add description

Author: Artem Babenko

README.md

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 # Spoc
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+This script requires Yael library (https://github.com/jackculpepper/yael).
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+This script gets a .fvecs file of 1491 * 37 * 37 512-dimensional vectors, which are an output of the last convolutional layer of VGG-19 network on the Holidays dataset and computes SPoC descriptors.