Added LeakyRELU Class for Exam

LeakyRELU.py

+import torch
+
+class LeakyRELU:
+
+    def __init__(self):
+        self.x = 0
+
+    def forward(self,x):
+        self.x = x
+        if x >= 0:
+            y = x
+        elif x <= 0:
+            y = 0.1*x
+        return y
+
+    def backwards(self,dz):
+        if self.x >= 0:
+            f = 1
+        elif self.x < 0:
+            f = 0.1
+        return f*dz
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