more methods of accessing tensor entries and creating tensors

source/tensor/XTensor.cpp

@@ -1020,12 +1020,29 @@ get the value of a cell with the index
 */
 DTYPE XTensor::Get(int index[], int size)
 {
-    CheckNTErrors((dataType == DEFAULT_DTYPE), "The tensor is not in default type.");
+    CheckNTErrors(dataType == DEFAULT_DTYPE, "The tensor is not in the default type.");
 
     return ToCPU(devID, GetCell(index, size));
 }
     
 /*
+get the value of a cell with the offset
+>> offset - offset in the array
+<< return - cell value
+*/
+DTYPE XTensor::Get(int offset)
+{
+    CheckNTErrors(dataType == DEFAULT_DTYPE, "The tensor is not in the default type.");
+    CheckNTErrors(offset >= 0 && offset < unitNum, "Invalid index!");
+    CheckNTErrors(data != NULL, "Cannot use an uninitialized tensor!");
+    CheckNTErrors(denseRatio == 1.0F, "Only dense tensors are supported in Get(offset).");
+    
+    DTYPE * address = (DTYPE*)data + offset;
+    
+    return ToCPU(devID, address);
+}
+
+/* 
 get the pointer to a cell
 >> index - index of each dimension
 >> size - size of index
@@ -1122,12 +1139,14 @@ get the int value of a cell by its offset
 */
 int XTensor::GetInt(int offset)
 {
+    CheckNTErrors(dataType == X_INT, "The tensor is not in the integer type.");
     CheckNTErrors(offset >= 0 && offset < unitNum, "Invalid index!");
     CheckNTErrors(data != NULL, "Cannot use an uninitialized tensor!");
+    CheckNTErrors(denseRatio == 1.0F, "Only dense tensors are supported in Get(offset).");
     
-    int * value = (int*)data + offset;
+    int * address = (int*)data + offset;
     
-    return ToCPUInt(devID, value);
+    return ToCPUInt(devID, address);
 }
 
 /*
@@ -2190,6 +2209,21 @@ void InitTensor(XTensor * tensor, const XTensor * reference)
                reference->devID, reference->mem);
 }
     
+/*
+initialize a tensor on the CPU with a reference tensor
+>> tensor - the tensor we intend to initialize
+>> reference - the reference tensor
+*/
+void InitTensorOnCPU(XTensor * tensor, const XTensor * reference)
+{
+    if(reference->order < 0)
+        return;
+    
+    InitTensor(tensor, reference->order, reference->dimSize,
+               reference->dataType, reference->denseRatio,
+               -1);
+}
+    
 /* generate a XTensor with no initialization */
 XTensor * NewTensor()
 {

source/tensor/XTensor.h

@@ -319,6 +319,9 @@ public:
     /* get the value of a cell with the index */
     DTYPE Get(int index[], int size = -1);
     
+    /* get the value of a cell with the offset */
+    DTYPE Get(int offset);
+
     /* get the pointer to a cell */
     void * GetCell(int index[], int size = -1) const;
 
@@ -462,6 +465,9 @@ void InitTensor5D(XTensor * tensor, const int d0, const int d1, const int d2, co
 /* initialize a tensor with a reference tensor */
 void InitTensor(XTensor * tensor, const XTensor * reference);
     
+/* initialize a tensor on the CPU with a reference tensor */
+void InitTensorOnCPU(XTensor * tensor, const XTensor * reference);
+    
 /* generate a XTensor with no initialization */
 XTensor * NewTensor();