Fix bug

Author: PaulZhang12

.github/workflows/unittest_ci.yml

@@ -90,7 +90,7 @@ jobs:
 
   # download from GHA, test on gpu
   test_on_gpu:
-    runs-on: ${{ matrix.os }}i
+    runs-on: ${{ matrix.os }}
     timeout-minutes: 45
     strategy:
       matrix: