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🧪 (BetaSchedules) replace β monoticity check by SNR monoticity check

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Laureηt 2023-08-07 20:52:57 +02:00
parent 0db38f3e01
commit 77961913ba
Signed by: Laurent
SSH key fingerprint: SHA256:kZEpW8cMJ54PDeCvOhzreNr4FSh6R13CMGH/POoO8DI
1 changed files with 16 additions and 5 deletions
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21
test/BetaSchedules.jl
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@ -2,7 +2,7 @@ using Diffusers.BetaSchedules
using Test
@testset "Variance schedules tests" begin
@testset "β increases monotonically" begin
@testset "SNR decreases monotonically" begin
T = 1000
β_linear = linear_beta_schedule(T)
@ -10,9 +10,20 @@ using Test
β_cosine = cosine_beta_schedule(T)
β_sigmoid = sigmoid_beta_schedule(T)
@test all(diff(β_linear) .>= 0)
@test all(diff(β_scaled_linear) .>= 0)
@test all(diff(β_cosine) .>= 0)
@test all(diff(β_sigmoid) .>= 0)
α̅_linear = cumprod(1 .- β_linear)
α̅_scaled_linear = cumprod(1 .- β_scaled_linear)
α̅_cosine = cumprod(1 .- β_cosine)
α̅_sigmoid = cumprod(1 .- β_sigmoid)
# arxiv:2208.11970 (eq. 109)
SNR_linear = α̅_linear ./ (1 .- α̅_linear)
SNR_scaled_linear = α̅_scaled_linear ./ (1 .- α̅_scaled_linear)
SNR_cosine = α̅_cosine ./ (1 .- α̅_cosine)
SNR_sigmoid = α̅_sigmoid ./ (1 .- α̅_sigmoid)
@test all(diff(SNR_linear) .<= 0)
@test all(diff(SNR_scaled_linear) .<= 0)
@test all(diff(SNR_cosine) .<= 0)
@test all(diff(SNR_sigmoid) .<= 0)
end
end