Roll back some codes.

Find some bugs during training NMT system. We decide to roll back some codes to the last version. These codes need to be reviewed.

source/network/XBackwardMath.cpp

@@ -975,7 +975,7 @@ void XMathGrad::GradPower(XTensor * node, bool isEfficient)
 
         XTensor * tmp = NewTensorBufV2(a, a->devID, a->mem);
         _Power(a, tmp, p - 1.0F);
-        _ScaleMe(tmp, p);
+        _ScaleAndShiftMe(tmp, p);
         _Multiply(node->grad, tmp, a->grad, 1.0F);
 
         DelTensorBuf(tmp);

source/tensor/XList.h

@@ -127,14 +127,7 @@ public:
     void ReadFromFile(FILE* fp, int num);
 
     /* short */
-    T& operator[] (int i) { 
-        CheckNTErrors(i >= -count && i < count, "Index of a list item is out of scope!");
-        CheckNTErrors(count > 0, "Cannt index the item in an empty list!");
-        if (i < 0)
-            return items[count + i];
-        else
-            return items[i];
-    };
+    T& operator[] (int i) const { return GetItem(i); };
     T& Get(int i) const { return GetItem(i); };
     void Set(int i, T item) { SetItem(i, item); };
 };

source/tensor/core/math/Compare.cpp

@@ -92,10 +92,6 @@ XTensor funcName(const XTensor &a, DTYPE number)
     XTensor b(&a);                                                                   \
     b.SetTMPFlag();                                                                  \
     _funcName(&a, &b, number);                                                       \
-    if (a.enableGrad) {                                                              \
-        XLink::MakeLink(&a, NULL, &b, operationId);                                  \
-        XLink::AddParamToHead(&b, (DTYPE)number);                                    \
-    }                                                                                \
     return b;                                                                        \
 }
                                                                                      
@@ -106,10 +102,6 @@ void funcName(const XTensor &a, XTensor &b, DTYPE number)
         InitTensorV2(&b, &a);                                                        \
     }                                                                                \
     _funcName(&a, &b, number);                                                       \
-    if (a.enableGrad) {                                                              \
-        XLink::MakeLink(&a, NULL, &b, operationId);                                  \
-        XLink::AddParamToHead(&b, (DTYPE)number);                                    \
-    }                                                                                \
 }
 
 // I think we needn't to make link.
@@ -194,9 +186,6 @@ XTensor funcName(const XTensor & a, const XTensor & b)
     XTensor c(&a);                                                                   \
     c.SetTMPFlag();                                                                  \
     _funcName(&a, &b, &c);                                                           \
-    if (a.enableGrad && b.enableGrad) {                                              \
-        XLink::MakeLink(&a, &b, &c, operationId);                                    \
-    }                                                                                \
     return c;                                                                        \
 }
                                                                                      
@@ -207,9 +196,6 @@ void funcName(const XTensor &a, const XTensor &b, XTensor c)
         InitTensor(&c, &a);                                                          \
     }                                                                                \
     _funcName(&a, &b, &c);                                                           \
-    if (a.enableGrad && b.enableGrad) {                                              \
-        XLink::MakeLink(&a, &b, &c, operationId);                                    \
-    }                                                                                \
 }
 
 #ifdef USE_CUDA