customized evaluation function provided by user.
customized evaluation function provided by user. default: null
customized objective function provided by user.
customized objective function provided by user. default: null
the value treated as missing.
the value treated as missing. default: Float.NaN
number of workers used to train xgboost model.
number of workers used to train xgboost model. default: 1
number of threads used by per worker.
number of threads used by per worker. default 1
The number of rounds for boosting
0 means printing running messages, 1 means silent mode.
0 means printing running messages, 1 means silent mode. default: 0
whether to use external memory as cache.
whether to use external memory as cache. default: false