#20414: Add copy/__copy__ methods to CVXOPT, PPL, InteractiveLP backends, and
__deepcopy__ to MixedIntegerLinearProgram and backends
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Reporter: mkoeppe | Owner:
Type: defect | Status: needs_review
Priority: major | Milestone: sage-7.2
Component: numerical | Resolution:
Keywords: lp | Merged in:
Authors: Matthias Koeppe | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/mkoeppe/add_copy___copy___methods_to_cvxopt__ppl__interactivelp_backends|
3117b01e595febc8fc6de90eeb3cf19a7e97c7bd
Dependencies: | Stopgaps:
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Comment (by mkoeppe):
Replying to [comment:13 dimpase]:
> was there something about variables that are (not) copied?
Before this patch, deepcopy didn't even copy the backend of a MIP.
Now it does, simply by doing the same as copy.
Both copy and deepcopy have weird semantics in relation to the
MIPVariables in a problems -- because a MIP does not have an API to gain
access to its variables; and trying to use the old MIPVariables with the
copy is questionable and definitely broken if one creates new components
of this variable, see #15159, #19523. Fixing this would require a
redesign; a possible stopgap would be to stop all MIPVariables from
creating new components when they have been subjected to copy().
--
Ticket URL: <http://trac.sagemath.org/ticket/20414#comment:14>
Sage <http://www.sagemath.org>
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