diff --git a/code_soup/ch5/models/gan.py b/code_soup/ch5/models/gan.py
index 71e62c0..d8236fb 100644
--- a/code_soup/ch5/models/gan.py
+++ b/code_soup/ch5/models/gan.py
@@ -169,6 +169,8 @@ def step(self, data: torch.Tensor) -> Tuple:
             Discriminator loss
          D_G_z2:
             Average discriminator outputs for the all fake batch after updating discriminator
+         errG:
+            Generator loss
         """
         real_image, _ = data
         real_image = real_image.to(self.device)
@@ -176,6 +178,7 @@ def step(self, data: torch.Tensor) -> Tuple:
         label = torch.full(
             (batch_size,), self.real_label, dtype=torch.float, device=self.device
         )
+        self.discriminator.zero_grad()
         # Forward pass real batch through D
         output = self.discriminator(real_image).view(-1)
         # Calculate loss on all-real batch
@@ -211,4 +214,4 @@ def step(self, data: torch.Tensor) -> Tuple:
         D_G_z2 = output.mean().item()
         # Update G
         self.generator.optimizer.step()
-        return D_x, D_G_z1, errD, D_G_z2
+        return D_x, D_G_z1, errD, D_G_z2, errG
diff --git a/code_soup/common/vision/perturbations.py b/code_soup/common/vision/perturbations.py
index c68bc3c..bdc85cf 100644
--- a/code_soup/common/vision/perturbations.py
+++ b/code_soup/common/vision/perturbations.py
@@ -3,13 +3,19 @@
 
 import numpy as np
 import torch
+import torch.nn as nn
+
+from math import log10
 
 from code_soup.common.perturbation import Perturbation
 
 
 class VisualPerturbation(Perturbation):
     """
-    Docstring for VisualPerturbations
+    An abstract method for various Visual Perturbation Metrics
+        Methods
+        __init__(self, original : Union[np.ndarray, torch.Tensor], perturbed: Union[np.ndarray, torch.Tensor])
+            - init method
     """
 
     def __init__(
@@ -21,16 +27,41 @@ def __init__(
         Docstring
         #Automatically cast to Tensor using the torch.from_numpy() in the __init__ using if
         """
-        raise NotImplementedError
 
-    def calculate_LPNorm(self, p: Union[int, str]):
-        raise NotImplementedError
+        if type(original) == torch.Tensor:
+            self.original = original
+        else:
+            self.original = torch.from_numpy(original)
+        print(self.original.shape)
 
-    def calculate_PSNR(self):
-        raise NotImplementedError
+        if type(perturbed) == torch.Tensor:
+            self.perturbed = perturbed
+        else:
+            self.perturbed = torch.from_numpy(perturbed)
 
-    def calculate_RMSE(self):
-        raise NotImplementedError
+    def flatten(self, array : torch.tensor) -> torch.Tensor:
+        return array.flatten()
+
+    def totensor(self, array : np.ndarray) -> torch.Tensor:
+        return torch.from_numpy(array)
+
+    def subtract(self,original : torch.Tensor, perturbed : torch.Tensor) -> torch.Tensor:
+        return torch.sub(original, perturbed)
+
+    def calculate_LPNorm(self, p: Union[int, str]) -> float:
+        if p == 'inf':
+            return torch.linalg.vector_norm(self.flatten(self.subtract(self.original,self.perturbed)), ord = float('inf')).item()
+        elif p == 'fro':
+            return self.calculate_LPNorm(2)
+        else:
+            return torch.linalg.norm(self.flatten(self.subtract(self.original,self.perturbed)), ord = p).item()
+
+    def calculate_PSNR(self) -> float:
+        return 20 * log10(1.0/self.calculate_RMSE())
+
+    def calculate_RMSE(self) -> float:
+        loss = nn.MSELoss()
+        return (loss(self.original, self.perturbed)**0.5).item()
 
     def calculate_SAM(self):
         raise NotImplementedError