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🧪 (Schedulers) add get_velocity tests
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@ -1,8 +1,9 @@
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import Diffusers: reverse, forward, DDPM, cosine_beta_schedule
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import Diffusers: reverse, forward, get_velocity, DDPM, cosine_beta_schedule, VELOCITY
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import Statistics: mean, std
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using Test
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@testset "Schedulers tests" begin
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@testset "check `reverse` correctness" begin
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T = 10
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batch_size = 8
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@ -15,15 +16,36 @@ using Test
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x₀ = ones(Float32, size, size, batch_size)
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ϵ = randn(Float32, size, size, batch_size)
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for t in 1:T
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t = ones(UInt32, batch_size) .* t
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# corrupt x₀ with noise
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xₜ = forward(ddpm, x₀, ϵ, t)
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# suppose a model predicted ϵ perfectly
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_, x̂₀ = reverse(ddpm, xₜ, ϵ, t)
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# test that we recover x₀
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@test x̂₀ ≈ x₀
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@testset "PredictionType == EPSILON" begin
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for t in 1:T
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t = ones(UInt32, batch_size) .* t
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# get xₜ from forward diffusion process
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xₜ = forward(ddpm, x₀, ϵ, t)
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# suppose a model predicted ϵ perfectly
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ϵᵧ = ϵ
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# use reverse diffusion process to retreive x̂₀
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_, x̂₀ = reverse(ddpm, xₜ, ϵᵧ, t)
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# test that we recover x₀
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@test x̂₀ ≈ x₀
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end
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end
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@testset "PredictionType == VELOCITY" begin
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for t in 1:T
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t = ones(UInt32, batch_size) .* t
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# get xₜ from forward diffusion process
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xₜ = forward(ddpm, x₀, ϵ, t)
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# compute vₜ to train model
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vₜ = get_velocity(ddpm, x₀, ϵ, t)
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# suppose a model predicted vₜ perfectly
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vᵧ = vₜ
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# use reverse diffusion process to retreive x̂₀
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_, x̂₀ = Diffusers.reverse(ddpm, xₜ, vₜ, t, VELOCITY)
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# test that we recover x₀
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@test x̂₀ ≈ x₀
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end
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end
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end
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@testset "check `forward` terminal SNR" begin
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@ -45,4 +67,5 @@ using Test
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@test std(xₜ) ≈ 1.0 atol = 1.0f-3
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@test mean(xₜ) ≈ 0.0 atol = 1.0f-2
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end
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end
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