Fixed a few issues running InverseCrossAttention_Release.ipynb

[nielsrolf]

Super cool project, thanks a lot! I had a few minor issues running the InverseCrossAttention_Release.ipynb that I fixed here, mainly installing the libraries and downloading the sample image. I thought I make a pr so that we don't all have to do this as the first step

[bloc97]

I'm not sure we would want a !pip install inside of a jupyter notebook. It is fine to use in colab as the environment is already set up, but using this with a standard jupyter can break a user's environment. !pip install ignores the jupyter kernel and all variables/settings associated with it...

Would you like to rather make a colab notebook with the pip installs instead? You can edit the readme to include it next to the last contributor for the colab notebook. Sorry for the nitpick but it's rather annoying to have to reinstall conda due to a broken environment...
Edit: Thanks for the contribution by the way!