replace torchvision in Keras notebooks

tutorials/resources/scripts/prepare_imagenet.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+rm -rf imagenet/val
+mkdir imagenet/val
+tar -xf imagenet/ILSVRC2012_img_val.tar -C imagenet/val
+wget https://raw.githubusercontent.com/tensorflow/models/master/research/slim/datasets/imagenet_2012_validation_synset_labels.txt -O imagenet/val/imagenet_2012_validation_synset_labels.txt
+cd imagenet/val; find . -name "*.JPEG" | sort > images.txt
+cd imagenet/val; function zip34() { while read word3 <&3; do read word4 <&4 ; echo $word3 $word4 ; done }; zip34 3<images.txt 4<imagenet_2012_validation_synset_labels.txt | xargs -n2 -P8 bash -c 'mkdir -p $2; mv $1 $2' argv0
+cd imagenet/val; rm *.txt