fix ambiguity #748

matbesancon · 2019-05-23T09:22:59Z

There was a method ambiguity because of the non-sub-typing in the indicator bridge definition.

matbesancon · 2019-05-23T09:24:12Z

I caught this with SCIP:

 Resolving package versions...
Test Summary:        | Pass  Total
direct library calls |   19     19
Test Summary:  | Pass  Total
managed memory |   93     93
indicator3: Error During Test at /home/mbesancon/.julia/packages/MathOptInterface/XjmMj/src/Test/config.jl:45
  Got exception outside of a @test
  MethodError: MathOptInterface.Bridges.concrete_bridge_type(::Type{MathOptInterface.Bridges.IndicatorActiveOnFalseBridge{Float64,MathOptInterface.VectorAffineFunction{Float64},MathOptInterface.LessThan{Float64}}}, ::Type{MathOptInterface.VectorAffineFunction{Float64}}, ::Type{MathOptInterface.IndicatorSet{ACTIVATE_ON_ZERO::ActivationCondition = 0,MathOptInterface.LessThan{Float64}}}) is ambiguous. Candidates:
    concrete_bridge_type(::Type{#s640} where #s640<:(MathOptInterface.Bridges.IndicatorActiveOnFalseBridge{T,F,S} where S<:MathOptInterface.AbstractScalarSet where F<:MathOptInterface.AbstractVectorFunction), ::Type{F}, ::Type{MathOptInterface.IndicatorSet{ACTIVATE_ON_ZERO::ActivationCondition = 0,S}}) where {T, F, S} in MathOptInterface.Bridges at /home/mbesancon/.julia/packages/MathOptInterface/XjmMj/src/Bridges/indicatorbridge.jl:56
    concrete_bridge_type(bridge_type::DataType, ::Type{#s640} where #s640<:MathOptInterface.AbstractFunction, ::Type{#s639} where #s639<:MathOptInterface.AbstractSet) in MathOptInterface.Bridges at /home/mbesancon/.julia/packages/MathOptInterface/XjmMj/src/Bridges/bridge.jl:93
  Possible fix, define
    concrete_bridge_type(::Type{#s640} where #s640<:(MathOptInterface.Bridges.IndicatorActiveOnFalseBridge{T,F,S} where S<:MathOptInterface.AbstractScalarSet where F<:MathOptInterface.AbstractVectorFunction), ::Type{F<:MathOptInterface.AbstractFunction}, ::Type{MathOptInterface.IndicatorSet{ACTIVATE_ON_ZERO::ActivationCondition = 0,S}})
  Stacktrace:
   [1] concrete_bridge_type(::MathOptInterface.Bridges.LazyBridgeOptimizer{SCIP.Optimizer}, ::Type{MathOptInterface.VectorAffineFunction{Float64}}, ::Type{MathOptInterface.IndicatorSet{ACTIVATE_ON_ZERO::ActivationCondition = 0,MathOptInterface.LessThan{Float64}}}) at /home/mbesancon/.julia/packages/MathOptInterface/XjmMj/src/Bridges/bridgeoptimizer.jl:59
   [2] add_constraint(::MathOptInterface.Bridges.LazyBridgeOptimizer{SCIP.Optimizer}, ::MathOptInterface.VectorAffineFunction{Float64}, ::MathOptInterface.IndicatorSet{ACTIVATE_ON_ZERO::ActivationCondition = 0,MathOptInterface.LessThan{Float64}}) at /home/mbesancon/.julia/packages/MathOptInterface/XjmMj/src/Bridges/bridgeoptimizer.jl:447

matbesancon · 2019-05-23T09:39:54Z

For info, other ambiguities are present:

julia> Test.detect_ambiguities(MathOptInterface , imported=false)
4-element Array{Tuple{Method,Method},1}:
 (get(b::MathOptInterface.Bridges.VectorSlackBridge{T,F,S}, ::MathOptInterface.ListOfConstraintIndices{F,MathOptInterface.Zeros}) where {T, F, S} in MathOptInterface.Bridges at /home/mbesancon/.julia/dev/MathOptInterface/src/Bridges/slackbridge.jl:155, get(b::MathOptInterface.Bridges.VectorSlackBridge{T,F,S}, ::MathOptInterface.ListOfConstraintIndices{MathOptInterface.VectorOfVariables,S}) where {T, F, S} in MathOptInterface.Bridges at /home/mbesancon/.julia/dev/MathOptInterface/src/Bridges/slackbridge.jl:156)
 (get(b::MathOptInterface.Bridges.ScalarSlackBridge{T,F,S}, ::MathOptInterface.ListOfConstraintIndices{F,MathOptInterface.EqualTo{T}}) where {T, F, S} in MathOptInterface.Bridges at /home/mbesancon/.julia/dev/MathOptInterface/src/Bridges/slackbridge.jl:53, get(b::MathOptInterface.Bridges.ScalarSlackBridge{T,F,S}, ::MathOptInterface.ListOfConstraintIndices{MathOptInterface.SingleVariable,S}) where {T, F, S} in MathOptInterface.Bridges at /home/mbesancon/.julia/dev/MathOptInterface/src/Bridges/slackbridge.jl:54)
 (get(b::MathOptInterface.Bridges.VectorSlackBridge{T,F,S}, ::MathOptInterface.NumberOfConstraints{F,MathOptInterface.Zeros}) where {T, F, S} in MathOptInterface.Bridges at /home/mbesancon/.julia/dev/MathOptInterface/src/Bridges/slackbridge.jl:153, get(b::MathOptInterface.Bridges.VectorSlackBridge{T,F,S}, ::MathOptInterface.NumberOfConstraints{MathOptInterface.VectorOfVariables,S}) where {T, F, S} in MathOptInterface.Bridges at /home/mbesancon/.julia/dev/MathOptInterface/src/Bridges/slackbridge.jl:154)        
 (get(b::MathOptInterface.Bridges.ScalarSlackBridge{T,F,S}, ::MathOptInterface.NumberOfConstraints{F,MathOptInterface.EqualTo{T}}) where {T, F, S} in MathOptInterface.Bridges at /home/mbesancon/.julia/dev/MathOptInterface/src/Bridges/slackbridge.jl:51, get(b::MathOptInterface.Bridges.ScalarSlackBridge{T,F,S}, ::MathOptInterface.NumberOfConstraints{MathOptInterface.SingleVariable,S}) where {T, F, S} in MathOptInterface.Bridges at /home/mbesancon/.julia/dev/MathOptInterface/src/Bridges/slackbridge.jl:52)

