From 37b5475261ad0d5f70248e3a06741c0d9e82a181 Mon Sep 17 00:00:00 2001
From: Samanvya Tripathi <tripathisamanvya@gmail.com>
Date: Wed, 25 Mar 2026 20:37:03 -0400
Subject: [PATCH] fix(sft): use processing_class instead of deprecated
 tokenizer param

SFTTrainer was using the deprecated `tokenizer` parameter while
DPOTrainer and GRPOTrainer already use `processing_class`. This
caused deprecation warnings in notebooks and inconsistent API usage.

Fixes #15
---
 src/alignrl/sft.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/alignrl/sft.py b/src/alignrl/sft.py
index 08b9965..8e1f003 100644
--- a/src/alignrl/sft.py
+++ b/src/alignrl/sft.py
@@ -104,7 +104,7 @@ def train(self) -> TrainResult:
 
         trainer = SFTTrainer(
             model=self._model,
-            tokenizer=self._tokenizer,
+            processing_class=self._tokenizer,
             train_dataset=dataset,
             args=training_args,
         )