make it easier to do multiple fold training

trust_and_safety_models/toxicity/train.py

@@ -387,15 +387,16 @@ class Trainer(object):
         fold=i,
       )
     else:
-      raise ValueError("Sure you want to do multiple fold training")
-      for mb_generator, steps_per_epoch, val_data, test_data in self.mb_loader(full_df=df):
-        self._train_single_fold(
-          mb_generator=mb_generator,
-          val_data=val_data,
-          test_data=test_data,
-          steps_per_epoch=steps_per_epoch,
-          fold=i,
-        )
-        i += 1
-        if i == 3:
-          break
+      a = input("Are you sure you want to do multiple fold training? (y/n)")
+      if a.lower() == "y":
+        for mb_generator, steps_per_epoch, val_data, test_data in self.mb_loader(full_df=df):
+          self._train_single_fold(
+            mb_generator=mb_generator,
+            val_data=val_data,
+            test_data=test_data,
+            steps_per_epoch=steps_per_epoch,
+            fold=i,
+          )
+          i += 1
+          if i == 3:
+            break