Update README.md

Author: r0f1

README.md

@@ -104,7 +104,7 @@ Blog post series - [1 Univariate Selection](http://blog.datadive.net/selecting-g
 [sklearn](https://scikit-learn.org/stable/modules/generated/sklearn.manifold.TSNE.html) - t-distributed Stochastic Neighbor Embedding (t-SNE), [intro](https://distill.pub/2016/misread-tsne/). Faster implementations: [lvdmaaten](https://lvdmaaten.github.io/tsne/), [MulticoreTSNE](https://github.com/DmitryUlyanov/Multicore-TSNE).  
 [sklearn](http://scikit-learn.org/stable/modules/generated/sklearn.decomposition.TruncatedSVD.html) - Truncated SVD (aka LSA).  
 [mdr](https://github.com/EpistasisLab/scikit-mdr) - Dimensionality reduction, multifactor dimensionality reduction (MDR).  
-[umap](https://github.com/lmcinnes/umap) - Uniform Manifold Approximation and Projection.  
+[umap](https://github.com/lmcinnes/umap) - Uniform Manifold Approximation and Projection, [talk](https://www.youtube.com/watch?v=nq6iPZVUxZU).  
 [FIt-SNE](https://github.com/KlugerLab/FIt-SNE) - Fast Fourier Transform-accelerated Interpolation-based t-SNE.  
 [scikit-tda](https://github.com/scikit-tda/scikit-tda) - Topological Data Analysis, [paper](https://www.nature.com/articles/srep01236), [talk](https://www.youtube.com/watch?v=F2t_ytTLrQ4).  
 
@@ -291,7 +291,7 @@ Understanding SVM Regression: [slides](https://cs.adelaide.edu.au/~chhshen/teach
 #### Clustering
 [pyclustering](https://github.com/annoviko/pyclustering) - All sorts of clustering algorithms.  
 [somoclu](https://github.com/peterwittek/somoclu) - Self-organizing map.  
-[hdbscan](https://github.com/scikit-learn-contrib/hdbscan) - Clustering algorithm.  
+[hdbscan](https://github.com/scikit-learn-contrib/hdbscan) - Clustering algorithm, [talk](https://www.youtube.com/watch?v=dGsxd67IFiU).  
 [nmslib](https://github.com/nmslib/nmslib) - Similarity search library and toolkit for evaluation of k-NN methods.  
 [buckshotpp](https://github.com/zjohn77/buckshotpp) - Outlier-resistant and scalable clustering algorithm.  
 [merf](https://github.com/manifoldai/merf) - Mixed Effects Random Forest for Clustering, [video](https://www.youtube.com/watch?v=gWj4ZwB7f3o)