lib/dnn/core/utils.rb in ruby-dnn-0.15.0 vs lib/dnn/core/utils.rb in ruby-dnn-0.15.1

@@ -28,7 +28,12 @@
 
     # Return the result of the softmax function.
     def self.softmax(x)
       Losses::SoftmaxCrossEntropy.softmax(x)
     end
+
+    # Perform numerical differentiation.
+    def self.numerical_grad(x, func)
+      (func.(x + 1e-7) - func.(x)) / 1e-7
+    end
   end
 end