fix: remove deprecated tokenizer arg from Trainer.__init__

Author: walidsobhie-code

training/train_extended_context.py

@@ -310,7 +310,6 @@ def tokenize(example):
         train_dataset=train_ds,
         eval_dataset=val_ds,
         data_collator=data_collator,
-        tokenizer=tokenizer,
     )
 
     # ── 6. Train ──────────────────────────────────────────────────────