画像ファイルへのパス一覧 all_image_paths を作成：
<![CDATA[>>> all_image_paths = list(data_root.glob('*/*'))
>>> all_image_paths = [str(path) for path in all_image_paths]]]>
画像数：
<![CDATA[>>> image_count = len(all_image_paths)
>>> image_count
3670]]>
データの最初の10個を表示：
<![CDATA[>>>> all_image_paths[:10]
['/home/pi/.keras/datasets/flower_photos/roses/3624546109_8eb98f0cdb.jpg',
'/home/pi/.keras/datasets/flower_photos/roses/15032112248_30c5284e54_n.jpg',
'/home/pi/.keras/datasets/flower_photos/roses/3829990289_c0c3821e4d_m.jpg',
'/home/pi/.keras/datasets/flower_photos/roses/756943228_e15a7b2318.jpg',
'/home/pi/.keras/datasets/flower_photos/roses/21347496068_f4d3339607.jpg',
'/home/pi/.keras/datasets/flower_photos/roses/7551637034_55ae047756_n.jpg',
'/home/pi/.keras/datasets/flower_photos/roses/16018886851_c32746cb72.jpg',
'/home/pi/.keras/datasets/flower_photos/roses/12165480946_c4a3fe182d_n.jpg',
'/home/pi/.keras/datasets/flower_photos/roses/8926641787_d2515dfe8f_m.jpg',
'/home/pi/.keras/datasets/flower_photos/roses/12450781274_eb78723921.jpg']
>>> ]]>
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