Pass cfg.SEED to dataloader building

Summary: As title, so that dataloading is deterministic when `cfg.SEED` is set.

Differential Revision: D53547772

d2go/data/build.py

@@ -159,14 +159,15 @@ def build_weighted_detection_train_loader(
             )
         )
 
-    sampler = RepeatFactorTrainingSampler(repeat_factors)
+    sampler = RepeatFactorTrainingSampler(repeat_factors, seed=cfg.SEED)
 
     return build_batch_data_loader(
         dataset,
         sampler,
         cfg.SOLVER.IMS_PER_BATCH,
         aspect_ratio_grouping=cfg.DATALOADER.ASPECT_RATIO_GROUPING,
         num_workers=cfg.DATALOADER.NUM_WORKERS,
+        seed=cfg.SEED,
     )