Update README.md

KuntaiDu · Feb 11, 2022 · c789960 · c789960
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 # video-compression
 
-Here are the steps to run our code. We assume you start from a directory called $DIR, and your working machine contains an NVIDIA GPU.
+Here are the steps to run our code. We assume you start from a directory called ```$DIR```, and your working machine contains an NVIDIA GPU.
 
 ## Setup the environment