Deterministic D2GO Trainer Params

Summary:
Pull Request resolved: https://github.com/facebookresearch/d2go/pull/677

Previously, cfg.SOLVER.DETERMINISTIC was not taken into account for lightning `Trainer` in d2go:
- Nested checks `hasattr(cfg, "SOLVER.DETERMINISTIC")` do not work as expected
- If SOLVER.DETERMINISTIC exists, we should check that it is set to `True`

Reviewed By: ayushidalmia, rbasch

Differential Revision: D63426319

fbshipit-source-id: 8caf0af53e7b97a49392df09153e26ee3628231f

tools/lightning_train_net.py

@@ -108,7 +108,11 @@ def get_trainer_params(cfg: CfgNode) -> Dict[str, Any]:
             }
         )
 
-    if hasattr(cfg, "SOLVER.DETERMINISTIC"):
+    if (
+        hasattr(cfg, "SOLVER.DETERMINISTIC")
+        and hasattr(cfg.SOLVER, "DETERMINISTIC")
+        and cfg.SOLVER.DETERMINISTIC
+    ):
         params.update(
             {
                 "sync_batchnorm": True,