Revert an unused change in Sequences.h

Common/Include/Sequences.h

@@ -235,26 +235,6 @@ namespace Microsoft { namespace MSR { namespace CNTK {
             return false;
         }
 
-		bool DecimateSequencesNotSelected(const vector<size_t> & selectedseq)
-		{
-			size_t maxseqid = *std::max_element(selectedseq.begin(), selectedseq.end()); 
-			if (maxseqid > m_numParallelSequences)
-			{
-				RuntimeError("DecimateSequencesNotSelected: there are %d parallel sequences, while you are asking for the %d-th sequence\n", m_numParallelSequences, maxseqid); 
-			}
-
-			Matrix<float> newBoundaryFlags(selectedseq.size(), m_numTimeSteps, CPUDEVICE); 
-			for (size_t i = 0; i < selectedseq.size(); i++)
-			{
-				for (size_t j = 0; j < m_numTimeSteps; j++)
-				{
-					newBoundaryFlags(i, j) = m_sentenceBoundaryFlags(selectedseq[i], j); 
-				}
-			}			
-			m_sentenceBoundaryFlags = newBoundaryFlags; 
-			m_numParallelSequences = selectedseq.size();
-			return true; 
-		}
     private:
         size_t m_numTimeSteps;
         size_t m_numParallelSequences;