Iterfix

README.md

@@ -602,27 +602,13 @@ siter = ShuffleIterator(copy(data), 2, MersenneTwister(123))
 @test size(first(siter)) == size(first(biter))
 @test first(siter) != first(biter)
 
-# Flip data along a dimension with a certain probability
-probability = 1.0
-dimension = 1
-fiter = FlipIterator(biter, probability, dimension)
-@test first(fiter) == reverse(first(biter), dims=dimension)
-
-# Randomly shift the data while cropping and padding to keep the same size
-maxshiftdim1 = 2
-maxshiftdim2 = 0
-siter = ShiftIterator(biter, maxshiftdim1,maxshiftdim2; rng = MersenneTwister(12))
-sdata = first(siter)
-@test sdata[1:1,:] == zeros(1,2)
-@test sdata[2:4,:] == first(biter)[1:3,:]
-
 # Apply a function to each batch
 miter = MapIterator(x -> 2 .* x, biter)
 @test first(miter) == 2 .* first(biter)
 
 # Move data to gpu
 giter = GpuIterator(miter)
-@test first(giter) == first(miter)
+@test first(giter) == first(miter) |> gpu
 
 labels = collect(0:5)
 

src/NaiveGAflux.jl

@@ -30,7 +30,7 @@ export evolvemodel, AbstractCandidate, CandidateModel, HostCandidate, CacheCandi
 export evolve!, AbstractEvolution, NoOpEvolution, AfterEvolution, ResetAfterEvolution, EliteSelection, SusSelection, TournamentSelection, CombinedEvolution, EvolveCandidates
 
 # misc types
-export Probability, MutationShield, ApplyIf, RemoveIfSingleInput, RepeatPartitionIterator, MapIterator, GpuIterator, BatchIterator, FlipIterator, ShiftIterator, ShuffleIterator, PersistentArray
+export Probability, MutationShield, ApplyIf, RemoveIfSingleInput, RepeatPartitionIterator, SeedIterator, MapIterator, GpuIterator, BatchIterator, FlipIterator, ShiftIterator, ShuffleIterator, PersistentArray
 
 # Persistence
 export persist, savemodels

src/app/imageclassification/ImageClassification.jl

@@ -90,7 +90,7 @@ function AutoFlux.fit(c::ImageClassifier, fit_iter, fitnessgen, evostrategy::Abs
     Random.seed!(NaiveGAflux.rng_default, c.seed)
     @info "Start training with baseseed: $(c.seed)"
 
-    insize, outsize = size(fit_iter)
+    insize, outsize = datasize(fit_iter)
 
     population = initial_models(c.popsize, mdir, c.newpop, fitnessgen, insize, outsize[1])
 
@@ -102,6 +102,10 @@ function AutoFlux.fit(c::ImageClassifier, fit_iter, fitnessgen, evostrategy::Abs
     return evolutionloop(population, evostrategy, fit_iter, cb)
 end
 
+datasize(itr) = datasize(first(itr))
+datasize(t::Tuple) = datasize.(t)
+datasize(a::AbstractArray) = size(a)
+
 function evolutionloop(population, evostrategy, trainingiter, cb)
     for (gen, iter) in enumerate(trainingiter)
         @info "Begin generation $gen"
@@ -131,6 +135,6 @@ function initial_models(nr, mdir, newpop, fitnessgen, insize, outsize)
     as = initial_archspace(insize[1:2], outsize)
     return PersistentArray(mdir, nr, i -> create_model(join(["model", i]), as, iv(i), fitnessgen))
 end
-create_model(name, as, in, fg) = CacheCandidate(HostCandidate(CandidateModel(CompGraph(in, as(name, in)), newopt(newlr(0.01)), Flux.logitcrossentropy, fg())))
+create_model(name, as, in, fg) = CacheCandidate(HostCandidate(CandidateModel(CompGraph(in, as(name, in)), newopt(rand() * 0.099 + 0.01), Flux.logitcrossentropy, fg())))
 
