Conditional dep on Zygote

Author: Avik Pal

src/SparseDiffTools.jl

@@ -31,7 +31,6 @@ export  contract_color,
         ForwardColorJacCache,
         auto_jacvec,auto_jacvec!,
         num_jacvec,num_jacvec!,
-        auto_vecjac,auto_vecjac!,
         num_vecjac,num_vecjac!,
         num_hesvec,num_hesvec!,
         numauto_hesvec,numauto_hesvec!,
@@ -51,16 +50,16 @@ include("coloring/greedy_star2_coloring.jl")
 include("coloring/matrix2graph.jl")
 include("differentiation/compute_jacobian_ad.jl")
 include("differentiation/jaches_products.jl")
-include("differentiation/vecjac_products.jl")
 
 Base.@pure __parameterless_type(T) = Base.typename(T).wrapper
 parameterless_type(x) = parameterless_type(typeof(x))
 parameterless_type(x::Type) = __parameterless_type(x)
 
 function __init__()
     @require Zygote = "e88e6eb3-aa80-5325-afca-941959d7151f" begin
-        export numback_hesvec, numback_hesvec!, autoback_hesvec, autoback_hesvec!
+        export numback_hesvec, numback_hesvec!, autoback_hesvec, autoback_hesvec!, auto_vecjac,auto_vecjac!,
 
+        include("differentiation/vecjac_products_zygote.jl")
         include("differentiation/jaches_products_zygote.jl")
     end
 end