dpi issue fixes

rerun 05 with newer ipython to fix dpi in gridsearch overview.
fix preamble to use figure.dpi not savefig.dpi

Author: amueller

05-model-evaluation-and-improvement.ipynb

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