 end

src/app/imageclassification/strategy.jl

@@ -167,8 +167,8 @@ end
 TrainStrategy(;nepochs=200, batchsize=32, nbatches_per_gen=400, seed=123, dataaug=identity) = TrainStrategy(nepochs, batchsize, nbatches_per_gen, seed, dataaug)
 function trainiter(s::TrainStrategy, x, y)
     baseiter = dataiter(x, y, s.batchsize, s.seed, s.dataaug)
-    epochiter = Iterators.cycle(baseiter, s.nepochs)
-    return RepeatPartitionIterator(GpuIterator(epochiter), s.nbatches_per_gen)
+    partiter = RepeatPartitionIterator(GpuIterator(baseiter), s.nbatches_per_gen)
+    return Iterators.cycle(partiter, s.nepochs)
 end
 
 batch(x, batchsize, seed) = ShuffleIterator(x, batchsize, MersenneTwister(seed))

src/iterators.jl

@@ -29,27 +29,23 @@ end
 RepeatPartitionIterator(base, nrep) = RepeatPartitionIterator(Iterators.Stateful(base), nrep)
 RepeatPartitionIterator(base::Iterators.Stateful, nrep) = RepeatPartitionIterator(base, nrep)
 
-function Base.iterate(itr::RepeatPartitionIterator, state=nothing)
+function Base.iterate(itr::RepeatPartitionIterator, reset=true)
+    if reset
+        Iterators.reset!(itr.base, itr.base.itr)
+    end
     length(itr) == 0 && return nothing
-    return Iterators.take(RepeatStatefulIterator(itr.base), itr.ntake), nothing
+    return Iterators.take(RepeatStatefulIterator(itr.base), itr.ntake), false
 end
 
 Base.length(itr::RepeatPartitionIterator) = ceil(Int, length(itr.base) / itr.ntake)
 Base.eltype(itr::RepeatPartitionIterator{T}) where T = T
 Base.size(itr::RepeatPartitionIterator) = size(itr.base.itr)
 
 
-Base.IteratorSize(itr::RepeatPartitionIterator) = Base.IteratorSize(itr.base)
+Base.IteratorSize(itr::RepeatPartitionIterator) = Base.IteratorSize(itr.base.itr)
 Base.IteratorEltype(itr::RepeatPartitionIterator) = Base.HasEltype()
 
 
-"""
-    cycle(itr, nreps)
-
-An iterator that cycles through `itr nreps` times.
-"""
-Base.Iterators.cycle(itr, nreps) = Iterators.take(Iterators.cycle(itr), nreps * length(itr))
-
 struct RepeatStatefulIterator{T, VS}
     base::Iterators.Stateful{T, VS}
     start::VS
@@ -71,9 +67,56 @@ Base.length(itr::RepeatStatefulIterator) = length(itr.base.itr) - itr.taken
 Base.eltype(itr::RepeatStatefulIterator) = eltype(itr.base)
 Base.size(itr::RepeatStatefulIterator) = size(itr.base.itr)
 
-Base.IteratorSize(itr::RepeatStatefulIterator) = Base.IteratorSize(itr.base)
+Base.IteratorSize(itr::RepeatStatefulIterator) = Base.IteratorSize(itr.base.itr)
 Base.IteratorEltype(itr::RepeatStatefulIterator) = Base.HasEltype()
 
+"""
+    cycle(itr, nreps)
+
+An iterator that cycles through `itr nreps` times.
+"""
+Base.Iterators.cycle(itr, nreps) = Iterators.take(Iterators.cycle(itr), nreps * length(itr))
+
+"""
+    SeedIterator
+    SeedIterator(base; rng=rng_default, seed=rand(rng, UInt32))
+
+Iterator which has the random seed of an `AbstractRNG` as state.
+
+Calls `Random.seed!(rng, seed)` every iteration so that wrapped iterators which depend on `rng` will produce the same sequence.
+
+Useful in conjunction with [`RepeatPartitionIterator`](@ref) and random data augmentation so that all candidates in a generation are trained with identical augmentation.
+"""
+struct SeedIterator{R <: AbstractRNG,T}
+    rng::R
+    seed::UInt32
+    base::T
+end
+SeedIterator(base; rng=rng_default, seed=rand(rng, UInt32)) = SeedIterator(rng, UInt32(seed), base)
+
+function Base.iterate(itr::SeedIterator)
+    Random.seed!(itr.rng, itr.seed)
+    valstate = iterate(itr.base)
+    valstate === nothing && return nothing
+    val, state = valstate
+    return val, (itr.seed+1, state)
+end
+
+function Base.iterate(itr::SeedIterator, state)
+    seed,basestate = state
+    Random.seed!(itr.rng, seed)
+    valstate = iterate(itr.base, basestate)
+    valstate === nothing && return nothing
+    val, state = valstate
+    return val, (seed+1, state)
+end
+
+Base.length(itr::SeedIterator) = length(itr.base)
+Base.eltype(itr::SeedIterator) = eltype(itr.base)
+Base.size(itr::SeedIterator) = size(itr.base)
+
+Base.IteratorSize(itr::SeedIterator) = Base.IteratorSize(itr.base)
+Base.IteratorEltype(itr::SeedIterator) = Base.IteratorEltype(itr.base)
 
