Fix GB calculation

src/leaderboard.py

@@ -40,8 +40,8 @@ def create_leaderboard(validator_uid) -> gr.Dataframe:
                 round(submission.score, 3),
                 f"{submission.metrics.generation_time:.3f}s",
                 f"{submission.average_similarity * 100:.3f}%",
-                f"{submission.metrics.size / 1_000_000_000:.3f}GB",
-                f"{submission.metrics.vram_used / 1_000_000_000:.3f}GB",
+                f"{submission.metrics.size / 1024 ** 3:.3f}GB",
+                f"{submission.metrics.vram_used / 1024 ** 3:.3f}GB",
                 f"{submission.metrics.watts_used:.3f}W",
                 f"{submission.metrics.load_time:.3f}s",
                 f"[{submission.info.block}](https://taostats.io/block/{submission.info.block})",