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fix: replace json with pickle for storing lgbm params #190

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Motivation

Fixes #188, allowing the use of custom objective functions

Description of the changes

Replaces json.dumps and json.loads with pickle to store and retrieve the trials' lightgbm_params dictionary

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@github-actions github-actions bot added the stale Exempt from stale bot labeling. label Dec 31, 2024
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LightGBMTunerCV error when using custom objective function
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