Make lightning reproducible

Summary:
X-link: facebookresearch/d2go#661

X-link: fairinternal/detectron2#603

Pull Request resolved: #5273

In this diff we make changes to ensure we can control reproducibility in d2go:

- update setup.py to enforce deterministic performance if set via config
- set lightning parameters if deterministic is passed:

```
 {
                "sync_batchnorm": True,
                "deterministic": True,
                "replace_sampler_ddp": False,
 }
```
- allow passing prefetch_factor, pin_memory, persistent_memory as args to batch dataloader.
- minor fix in training sampler

Differential Revision: D55767128

fbshipit-source-id: eeab50c95969a91c58f1773473b6fc666494cc16

detectron2/data/build.py

@@ -301,6 +301,9 @@ def build_batch_data_loader(
     collate_fn=None,
     drop_last: bool = True,
     single_gpu_batch_size=None,
+    prefetch_factor=2,
+    persistent_workers=False,
+    pin_memory=False,
     seed=None,
     **kwargs,
 ):
@@ -375,8 +378,11 @@ def build_batch_data_loader(
             num_workers=num_workers,
             collate_fn=trivial_batch_collator if collate_fn is None else collate_fn,
             worker_init_fn=worker_init_reset_seed,
+            prefetch_factor=prefetch_factor if num_workers > 0 else None,
+            persistent_workers=persistent_workers,
+            pin_memory=pin_memory,
             generator=generator,
-            **kwargs
+            **kwargs,
         )
 
 

detectron2/data/samplers/distributed_sampler.py

@@ -61,7 +61,8 @@ def __iter__(self):
 
     def _infinite_indices(self):
         g = torch.Generator()
-        g.manual_seed(self._seed)
+        if self._seed is not None:
+            g.manual_seed(self._seed)
         while True:
             if self._shuffle:
                 yield from torch.randperm(self._size, generator=g).tolist()

detectron2/utils/env.py

@@ -42,6 +42,7 @@ def seed_all_rng(seed=None):
     np.random.seed(seed)
     torch.manual_seed(seed)
     random.seed(seed)
+    torch.cuda.manual_seed_all(str(seed))
     os.environ["PYTHONHASHSEED"] = str(seed)