Set better default LR across un/supervised

Author: C-Achard

napari_cellseg3d/code_plugins/plugin_model_training.py

@@ -443,11 +443,15 @@ def _toggle_unsupervised_mode(self, enabled=False):
             self.start_btn = self.start_button_unsupervised
             self.image_filewidget.text_field.setText("Validation images")
             self.labels_filewidget.text_field.setText("Validation labels")
+            self.learning_rate_choice.lr_value_choice.setValue(1)
+            self.learning_rate_choice.lr_exponent_choice.setCurrentIndex(1)
         else:
             unsupervised = False
             self.start_btn = self.start_button_supervised
             self.image_filewidget.text_field.setText("Images directory")
             self.labels_filewidget.text_field.setText("Labels directory")
+            self.learning_rate_choice.lr_value_choice.setValue(2)
+            self.learning_rate_choice.lr_exponent_choice.setCurrentIndex(3)
 
         supervised = not unsupervised
         self.unsupervised_mode = unsupervised