[Scip] reduce cost in plugin INIT

[何河]

Dear all,

>From the documentation:
The NODESELINIT callback is executed after the problem was transformed. The
node selector may, e.g., use this call to initialize his node selector data.

If the INIT is costly, e.g. including file reading, is there a way to just
do it once at the beginning and simply copy the values read? In my case,
it's called many times after the plugin is copied to solve a sub-SCIP
process and the same file is read repeatedly. Any suggestion is
appreciated. Thanks!!

He
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