Update README

Author: D-X-Y

notebooks/README.md

@@ -5,7 +5,10 @@ We provide some examples on how to use NATS-Bench in the following notebooks:
 - [`create-query-sss.ipynb`](create-query-sss.ipynb) : create the size search space and query the performance of some architectures.
 - [`find-largest.ipynb`](find-largest.ipynb) : find the largest model and report its performance on each dataset.
 - [`random-search.ipynb`](random-search.ipynb) : use random search on the topology search space of NATS-Bench
-- [`issue-7.ipynb`](issue-7.ipynb) : show how to use `find_best` function
-- [`issue-11.ipynb`](issue-11.ipynb) : show how to use `get_more_info` function
+- [`issue-7.ipynb`](issue-7.ipynb) : show how to use `find_best` function.
+- [`issue-11.ipynb`](issue-11.ipynb) : show how to use `get_more_info` function.
+- [`issue-12.ipynb`](issue-12.ipynb) : show the unique string of each candidate and remove duplicated candidates.
+- [`issue-21.ipynb`](issue-21.ipynb) : create the PyTorch model instance of an architecture candidate.
+
 
 FYI, to open and run them in your machine, execute `jupyter notebook` under the `NATS-Bench/notebooks` folder.