lib/dnn/core/optimizers.rb in ruby-dnn-0.8.0 vs lib/dnn/core/optimizers.rb in ruby-dnn-0.8.1

@@ -9,10 +9,12 @@
         @learning_rate = learning_rate
       end
 
       # Update params.
       # Classes that inherit from this class must implement this method.
-      # def update(params) end
+      def update(params)
+        raise NotImplementedError.new("Class '#{self.class.name}' has implement method 'update'")
+      end
 
       def to_hash(merge_hash = nil)
         hash = {class: self.class.name, learning_rate: @learning_rate}
         hash.merge!(merge_hash) if merge_hash
         hash