clean unused

Makefile

@@ -55,6 +55,7 @@ PDFIMG = $(patsubst img/%.svg, build/_build/latex/%.pdf, $(SVG)) \
 pdf: $(DEPS) $(OBJ) $(PDFIMG)
 	@echo $(PDFIMG)
 	make -C build latex
+	cp build/_build/latex/gluon_tutorials_zh.tex .
 	sed -i s/\.svg/\.pdf/g $(TEX)
 	sed -i s/\}\.gif/\_00\}.pdf/g $(TEX)
 	sed -i s/{tocdepth}{0}/{tocdepth}{1}/g $(TEX)
@@ -67,3 +68,4 @@ pdf: $(DEPS) $(OBJ) $(PDFIMG)
 
 clean:
 	rm -rf build/chapter* $(DEPS) $(PKG)
+

build/build_doc.sh

@@ -4,6 +4,21 @@
 set -x
 set -e
 
+# Clean build/chapter*/*ipynb and build/chapter*/*md that are no longer needed.
+for ch in chapter*; do
+    if ! [ -e "../$ch" ]; then
+        rm -rf $ch 
+    fi  
+    for f in $ch/*.md $ch/*.ipynb; do
+        base=$(basename $f)
+        md=${base%%.*}.md
+        echo "../$ch/$md"
+        if ! [ -e "../$ch/$md" ]; then
+            rm $f
+        fi  
+    done
+done
+
 # prepare the env
 conda env update -f build/build.yml