Assume we built an artificial neural network in which we are…

Assume we built an artificial neural network in which we are trying to minimize the loss and the only hyper-parameter we can change is the learning rate. During the training we see that the loss is decreasing very slowly. To increase the speed of training, should we increase or decrease the learning rate?

After running PCA on a dataset, you find that: Principal Com…

After running PCA on a dataset, you find that: Principal Component 1 (PC1) explains 40% of the variance PC2 explains 30% PC3 explains 15% PC4 explains 10% PC5 explains 5% If your goal is to keep components that explain at least 90% of the total variance, how many principal components should you retain?