fixup param_indices()

Author: alyst

src/types.jl

@@ -29,23 +29,19 @@ nparams(model::AbstractSem) = length(params(model))
 
 params(model::AbstractSemSingle) = params(model.imply)
 nparams(model::AbstractSemSingle) = nparams(model.imply)
+
 """
     param_indices(semobj)
-    param_indices(param_names, semobj)
 
-Returns either a dict of parameter names and their indices in `semobj`.
-If `param_names` are provided, returns a vector their indices in `semobj` instead.
+Returns a dict of parameter names and their indices in `semobj`.
 
 # Examples
 ```julia
 parind = param_indices(my_fitted_sem)
 parind[:param_name]
-
-parind = param_indices([:param_name_1, param_name_2], my_fitted_sem)
 ```
 """
-param_indices(semobj) = Dict(params(semobj) .=> 1:nparams(semobj))
-param_indices(param_names, semobj) = getindex.([Dict(params(semobj) .=> 1:nparams(semobj))], param_names)
+param_indices(semobj) = Dict(par => i for (i, par) in enumerate(params(semobj)))
 
 """
     SemLoss(args...; loss_weights = nothing, ...)