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img (#1000)
add images
translate img (#1003)
[Image Translation] Ch6&7 (#954)
[Image Translation] Ch13 (#960)
revise ch12 imgs
add pooling and whyconv
sync d2l-en
init commit
update object detection
fix wrong tag
revise imgs
[polish] chapter appendix tool peer review (#1024)
add jupyter img
sync appendix imgs
clean img
original img
update deep-learning-intro
fix missing figs
polish after latest preview
add ssd
add rainier img
add neural style transfer
