Rakefile in ruby-dnn-0.9.4 vs Rakefile in ruby-dnn-0.10.0

@@ -15,5 +15,11 @@
 task :build_image_io do
   sh "cd ext/rb_stb_image; ruby extconf.rb; make"
 end
 
 task :default => [:test, :build_dataset_loader, :build_image_io]
+
+task :doc do
+  src_list = Dir["lib/dnn/core/*.rb"]
+  src_list += Dir["lib/dnn/*.rb"]
+  sh "yardoc #{src_list.join(' ')}"
+end