update Embedding constructor

Updated Embedding constructor to use `=>` and added OneHotLikeVector and OneHotLikeMatrix consts.

Author: manikyabard

src/layers/basic.jl

@@ -476,7 +476,7 @@ function Base.show(io::IO, m::Parallel)
 end
 
 """
-    Embedding(in, out; init=randn)
+    Embedding(in => out; init=randn)
 
 A lookup table that stores embeddings of dimension `out` 
 for a vocabulary of size `in`. 
@@ -511,7 +511,7 @@ end
 
 @functor Embedding
 
-Embedding(in::Integer, out::Integer; init = randn32) = Embedding(init(out, in))
+Embedding(dims::Pair{<:Integer, <:Integer}; init = randn32) = Embedding(init(last(dims), first(dims)))
 
 
 (m::Embedding)(x::Integer) = m.weight[:, x]

src/onehot.jl

@@ -33,6 +33,9 @@ const OneHotLike{T, L, N, var"N+1", I} =
   Union{OneHotArray{T, L, N, var"N+1", I},
         Base.ReshapedArray{Bool, var"N+1", <:OneHotArray{T, L, <:Any, <:Any, I}}}
 
+const OneHotLikeVector{T, L} = OneHotLike{T, L, 0, 1, T}
+const OneHotLikeMatrix{T, L, I} = OneHotLike{T, L, 1, 2, I}  
+
 _isonehot(x::OneHotArray) = true
 _isonehot(x::Base.ReshapedArray{<:Any, <:Any, <:OneHotArray{<:Any, L}}) where L = (size(x, 1) == L)
 

test/cuda/layers.jl

@@ -127,13 +127,13 @@ gpu_gradtest("PixelShuffle 2d", pixelshuffle, rand(Float32, 3, 4, 18, 3), 3)
 gpu_gradtest("PixelShuffle 1d", pixelshuffle, rand(Float32, 3, 18, 3), 3)
 
 embedding = [Flux.Embedding]
-gpu_gradtest("Embedding", embedding, [1,3,5], 5, 2)
-gpu_gradtest("Embedding repeated indices", embedding, [1,3,5,3], 5, 2)
-gpu_gradtest("Embedding integer index", embedding, 1, 5, 2)
-gpu_gradtest("Embedding 2d index", embedding, [1 2; 3 4], 5, 2)
-gpu_gradtest("Embedding OneHotVec index", embedding, OneHotVector(1, 5), 5, 2)
-gpu_gradtest("Embedding OneHotMatrix index", embedding,  OneHotMatrix([1,2,3], 5), 5, 2)
-gpu_gradtest("Embedding OneHotMatrix repeated indices", embedding, OneHotMatrix([1,2,2], 5), 5, 2)
+gpu_gradtest("Embedding", embedding, [1,3,5], 5 => 2)
+gpu_gradtest("Embedding repeated indices", embedding, [1,3,5,3], 5 => 2)
+gpu_gradtest("Embedding integer index", embedding, 1, 5 => 2)
+gpu_gradtest("Embedding 2d index", embedding, [1 2; 3 4], 5 => 2)
+gpu_gradtest("Embedding OneHotVec index", embedding, OneHotVector(1, 5), 5 => 2)
+gpu_gradtest("Embedding OneHotMatrix index", embedding,  OneHotMatrix([1,2,3], 5), 5 => 2)
+gpu_gradtest("Embedding OneHotMatrix repeated indices", embedding, OneHotMatrix([1,2,2], 5), 5 => 2)
 
 @testset "function layers" begin
   x = rand(Float32, 3,3)

test/layers/basic.jl

@@ -276,7 +276,7 @@ import Flux: activations
 
   @testset "Embedding" begin
     vocab_size, embed_size = 10, 4
-    m = Flux.Embedding(vocab_size, embed_size)
+    m = Flux.Embedding(vocab_size => embed_size)
     @test size(m.weight) == (embed_size, vocab_size)
 
     x = rand(1:vocab_size, 3)