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Simple example of structural_simplify giving ExtraVariablesSystemException #3021

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jaakkor2 opened this issue Sep 5, 2024 · 2 comments
Closed

Simple example of structural_simplify giving ExtraVariablesSystemException #3021

jaakkor2 opened this issue Sep 5, 2024 · 2 comments
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bug Something isn't working

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@jaakkor2
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jaakkor2 commented Sep 5, 2024

Attached example shows structural_simplify giving ExtraVariablesSystemException.

Describe the bug 🐞

The system has a @mtkmodel Passthrough that simply connects input to output. If this block is removed, the structural_simplify works ok. See the conditional in the connections-definition.

MWE

using ModelingToolkit
using ModelingToolkit: t_nounits as t, D_nounits as D
using ModelingToolkitStandardLibrary.Blocks: RealInput, RealOutput

@mtkmodel Dec begin
    @variables begin
        q(t)
    end
    @components begin
        input = RealInput()
        output = RealOutput()
    end
    @equations begin
        D(q) ~ -q + 0.1*input.u
        output.u ~ q
    end
end

@mtkmodel Passthrough begin
    @components begin
        input = RealInput()
        output = RealOutput()
    end
    @equations begin
        output.u ~ input.u
    end
end

systems = @named begin
    dec = Dec()
    pt = Passthrough()
end

connections = [
    if true # fail
        connect(dec.output, pt.input)
        connect(pt.output, dec.input)
    else # ok
        connect(dec.output, dec.input)
    end
    ]

@named sys_full = ODESystem(connections, t; systems)
sys = structural_simplify(sys_full, check_consistency = true)

Error & Stacktrace ⚠️

ERROR: ExtraVariablesSystemException: The system is unbalanced. There are 5 highest order derivative variables and 4 equations.
More variables than equations, here are the potential extra variable(s):
 dec₊q(t)
 pt₊input₊u(t)
Note that the process of determining extra variables is a best-effort heuristic. The true extra variables are dependent on the model and may not be in this list.
Stacktrace:
  [1] error_reporting(state::TearingState{…}, bad_idxs::Vector{…}, n_highest_vars::Int64, iseqs::Bool, orig_inputs::Set{…})
    @ ModelingToolkit.StructuralTransformations C:\Users\jaakkor2\MyTemp\mtkdebug\packages\ModelingToolkit\yfT8s\src\structural_transformation\utils.jl:50
  [2] check_consistency(state::TearingState{ODESystem}, orig_inputs::Set{Any})
    @ ModelingToolkit.StructuralTransformations C:\Users\jaakkor2\MyTemp\mtkdebug\packages\ModelingToolkit\yfT8s\src\structural_transformation\utils.jl:85
  [3] _structural_simplify!(state::TearingState{…}, io::Nothing; simplify::Bool, check_consistency::Bool, fully_determined::Bool, warn_initialize_determined::Bool, dummy_derivative::Bool, kwargs::@Kwargs{…})
    @ ModelingToolkit C:\Users\jaakkor2\MyTemp\mtkdebug\packages\ModelingToolkit\yfT8s\src\systems\systemstructure.jl:692
  [4] _structural_simplify!
    @ C:\Users\jaakkor2\MyTemp\mtkdebug\packages\ModelingToolkit\yfT8s\src\systems\systemstructure.jl:675 [inlined]
  [5] structural_simplify!(state::TearingState{…}, io::Nothing; simplify::Bool, check_consistency::Bool, fully_determined::Bool, warn_initialize_determined::Bool, kwargs::@Kwargs{…})
    @ ModelingToolkit C:\Users\jaakkor2\MyTemp\mtkdebug\packages\ModelingToolkit\yfT8s\src\systems\systemstructure.jl:635
  [6] __structural_simplify(sys::ODESystem, io::Nothing; simplify::Bool, kwargs::@Kwargs{…})
    @ ModelingToolkit C:\Users\jaakkor2\MyTemp\mtkdebug\packages\ModelingToolkit\yfT8s\src\systems\systems.jl:85
  [7] __structural_simplify
    @ C:\Users\jaakkor2\MyTemp\mtkdebug\packages\ModelingToolkit\yfT8s\src\systems\systems.jl:66 [inlined]
  [8] structural_simplify(sys::ODESystem, io::Nothing; simplify::Bool, split::Bool, allow_symbolic::Bool, allow_parameter::Bool, conservative::Bool, fully_determined::Bool, kwargs::@Kwargs{…})
    @ ModelingToolkit C:\Users\jaakkor2\MyTemp\mtkdebug\packages\ModelingToolkit\yfT8s\src\systems\systems.jl:24
  [9] structural_simplify
    @ C:\Users\jaakkor2\MyTemp\mtkdebug\packages\ModelingToolkit\yfT8s\src\systems\systems.jl:20 [inlined]
 [10] top-level scope
    @ REPL[11]:1
Some type information was truncated. Use `show(err)` to see complete types.

but dec₊q(t) and pt₊input₊u(t) should be the same since in Dec output.u ~ q and connect(dec.output, pt.input).

