Add dlrm tutorial (#531)

Summary:
Adding DLRM tutorial and the KDD presentation slides related to it.
The actual model is 2.1GB, which it pretty big. Git allows 100MB maximum. Either we need to override max size or put the model elsewhere.

Update
............
Storing the model on aws S3

Pull Request resolved: #531

Reviewed By: vivekmig

Differential Revision: D25730733

Pulled By: NarineK

fbshipit-source-id: 318c7b606f3fb98d245d9a381fc92c4e21819209

Author: NarineK

README.md

@@ -412,6 +412,8 @@ See the [CONTRIBUTING](CONTRIBUTING.md) file for how to help out.
 ## Talks and Papers
 The slides of our presentation from NeurIPS 2019 can be found [here](docs/presentations/Captum_NeurIPS_2019_final.key)
 
+The slides of our presentation from KDD 2020 tutorial can be found [here](https://pytorch-tutorial-assets.s3.amazonaws.com/Captum_KDD_2020.pdf)
+
 ## References of Algorithms
 
 * `IntegratedGradients`, `LayerIntegratedGradients`: [Axiomatic Attribution for Deep Networks, Mukund Sundararajan et al. 2017](https://arxiv.org/abs/1703.01365) and [Did the Model Understand the Question?, Pramod K. Mudrakarta, et al. 2018](https://arxiv.org/abs/1805.05492)

tutorials/DLRM_Tutorial.ipynb

@@ -46,6 +46,10 @@
     {
       "id": "Multimodal_VQA_Captum_Insights",
       "title": "Using Captum Insights with multimodal models (VQA)"
+    },
+    {
+      "id": "DLRM_Tutorial",
+      "title": "Interpreting Deep Learning Recommender Models"
     }
   ]
 }