From 377401fb0cc7947d09b007a2c52cb679905cf2b5 Mon Sep 17 00:00:00 2001
From: caoying03 <caoying03@baidu.com>
Date: Wed, 23 Aug 2017 14:13:51 +0800
Subject: [PATCH] fix a bug.

---
 paddle/gserver/layers/SequenceSliceLayer.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/paddle/gserver/layers/SequenceSliceLayer.cpp b/paddle/gserver/layers/SequenceSliceLayer.cpp
index 4da65ade0b4..5d72d373047 100644
--- a/paddle/gserver/layers/SequenceSliceLayer.cpp
+++ b/paddle/gserver/layers/SequenceSliceLayer.cpp
@@ -127,7 +127,8 @@ void SequenceSliceLayer::copySliceIdsToCpu() {
 
 void SequenceSliceLayer::calSelectedRows(const MatrixPtr starts,
                                          const MatrixPtr ends) {
-  CHECK(starts && ends);
+  CHECK(starts || ends) << "At least one of the start or end indices "
+                        << "should be given.";
 
   outSeqStartPos_.resize(1, 0);
   outSubSeqStartPos_.resize(1, 0);
@@ -148,7 +149,7 @@ void SequenceSliceLayer::calSelectedRows(const MatrixPtr starts,
         if (ends) endPos = inputSeqInfoVec_[i][j] + ends->getElement(rowIdx, k);
 
         int seqLen = endPos - begPos + 1;
-        CHECK_LT(seqLen, 0U);
+        CHECK_GT(seqLen, 0U);
         for (int m = begPos; m <= endPos; ++m) selectedRows_.push_back(m);
         inputSeqInfoVec_.size() > 1
             ? outSubSeqStartPos_.push_back(outSubSeqStartPos_.back() + seqLen)
-- 
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