Add salient_regions notebook and doc

Author: Atcold

notebook/README.md

@@ -24,7 +24,7 @@ I'm releasing them here for reference only, and you are welcome to browse them,
  - [`get_data_stats.ipynb`](get_data_stats.ipynb): show stats on the e-VDS35 data set;
  - [`model_probing.ipynb`](model_probing.ipynb)
  - [`network_bisection.ipynb`](network_bisection.ipynb): mucking around with PyTorch model graph;
- - [`salient_regions.ipynb`](salient_regions.ipynb)
+ - [`salient_regions.ipynb`](salient_regions.ipynb): implements and compute salient regions from [bojarski2017explaining](https://arxiv.org/abs/1704.07911);
  - [`stability_analysis.ipynb`](stability_analysis.ipynb)
  - [`verify_resnet.ipynb`](verify_resnet.ipynb): checks whether I'm capable to use PyTorch's ResNet18;
  - [`plot_conf.py`](plot_conf.py): `matplotlib` shared configuration.