Define request for pre processing the training data.

cml/shared/request.py

+from dataclasses import dataclass
+
+from cml.ports.source_adapters import Adapter
+from cml.shared.settings import PreprocessingSettings, BlockProcessingSettings
+
+
+@dataclass
+class PreprocessRequest:
+    source_adapter: Adapter
+    pre_settings: PreprocessingSettings
+    block_settings: BlockProcessingSettings