1. Retrieve and load themnist_784dataset of 70,000 instances.
2. Display each digit.
3. Use PCA to retrieve the1st and 2nd principal component and output theirexplained variance ratio
4. Plot the projections of the1st and 2nd principal component onto a 1D hyperplane.
5. Use Incremental PCA to reduce the dimensionality of the MNIST dataset down to 154 dimensions.
6. Display the original and compressed digits from.