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enable rand(::Union{AbstractSet,Associative}) #22228

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merged 7 commits into from
Jun 13, 2017
Merged

enable rand(::Union{AbstractSet,Associative}) #22228

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f3fada9
enable rand(::Union{AbstractSet,Associative})
rfourquet Jun 5, 2017
a183687
adjust indentation
rfourquet Jun 6, 2017
f187022
warn about linear complexity (stevengj/ararslan)
rfourquet Jun 7, 2017
078f253
avoid linear complexity for array operation
rfourquet Jun 7, 2017
2ab612e
solve compile error
rfourquet Jun 8, 2017
5c195d8
update doc (tkelman & ararslan)
rfourquet Jun 8, 2017
53e6f69
oups, bad quotes
rfourquet Jun 8, 2017
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40 changes: 29 additions & 11 deletions base/random.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -257,13 +257,21 @@ globalRNG() = GLOBAL_RNG
Pick a random element or array of random elements from the set of values specified by `S`; `S` can be

* an indexable collection (for example `1:n` or `['x','y','z']`), or
* a `Dict`, a `Set` or an `IntSet`, or
* an `Associative` or `AbstractSet` object, or
* a type: the set of values to pick from is then equivalent to `typemin(S):typemax(S)` for
integers (this is not applicable to [`BigInt`](@ref)), and to ``[0, 1)`` for floating
point numbers;

`S` defaults to [`Float64`](@ref).

!!! note
The complexity of `rand(rng, s::Union{Associative,AbstractSet})`
is linear in the length of `s`, unless an optimized method (with
constant complexity) is available (which is the case for `Dict`,
`Set` and `IntSet`). For more than a few calls, use `rand(rng,
collect(s))` instead (or `rand(rng, Dict(s))`, or `rand(rng,
Set(s))`).
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the frequent parentheticals are a bit distracting here, the "(which is the case for ...)" is the only one that wouldn't work fine as just a normal part of the sentence

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Actually even that would be fine as part of the sentence, IMO.

The complexity of rand(rng, s::Union{Associative,AbstractSet}) is linear in the length of s, unless an optimized method with constant complexity is available, which is the case for Dict, Set, and IntSet. For more than a few calls, use rand(rng, collect(s)) instead, or rand(rng, Dict(s)) or rand(rng, Set(s)) as appropriate.

