install pytorch in ubuntu code example

Example 1: conda install pytorch

conda install pytorch torchvision torchaudio cudatoolkit=10.2 -c pytorch

Example 2: mac install pytorch 3.6

conda install pytorch torchvision -c pytorch

Example 3: install pytorch

NOTE: Python 3.9 users will need to add '-c=conda-forge' for installationconda install pytorch torchvision torchaudio cudatoolkit=10.2 -c pytorch