🎨 (DDPM) simplify constructor

examples/swissroll.jl

@@ -38,7 +38,6 @@ scatter(dataset[1, :], dataset[2, :],
 
 num_timesteps = 100
 scheduler = DDPM(
-  Vector{Float32},
   linear_beta_schedule(num_timesteps)
 );
 

src/Schedulers/DDPM.jl

@@ -28,7 +28,7 @@ struct DDPM{V<:AbstractVector} <: Scheduler
   ⎷β̅₋₁::V # square root of β̅₋₁
 end
 
-function DDPM(V::DataType, β::AbstractVector)
+function DDPM(β::AbstractVector)
   T = length(β)
 
   α = 1 .- β
@@ -48,7 +48,7 @@ function DDPM(V::DataType, β::AbstractVector)
   ⎷α̅₋₁ = sqrt.(α̅₋₁)
   ⎷β̅₋₁ = sqrt.(β̅₋₁)
 
-  DDPM{V}(
+  DDPM{typeof(β)}(
     T,
     β,
     α,

test/Schedulers.jl

@@ -10,7 +10,6 @@ using Test
 
     # create a DDPM with a cosine beta schedule
     ddpm = Diffusers.DDPM(
-      Vector{Float32},
       Diffusers.cosine_beta_schedule(T),
     )
 
@@ -36,7 +35,6 @@ using Test
 
     # create a DDPM with a terminal SNR cosine beta schedule
     ddpm = Diffusers.DDPM(
-      Vector{Float32},
       Diffusers.rescale_zero_terminal_snr(
         Diffusers.cosine_beta_schedule(T),
       ),