update machine learning

Author: zingale

www/index.html

@@ -689,11 +689,14 @@ <h2>Machine Learning</h2>
 
             Lecture slides:
             <ul>
-              <!-- <li><a href="lectures/machine-learning.pdf">testing.pdf</a></li> -->
+              <li><a href="lectures/machine-learning.pdf">machine-learning.pdf</a></li>
             </ul>
 
-
-            Examples:
+	    Examples:
+	    <ul>
+              <li>steepest (gradient) descent: <a href="https://github.com/sbu-python-class/python-science/blob/master/examples/machine-learning/steepest_descent/steepest_descent.py">steepest_descent.py</a></li>
+              <li>character recognition: <a href="https://github.com/sbu-python-class/python-science/blob/master/examples/machine-learning/character_recognition/char_recognition.py">char_recognition.py</a></li>
+            </ul>
 
           </div>
         </div>