What k is good for retrieval in RAG? Make it adaptive!

[[poster]](https://drive.google.com/file/d/1TyvF1uuU_ccJnS7ovm0IyRjPc4Qy4wBt/view?usp=sharing) [[report]](https://drive.google.com/file/d/1FHmFra5Mm94TL0k05cNfxxotDPnzfGUU/view?usp=drive_link)