Update setup.md

Author: sarthakpati

docs/setup.md

@@ -11,7 +11,7 @@
 conda create -n venv_gandlf python=3.6 -y
 conda activate venv_gandlf
 conda install -c conda-forge mamba # allows for faster dependency solving
-conda install -c pytorch pytorch torchvision -y # 1.8.0 installs cuda 10.2 by default, personalize based on your cuda/driver availability via https://pytorch.org/get-started/locally/
+mamba install -c pytorch pytorch torchvision -y # 1.8.0 installs cuda 10.2 by default, personalize based on your cuda/driver availability via https://pytorch.org/get-started/locally/
 mamba install -c conda-forge gandlf -y
 ```