correct the comment

source/tensor/core/movement/CopyIndexed.cpp

@@ -39,8 +39,8 @@ copy indexed sub-tensors
 >> indexSize - length of srcIndex (and tgtIndex)
 >> tgtIndex - index of the target sub-tensors
 >> copyNum - number of the sub-tensors we copy for each source index, 
-             e.g., for srcIndex = [1,4] and copyNum = 2,
-             we actually copy the source sub-tensors 1, 2, 4, 5
+             e.g., for srcIndex = [0,1] and copyNum = 2,
+             we actually copy the source sub-tensors 0, 1, 1 and 2
 */
 void _CopyIndexed(const XTensor * s, XTensor * t, int dim, 
                   int * srcIndex, int indexSize, int * tgtIndex, 
@@ -113,8 +113,8 @@ copy selected sub-tensors where indeces are kept in tensors
 >> srcIndex - the tensor to save the index of the source sub-tensors
 >> tgtIndex - the tensor to save the index of the target sub-tensors
 >> copyNum - number of the sub-tensors we copy for each source index, 
-             e.g., for srcIndex = [1,4] and copyNum = 2,
-             we actually copy the source sub-tensors 1, 2, 4, 5
+             e.g., for srcIndex = [0,1] and copyNum = 2,
+             we actually copy the source sub-tensors 0, 1, 1 and 2
 */
 void _CopyIndexed(const XTensor * s, XTensor * t, int dim, 
                   const XTensor * srcIndex, const XTensor * tgtIndex, 
@@ -199,8 +199,8 @@ make a new tensor to keep the result and return it
 >> indexSize - length of srcIndex (and tgtIndex)
 >> tgtIndex - index of the target sub-tensors
 >> copyNum - number of the sub-tensors we copy for each source index, 
-   e.g., for srcIndex = [1,4] and copyNum = 2,
-   we actually copy the source sub-tensors 1, 2, 4, 5
+             e.g., for srcIndex = [0,1] and copyNum = 2,
+             we actually copy the source sub-tensors 0, 1, 1 and 2
 << return - the result of copying indexed sub-tensors
 */
 XTensor CopyIndexed(const XTensor & s, int dim, 
@@ -255,8 +255,8 @@ make a new tensor to keep the result and return it
 >> indexSize - length of srcIndex (and tgtIndex)
 >> tgtIndex - index of the target sub-tensors
 >> copyNum - number of the sub-tensors we copy for each source index, 
-   e.g., for srcIndex = [1,4] and copyNum = 2,
-   we actually copy the source sub-tensors 1, 2, 4, 5
+             e.g., for srcIndex = [0,1] and copyNum = 2,
+             we actually copy the source sub-tensors 0, 1, 1 and 2
 << return - the result of copying indexed sub-tensors
 */
 XTensor CopyIndexed(const XTensor &s, int dim, int * srcIndex, int indexSize, int * tgtIndex, int copyNum)