Environment (please complete the following information):

Latest ModelingToolkit and ModelingToolkitStandardLibrary

  • Output of using Pkg; Pkg.status()
Status `C:\Users\jaakkor2\MyTemp\mtkdebug\environments\v1.10\Project.toml`
  [961ee093] ModelingToolkit v9.36.0
  [16a59e39] ModelingToolkitStandardLibrary v2.11.0
  • Output of using Pkg; Pkg.status(; mode = PKGMODE_MANIFEST)
Status `C:\Users\jaakkor2\MyTemp\mtkdebug\environments\v1.10\Manifest.toml`
  [47edcb42] ADTypes v1.7.1
  [1520ce14] AbstractTrees v0.4.5
  [7d9f7c33] Accessors v0.1.37
  [79e6a3ab] Adapt v4.0.4
  [66dad0bd] AliasTables v1.1.3
  [ec485272] ArnoldiMethod v0.4.0
  [4fba245c] ArrayInterface v7.16.0
  [4c555306] ArrayLayouts v1.10.3
  [e2ed5e7c] Bijections v0.1.9
  [62783981] BitTwiddlingConvenienceFunctions v0.1.6
  [8e7c35d0] BlockArrays v1.1.0
  [2a0fbf3d] CPUSummary v0.2.6
  [00ebfdb7] CSTParser v3.4.3
  [d360d2e6] ChainRulesCore v1.24.0
  [fb6a15b2] CloseOpenIntervals v0.1.13
  [861a8166] Combinatorics v1.0.2
  [a80b9123] CommonMark v0.8.12
  [38540f10] CommonSolve v0.2.4
  [bbf7d656] CommonSubexpressions v0.3.1
  [f70d9fcc] CommonWorldInvalidations v1.0.0
  [34da2185] Compat v4.16.0
  [b152e2b5] CompositeTypes v0.1.4
  [a33af91c] CompositionsBase v0.1.2
  [2569d6c7] ConcreteStructs v0.2.3
  [187b0558] ConstructionBase v1.5.8
  [adafc99b] CpuId v0.3.1
  [a8cc5b0e] Crayons v4.1.1
  [9a962f9c] DataAPI v1.16.0
  [864edb3b] DataStructures v0.18.20
  [e2d170a0] DataValueInterfaces v1.0.0
  [2b5f629d] DiffEqBase v6.155.0
  [459566f4] DiffEqCallbacks v3.9.1
  [77a26b50] DiffEqNoiseProcess v5.23.0
  [163ba53b] DiffResults v1.1.0
  [b552c78f] DiffRules v1.15.1
  [a0c0ee7d] DifferentiationInterface v0.5.17
  [8d63f2c5] DispatchDoctor v0.4.14
  [31c24e10] Distributions v0.25.111
  [ffbed154] DocStringExtensions v0.9.3
  [5b8099bc] DomainSets v0.7.14
  [7c1d4256] DynamicPolynomials v0.6.0
  [06fc5a27] DynamicQuantities v1.0.0
  [4e289a0a] EnumX v1.0.4
  [f151be2c] EnzymeCore v0.7.8
  [e2ba6199] ExprTools v0.1.10
⌅ [6b7a57c9] Expronicon v0.8.5
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  [1a297f60] FillArrays v1.13.0
  [64ca27bc] FindFirstFunctions v1.4.1
  [6a86dc24] FiniteDiff v2.24.0
  [1fa38f19] Format v1.3.7
  [f6369f11] ForwardDiff v0.10.36
  [069b7b12] FunctionWrappers v1.1.3
  [77dc65aa] FunctionWrappersWrappers v0.1.3
  [d9f16b24] Functors v0.4.12
  [46192b85] GPUArraysCore v0.1.6
  [c27321d9] Glob v1.3.1
  [86223c79] Graphs v1.11.2
  [3e5b6fbb] HostCPUFeatures v0.1.17
  [34004b35] HypergeometricFunctions v0.3.24
  [615f187c] IfElse v0.1.1
  [d25df0c9] Inflate v0.1.5
  [18e54dd8] IntegerMathUtils v0.1.2
  [8197267c] IntervalSets v0.7.10
  [3587e190] InverseFunctions v0.1.16
  [92d709cd] IrrationalConstants v0.2.2
  [82899510] IteratorInterfaceExtensions v1.0.0
  [692b3bcd] JLLWrappers v1.6.0
  [682c06a0] JSON v0.21.4
  [98e50ef6] JuliaFormatter v1.0.60
  [ccbc3e58] JumpProcesses v9.13.7
  [ef3ab10e] KLU v0.6.0
  [ba0b0d4f] Krylov v0.9.6
  [b964fa9f] LaTeXStrings v1.3.1
