Fixed typing to have compatibility with OmegaConf 2.2.2 in Pytorch3D

Summary:
I tried to run `experiment.py` and `pytorch3d_implicitron_runner` and faced the failure with this traceback: https://www.internalfb.com/phabricator/paste/view/P515734086

It seems to be due to the new release of OmegaConf (version=2.2.2) which requires different typing. This fix helped to overcome it.

Reviewed By: bottler

Differential Revision: D37881644

fbshipit-source-id: be0cd4ced0526f8382cea5bdca9b340e93a2fba2

projects/implicitron_trainer/impl/experiment_config.py

@@ -5,7 +5,7 @@
 # LICENSE file in the root directory of this source tree.
 
 from dataclasses import field
-from typing import Tuple
+from typing import Any, Dict, Tuple
 
 from omegaconf import DictConfig
 from pytorch3d.implicitron.dataset.data_source import ImplicitronDataSource
@@ -41,7 +41,7 @@ class ExperimentConfig(Configurable):
     clip_grad: float = 0.0
     camera_difficulty_bin_breaks: Tuple[float, ...] = 0.97, 0.98
 
-    hydra: dict = field(
+    hydra: Dict[str, Any] = field(
         default_factory=lambda: {
             "run": {"dir": "."},  # Make hydra not change the working dir.
             "output_subdir": None,  # disable storing the .hydra logs

projects/implicitron_trainer/impl/optimization.py

@@ -25,7 +25,7 @@ def init_optimizer(
     gamma: float = 0.1,
     momentum: float = 0.9,
     betas: Tuple[float, ...] = (0.9, 0.999),
-    milestones: tuple = (),
+    milestones: Tuple[int, ...] = (),
     max_epochs: int = 1000,
 ):
     """