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+README for the link & code implementation
+=========================================
+
+What is this?
+-------------
+
+Link & code is an indexing method that combines HNSW indexing with
+compression and exploits the neighborhood structure of the similarity
+graph to improve the reconstruction. It is described in
+
+```
+@inproceedings{link_and_code,
+   author = {Matthijs Douze and Alexandre Sablayrolles and Herv\'e J\'egou},
+   title = {Link and code: Fast indexing with graphs and compact regression codes},
+   booktitle = {CVPR},
+   year = {2018}
+}
+```
+
+ArXiV [here](https://arxiv.org/abs/1804.09996)
+
+The necessary code for this paper was removed from Faiss in version 1.8.0.
+For a functioning verinsion, use Faiss 1.7.4.