clean backend

visualdl/utils/concurrency.h

-#ifndef VISUALDL_BACKEND_UTILS_CONCURRENCY_H
-#define VISUALDL_BACKEND_UTILS_CONCURRENCY_H
+#ifndef VISUALDL_UTILS_CONCURRENCY_H
+#define VISUALDL_UTILS_CONCURRENCY_H
 
 #include <glog/logging.h>
 #include <chrono>

visualdl/utils/filesystem.h

-#ifndef VISUALDL_BACKEND_UTILS_FILESYSTEM_H
-#define VISUALDL_BACKEND_UTILS_FILESYSTEM_H
+#ifndef VISUALDL_UTILS_FILESYSTEM_H
+#define VISUALDL_UTILS_FILESYSTEM_H
 
 #include <google/protobuf/text_format.h>
 #include <sys/stat.h>

visualdl/utils/log.h

-#ifndef VISUALDL_BACKEND_UTILS_LOG_H
-#define VISUALDL_BACKEND_UTILS_LOG_H
+#ifndef VISUALDL_UTILS_LOG_H
+#define VISUALDL_UTILS_LOG_H
 
 #include <stdexcept>
+
 namespace visualdl {
 
 namespace log {

visualdl/utils/test_concurrency.cc

-#include "visualdl/backend/utils/concurrency.h"
+#include "visualdl/utils/concurrency.h"
 
 #include <glog/logging.h>
 #include <gtest/gtest.h>
@@ -16,4 +16,4 @@ TEST(concurrency, test) {
   cc::PeriodExector::Global()(std::move(task), 200);
 }
 
-}  // namespace visualdl
\ No newline at end of file
+}  // namespace visualdl