How to classify photos in 600 classes using nine million Open Images

If you're looking build an image classifier but need training data, look no further than Google Open Images. This massive image dataset contains over 30 million images and 15 million bounding boxes. Plus, Open Images is much more open and accessible than certain other image datasets at this scale. For example, ImageNet has restrictive licensing. However, it's not easy for developers on single machines to sift through that much data.You need to download and process multiple metadata files, and roll their own storage space (or apply for access to a Google Cloud bucket).