Add example YoloX Nano

Author: jpablomch

examples/bootstrapNAS/yolox-nano/README.md

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+# YoloX-NAS
+
+----
+### Prepare Dataset 
+```
+cd /data/dataset/
+wget http://host.robots.ox.ac.uk/pascal/VOC/voc2007/VOCtrainval_06-Nov-2007.tar
+tar xf VOCtrainval_06-Nov-2007.tar
+mkdir voc2007_coco
+cd voc2007_coco
+
+wget https://raw.githubusercontent.com/yukkyo/voc2coco/master/voc2coco.py
+mkdir annotations
+ln -s ../VOCdevkit/VOC2007/Annotations .
+ln -s ../VOCdevkit/VOC2007/ImageSets .
+```
+
+Add class_list.txt to this directory.
+
+```
+python3 voc2coco.py --ann_dir Annotations/ --ann_ids ImageSets/Main/train.txt --labels class_list.txt --output annotations/instances_train.json --ext xml --extract_num_from_imgid
+python3 voc2coco.py --ann_dir Annotations/ --ann_ids ImageSets/Main/val.txt   --labels class_list.txt --output annotations/instances_val.json   --ext xml --extract_num_from_imgid
+
+ln -s ../VOCdevkit/VOC2007/JPEGImages/ train2017
+ln -s ../VOCdevkit/VOC2007/JPEGImages/ val2017
+
+**change to working directory.**
+
+git clone https://github.com/Megvii-BaseDetection/YOLOX.git && cd YOLOX
+git checkout -b bootstrapnas bb9185c095dfd7a8015a1b82f3e9a065090860b8
+git apply < /path/to/yolox-bootstrapnas.patch
+
+cd datasets && ln -s ../../VOCdevkit/VOC2007 && cd -
+cd datasets && ln -s /data/dataset/voc2007_coco/ VOC2007 && cd -
+
+poetry config --local virtualenvs.in-project true
+poetry install
+poetry shell
+
+
+#train without BootstrapNAS to get pretrained weight
+wget https://github.com/Megvii-BaseDetection/YOLOX/releases/download/0.1.1rc0/yolox_nano.pth
+C=yolox_nano.pth
+PYTHONPATH=. nohup 2>&1 python tools/train.py -f exps/default/yolox_nano_voc-e50.py -d 1 -b 6 -o -c $C --cache
+
+#train with BootstrapNAS using pretrained initial weight
+C=YOLOX_outputs/yolox_nano_voc-e50/best_ckpt.pth
+PYTHONPATH=. nohup 2>&1 python tools/train.py -f exps/default/first_try.py -d 1 -b 6 -o -c $C --cache --nncf_config_path nncf_config_yolox_bootstrapNAS.json
+```

examples/bootstrapNAS/yolox-nano/class_list.txt

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+aeroplane
+bicycle
+bird
+boat
+bottle
+bus
+car
+cat
+chair
+cow
+diningtable
+dog
+horse
+motorbike
+person
+pottedplant
+sheep
+sofa
+train
+tvmonitor