Fix VLM detection error: match official Unsloth notebook config

vlm-streaming-sft-unsloth-qwen.py

@@ -3,10 +3,10 @@
 # dependencies = [
 #     "unsloth",
 #     "datasets",
-#     "trl>=0.16",
+#     "trl==0.22.2",
 #     "huggingface_hub[hf_transfer]",
 #     "trackio",
-#     "transformers>=4.51",
+#     "transformers==4.57.1",
 # ]
 # ///
 """
@@ -147,8 +147,8 @@ Examples:
     parser.add_argument(
         "--lora-alpha",
         type=int,
-        default=32,
-        help="LoRA alpha (default: 32). Usually 2*r",
+        default=16,
+        help="LoRA alpha (default: 16). Same as r per Unsloth notebook",
     )
 
     # Logging
@@ -273,17 +273,13 @@ def main():
         output_dir=args.save_local,
         per_device_train_batch_size=args.batch_size,
         gradient_accumulation_steps=args.gradient_accumulation,
-        gradient_checkpointing=True,
-        gradient_checkpointing_kwargs={"use_reentrant": False},
-        max_grad_norm=0.3,
-        warmup_ratio=0.03,
+        warmup_steps=5,  # Per notebook (not warmup_ratio)
         max_steps=args.max_steps,
         learning_rate=args.learning_rate,
         logging_steps=max(1, args.max_steps // 20),
-        save_strategy="steps",
-        optim="adamw_torch_fused",
+        optim="adamw_8bit",  # Per notebook
         weight_decay=0.001,
-        lr_scheduler_type="cosine",
+        lr_scheduler_type="linear",  # Per notebook (not cosine)
         seed=3407,
         # VLM-specific settings (required for Unsloth)
         remove_unused_columns=False,