 """
     MapIterator{F, T}
@@ -167,66 +210,6 @@ Base.print(io::IO, itr::BatchIterator) = print(io, "BatchIterator(size=$(size(it
 
 Flux.onehotbatch(itr::BatchIterator, labels) = MapIterator(x -> Flux.onehotbatch(x, labels), itr)
 
-"""
-    FlipIterator{T}
-    FlipIterator(base, p::Real=0.5, dim::Int=1)
-
-Flips data from `base` along dimension `dim` with probability `p`.
-"""
-struct FlipIterator{T}
-    p::Probability
-    dim::Int
-    base::T
-end
-FlipIterator(base, p::Real=0.5, dim::Int=1) = FlipIterator(Probability(p), dim, base)
-
-Base.length(itr::FlipIterator) = length(itr.base)
-Base.size(itr::FlipIterator) = size(itr.base)
-
-Base.IteratorSize(itr::FlipIterator) = Base.IteratorSize(itr.base)
-Base.IteratorEltype(itr::FlipIterator) = Base.IteratorEltype(itr.base)
-
-Base.iterate(itr::FlipIterator) = flip(itr, iterate(itr.base))
-Base.iterate(itr::FlipIterator, state) = flip(itr, iterate(itr.base, state))
-
-flip(itr::FlipIterator, valstate) = apply(itr.p) ? flip(itr.dim, valstate) : valstate
-flip(dim::Integer, ::Nothing) = nothing
-flip(dim::Integer, (data,state)::Tuple) = reverse(data, dims=dim), state
-
-"""
-    ShiftIterator{T, S<:AbstractParSpace, R<:AbstractRNG}
-    ShiftIterator(base;rng=rng_default)
-    ShiftIterator(base, cs::Integer...;rng=rng_default)
-
-Randomly shifts data from `base` in the interval `0:cs` pixels while keeping the orignal size by cropping and padding.
-"""
-struct ShiftIterator{T, S<:AbstractParSpace, R<:AbstractRNG}
-    shift::S
-    rng::R
-    base::T
-end
-ShiftIterator(base;rng=rng_default) = ShiftIterator(base, 4,4,0,0,rng=rng)
-ShiftIterator(base, cs::Integer...;rng=rng_default) = ShiftIterator(ParSpace(UnitRange.(0, cs)), rng, base)
-
-Base.length(itr::ShiftIterator) = length(itr.base)
-Base.size(itr::ShiftIterator) = size(itr.base)
-
-Base.IteratorSize(itr::ShiftIterator) = Base.IteratorSize(itr.base)
-Base.IteratorEltype(itr::ShiftIterator) = Base.IteratorEltype(itr.base)
-
-Base.iterate(itr::ShiftIterator) = shift(itr, iterate(itr.base))
-Base.iterate(itr::ShiftIterator, state) = shift(itr, iterate(itr.base, state))
-
-shift(itr::ShiftIterator, ::Nothing) = nothing
-function shift(itr::ShiftIterator, (data,state)::Tuple)
-    s = itr.shift(itr.rng)
-    sdata = circshift(data, s)
-    for (dim, sdim) in enumerate(s)
-        selectdim(sdata, dim, 1:sdim) .= 0
-    end
-    return sdata, state
-end
-
 """
     ShuffleIterator{T<:AbstractArray, R<:AbstractRNG}
     ShuffleIterator(data, batchsize, rng=rng_default)