  [984bce1d] LambertW v0.4.6
  [23fbe1c1] Latexify v0.16.5
  [10f19ff3] LayoutPointers v0.1.17
  [5078a376] LazyArrays v2.2.0
  [d3d80556] LineSearches v7.3.0
  [7ed4a6bd] LinearSolve v2.34.0
  [2ab3a3ac] LogExpFunctions v0.3.28
  [bdcacae8] LoopVectorization v0.12.171
  [d8e11817] MLStyle v0.4.17
  [1914dd2f] MacroTools v0.5.13
  [d125e4d3] ManualMemory v0.1.8
  [bb5d69b7] MaybeInplace v0.1.4
  [e1d29d7a] Missings v1.2.0
  [961ee093] ModelingToolkit v9.36.0
  [16a59e39] ModelingToolkitStandardLibrary v2.11.0
  [46d2c3a1] MuladdMacro v0.2.4
  [102ac46a] MultivariatePolynomials v0.5.6
  [d8a4904e] MutableArithmetics v1.4.6
  [d41bc354] NLSolversBase v7.8.3
  [77ba4419] NaNMath v1.0.2
  [8913a72c] NonlinearSolve v3.14.0
  [6fe1bfb0] OffsetArrays v1.14.1
  [429524aa] Optim v1.9.4
  [bac558e1] OrderedCollections v1.6.3
  [90014a1f] PDMats v0.11.31
  [65ce6f38] PackageExtensionCompat v1.0.2
  [d96e819e] Parameters v0.12.3
  [69de0a69] Parsers v2.8.1
  [e409e4f3] PoissonRandom v0.4.4
  [f517fe37] Polyester v0.7.16
  [1d0040c9] PolyesterWeave v0.2.2
  [85a6dd25] PositiveFactorizations v0.2.4
  [d236fae5] PreallocationTools v0.4.24
  [aea7be01] PrecompileTools v1.2.1
  [21216c6a] Preferences v1.4.3
  [27ebfcd6] Primes v0.5.6
  [43287f4e] PtrArrays v1.2.1
  [1fd47b50] QuadGK v2.11.0
  [74087812] Random123 v1.7.0
  [e6cf234a] RandomNumbers v1.6.0
  [3cdcf5f2] RecipesBase v1.3.4
  [731186ca] RecursiveArrayTools v3.27.0
  [f2c3362d] RecursiveFactorization v0.2.23
  [189a3867] Reexport v1.2.2
  [ae029012] Requires v1.3.0
  [ae5879a3] ResettableStacks v1.1.1
  [79098fc4] Rmath v0.7.1
  [7e49a35a] RuntimeGeneratedFunctions v0.5.13
  [94e857df] SIMDTypes v0.1.0
  [476501e8] SLEEFPirates v0.6.43
  [0bca4576] SciMLBase v2.52.0
  [c0aeaf25] SciMLOperators v0.3.10
  [53ae85a6] SciMLStructures v1.5.0
  [efcf1570] Setfield v1.1.1
  [727e6d20] SimpleNonlinearSolve v1.12.0
  [699a6c99] SimpleTraits v0.9.4
  [a2af1166] SortingAlgorithms v1.2.1
  [47a9eef4] SparseDiffTools v2.20.0
  [0a514795] SparseMatrixColorings v0.4.0
  [e56a9233] Sparspak v0.3.9
  [276daf66] SpecialFunctions v2.4.0
  [aedffcd0] Static v1.1.1
  [0d7ed370] StaticArrayInterface v1.8.0
  [90137ffa] StaticArrays v1.9.7
  [1e83bf80] StaticArraysCore v1.4.3
  [82ae8749] StatsAPI v1.7.0
  [2913bbd2] StatsBase v0.34.3
  [4c63d2b9] StatsFuns v1.3.1
  [7792a7ef] StrideArraysCore v0.5.7
  [2efcf032] SymbolicIndexingInterface v0.3.30
  [19f23fe9] SymbolicLimits v0.2.2
  [d1185830] SymbolicUtils v3.6.0
  [0c5d862f] Symbolics v6.6.0
  [3783bdb8] TableTraits v1.0.1
  [bd369af6] Tables v1.12.0
  [8ea1fca8] TermInterface v2.0.0
  [1c621080] TestItems v1.0.0
  [8290d209] ThreadingUtilities v0.5.2
  [a759f4b9] TimerOutputs v0.5.24
  [0796e94c] Tokenize v0.5.29
  [d5829a12] TriangularSolve v0.2.1
  [410a4b4d] Tricks v0.1.9
  [781d530d] TruncatedStacktraces v1.4.0
  [5c2747f8] URIs v1.5.1
  [3a884ed6] UnPack v1.0.2
  [1986cc42] Unitful v1.21.0
  [a7c27f48] Unityper v0.1.6
  [3d5dd08c] VectorizationBase v0.21.70
