Add similar/setindex!, update argmax/argmin
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…ng conversion methods
mcabbott
reviewed
Mar 12, 2022
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| function Base.similar(::OneHotArray{T, L}, ::Type{Bool}, dims::Dims) where {T, L} | ||
| if first(dims) == L | ||
| indices = ones(T, Base.tail(dims)) | ||
| return OneHotArray(indices, first(dims)) | ||
| else | ||
| return BitArray(undef, dims) |
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Can you say what this similar method is for?
It seems surprising to me to return something which isn't writable. Elsewhere the pattern is that the method which takes a size returns a full matrix, but without the size, a structured one:
julia> similar(Diagonal(1:3), Float32)
3×3 Diagonal{Float32, Vector{Float32}}:
0.0 ⋅ ⋅
⋅ 0.0 ⋅
⋅ ⋅ 2.09389f-37
julia> similar(Diagonal(1:3), Float32, (3,3))
3×3 Matrix{Float32}:
0.0 0.0 0.0
0.0 0.0 0.0
0.0 0.0 0.0
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| function OneHotArray(x::AbstractVector) | ||
| !_onehot_compatible(x) && error("Array is not onehot compatible") |
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What arrays do you want this to accept, which aren't AbstractVector{Bool}?
And could "not onehot compatible" explain a bit more what it means by compatible?
| cart_inds = CartesianIndex.(_indices(x), CartesianIndices(_indices(x))) | ||
| return reshape(cart_inds, (1, size(_indices(x))...)) | ||
| else | ||
| return argmax(BitArray(x); dims=dims) |
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Is copying here better than invokeing the more generic method?
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| _onehot_compatible(x::OneHotLike) = _isonehot(x) | ||
| _onehot_compatible(x::AbstractVector{Bool}) = count(x) == 1 | ||
| _onehot_compatible(x::AbstractArray{Bool}) = all(isone, reduce(+, x; dims=1)) |
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Slightly tidier, maybe:
Suggested change
| _onehot_compatible(x::AbstractArray{Bool}) = all(isone, reduce(+, x; dims=1)) | |
| _onehot_compatible(x::AbstractArray{Bool}) = all(isone, count(x; dims=1)) |
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This addresses #6. Also adds some conversion methods, and expands the arrays that the fast
hcatshould work with (as far as I can tell this should still be valid).