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A new forward_distmat method to accelerate distance matrix computing among images. #101

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A new forward_distmat method to accelerate distance matrix computing among images. #101

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Commits on Apr 23, 2022

  1. Add another forward function to compute distance matrix with one or t… 

    …wo stack of images.

Rationale: It reuses the features computed for images, so it largely accelerates the speed of computing a large distance matrix among a set of images.
Memory usage. We choose to compute the matrix row by row, such that the memory footprint shall be still linear in the number of images instead of quadratic.
TODO: it could be extended to compute a few rows in a batch. Batch size need to be choose w.r.t. memory
    @Animadversio
    Animadversio committed Apr 23, 2022
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