From bd66d056c8404915d21b5214e27ea1b2ffdd2892 Mon Sep 17 00:00:00 2001
From: typhoonzero <typhoonzero1986@gmail.com>
Date: Fri, 8 Sep 2017 15:09:45 +0800
Subject: [PATCH] fix row buffer mem free

---
 paddle/math/RowBuffer.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/paddle/math/RowBuffer.h b/paddle/math/RowBuffer.h
index dbb829c4e..9ef5b8968 100644
--- a/paddle/math/RowBuffer.h
+++ b/paddle/math/RowBuffer.h
@@ -99,7 +99,11 @@ public:
   /**
    * @brief clear local buffer. It only affect auto-growth buffer.
    */
-  inline void clear() { rowStore_.clear(); }
+  inline void clear() {
+    // swap an empty vector to it to free the memory.
+    std::vector<real, AlignedAllocator<real, 32>> empty;
+    rowStore_.swap(empty);
+  }
 
   /**
    * @brief get current number of rows.
-- 
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