[Fix] dataloader issue, distill for single gpu ready

Author: Eigensystem

fastvideo/v1/dataset/parquet_datasets.py

@@ -119,6 +119,7 @@ def __init__(self,
                 plan = json.load(f)
             self.neg_metadata = plan["negative_prompt"][0]
 
+        # Add unconditional embeddings for distillation (like in LatentDataset)
         self.uncond_prompt_embed = torch.zeros(512, 4096).to(torch.float32)
         self.uncond_prompt_mask = torch.zeros(1, 512).bool()