codecov-io · 2019-05-23T09:45:14Z

Codecov Report

Merging #748 into master will increase coverage by 0.05%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #748      +/-   ##
==========================================
+ Coverage   94.26%   94.31%   +0.05%     
==========================================
  Files          56       56              
  Lines        6170     6211      +41     
==========================================
+ Hits         5816     5858      +42     
+ Misses        354      353       -1

Impacted Files	Coverage Δ
src/Bridges/indicatorbridge.jl	`100% <100%> (ø)`	⬆️
src/Bridges/rsocbridge.jl	`100% <0%> (ø)`	⬆️
src/Utilities/cachingoptimizer.jl	`92.48% <0%> (ø)`	⬆️
src/Test/UnitTests/basic_constraint_tests.jl	`97.61% <0%> (ø)`	⬆️
src/attributes.jl	`94.66% <0%> (ø)`	⬆️
src/Utilities/functions.jl	`95% <0%> (+0.07%)`	⬆️
src/Bridges/bridgeoptimizer.jl	`91.82% <0%> (+1.82%)`	⬆️

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blegat · 2019-05-23T19:37:38Z

For info, other ambiguities are present:

They should not happen, e.g. because slack bridges do not bridge SingleVariable-in-EqualTo constraints. Thanks for the info, I didn't know about this detect_ambiguities

blegat · 2019-05-23T19:43:20Z

We are missing a tests. I suggest to do these changes:

The bridge type should be concrete here:
https://github.com/JuliaOpt/MathOptInterface.jl/pull/748/files#diff-9b669e0d032ef727dedac270185d6451R18

And concrete_bridge_type should be called here:
https://github.com/JuliaOpt/MathOptInterface.jl/pull/748/files#diff-9b669e0d032ef727dedac270185d6451R18

matbesancon · 2019-05-24T09:41:36Z

The bridge type should be concrete here

Why? It is accepting a sub-type of IndicatorActiveOnFalseBridge so will remain valid

blegat · 2019-05-24T12:14:17Z

Why?

We always give a concrete type to this function:
https://github.com/JuliaOpt/MathOptInterface.jl/blob/06216dc6907b5ec76390c8380e4655065c83ea22/src/Bridges/bridgeoptimizer.jl#L455-L461
and the first argument is always a concrete type for other bridges. By consistency, it would be better if we do the same for the indicator bridge.

matbesancon · 2019-05-24T13:21:10Z

Fixed in last commit, it calls concrete_bridge_type

blegat · 2019-05-24T15:13:48Z

You didn't push the commit

matbesancon · 2019-05-24T15:22:54Z

Last commit from 6 hours ago, calls concrete_bridge_type

blegat · 2019-05-24T15:42:11Z

It should be called in the tests and the methods should only be defined when the first argument is concrete

matbesancon · 2019-05-24T22:01:38Z

I won't have time for this before at least sunday evening I think

…

On Fri, May 24, 2019 at 5:42 PM Benoît Legat ***@***.***> wrote: It should be called in the tests and the methods should only be defined when the first argument is concrete — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#748>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AB2FDMTJ3BJFH5X7ZYDCJNDPXAEFJANCNFSM4HO3V67Q> .

-- Mathieu Besançon

blegat · 2019-05-25T08:52:03Z

No rush, MOI v0.9 won't be tagged with only 2 solvers ready: #736

matbesancon · 2019-05-28T09:57:30Z

ok, tests pass, and SCIP tests also with this version

src/Bridges/indicatorbridge.jl

matbesancon · 2019-05-28T14:53:01Z

@blegat seems good here

src/Bridges/indicatorbridge.jl

fix ambiguity

8aacba9

use concrete bridge type

5720668

blegat added this to the v0.9 milestone May 25, 2019

matbesancon added 2 commits May 28, 2019 10:14

concrete bridge tests

1b55be7

fix subtyping

9c00b02

blegat reviewed May 28, 2019

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src/Bridges/indicatorbridge.jl Outdated Show resolved Hide resolved

matbesancon added 3 commits May 28, 2019 13:51

bridge constraint concrete type

a9853a4

fix test

c6eea12

remove BT

9c03f61

blegat reviewed May 28, 2019

View reviewed changes

src/Bridges/indicatorbridge.jl Outdated Show resolved Hide resolved

subtype directly in-place

1bf0674

blegat approved these changes May 28, 2019

View reviewed changes

blegat merged commit 52d166f into jump-dev:master May 28, 2019

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fix ambiguity #748

fix ambiguity #748

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fix ambiguity #748

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