i am running following notebook
https://github.com/UKPLab/sentence-transformers/blob/master/examples/applications/image-search/Image_Search.ipynb
In this notebook i found that embeddings for 25k image size is just 50 MB, embedding name is unsplash-25k-photos-embeddings.pkl. How do they reduce the size of embeddings? It should be large than that for 25k high quality images right?