add draft lecture 4 materials

jphall663 · Jun 10, 2020 · 30597a1 · 30597a1
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diff --git a/.gitignore b/.gitignore
@@ -16,4 +16,5 @@ tests/out*
 *.synctex.gz
 *.toc
 best_mgbm*
-
+black_box*
+extracted_dt*