[Bioc-devel] loading database package changes random number
mtmorg@n@b|oc @end|ng |rom gm@||@com
Fri Apr 12 00:25:03 CEST 2019
This is actually from a dependency DelayedArray which, on load, calls DelayedArray::setAutoBPPARAM, which calls BiocParallel::MulticoreParam(), which uses the random number generator to select a random port for connection.
A different approach would be for DelayedArray to respect the user's configuration and use bpparam(), or perhaps look at the class of bpparam() and tell the user they should, e.g., BiocParallel::register(SerialParam()) if that's appropriate, or use registered("MulticoreParam") or registered("SerialParam") if available (they are by default) rather than creating an ad-hoc instance.
On 4/11/19, 10:17 AM, "Bioc-devel on behalf of Steffi Grote" <bioc-devel-bounces using r-project.org on behalf of steffi_grote using eva.mpg.de> wrote:
I found out that example code for my package GOfuncR yields a different result the first time it's executed, despite setting a seed. All the following executions are identical.
It turned out that loading the database package 'Homo.sapiens' changed the random numbers:
#  0.2875775
#  0.7883051
#  0.2875775
Is that known or expected behaviour?
Should I not load a package inside a function that later uses random numbers?
Thanks in advance,
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