Rakefile in ruby-dnn-0.13.2 vs Rakefile in ruby-dnn-0.13.3

@@ -6,18 +6,26 @@
   t.libs << "ext"
   t.libs << "lib"
   t.test_files = FileList["test/*_test.rb"]
 end
 
-task :build_dataset_loader do
+task :build_cifar_loader do
   sh "cd ext/cifar_loader; ruby extconf.rb; make"
 end
 
-task :build_image_io do
+task :build_rb_stb_image do
   sh "cd ext/rb_stb_image; ruby extconf.rb; make"
 end
 
-task :default => [:test, :build_dataset_loader, :build_image_io]
+task :clean_cifar_loader do
+  sh "cd ext/cifar_loader; make clean; unlink Makefile"
+end
+
+task :clean_rb_stb_image do
+  sh "cd ext/rb_stb_image; make clean; unlink Makefile"
+end
+
+task :default => [:test, :build_cifar_loader, :build_rb_stb_image]
 
 task :doc do
   src_list = Dir["lib/dnn/core/*.rb"]
   src_list += Dir["lib/dnn/*.rb"]
   sh "yardoc #{src_list.join(' ')}"