Fix element type for create_tensor of cached fprop nodes in backprop_derivative (#862)

test/autodiff.in.cpp

@@ -1015,7 +1015,7 @@ TEST(${BACKEND_NAME}, backwards_reshape)
     EXPECT_TRUE(autodiff_numeric_compare<float>(backend, make_graph, {x0}, .01f, .01f));
 }
 
-TEST(DISABLED_${BACKEND_NAME}, backwards_select)
+TEST(${BACKEND_NAME}, backwards_select)
 {
     SKIP_TEST_FOR("GPU", "${BACKEND_NAME}");
     SKIP_TEST_FOR("NNP_TESTER", "${BACKEND_NAME}");
@@ -1044,7 +1044,7 @@ TEST(DISABLED_${BACKEND_NAME}, backwards_select)
     }
 }
 
-TEST(DISABLED_${BACKEND_NAME}, backwards_select_nested)
+TEST(${BACKEND_NAME}, backwards_select_nested)
 {
     SKIP_TEST_FOR("GPU", "${BACKEND_NAME}");
     SKIP_TEST_FOR("NNP_TESTER", "${BACKEND_NAME}");

test/util/autodiff/backprop_derivative.hpp

@@ -179,7 +179,7 @@ namespace ngraph
             // add cached nodes to both modified f output and modified f' input arguments
             for (auto node : fprop_cache.fprop_output_nodes)
             {
-                auto tv = backend->create_tensor<T>(node->get_shape());
+                auto tv = backend->create_tensor(node->get_element_type(), node->get_shape());
                 mod_f_output_args.push_back(tv);
                 mod_df_input_args.push_back(tv);
             }