Datamanager eval fix (#1482)

* Fix datamanager

* Datamanager tweak

* Hopefully fixed now

* readd comment

nerfstudio/data/datamanagers/base_datamanager.py

@@ -402,9 +402,12 @@ class VanillaDataManager(DataManager):  # pylint: disable=abstract-method
         )
         self.iter_eval_image_dataloader = iter(self.eval_image_dataloader)
         self.eval_pixel_sampler = self._get_pixel_sampler(self.eval_dataset, self.config.eval_num_rays_per_batch)
+        self.eval_camera_optimizer = self.config.camera_optimizer.setup(
+            num_cameras=self.eval_dataset.cameras.size, device=self.device
+        )
         self.eval_ray_generator = RayGenerator(
             self.eval_dataset.cameras.to(self.device),
-            self.train_camera_optimizer,  # should be shared between train and eval.
+            self.eval_camera_optimizer,
         )
         # for loading full images
         self.fixed_indices_eval_dataloader = FixedIndicesEvalDataloader(