Trainer - deprecate tokenizer for processing_class (#32385)

* Trainer - deprecate tokenizer for processing_class

* Extend chage across Seq2Seq trainer and docs

* Add tests

* Update to FutureWarning and add deprecation version

examples/pytorch/text-classification/run_classification.py

@@ -674,7 +674,7 @@ def main():
         train_dataset=train_dataset if training_args.do_train else None,
         eval_dataset=eval_dataset if training_args.do_eval else None,
         compute_metrics=compute_metrics,
-        tokenizer=tokenizer,
+        processing_class=tokenizer,
         data_collator=data_collator,
     )
 

examples/pytorch/text-classification/run_glue.py

@@ -531,7 +531,7 @@ def main():
         train_dataset=train_dataset if training_args.do_train else None,
         eval_dataset=eval_dataset if training_args.do_eval else None,
         compute_metrics=compute_metrics,
-        tokenizer=tokenizer,
+        processing_class=tokenizer,
         data_collator=data_collator,
     )
 

examples/pytorch/text-classification/run_xnli.py

@@ -393,7 +393,7 @@ def main():
         train_dataset=train_dataset if training_args.do_train else None,
         eval_dataset=eval_dataset if training_args.do_eval else None,
         compute_metrics=compute_metrics,
-        tokenizer=tokenizer,
+        processing_class=tokenizer,
         data_collator=data_collator,
     )