Re: Does the "mlr" plugin work on Linux with Weka?

I have investigated this a bit more. It's not just the mlr package that is
causing problems. Loading the ggplot2 package for R from the R console of
the WEKA Explorer using

library(ggplot2)

also triggers a core dump. The ggplot2 library appears to be implemented in
pure R (i.e., does not use native code) and does not have any dependencies
on other R packages (in contrast to mlr) so it should be a simpler test
case.

It turns out that the R binary for R 4.2.0 differs in size between Ubuntu
20.04 and 22.04, by quite a bit. Copying the library file libR.so from
20.04 to 22.04 and using that from WEKA (with necessary adjustments)
prevents the core dump from happening!

It now looks like something in the way R is compiled for recent versions of
Debian-based systems causes problems.

I have tried compiling R from source on 22.04, which does not fix the
issue, even when using clang instead of gcc (but I have not tried fiddling
with the optimization settings for the compiler, etc.).

I have also tried installing rJava 1.0-8 (see
https://www.rforge.net/rJava/news.html) in R instead of the 1.0-6 version
that is the newest version distributed via CRAN (and installed in R by
WEKA). That did not help either.

I'd love to know if other Java programs that use rJava to enable R commands
to be issued from a Java application exhibit the same issue on recent
versions of Debian(?)-based Linux systems. Everything works fine on macOS
(at least on my Mac Mini with an ARM chip), and there does not appear to be
an issue on Windows either (in both cases, I used the most recent stable
version of the operating system).

Cheers,
Eibe

On Mon, 26 Jun 2023 at 15:09, Eibe Frank <[email protected]> wrote:

> There is hope. I have just tried a system that runs Ubuntu 20.04 rather
> than 22.04, with the same version of R, Java, and WEKA, and MLRClassifier
> works fine on that system. The only issue was that I had to install a
> system library to get the xml package for R to install (and mlr to work):
>
> $ sudo apt-get install libxml2-dev
>
> I haven't tried this on 22.04 yet, but I suspect the issue is somewhere
> else in that case (perhaps the newer version of gcc that comes with Ubuntu
> 22.04 causes issues when compiling the R-related code from source). Here is
> the gcc version of the 20.04 system:
>
> $ gcc --version
> gcc (Ubuntu 9.4.0-1ubuntu1~20.04.1) 9.4.0
>
> Cheers,
> Eibe
>
> On Sun, 25 Jun 2023 at 23:15, Erkan Ozhan <[email protected]> wrote:
>
>> Hi Eibe, thank you very much for your feedback. Is there any hope for the
>> future?
>>
>> Best wishes.
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