diff --git a/nerfstudio/data/datamanagers/base_datamanager.py b/nerfstudio/data/datamanagers/base_datamanager.py
index 6933dd475..b4b6115d5 100644
--- a/nerfstudio/data/datamanagers/base_datamanager.py
+++ b/nerfstudio/data/datamanagers/base_datamanager.py
@@ -452,13 +452,13 @@ class VanillaDataManager(DataManager, Generic[TDataset]):
             scale_factor=self.config.camera_res_scale_factor,
         )
 
-    def _get_pixel_sampler(self, dataset: TDataset, *args: Any, **kwargs: Any) -> PixelSampler:
+    def _get_pixel_sampler(self, dataset: TDataset, num_rays_per_batch: int) -> PixelSampler:
         """Infer pixel sampler to use."""
         is_equirectangular = (dataset.cameras.camera_type == CameraType.EQUIRECTANGULAR.value).all()
         if is_equirectangular.any():
             CONSOLE.print("[bold yellow]Warning: Some cameras are equirectangular, but using default pixel sampler.")
         return self.config.pixel_sampler.setup(
-            is_equirectangular=is_equirectangular, num_rays_per_batch=self.config.train_num_rays_per_batch
+            is_equirectangular=is_equirectangular, num_rays_per_batch=num_rays_per_batch
         )
 
     def setup_train(self):
diff --git a/nerfstudio/data/pixel_samplers.py b/nerfstudio/data/pixel_samplers.py
index e89d287b9..e8f473e21 100644
--- a/nerfstudio/data/pixel_samplers.py
+++ b/nerfstudio/data/pixel_samplers.py
@@ -61,8 +61,7 @@ class PixelSampler:
     def __init__(self, config: PixelSamplerConfig, **kwargs) -> None:
         self.kwargs = kwargs
         self.config = config
-        self.num_rays_per_batch = self.config.num_rays_per_batch
-        self.keep_full_image = self.config.keep_full_image
+        self.set_num_rays_per_batch(self.config.num_rays_per_batch)
 
     def set_num_rays_per_batch(self, num_rays_per_batch: int):
         """Set the number of rays to sample per batch.
@@ -264,11 +263,11 @@ class PixelSampler:
         if isinstance(image_batch["image"], list):
             image_batch = dict(image_batch.items())  # copy the dictionary so we don't modify the original
             pixel_batch = self.collate_image_dataset_batch_list(
-                image_batch, self.num_rays_per_batch, keep_full_image=self.keep_full_image
+                image_batch, self.num_rays_per_batch, keep_full_image=self.config.keep_full_image
             )
         elif isinstance(image_batch["image"], torch.Tensor):
             pixel_batch = self.collate_image_dataset_batch(
-                image_batch, self.num_rays_per_batch, keep_full_image=self.keep_full_image
+                image_batch, self.num_rays_per_batch, keep_full_image=self.config.keep_full_image
             )
         else:
             raise ValueError("image_batch['image'] must be a list or torch.Tensor")
@@ -294,13 +293,7 @@ class PatchPixelSampler(PixelSampler):
         config: the PatchPixelSamplerConfig used to instantiate class
     """
 
-    def __init__(self, config: PatchPixelSamplerConfig, **kwargs) -> None:
-        self.config = config
-        self.patch_size = self.config.patch_size
-        self.config.num_rays_per_batch = (self.config.num_rays_per_batch // (self.patch_size**2)) * (
-            self.patch_size**2
-        )
-        super().__init__(self.config, **kwargs)
+    config: PatchPixelSamplerConfig
 
     def set_num_rays_per_batch(self, num_rays_per_batch: int):
         """Set the number of rays to sample per batch. Overridden to deal with patch-based sampling.
@@ -308,7 +301,7 @@ class PatchPixelSampler(PixelSampler):
         Args:
             num_rays_per_batch: number of rays to sample per batch
         """
-        self.num_rays_per_batch = (num_rays_per_batch // (self.patch_size**2)) * (self.patch_size**2)
+        self.num_rays_per_batch = (num_rays_per_batch // (self.config.patch_size**2)) * (self.config.patch_size**2)
 
     # overrides base method
     def sample_method(
@@ -324,16 +317,20 @@ class PatchPixelSampler(PixelSampler):
             # Note: if there is a mask, sampling reduces back to uniform sampling
             indices = super().sample_method(batch_size, num_images, image_height, image_width, mask=mask, device=device)
         else:
-            sub_bs = batch_size // (self.patch_size**2)
+            sub_bs = batch_size // (self.config.patch_size**2)
             indices = torch.rand((sub_bs, 3), device=device) * torch.tensor(
-                [num_images, image_height - self.patch_size, image_width - self.patch_size],
+                [num_images, image_height - self.config.patch_size, image_width - self.config.patch_size],
                 device=device,
             )
 
-            indices = indices.view(sub_bs, 1, 1, 3).broadcast_to(sub_bs, self.patch_size, self.patch_size, 3).clone()
+            indices = (
+                indices.view(sub_bs, 1, 1, 3)
+                .broadcast_to(sub_bs, self.config.patch_size, self.config.patch_size, 3)
+                .clone()
+            )
 
             yys, xxs = torch.meshgrid(
-                torch.arange(self.patch_size, device=device), torch.arange(self.patch_size, device=device)
+                torch.arange(self.config.patch_size, device=device), torch.arange(self.config.patch_size, device=device)
             )
             indices[:, ..., 1] += yys
             indices[:, ..., 2] += xxs
diff --git a/pyproject.toml b/pyproject.toml
index 61e04bc1e..6e730bd49 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -138,7 +138,7 @@ include = ["nerfstudio*"]
 line-length = 120
 
 [tool.pytest.ini_options]
-addopts = "-n=4 --typeguard-packages=nerfstudio --disable-warnings"
+addopts = "--typeguard-packages=nerfstudio --disable-warnings"
 testpaths = [
     "tests",
 ]