dmlc / dmlc/xgboost

Saving out QuantileDMatrix to file

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feature-request
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Description

Hi XGBoost community,

Are there any plans to add support for saving out QuantileDMatrix to file, like `DMatrix.save_binary`? Creating the `QuantileDMatrix` has been a RAM bottleneck for me, and I'm hoping to potentially decrease that by loading the QDM from file.

Thanks in advance!

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