Lanczos README update!

Author: noahgolmant

README.md

@@ -27,14 +27,14 @@ eigenvals, eigenvecs = compute_hessian_eigenthings(model, dataloader,
  loss, num_eigenthings)
 ```
 
-This also includes a more general power iteration with deflation implementation in `power_iter.py`.
+This also includes a more general power iteration with deflation implementation in `power_iter.py`. `lanczos.py` calls a [`scipy` hook](https://docs.scipy.org/doc/scipy-0.14.0/reference/generated/scipy.sparse.linalg.eigsh.html) to a battle-tested ARPACK implementation.
 
 ## Citing this work
 If you find this repo useful and would like to cite it in a publication, here is a BibTeX entry:
 
  @misc{hessian-eigenthings,
   author = {Noah Golmant, Zhewei Yao, Amir Gholami, Michael Mahoney, Joseph Gonzalez},
-  title = {{pytorch-hessian-eigentings: efficient PyTorch Hessian eigendecomposition}},
+  title = {pytorch-hessian-eigentings: efficient PyTorch Hessian eigendecomposition},
   month = oct,
   year = 2018,
   version = {1.0},