Deprecate #normalized

Author: jecisc

src/DataFrame/DataFrame.class.st

@@ -1360,11 +1360,11 @@ DataFrame >> normalized [
 	"This methods returns a new DataFrame, without altering this one, that has all the columns normalized."
 
 	| normalizers normalizedColumns |
-	normalizers := (1 to: self anyOne size) collect: [ :e |  self class defaultNormalizerClass new ].
+	self deprecated:
+		'DataFrame will remove the dependency over normalization in the next version. You can use pharo-ai/data-preprocessing project to normalize your DataFrame and even more!'.
+	normalizers := (1 to: self anyOne size) collect: [ :e | self class defaultNormalizerClass new ].
 
-	normalizedColumns := self columns
-		with: normalizers
-		collect: [ :col :normalizer | col normalizedUsing: normalizer ].
+	normalizedColumns := self columns with: normalizers collect: [ :col :normalizer | col normalizedUsing: normalizer ].
 
 	^ self class withColumns: normalizedColumns columnNames: self columnNames
 ]