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Ok thank you both, I updated. I also put this note after the examples, which seem more important to me in most of the cases.


```julia-repl
julia> rand(Int, 2)
2-element Array{Int64,1}:
Expand Down Expand Up @@ -362,9 +370,8 @@ function rand(r::AbstractRNG, t::Dict)
Base.isslotfilled(t, i) && @inbounds return (t.keys[i] => t.vals[i])
end
end
rand(t::Dict) = rand(GLOBAL_RNG, t)

rand(r::AbstractRNG, s::Set) = rand(r, s.dict).first
rand(s::Set) = rand(GLOBAL_RNG, s)

function rand(r::AbstractRNG, s::IntSet)
isempty(s) && throw(ArgumentError("collection must be non-empty"))
Expand All @@ -378,7 +385,16 @@ function rand(r::AbstractRNG, s::IntSet)
end
end

rand(s::IntSet) = rand(GLOBAL_RNG, s)
function nth(iter, n::Integer)::eltype(iter)
for (i, x) in enumerate(iter)
i == n && return x
end
end
nth(iter::AbstractArray, n::Integer) = iter[n]

rand(r::AbstractRNG, s::Union{Associative,AbstractSet}) = nth(s, rand(r, 1:length(s)))

rand(s::Union{Associative,AbstractSet}) = rand(GLOBAL_RNG, s)

## Arrays of random numbers

Expand Down Expand Up @@ -407,14 +423,16 @@ function rand!(r::AbstractRNG, A::AbstractArray, s::Union{Dict,Set,IntSet})
A
end

rand!(A::AbstractArray, s::Union{Dict,Set,IntSet}) = rand!(GLOBAL_RNG, A, s)
# avoid linear complexity for repeated calls with generic containers
rand!(r::AbstractRNG, A::AbstractArray, s::Union{Associative,AbstractSet}) = rand!(r, A, collect(s))

rand!(A::AbstractArray, s::Union{Associative,AbstractSet}) = rand!(GLOBAL_RNG, A, s)

rand(r::AbstractRNG, s::Dict{K,V}, dims::Dims) where {K,V} = rand!(r, Array{Pair{K,V}}(dims), s)
rand(r::AbstractRNG, s::Set{T}, dims::Dims) where {T} = rand!(r, Array{T}(dims), s)
rand(r::AbstractRNG, s::IntSet, dims::Dims) = rand!(r, Array{Int}(dims), s)
rand(r::AbstractRNG, s::Union{Dict,Set,IntSet}, dims::Integer...) = rand(r, s, convert(Dims, dims))
rand(s::Union{Dict,Set,IntSet}, dims::Integer...) = rand(GLOBAL_RNG, s, convert(Dims, dims))
rand(s::Union{Dict,Set,IntSet}, dims::Dims) = rand(GLOBAL_RNG, s, dims)
rand(r::AbstractRNG, s::Associative{K,V}, dims::Dims) where {K,V} = rand!(r, Array{Pair{K,V}}(dims), s)
rand(r::AbstractRNG, s::AbstractSet{T}, dims::Dims) where {T} = rand!(r, Array{T}(dims), s)
rand(r::AbstractRNG, s::Union{Associative,AbstractSet}, dims::Integer...) = rand(r, s, convert(Dims, dims))
rand(s::Union{Associative,AbstractSet}, dims::Integer...) = rand(GLOBAL_RNG, s, convert(Dims, dims))
rand(s::Union{Associative,AbstractSet}, dims::Dims) = rand(GLOBAL_RNG, s, dims)

# MersenneTwister

Expand Down
38 changes: 37 additions & 1 deletion base/test.jl
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Expand Up @@ -11,14 +11,16 @@ test set that throws on the first failure. Users can choose to wrap
their tests in (possibly nested) test sets that will store results
and summarize them at the end of the test set with `@testset`.
"""
:Test # cf. #22288
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guess this commit should be squashed then, on merge if not before

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I would say all commits can be squashed on merge, and I can squash before if prefered.


module Test

export @test, @test_throws, @test_broken, @test_skip, @test_warn, @test_nowarn
export @testset
# Legacy approximate testing functions, yet to be included
export @inferred
export detect_ambiguities
export GenericString
export GenericString, GenericSet, GenericDict

#-----------------------------------------------------------------------

Expand Down Expand Up @@ -1182,4 +1184,38 @@ Base.convert(::Type{GenericString}, s::AbstractString) = GenericString(s)
Base.endof(s::GenericString) = endof(s.string)
Base.next(s::GenericString, i::Int) = next(s.string, i)

"""
The `GenericSet` can be used to test generic set APIs that program to
the `AbstractSet` interface, in order to ensure that functions can work
with set types besides the standard `Set` and `IntSet` types.
"""
struct GenericSet{T} <: AbstractSet{T}
s::AbstractSet{T}
end

"""
The `GenericDict` can be used to test generic dict APIs that program to
the `Associative` interface, in order to ensure that functions can work
with associative types besides the standard `Dict` type.
"""
struct GenericDict{K,V} <: Associative{K,V}
s::Associative{K,V}
end

for (G, A) in ((GenericSet, AbstractSet),
(GenericDict, Associative))
@eval begin
Base.convert(::Type{$G}, s::$A) = $G(s)
Base.done(s::$G, state) = done(s.s, state)
Base.next(s::$G, state) = next(s.s, state)
end
for f in (:eltype, :isempty, :length, :start)
@eval begin
Base.$f(s::$G) = $f(s.s)
end
end
end

Base.get(s::GenericDict, x, y) = get(s.s, x, y)

end # module
22 changes: 14 additions & 8 deletions test/random.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -309,13 +309,18 @@ for rng in ([], [MersenneTwister(0)], [RandomDevice()])
ftypes = [Float16, Float32, Float64]
cftypes = [Complex32, Complex64, Complex128, ftypes...]
types = [Bool, Char, Base.BitInteger_types..., ftypes...]
collections = [IntSet(rand(1:100, 20)) => Int,
Set(rand(Int, 20)) => Int,
Dict(zip(rand(Int,10), rand(Int, 10))) => Pair{Int,Int},
1:100 => Int,
rand(Int, 100) => Int,
Int => Int,
Float64 => Float64]
randset = Set(rand(Int, 20))
randdict = Dict(zip(rand(Int,10), rand(Int, 10)))
collections = [IntSet(rand(1:100, 20)) => Int,
randset => Int,
GenericSet(randset) => Int,
randdict => Pair{Int,Int},
GenericDict(randdict) => Pair{Int,Int},
1:100 => Int,
rand(Int, 100) => Int,
Int => Int,
Float64 => Float64]

b2 = big(2)
u3 = UInt(3)
for f in [rand, randn, randexp]
Expand Down Expand Up @@ -352,7 +357,8 @@ for rng in ([], [MersenneTwister(0)], [RandomDevice()])
end
end
end
for C in [1:0, Dict(), Set(), IntSet(), Int[]]
for C in [1:0, Dict(), Set(), IntSet(), Int[],
GenericDict(Dict()), GenericSet(Set())]
@test_throws ArgumentError rand(rng..., C)
@test_throws ArgumentError rand(rng..., C, 5)
end
Expand Down