class optuna.integration.MXNetPruningCallback(trial, eval_metric)[source]

MXNet callback to prune unpromising trials.

See the example if you want to add a pruning callback which observes accuracy.

  • trial (Trial) – A Trial corresponding to the current evaluation of the objective function.

  • eval_metric (str) – An evaluation metric name for pruning, e.g., cross-entropy and accuracy. If using default metrics like mxnet.metrics.Accuracy, use it’s default metric name. For custom metrics, use the metric_name provided to constructor. Please refer to mxnet.metrics reference for further details.