Start export implementation (#110)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

ultralytics/yolo/v8/classify/train.py

@@ -4,7 +4,8 @@ import torch
 from ultralytics.nn.tasks import ClassificationModel, get_model
 from ultralytics.yolo import v8
 from ultralytics.yolo.data import build_classification_dataloader
-from ultralytics.yolo.engine.trainer import DEFAULT_CONFIG, BaseTrainer
+from ultralytics.yolo.engine.trainer import BaseTrainer
+from ultralytics.yolo.utils import DEFAULT_CONFIG
 
 
 class ClassificationTrainer(BaseTrainer):