks here: the invocation of given function pointers and the evaluation of
dynamic expressions given as strings. Initially, we would focus on the former
by allowing call such as {{R = eval(fname, A, B, C)}}. So far SystemML does not
provide second-order functions which requires explicit {{if-else}} conditions
for ensemble learning workloads. With this new {{eval}} function we could store
a list of function names in a frame {{F}} and dynamically call them via {{R[i,
] = eval(F[i,1], A, B, C)}}.
was:This new eval builtin function aims to provide a concise language
construct to evaluate dynamic expressions and functions.
> New eval builtin function
> -------------------------
>
> Key: SYSTEMML-2077
> URL: https://issues.apache.org/jira/browse/SYSTEMML-2077
> Project: SystemML
> Issue Type: Sub-task
> Reporter: Matthias Boehm
> Priority: Major
>
> This new eval builtin function aims to provide a concise language construct
> to evaluate dynamic expressions and functions.
> Similar to R's eval function
> (https://stat.ethz.ch/R-manual/R-devel/library/base/html/eval.html), this
> would allow us to evaluate dynamically constructed expressions. There are two
> major sub tasks here: the invocation of given function pointers and the
> evaluation of dynamic expressions given as strings. Initially, we would focus
> on the former by allowing call such as {{R = eval(fname, A, B, C)}}. So far
> SystemML does not provide second-order functions which requires explicit
> {{if-else}} conditions for ensemble learning workloads. With this new
> {{eval}} function we could store a list of function names in a frame {{F}}
> and dynamically call them via {{R[i, ] = eval(F[i,1], A, B, C)}}.
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