debug: add temporary log statements for dataset preview and VLM instruction

studio/backend/core/training/worker.py

@@ -227,6 +227,16 @@ def run_training_process(
             dataset = dataset_result
             eval_dataset = None
 
+        # [DEBUG] Print first sample before model is loaded
+        try:
+            sample = dataset[0] if len(dataset) > 0 else None
+            logger.info(f"[DEBUG] Dataset loaded BEFORE model. First sample keys: {list(sample.keys()) if sample else 'empty'}")
+            if sample:
+                preview = {k: str(v)[:200] for k, v in sample.items()}
+                logger.info(f"[DEBUG] First sample preview: {preview}")
+        except Exception as e:
+            logger.info(f"[DEBUG] Could not preview first sample: {e}")
+
         # Disable eval if eval_steps <= 0
         eval_steps = config.get("eval_steps", 0.00)
         if eval_steps is not None and float(eval_steps) <= 0:

studio/backend/utils/datasets/vlm_processing.py

@@ -200,6 +200,11 @@ def generate_smart_vlm_instruction(
             dataset_name=dataset_name,
         )
         if llm_result and llm_result.get("instruction"):
+            import logging
+            logging.getLogger(__name__).info(
+                f"[DEBUG] LLM-assisted VLM instruction generated: "
+                f"'{llm_result['instruction']}' (confidence={llm_result.get('confidence', 'N/A')})"
+            )
             return {
                 "instruction": llm_result["instruction"],
                 "instruction_column": None,