diff --git a/test/backend.py b/test/backend.py
index 3537a17b30..d9c0ea9bcc 100755
--- a/test/backend.py
+++ b/test/backend.py
@@ -19,7 +19,7 @@ def _test_onnx():
     model = onnx.load(file)
     netron.serve(None, model)
 
-def _test_onnx_list():
+def _test_onnx_iterate():
     folder = os.path.join(test_data_dir, 'onnx')
     for item in os.listdir(folder):
         file = os.path.join(folder, item)
@@ -32,29 +32,67 @@ def _test_onnx_list():
             address = netron.serve(file, model, verbosity='quiet')
             netron.stop(address)
 
-def _test_torchscript():
+def _test_torchscript_transformer():
+    torch = __import__('torch')
+    model = torch.nn.Transformer(nhead=16, num_encoder_layers=12)
+    trace = torch.jit.trace(model, (torch.rand(10, 32, 512), torch.rand(20, 32, 512)))
+    torch._C._jit_pass_inline(trace.graph) # pylint: disable=protected-access
+    netron.serve('transformer', trace)
+
+def _test_torchscript_resnet34():
     torch = __import__('torch')
     torchvision = __import__('torchvision')
+    model = torchvision.models.resnet34()
     # model = torchvision.models.alexnet(weights=torchvision.models.AlexNet_Weights.DEFAULT)
     # model = torchvision.models.resnet34(weights=torchvision.models.ResNet34_Weights.DEFAULT)
-    model = torchvision.models.resnet34()
     state_dict = torch.load(os.path.join(test_data_dir, 'pytorch', 'resnet34-333f7ec4.pth'))
     model.load_state_dict(state_dict)
-    args = torch.zeros([1, 3, 224, 224])
-    trace = torch.jit.trace(model, args, strict=True)
-    # graph, _ = torch.jit._get_trace_graph(model, args) # pylint: disable=protected-access
-    # torch.onnx._optimize_trace(graph, torch.onnx.OperatorExportTypes.ONNX)
-    # trace = torch.load(os.path.join(test_data_dir, 'pytorch', 'fasterrcnn_resnet50_fpn.pt'))
-    # torch.backends.quantized.engine = 'qnnpack'
-    # trace = torch.load(os.path.join(test_data_dir, 'pytorch', 'd2go.pt'))
-    # trace = torch.load(os.path.join(test_data_dir, 'pytorch', 'mobilenetv2-quant_full-nnapi.pt'))
-    # trace = torch.load(os.path.join(test_data_dir, 'pytorch', 'inception_v3_traced.pt'))
-    # trace = torch.load(os.path.join(test_data_dir, 'pytorch', 'netron_issue_920.pt'))
-    # trace = torch.load(os.path.join(test_data_dir, 'pytorch', 'bert-base-uncased.pt'))
-    # trace = torch.load(os.path.join(test_data_dir, 'pytorch', 'UNet.pt'))
-    torch._C._jit_pass_inline(trace.graph)
+    trace = torch.jit.trace(model, torch.zeros([1, 3, 224, 224]), strict=True)
+    torch._C._jit_pass_inline(trace.graph) # pylint: disable=protected-access
     netron.serve('resnet34', trace)
 
+def _test_torchscript_quantized():
+    torch = __import__('torch')
+    __import__('torchvision')
+    torch.backends.quantized.engine = 'qnnpack'
+    trace = torch.jit.load(os.path.join(test_data_dir, 'pytorch', 'd2go.pt'))
+    torch._C._jit_pass_inline(trace.graph) # pylint: disable=protected-access
+    netron.serve('d2go', trace)
+
+def _test_torchscript_inception_v3():
+    torch = __import__('torch')
+    trace = torch.jit.load(os.path.join(test_data_dir, 'pytorch', 'inception_v3_traced.pt'))
+    torch._C._jit_pass_inline(trace.graph) # pylint: disable=protected-access
+    netron.serve('inception_v3', trace)
+
+def _test_torchscript_scalar():
+    torch = __import__('torch')
+    trace = torch.load(os.path.join(test_data_dir, 'pytorch', 'netron_issue_920.pt'))
+    # trace = torch.load(os.path.join(test_data_dir, 'pytorch', 'UNet.pt'))
+    torch._C._jit_pass_inline(trace.graph) # pylint: disable=protected-access
+    netron.serve('inception_v3', trace)
+
+def _test_torchscript_tuple():
+    torch = __import__('torch')
+    __import__('torchvision')
+    trace = torch.load(os.path.join(test_data_dir, 'pytorch', 'fasterrcnn_resnet50_fpn.pt'))
+    torch._C._jit_pass_inline(trace.graph) # pylint: disable=protected-access
+    netron.serve('inception_v3', trace)
+
+def _test_torchscript_nnapi():
+    torch = __import__('torch')
+    trace = torch.load(os.path.join(test_data_dir, 'pytorch', 'mobilenetv2-quant_full-nnapi.pt'))
+    torch._C._jit_pass_inline(trace.graph) # pylint: disable=protected-access
+    netron.serve('inception_v3', trace)
+
 # _test_onnx()
-_test_torchscript()
-# _test_onnx_list()
+# _test_onnx_iterate()
+
+# _test_torchscript()
+# _test_torchscript_quantized()
+# _test_torchscript_resnet34()
+# _test_torchscript_inception_v3()
+# _test_torchscript_scalar()
+# _test_torchscript_tuple()
+# _test_torchscript_nnapi()
+_test_torchscript_transformer()