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Define inverse functions with InverseFunctions.jl #29

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Oct 19, 2021
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Define inverse functions with InverseFunctions.jl #29

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4 changes: 3 additions & 1 deletion Project.toml
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Original file line number Diff line number Diff line change
@@ -1,17 +1,19 @@
name = "LogExpFunctions"
uuid = "2ab3a3ac-af41-5b50-aa03-7779005ae688"
authors = ["StatsFun.jl contributors, Tamas K. Papp <tkpapp@gmail.com>"]
version = "0.3.3"
version = "0.3.4"

[deps]
ChainRulesCore = "d360d2e6-b24c-11e9-a2a3-2a2ae2dbcce4"
DocStringExtensions = "ffbed154-4ef7-542d-bbb7-c09d3a79fcae"
InverseFunctions = "3587e190-3f89-42d0-90ee-14403ec27112"
IrrationalConstants = "92d709cd-6900-40b7-9082-c6be49f344b6"
LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"

[compat]
ChainRulesCore = "1"
DocStringExtensions = "0.8"
InverseFunctions = "0.1"
IrrationalConstants = "0.1"
julia = "1"

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2 changes: 2 additions & 0 deletions src/LogExpFunctions.jl
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Expand Up @@ -4,6 +4,7 @@ using DocStringExtensions: SIGNATURES
using Base: Math.@horner

import ChainRulesCore
import InverseFunctions
import IrrationalConstants
import LinearAlgebra

Expand All @@ -14,5 +15,6 @@ export xlogx, xlogy, xlog1py, logistic, logit, log1psq, log1pexp, log1mexp, log2
include("basicfuns.jl")
include("logsumexp.jl")
include("chainrules.jl")
include("inverse.jl")

end # module
9 changes: 9 additions & 0 deletions src/inverse.jl
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@@ -0,0 +1,9 @@
InverseFunctions.inverse(::typeof(log1pexp)) = logexpm1
InverseFunctions.inverse(::typeof(logexpm1)) = log1pexp

InverseFunctions.inverse(::typeof(log1mexp)) = log1mexp

InverseFunctions.inverse(::typeof(log2mexp)) = log2mexp

InverseFunctions.inverse(::typeof(logit)) = logistic
InverseFunctions.inverse(::typeof(logistic)) = logit
11 changes: 11 additions & 0 deletions test/inverse.jl
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@@ -0,0 +1,11 @@
@testset "inverse.jl" begin
InverseFunctions.test_inverse(log1pexp, randn())
InverseFunctions.test_inverse(logexpm1, randexp())

InverseFunctions.test_inverse(log1mexp, -randexp())

InverseFunctions.test_inverse(log2mexp, log(2) - randexp())

InverseFunctions.test_inverse(logistic, randn())
InverseFunctions.test_inverse(logit, rand())
end
2 changes: 2 additions & 0 deletions test/runtests.jl
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Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
using LogExpFunctions
using ChainRulesTestUtils
using InverseFunctions
using OffsetArrays

using Random
Expand All @@ -9,3 +10,4 @@ Random.seed!(1234)

include("basicfuns.jl")
include("chainrules.jl")
include("inverse.jl")