added conversions (#207)

Author: matbesancon

docs/src/examples/sensitivity-analysis-svm.jl

@@ -51,17 +51,12 @@ MOI.set(model, MOI.Silent(), true)
 
 # Add the variables
 
-@variable(model, ξ[1:N])
+@variable(model, ξ[1:N] >= 0)
 @variable(model, w[1:D])
 @variable(model, b);
 
 # Add the constraints.
 
-@constraint(
-    model,
-    [i in 1:N],
-    ξ[i] >= 0
-);
 @constraint(
     model,
     cons[i in 1:N],
@@ -121,7 +116,7 @@ for i in 1:N
                 y[j] * sum(w),
             )
         else
-            MOI.set(model, DiffOpt.ForwardInConstraint(), cons[j], 0.0 * sum(w))
+            MOI.set(model, DiffOpt.ForwardInConstraint(), cons[j], 0.0)
         end
     end
     DiffOpt.forward(model)

src/jump_moi_overloads.jl

@@ -2,11 +2,13 @@ function MOI.set(model::JuMP.Model, attr::ForwardInObjective, func::JuMP.Abstrac
     JuMP.check_belongs_to_model(func, model)
     return MOI.set(model, attr, JuMP.moi_function(func))
 end
+MOI.set(model::JuMP.Model, attr::ForwardInObjective, func::Number) = MOI.set(model, attr, JuMP.AffExpr(func))
 
 function MOI.set(model::JuMP.Model, attr::ForwardInConstraint, con_ref::JuMP.ConstraintRef, func::JuMP.AbstractJuMPScalar)
     JuMP.check_belongs_to_model(func, model)
     return MOI.set(model, attr, con_ref, JuMP.moi_function(func))
 end
+MOI.set(model::JuMP.Model, attr::ForwardInConstraint, con_ref::JuMP.ConstraintRef, func::Number) = MOI.set(model, attr, con_ref, JuMP.AffExpr(func))
 
 function MOI.get(model::JuMP.Model, attr::BackwardOutObjective)
     func = MOI.get(JuMP.backend(model), attr)