now both way conversions are ok

lib/OpenFstConvert.jl

@@ -12,7 +12,8 @@ _SemiringToWeightType = Dict([
     (SR.LogSemiring{Float64,-1}, (OF.Log64Weight, 1)),
     (SR.LogSemiring{Float32,Inf}, (OF.TropicalWeight, -1)),
     (SR.LogSemiring{Float32,-Inf}, (OF.TropicalWeight, 1)),
-    (SR.TropicalSemiring{Float32}, (OF.TropicalWeight, 1))
+    (SR.TropicalSemiring{Float32}, (OF.TropicalWeight, 1)),
+
 ])
 
 # Converts from OpenFst weight to TensorFSTs semiring
@@ -66,22 +67,22 @@ end
 numstates(A::TF.TensorFST{S})  where S <: SR.Semiring = length(states(A))
 numarcs(A::TF.TensorFST{S},q)  where S <: SR.Semiring = length(arcs_from_q(A,q))
 
-# function TF.TensorFST(ofst::OF.Fst{W}) where W <: OF.Weight
-#     S = _WeightToSemiringType[W] 
-#     tfst = TF.VectorFST{S}()
-#     for s in OF.states(ofst)
-#         TF.addstate!(tfst)
-#         final = S(OF.final(ofst, s))
-#         TF.setfinal!(tfst, s, final)
-#         for a in OF.arcs(ofst, s)
-#             arc = TF.Arc(Int(a.ilabel), Int(a.olabel), S(a.weight), 
-#                         Int(a.nextstate))
-#             TF.addarc!(tfst, s, arc)
-#         end
-#     end
-#     TF.setstart!(tfst, OF.start(ofst))
-#     return tfst
-# end
+function TF.TensorFST(ofst::OF.Fst{W}) where W <: OF.Weight
+    S = _WeightToSemiringType[W] 
+    myarcs = []
+    for s in OF.states(ofst)
+        for a in OF.arcs(ofst, s)
+            push!(myarcs, 
+                (src = convert(Int64, s), isym = convert(Int64, a.ilabel)-1, osym = convert(Int64, a.olabel)-1, weight = S(a.weight), dest = convert(Int64, a.nextstate))
+            )
+        end
+    end
+
+    tfst = TF.TensorFST(myarcs, 
+                        [(convert(Int64, OF.start(ofst)),) => S(1)], 
+                        [(convert(Int64,s),) => S(OF.final(ofst, s)) for s in OF.states(ofst)])
+	return tfst
+end
 
 
 function OF.VectorFst(tfst::TF.TensorFST{S}) where S <: SR.Semiring
@@ -96,8 +97,8 @@ function OF.VectorFst(tfst::TF.TensorFST{S}) where S <: SR.Semiring
         OF.setfinal!(ofst, s, final_w)
         OF.reservearcs(ofst, s, numarcs(tfst, s))
         for a in arcs_from_q(tfst, s)
-            arc = OF.Arc(ilabel = a.isym, 
-                        olabel = a.osym,
+            arc = OF.Arc(ilabel = a.isym+1, 
+                        olabel = a.osym+1,
                         weight = _semiring_to_weight(a.weight, sgn), 
                         nextstate = a.dest[1])
             OF.addarc!(ofst, s, arc)