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diff --git a/tensorflow/core/util/util.h b/tensorflow/core/util/util.h
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+#ifndef TENSORFLOW_UTIL_UTIL_H_
+#define TENSORFLOW_UTIL_UTIL_H_
+
+#include "tensorflow/core/lib/core/stringpiece.h"
+
+namespace tensorflow {
+
+// If op_name has '/' in it, then return everything before the first '/'.
+// Otherwise return empty string.
+StringPiece NodeNamePrefix(const StringPiece& op_name);
+
+// If op_name has '/' in it, then return everything before the last '/'.
+// Otherwise return empty string.
+StringPiece NodeNameFullPrefix(const StringPiece& op_name);
+
+class MovingAverage {
+ public:
+  explicit MovingAverage(int window);
+  ~MovingAverage();
+
+  void Clear();
+
+  double GetAverage() const;
+  void AddValue(double v);
+
+ private:
+  const int window_;  // Max size of interval
+  double sum_;        // Sum over interval
+  double* data_;      // Actual data values
+  int head_;          // Offset of the newest statistic in data_
+  int count_;         // # of valid data elements in window
+};
+
+// Returns a string printing bytes in ptr[0..n).  The output looks
+// like "00 01 ef cd cd ef".
+string PrintMemory(const char* ptr, int n);
+
+}  // namespace tensorflow
+
+#endif  // TENSORFLOW_UTIL_UTIL_H_