Ported torchvision detection tutorial into sphinx gallery format

Author: vfdev-5

Makefile

@@ -110,6 +110,15 @@ download:
 	wget -nv -N https://www.manythings.org/anki/deu-eng.zip -P $(DATADIR)
 	unzip -o $(DATADIR)/deu-eng.zip -d beginner_source/data/
 
+	# Download PennFudanPed dataset for intermediate_source/torchvision_tutorial.py
+	# and detection reference scripts: engine.py, utils.py ...
+	wget https://www.cis.upenn.edu/~jshi/ped_html/PennFudanPed.zip -P $(DATADIR)
+	unzip -o $(DATADIR)/PennFudanPed.zip -d intermediate_source/data/
+	wget https://raw.githubusercontent.com/pytorch/vision/main/references/detection/engine.py -P intermediate_source
+	wget https://raw.githubusercontent.com/pytorch/vision/main/references/detection/utils.py -P intermediate_source
+	wget https://raw.githubusercontent.com/pytorch/vision/main/references/detection/coco_utils.py -P intermediate_source
+	wget https://raw.githubusercontent.com/pytorch/vision/main/references/detection/coco_eval.py -P intermediate_source
+	wget https://raw.githubusercontent.com/pytorch/vision/main/references/detection/transforms.py -P intermediate_source
 
 docs:
 	make download