test/app/autoflux.jl

@@ -56,6 +56,7 @@
 
         @test sleepreti(0.01) == 0.01
         @test sleepreti(0.02) == 0.02
+        fitness(ff, x -> [1 0; 0 1]) # Avoid compiler delays?
         @test fitness(ff, x -> [1 0; 0 1]) == 0.501 #SizeFitness gives 0.001 extra
 
         sleepreti(0.4)

test/examples.jl

@@ -462,20 +462,6 @@ end
     @test size(first(siter)) == size(first(biter))
     @test first(siter) != first(biter)
 
-    # Flip data along a dimension with a certain probability
-    probability = 1.0
-    dimension = 1
-    fiter = FlipIterator(biter, probability, dimension)
-    @test first(fiter) == reverse(first(biter), dims=dimension)
-
-    # Randomly shift the data while cropping and padding to keep the same size
-    maxshiftdim1 = 2
-    maxshiftdim2 = 0
-    siter = ShiftIterator(biter, maxshiftdim1,maxshiftdim2; rng = MersenneTwister(12))
-    sdata = first(siter)
-    @test sdata[1:1,:] == zeros(1,2)
-    @test sdata[2:4,:] == first(biter)[1:3,:]
-
     # Apply a function to each batch
     miter = MapIterator(x -> 2 .* x, biter)
     @test first(miter) == 2 .* first(biter)

test/iterators.jl

@@ -35,6 +35,16 @@
     end
 end
 
+@testset "SeedIterator" begin
+    rng = MersenneTwister(123)
+    testitr = SeedIterator(MapIterator(x -> x * rand(rng, Int), ones(10)); rng=rng, seed=12)
+    @test collect(testitr) == collect(testitr)
+
+    rng = MersenneTwister(1234)
+    nesteditr = SeedIterator(MapIterator(x -> x * rand(rng, Int), testitr); rng=rng, seed=1)
+    @test collect(nesteditr) == collect(nesteditr)
+end
+
 @testset "MapIterator" begin
     itr = MapIterator(x -> 2x, [1,2,3,4,5])
     @test collect(itr) == [2,4,6,8,10]
@@ -58,24 +68,6 @@ end
     @test "biter: $itr" == "biter: BatchIterator(size=(2, 3, 4, 5), batchsize=2)"
 end
 
-@testset "FlipIterator" begin
-    itr = FlipIterator([[1 2 3 4; 5 6 7 8], [1 2; 3 4]], 1.0, 2)
-    for (act, exp) in zip(itr, [[4 3 2 1; 8 7 6 5], [2 1; 4 3]])
-        @test act == exp
-    end
-
-    itr = FlipIterator([[1 2 3 4; 5 6 7 8]], 0.0, 2)
-    @test first(itr) == [1 2 3 4; 5 6 7 8]
-end
-
-@testset "ShiftIterator" begin
-    itr = ShiftIterator([[1 2 3 4; 5 6 7 8], [5 6 7 8; 1 2 3 4]], 0, 2, rng=SeqRng(0))
-
-    for (act, exp) in zip(itr, [[0 1 2 3; 0 5 6 7], [0 5 6 7; 0 1 2 3]])
-        @test act == exp
-    end
-end
-
 @testset "ShuffleIterator ndims $(length(dims))" for dims in ((5), (3,4), (2,3,4), (2,3,4,5), (2,3,4,5,6), (2,3,4,5,6,7))
     sitr = ShuffleIterator(collect(reshape(1:prod(dims),dims...)), 2, MersenneTwister(123))
     bitr = BatchIterator(collect(reshape(1:prod(dims),dims...)), 2)

test/runtests.jl

@@ -26,6 +26,9 @@ using Test
         return vec[rng.ind]
     end
 
+    NaiveNASflux.agg(m::NaiveNASflux.Ewma, x, y) = m.α .* cpu(x) .+ (1 - m.α) .* cpu(y)
+    NaiveNASflux.agg(m::NaiveNASflux.Ewma, ::Missing, y) = cpu(y)
+
     @info "Testing util"
     include("util.jl")