What does the n_jobs=-1 means do when creating a XGBClassifier object?
xgbc = XGBClassifier(n_jobs=-1)
What does n_jobs=-1 do in XGBClassifier from xgboost?
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The n_jobs parameter defines the number of parallel threads to run xgboost. When passing "-1" to the "n_jobs" parameter, the computation will be dispatched to all parallel threads available in the computer.
You can get more details from the official API Reference: https://xgboost.readthedocs.io/en/stable/python/python_api.html#xgboost.XGBClassifier