[Relay][Frontend][ONNX] Remove the 'try catch' block

tests/python/frontend/onnx/test_forward.py

@@ -146,8 +146,7 @@ def verify_depth_to_space(inshape, outshape, mode, blockSize):
     node = onnx.helper.make_node('DepthToSpace',
                                  inputs=['x'],
                                  outputs=['y'],
-                                 blocksize=blockSize,
-                                 mode=mode)
+                                 blocksize=blockSize)
 
     graph = helper.make_graph([node],
                               "depth_to_space_test",
@@ -164,12 +163,11 @@ def verify_depth_to_space(inshape, outshape, mode, blockSize):
 
 
 def test_depth_to_space():
-    # CRD mode
+    # current onnx.checker use OpSet-1 version of DepthToSpace, which doesn't have a mode argument.
+    # TO-DO, we can add mode arguement to test CRD mode and DCR mode
+    # in the future when we update to a newer onnx version.
     verify_depth_to_space((1, 8, 2, 3), (1, 2, 4, 6), mode="CRD", blockSize=2)
 
-    # DCR mode
-    verify_depth_to_space((1, 8, 2, 3), (1, 2, 4, 6), mode="DCR", blockSize=2)
-
 
 def verify_space_to_depth(inshape, outshape, blockSize):
     node = onnx.helper.make_node('SpaceToDepth',