  [19fa3120] VertexSafeGraphs v0.2.0
  [1d5cc7b8] IntelOpenMP_jll v2024.2.1+0
  [856f044c] MKL_jll v2024.2.0+0
  [efe28fd5] OpenSpecFun_jll v0.5.5+0
⌅ [f50d1b31] Rmath_jll v0.4.3+0
  [1317d2d5] oneTBB_jll v2021.12.0+0
  [0dad84c5] ArgTools v1.1.1
  [56f22d72] Artifacts
  [2a0f44e3] Base64
  [ade2ca70] Dates
  [8ba89e20] Distributed
  [f43a241f] Downloads v1.6.0
  [7b1f6079] FileWatching
  [9fa8497b] Future
  [b77e0a4c] InteractiveUtils
  [4af54fe1] LazyArtifacts
  [b27032c2] LibCURL v0.6.4
  [76f85450] LibGit2
  [8f399da3] Libdl
  [37e2e46d] LinearAlgebra
  [56ddb016] Logging
  [d6f4376e] Markdown
  [a63ad114] Mmap
  [ca575930] NetworkOptions v1.2.0
  [44cfe95a] Pkg v1.10.0
  [de0858da] Printf
  [3fa0cd96] REPL
  [9a3f8284] Random
  [ea8e919c] SHA v0.7.0
  [9e88b42a] Serialization
  [1a1011a3] SharedArrays
  [6462fe0b] Sockets
  [2f01184e] SparseArrays v1.10.0
  [10745b16] Statistics v1.10.0
  [4607b0f0] SuiteSparse
  [fa267f1f] TOML v1.0.3
  [a4e569a6] Tar v1.10.0
  [8dfed614] Test
  [cf7118a7] UUIDs
  [4ec0a83e] Unicode
  [e66e0078] CompilerSupportLibraries_jll v1.1.1+0
  [deac9b47] LibCURL_jll v8.4.0+0
  [e37daf67] LibGit2_jll v1.6.4+0
  [29816b5a] LibSSH2_jll v1.11.0+1
  [c8ffd9c3] MbedTLS_jll v2.28.2+1
  [14a3606d] MozillaCACerts_jll v2023.1.10
  [4536629a] OpenBLAS_jll v0.3.23+4
  [05823500] OpenLibm_jll v0.8.1+2
  [bea87d4a] SuiteSparse_jll v7.2.1+1
  [83775a58] Zlib_jll v1.2.13+1
  [8e850b90] libblastrampoline_jll v5.11.0+0
  [8e850ede] nghttp2_jll v1.52.0+1
  [3f19e933] p7zip_jll v17.4.0+2
Info Packages marked with ⌅ have new versions available but compatibility constraints restrict them from upgrading. To see why use `status --outdated -m`
  • Output of versioninfo()
Julia Version 1.10.5
Commit 6f3fdf7b36 (2024-08-27 14:19 UTC)
Build Info:
  Official https://julialang.org/ release
Platform Info:
  OS: Windows (x86_64-w64-mingw32)
  CPU: 20 × 13th Gen Intel(R) Core(TM) i7-1370P
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-15.0.7 (ORCJIT, goldmont)
Threads: 1 default, 0 interactive, 1 GC (on 20 virtual cores)
Environment:
  JULIA_DEPOT_PATH = C:\Users\jaakkor2\MyTemp\mtkdebug
@jaakkor2 jaakkor2 added the bug Something isn't working label Sep 5, 2024
@baggepinnen
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This way of writing the equations does not work

connections = [
    if true # fail
        connect(dec.output, pt.input)
        connect(pt.output, dec.input)
    else # ok
        connect(dec.output, dec.input)
    end
    ]

the first branch only outputs one equation. Try

connections = if true
        [
        connect(dec.output, pt.input)
        connect(pt.output, dec.input)
        ]
    else 
        [connect(dec.output, dec.input)]
    end

instead. This is not due to MTK, this is how julia works

@jaakkor2
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jaakkor2 commented Sep 5, 2024

Thanks, trying to find a MWE of a problem, but this was too simple ;)

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