[ONNX] Enable softmax test (#2333)

* [ONNX] Enable softmax test

* Update onnx_import.in.cpp

* change __expf to exp for accuracy

src/ngraph/runtime/gpu/gpu_cuda_kernel_builder.cpp

@@ -311,7 +311,7 @@ void runtime::gpu::CudaKernelBuilder::get_softmax_op(codegen::CodeWriter& writer
                                                      size_t reduce_rank)
 {
     auto stable_sum_lambda = [&]() {
-        writer << "input_i = __expf(input_i - r_max);\n";
+        writer << "input_i = exp(input_i - r_max);\n";
         writer << "y = input_i - c;\n";
         writer << "t = r_sum + y;\n";
         writer << "c = (t - r_sum) - y;\n";
@@ -321,7 +321,7 @@ void runtime::gpu::CudaKernelBuilder::get_softmax_op(codegen::CodeWriter& writer
     auto max_lambda = [&]() { writer << "r_max = r_max > input_i ? r_max : input_i;\n"; };
 
     auto divide_lambda = [&]() {
-        writer << "input_i = __expf(input_i - r_max) / r_sum;\n";
+        writer << "input_i = exp(input_i - r_max) / r_sum;\n";
         writer << "out[reduce_idx] = input_i;\n";
     };
     writer << runtime::gpu::nvrtc::helpers();
@@ -537,7 +537,7 @@ void runtime::gpu::CudaKernelBuilder::get_softmax_block_reduce_op(
     };
 
     auto stable_sum_lambda = [&]() {
-        writer << "input_i = __expf(input_i - r_max);\n";
+        writer << "input_i = exp(input_i - r_max);\n";
         writer << "y = input_i - c;\n";
         writer << "t = r_sum + y;\n";
         writer << "c = (t - r_sum) - y;\n";
@@ -547,7 +547,7 @@ void runtime::gpu::CudaKernelBuilder::get_softmax_block_reduce_op(
     auto max_lambda = [&]() { writer << "r_max = r_max > input_i ? r_max : input_i;\n"; };
 
     auto divide_lambda = [&]() {
-        writer << "input_i = __expf(input_i - r_max) / r_sum;\n";
+        writer << "input_i = exp(input_i - r_max) / r_sum;\n";
         writer << "out[input_idx] = input_i;\n";
     };
 

test/onnx_import.in.cpp

@@ -473,7 +473,7 @@ TEST(onnx_${BACKEND_NAME}, model_matmul)
     EXPECT_TRUE(test::all_close_f(expected_outputs.front(), outputs.front()));
 }
 
-TEST(onnx_${BACKEND_NAME}, DISABLED_model_softmax)
+TEST(onnx_${BACKEND_NAME}, model_softmax)
 {
     auto function =
         onnx_import::import_onnx_model(file_util::path_join(SERIALIZED_ZOO, "onnx/softmax.onnx"));