resolve CI/sudo and minor code adjustments

.azure/gpu-special-tests.yml

@@ -35,11 +35,6 @@ jobs:
           echo "##vso[task.setvariable variable=CONTAINER_ID]$(head -1 /proc/self/cgroup|cut -d/ -f3)"
         displayName: 'Set environment variables'
 
-      - script: |
-          /tmp/docker exec -t -u 0 $CONTAINER_ID \
-          sh -c "apt-get update && DEBIAN_FRONTEND=noninteractive apt-get -o Dpkg::Options::="--force-confold" -y install sudo"
-        displayName: 'Install Sudo in container (thanks Microsoft!)'
-
       - bash: |
           echo $CUDA_VISIBLE_DEVICES
           lspci | egrep 'VGA|3D'
@@ -56,7 +51,6 @@ jobs:
         displayName: 'Sanity check'
 
       - script: |
-          sudo apt-get install -y build-essential gcc cmake software-properties-common
           python -m pip install "pip==22.2.1"
           pip --version
           pip install '.[image,test]' -r requirements/testing_image.txt -U

.azure/template-examples.yml

@@ -27,11 +27,6 @@ jobs:
           echo "##vso[task.setvariable variable=CONTAINER_ID]$(head -1 /proc/self/cgroup|cut -d/ -f3)"
         displayName: 'Set environment variables'
 
-      - script: |
-          /tmp/docker exec -t -u 0 $CONTAINER_ID \
-          sh -c "apt-get update && DEBIAN_FRONTEND=noninteractive apt-get -o Dpkg::Options::="--force-confold" -y install sudo"
-        displayName: 'Install Sudo in container (thanks Microsoft!)'
-
       - bash: |
           echo $CUDA_VISIBLE_DEVICES
           lspci | egrep 'VGA|3D'
@@ -47,7 +42,6 @@ jobs:
         displayName: 'Sanity check'
 
       - script: |
-          sudo apt-get install -y build-essential gcc cmake software-properties-common
           python -m pip install "pip==22.2.1"
           pip --version
           pip install '.[${{topic}},test]' -r "requirements/testing_${{topic}}.txt" -U --prefer-binary

src/flash/core/serve/dag/order.py

@@ -458,7 +458,7 @@
         # If we have many tiny groups left, then it's best to simply iterate.
         if not is_init_sorted:
             prev_len = len(init_stack)
-            if type(init_stack) is dict:
+            if isinstance(init_stack, dict):
                 init_stack = set(init_stack)
             init_stack = set_difference(init_stack, result)
             N = len(init_stack)

src/flash/core/serve/dag/task.py

@@ -445,6 +445,6 @@
     (literal<type=tuple>,)
 
     """
-    if istask(x) or type(x) is list or type(x) is dict:
+    if istask(x) or isinstance(x, (list, dict)):
         return (literal(x),)
     return x

src/flash/core/serve/dag/utils.py

@@ -72,7 +72,7 @@
     >>> key_split('_(x)')  # strips unpleasant characters
     'x'
     """
-    if type(s) is bytes:
+    if isinstance(s, bytes):
         s = s.decode()
     if type(s) is tuple:
         s = s[0]