update example model download script to fetch single models as commandline arg

scripts/download_example_models.sh

 #! /bin/sh
 #
-# script to download pre-trained models for the example projects
+# script to download pre-trained models for the example projects,
+# downloads all models by default or individual provide zip files by name:
+#    download_example_models.sh model_basics
 #
 # requires: curl, unzip
 #
@@ -15,6 +17,12 @@ URL=https://cloud.zkm.de/index.php/s/gfWEjyEr9X4gyY6
 SRC=example_models
 DEST=../..
 
+# download target
+DOWNLOAD="all"
+if [ "$1" != "" ] ; then
+	DOWNLOAD=$1
+fi
+
 ##### functions
 
 # download from a public NextCloud shared link
@@ -22,7 +30,12 @@ DEST=../..
 # $2: filename
 download() {
 	local path="download?path=%2F&files=$2"
-	curl -LO $URL/$path
+	RETCODE=$(curl -LO -w "%{http_code}" $URL/$path)
+	if [ "$RETCODE" != "200" ] ; then
+		echo "download failed: HTTP $RETCODE"
+		rm -rf $path
+		return
+	fi
 	mkdir -p $SRC
 	mv $path $SRC/$2
 }
@@ -33,60 +46,93 @@ download() {
 cd $(dirname "$0")
 
 # download models
-download $URL model_basics.zip
-download $URL model_basics_multi_IO.zip
-download $URL model_effnet.zip
-download $URL model_keywordspotting.zip
-download $URL model_multi_pose.zip
-download $URL model_pix2pix_edges2shoes_20epochs.zip
-download $URL models_style_transfer_640x480.zip
-download $URL model_video_matting.zip
+case "$DOWNLOAD" in
+	all)
+		echo "ka"
+		download $URL model_basics.zip
+		download $URL model_basics_multi_IO.zip
+		download $URL model_basics_frozen_graph.zip
+		download $URL model_effnet.zip
+		download $URL model_keywordspotting.zip
+		download $URL model_multi_pose.zip
+		download $URL model_pix2pix_edges2shoes_20epochs.zip
+		download $URL models_style_transfer_640x480.zip
+		download $URL model_video_matting.zip
+		;;
+	*)
+		echo "lala"
+		download $URL ${DOWNLOAD}.zip
+		;;
+esac
 
 cd "$SRC"
 
 # example_basics
-unzip model_basics.zip
-rm -rf "$DEST"/example_basics/bin/data/model
-mv model "$DEST"/example_basics/bin/data
+if [ -f model_basics.zip ] ; then
+	unzip model_basics.zip
+	rm -rf "$DEST"/example_basics/bin/data/model
+	mv model "$DEST"/example_basics/bin/data
+fi
+
+# example_basics_frozen_graph
+if [ -f model_basics_frozen_graph.zip ] ; then
+	unzip model_basics_frozen_graph.zip
+	rm -rf "$DEST"/example_basics_frozen_graph/bin/data/model.pb
+	mv model.pb "$DEST"/example_basics_frozen_graph/bin/data
+fi
 
 # example_basics_multi_IO
-unzip model_basics_multi_IO.zip
-rm -rf "$DEST"/example_basics_multi_IO/bin/data/model
-mv model "$DEST"/example_basics_multi_IO/bin/data
+if [ -f model_basics_multi_IO.zip ] ; then
+	unzip model_basics_multi_IO.zip
+	rm -rf "$DEST"/example_basics_multi_IO/bin/data/model
+	mv model "$DEST"/example_basics_multi_IO/bin/data
+fi
 
 # example_effnet
-unzip model_effnet.zip
-rm -rf "$DEST"/example_basics_efficientnet/bin/data/model
-mv model "$DEST"/example_basics_efficientnet/bin/data
+if [ -f model_effnet.zip ] ; then
+	unzip model_effnet.zip
+	rm -rf "$DEST"/example_basics_efficientnet/bin/data/model
+	mv model "$DEST"/example_basics_efficientnet/bin/data
+fi
 
 # example_keywordspotting
-unzip model_keywordspotting.zip
-rm -rf "$DEST"/example_keyword_spotting/bin/data/model
-mv model "$DEST"/example_keyword_spotting/bin/data
+if [ -f model_keywordspotting.zip ] ; then
+	unzip model_keywordspotting.zip
+	rm -rf "$DEST"/example_keyword_spotting/bin/data/model
+	mv model "$DEST"/example_keyword_spotting/bin/data
+fi
 
 # example_movenet
-unzip model_multi_pose.zip
-rm -rf "$DEST"/example_movenet/bin/data/model
-mv model "$DEST"/example_movenet/bin/data
+if [ -f model_multi_pose.zip ] ; then
+	unzip model_multi_pose.zip
+	rm -rf "$DEST"/example_movenet/bin/data/model
+	mv model "$DEST"/example_movenet/bin/data
+fi
 
 # example_pix2pix
-unzip model_pix2pix_edges2shoes_20epochs.zip
-rm -rf "$DEST"/example_pix2pix/bin/data/model
-mv model "$DEST"/example_pix2pix/bin/data
+if [ -f model_pix2pix_edges2shoes_20epochs.zip ] ; then
+	unzip model_pix2pix_edges2shoes_20epochs.zip
+	rm -rf "$DEST"/example_pix2pix/bin/data/model
+	mv model "$DEST"/example_pix2pix/bin/data
+fi
 
 # example_style_transfer
-unzip models_style_transfer_640x480.zip
-rm -rf "$DEST"/example_style_transfer/bin/data/models
-mv models "$DEST"/example_style_transfer/bin/data
+if [ -f models_style_transfer_640x480.zip ] ; then
+	unzip models_style_transfer_640x480.zip
+	rm -rf "$DEST"/example_style_transfer/bin/data/models
+	mv models "$DEST"/example_style_transfer/bin/data
+fi
 
 # example_video_matting
-unzip model_video_matting.zip
-rm -rf "$DEST"/example_video_matting/bin/data/model
-rm -rf "$DEST"/example_video_matting/bin/data/codylexi.mp4
-rm -rf "$DEST"/example_video_matting/bin/data/bg.jpg
-mv model "$DEST"/example_video_matting/bin/data
-mv codylexi.mp4 "$DEST"/example_video_matting/bin/data
-mv bg.jpg "$DEST"/example_video_matting/bin/data
+if [ -f model_video_matting.zip ] ; then
+	unzip model_video_matting.zip
+	rm -rf "$DEST"/example_video_matting/bin/data/model
+	rm -rf "$DEST"/example_video_matting/bin/data/codylexi.mp4
+	rm -rf "$DEST"/example_video_matting/bin/data/bg.jpg
+	mv model "$DEST"/example_video_matting/bin/data
+	mv codylexi.mp4 "$DEST"/example_video_matting/bin/data
+	mv bg.jpg "$DEST"/example_video_matting/bin/data
+fi
 
 # cleanup
 cd ../