remove six import

Author: amueller

mglearn/plot_interactive_tree.py

@@ -3,7 +3,7 @@
 
 from sklearn.tree import DecisionTreeClassifier
 
-from sklearn.externals.six import StringIO  # doctest: +SKIP
+from io import StringIO
 from sklearn.tree import export_graphviz
 from imageio import imread
 from scipy import ndimage

preamble.py

@@ -6,7 +6,7 @@
 from cycler import cycler
 
 set_matplotlib_formats('pdf', 'png')
-plt.rcParams['figure.dpi'] = 300
+plt.rcParams['savefig.dpi'] = 300
 plt.rcParams['image.cmap'] = "viridis"
 plt.rcParams['image.interpolation'] = "none"
 plt.rcParams['savefig.bbox'] = "tight"