Add DIM operator to reference model

Signed-off-by: Won Jeon <won.jeon@arm.com>
Change-Id: Iea11ee5d3d98773e9c5e9b827593c05afb41ce3b
diff --git a/reference_model/src/ops/op_factory.cc b/reference_model/src/ops/op_factory.cc
index a3069dc..d834b74 100644
--- a/reference_model/src/ops/op_factory.cc
+++ b/reference_model/src/ops/op_factory.cc
@@ -419,6 +419,15 @@
             DEF_FACTORY_RANK1_6_ONE_RANK_ONE_TYPE(OpPad, BOOL);
             DEF_FACTORY_RANK1_6_ONE_RANK_ONE_TYPE(OpPad, FP64);
             break;
+        case Op_DIM:
+            DEF_FACTORY_RANK1_6_ONE_RANK_ONE_TYPE(OpDim, FP16);
+            DEF_FACTORY_RANK1_6_ONE_RANK_ONE_TYPE(OpDim, BF16);
+            DEF_FACTORY_RANK1_6_ONE_RANK_ONE_TYPE(OpDim, FP32);
+            DEF_FACTORY_RANK1_6_ONE_RANK_ONE_TYPE(OpDim, INT32);
+            DEF_FACTORY_RANK1_6_ONE_RANK_ONE_TYPE(OpDim, INT8);
+            DEF_FACTORY_RANK1_6_ONE_RANK_ONE_TYPE(OpDim, INT16);
+            DEF_FACTORY_RANK1_6_ONE_RANK_ONE_TYPE(OpDim, BOOL);
+            break;
         case Op_RESHAPE:
             DEF_FACTORY_RESHAPE(OpReshape, FP16);
             DEF_FACTORY_RESHAPE(OpReshape, BF16);