Hierarchies of stocks

In chapter 1, you used k-means clustering to cluster companies according to their stock price movements. Now, you'll perform hierarchical clustering of the companies. You are given a NumPy array of price movements movements, where the rows correspond to companies, and a list of the company names companies. SciPy hierarchical clustering doesn't fit into a sklearn pipeline, so you'll need to use the normalize() function from sklearn.preprocessing instead of Normalizer.

linkage and dendrogram have already been imported from sklearn.cluster.hierarchy, and PyPlot has been imported as plt.

Instructions

Import normalize from sklearn.preprocessing.
Rescale the price movements for each stock by using the normalize() function on movements.
Apply the linkage() function to normalized_movements, using 'complete' linkage, to calculate the hierarchical clustering. Assign the result to mergings.
Plot a dendrogram of the hierarchical clustering, using the list companies of company names as the labels. In addition, specify the leaf_rotation=90, and leaf_font_size=6 keyword arguments as you did in the previous exercise.

Take Hint (-30xp)