add lecture 4

content/project/2017fa_ece408_project.md

@@ -32,10 +32,11 @@ caption = ""
 
 I developed new course content for University of Illinois ECE 408 / CS 483 during the 2017 fall semester.
 
-* Three lectures on machine learning ([1][l1], [2][l2], [3][l3])
+* Four lectures on machine learning ([1][l1], [2][l2], [3][l3], [4][l4])
 * A [course project][project_repo] where students add a GPU convolution operator to MXNet.
 
-[project_repo]: https://bitbucket.org/hwuligans/2017fa_ece408_project
+[project_repo]: https://github.com/webgpu/2017fa_ece408_project
 [l1]: ../../pdf/2017FA_ECE408_dl01_Intro.pdf
 [l2]: ../../pptx/2017FA_ECE408_dl02_FF-Gradient.pptx
 [l3]: ../../pptx/2017FA_ECE408_dl03_CNN01.pptx
+[l4]: ../../pptx/2017FA_ECE408_dl04_CNN02.pptx