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High performance model preprocessing library on PyTorch

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Ngram is a very useful method for mixing sparse features. Any plans to bring it into torcharrow?

Doc link: https://docs.google.com/document/d/115_JxxYTibTRBw4l92O75auRpQr8KvKlwsGNG54l4mA/

api

PyVelox package is gated with CMake flags in this pr. This refactoring will allow Torcharrow and Koski to use a common set of bindings.

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Summary: `dtypes.promote()` is not typed. Fix it Differential Revision: D40330862

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Summary: Generalizing it for reusing it in different contexts. Also changing to global-instance-as-singleton pattern, so that we can instantiate instances for different use cases without worrying about mis-sharing the class...

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Is this project abandoned or it will be ported to python 3.12 at some point?

Config file is opened but never closed which leads to a resource leak.

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sigmoid(x) = 1 / (1+exp(-x)) The original implementation does not have `-`.

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