Sort imports for optional third-party libraries.

These libraries aren't always installed in the virtual environment where
isort is running. Declaring them properly avoids mixing these
third-party imports with local imports.

examples/distillation/utils.py

@@ -20,11 +20,10 @@ import logging
 import os
 import socket
 
+import git
 import numpy as np
 import torch
 
-import git
-
 
 logging.basicConfig(
     format="%(asctime)s - %(levelname)s - %(name)s - PID: %(process)d -  %(message)s",