revert to type hint

because init keyword does not work with Zygote.

Author: bgctw

src/elbo.jl

@@ -246,7 +246,9 @@ function compute_priors_logdensity(priorsP, priorsM, θP, θMs, zero_prior_logde
             #TRET = Base.return_types(logpdf_tv_sum, Tuple{typeof(priorsM[i]), typeof(θMs[:,i])})
         end
     end
-    nlMs_sum = sum(f_col, 1:length(priorsM), init = zero(nlP0)) #::typeof(nlP0) # not type inferred in julia 1.10
+    # init keyword does not work with Zygote
+    #nlMs_sum = sum(f_col, 1:length(priorsM), init = zero(nlP0)) 
+    nlMs_sum = sum(f_col, 1:length(priorsM))::typeof(nlP0) # not type inferred in julia 1.10
     neg_log_prior_i = nlP0 - nlMs_sum
     if !isfinite(neg_log_prior_i)
         @show neg_log_prior_i, nlP0