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34 lines
1.1 KiB
Julia
34 lines
1.1 KiB
Julia
using Diffusers.BetaSchedules
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using Test
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@testset "Variance schedules tests" begin
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@testset "SNR decreases monotonically" begin
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T = 1000
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β_linear = linear_beta_schedule(T)
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β_scaled_linear = scaled_linear_beta_schedule(T)
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β_cosine = cosine_beta_schedule(T)
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β_sigmoid = sigmoid_beta_schedule(T)
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β_exponential = exponential_beta_schedule(T)
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α̅_linear = cumprod(1 .- β_linear)
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α̅_scaled_linear = cumprod(1 .- β_scaled_linear)
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α̅_cosine = cumprod(1 .- β_cosine)
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α̅_sigmoid = cumprod(1 .- β_sigmoid)
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α̅_exponential = cumprod(1 .- β_exponential)
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# arxiv:2208.11970 Eq. 109
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SNR_linear = α̅_linear ./ (1 .- α̅_linear)
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SNR_scaled_linear = α̅_scaled_linear ./ (1 .- α̅_scaled_linear)
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SNR_cosine = α̅_cosine ./ (1 .- α̅_cosine)
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SNR_sigmoid = α̅_sigmoid ./ (1 .- α̅_sigmoid)
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SNR_exponential = α̅_exponential ./ (1 .- α̅_exponential)
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@test all(diff(SNR_linear) .<= 0)
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@test all(diff(SNR_scaled_linear) .<= 0)
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@test all(diff(SNR_cosine) .<= 0)
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@test all(diff(SNR_sigmoid) .<= 0)
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@test all(diff(SNR_exponential) .<= 0)
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end
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end
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