Bala93
diff --git a/‎monai/losses/segcalib.py‎
Lines changed: 65 additions & 11 deletions b/‎monai/losses/segcalib.py‎
Lines changed: 65 additions & 11 deletions
@@ -12,6 +12,7 @@
 from __future__ import annotations
 
 import math
+import warnings
 
 import torch
 import torch.nn as nn
@@ -21,6 +22,16 @@
 from monai.utils import pytorch_after
 
 
+def get_mean_kernel_2d(ksize: int = 3) -> torch.Tensor:
+    mean_kernel = torch.ones([ksize, ksize]) / (ksize**2)
+    return mean_kernel
+
+
+def get_mean_kernel_3d(ksize: int = 3) -> torch.Tensor:
+    mean_kernel = torch.ones([ksize, ksize, ksize]) / (ksize**3)
+    return mean_kernel
+
+
 def get_gaussian_kernel_2d(ksize: int = 3, sigma: float = 1.0) -> torch.Tensor:
     x_grid = torch.arange(ksize).repeat(ksize).view(ksize, ksize)
     y_grid = x_grid.t()
@@ -101,6 +112,50 @@ def forward(self, x):
         return self.svls_layer(x) / self.svls_kernel.sum()
 
 
+class MeanFilter(torch.nn.Module):
+    def __init__(self, dim: int = 3, ksize: int = 3, channels: int = 0) -> torch.Tensor:
+        super(MeanFilter, self).__init__()
+
+        if dim == 2:
+            self.svls_kernel = get_mean_kernel_2d(ksize=ksize)
+            svls_kernel_2d = self.svls_kernel.view(1, 1, ksize, ksize)
+            svls_kernel_2d = svls_kernel_2d.repeat(channels, 1, 1, 1)
+            padding = int(ksize / 2)
+
+            self.svls_layer = torch.nn.Conv2d(
+                in_channels=channels,
+                out_channels=channels,
+                kernel_size=ksize,
+                groups=channels,
+                bias=False,
+                padding=padding,
+                padding_mode="replicate",
+            )
+            self.svls_layer.weight.data = svls_kernel_2d
+            self.svls_layer.weight.requires_grad = False
+
+        if dim == 3:
+            self.svls_kernel = get_mean_kernel_3d(ksize=ksize)
+            svls_kernel_3d = self.svls_kernel.view(1, 1, ksize, ksize)
+            svls_kernel_3d = svls_kernel_3d.repeat(channels, 1, 1, 1)
+            padding = int(ksize / 2)
+
+            self.svls_layer = torch.nn.Conv3d(
+                in_channels=channels,
+                out_channels=channels,
+                kernel_size=ksize,
+                groups=channels,
+                bias=False,
+                padding=padding,
+                padding_mode="replicate",
+            )
+            self.svls_layer.weight.data = svls_kernel_3d
+            self.svls_layer.weight.requires_grad = False
+
+    def forward(self, x):
+        return self.svls_layer(x) / self.svls_kernel.sum()
+
+
 class NACLLoss(_Loss):
     """
     Neighbor-Aware Calibration Loss (NACL) is primarily developed for developing calibrated models in image segmentation.
@@ -118,6 +173,7 @@ def __init__(
         classes: int,
         dim: int,
         kernel_size: int = 3,
+        kernel_ops: str = "mean",
         distance_type: str = "l1",
         alpha: float = 0.1,
         sigma: float = 1.0,
@@ -133,6 +189,9 @@ def __init__(
 
         super().__init__()
 
+        if kernel_ops not in ["mean", "gaussian"]:
+            raise ValueError("Kernel ops must be either mean or gaussian")
+
         if dim not in [2, 3]:
             raise ValueError("Supoorts 2d and 3d")
 
@@ -146,7 +205,10 @@ def __init__(
         self.alpha = alpha
         self.ks = kernel_size
 
-        self.svls_layer = GaussianFilter(dim=dim, ksize=kernel_size, sigma=sigma, channels=classes)
+        if kernel_ops == "mean":
+            self.svls_layer = MeanFilter(dim=dim, ksize=kernel_size, channels=classes)
+        if kernel_ops == "gaussian":
+            self.svls_layer = GaussianFilter(dim=dim, ksize=kernel_size, sigma=sigma, channels=classes)
 
         self.old_pt_ver = not pytorch_after(1, 10)
 
@@ -173,24 +235,16 @@ def __init__(
     #     return self.cross_entropy(input, target)  # type: ignore[no-any-return]
 
     def get_constr_target(self, mask: torch.Tensor) -> torch.Tensor:
-
         if self.dim == 2:
-
-            oh_labels = (
-                F.one_hot(mask.to(torch.int64), num_classes=self.nc).contiguous().permute(0, 3, 1, 2).float()
-            )
+            oh_labels = F.one_hot(mask.to(torch.int64), num_classes=self.nc).contiguous().permute(0, 3, 1, 2).float()
             rmask = self.svls_layer(oh_labels)
 
         if self.dim == 3:
-
-            oh_labels = (
-                F.one_hot(mask.to(torch.int64), num_classes=self.nc).contiguous().permute(0, 4, 1, 2, 3).float()
-            )
+            oh_labels = F.one_hot(mask.to(torch.int64), num_classes=self.nc).contiguous().permute(0, 4, 1, 2, 3).float()
             rmask = self.svls_layer(oh_labels)
 
         return rmask
 
-
     def forward(self, inputs: torch.Tensor, targets: torch.Tensor) -> torch.Tensor:
         loss_ce = self.cross_entropy(inputs, targets)