Fixed creation NonMaxSuppression op with dynamic shapes (#4119)

* Fixed creation NonMaxSuppression op with dynamic shapes

* Fixed code style
Co-authored-by: Robert Kimball <robert.kimball@intel.com>
Co-authored-by: Scott Cyphers <diyessi@users.noreply.github.com>
Co-authored-by: Michał Karzyński <postrational@users.noreply.github.com>
Co-authored-by: Sang Ik Lee <sang.ik.lee@intel.com>

src/ngraph/op/non_max_suppression.cpp

@@ -69,6 +69,11 @@ void op::v1::NonMaxSuppression::validate_and_infer_types()
 {
     const auto boxes_ps = get_input_partial_shape(0);
     const auto scores_ps = get_input_partial_shape(1);
+    if (boxes_ps.is_dynamic() || scores_ps.is_dynamic())
+    {
+        set_output_type(0, get_input_element_type(0), PartialShape::dynamic(Rank::dynamic()));
+        return;
+    }
 
     NODE_VALIDATION_CHECK(this,
                           boxes_ps.rank().is_static() && static_cast<size_t>(boxes_ps.rank()) == 3,