Frontend before tensor expression

docs/conf.py

@@ -189,8 +189,8 @@ examples_dirs = ["../tutorials/", "../vta/tutorials/"]
 gallery_dirs = ["tutorials", "vta/tutorials"]
 
 subsection_order = ExplicitOrder(
-    ['../tutorials/language',
-     '../tutorials/frontend',
+    ['../tutorials/frontend',
+     '../tutorials/language',
      '../tutorials/optimize',
      '../tutorials/autotvm',
      '../tutorials/dev',