Add 'unnormalized' discriptor

demos/mgvi_visualized.py

@@ -62,13 +62,13 @@ if __name__ == '__main__':
     z = np.exp(-1*np_ham(xx, yy))
     plt.plot(y, np.sum(z, axis=0))
     plt.xlabel('y')
-    plt.ylabel('pdf')
+    plt.ylabel('unnormalized pdf')
     plt.title('Marginal density')
     plt.pause(2.0)
     plt.close()
     plt.plot(x*scale, np.sum(z, axis=1))
     plt.xlabel('x')
-    plt.ylabel('pdf')
+    plt.ylabel('unnormalized pdf')
     plt.title('Marginal density')
     plt.pause(2.0)
     plt.close()