fix the bug of missing leaddim parameter in XLink of softmax

source/network/XBackwardFunc.cpp

@@ -50,6 +50,7 @@ void XFuncGrad::MakeGrad(XTensor * node)
         _IdentityBackward(NULL, output, input, output->grad, input->grad, NOLOSS);
     else if(operID == FUNC_LOGSOFTMAX){
         int leadDim = income.GetParamInt(0);
+        CheckNTErrors(leadDim >= 0 && leadDim < input->order, "wrong leading dimension in logsoftmax!");
         _LogSoftmaxBackward(NULL, output, input, output->grad, input->grad, leadDim, NOLOSS);
     }
     else if(operID == FUNC_RECTIFY)
@@ -58,6 +59,7 @@ void XFuncGrad::MakeGrad(XTensor * node)
         _SigmoidBackward(NULL, output, input, output->grad, input->grad, NOLOSS);
     else if(operID == FUNC_SOFTMAX){
         int leadDim = income.GetParamInt(0);
+        CheckNTErrors(leadDim >= 0 && leadDim < input->order, "wrong leading dimension in softmax!");
         _SoftmaxBackward(NULL, output, input, output->grad, input->grad, leadDim, NOLOSS);
     }
     else{

source/tensor/function/LogSoftmax.cpp

@@ -176,15 +176,19 @@ make a new tensor to keep the result and return it
 */
 XTensor LogSoftmax(const XTensor &x, int leadDim)
 {
+    int ld = leadDim;
+    if (ld < 0)
+        ld = x.order - 1;
+
     XTensor y(&x);
     y.SetTMP();
 
     /* call _LogSoftmax function */
-    _LogSoftmax(&x, &y, leadDim);
+    _LogSoftmax(&x, &y, ld);
 
     /* tensor connection */
     XLink::MakeLink(&x, NULL, &y, FUNC_LOGSOFTMAX);
-    XLink::AddParamToHeadInt(&y, leadDim);
+    XLink::AddParamToHeadInt(&y, ld);
 
     return y;
 }

source/tensor/function/Softmax.cpp

@@ -143,14 +143,19 @@ make a new tensor to keep the result and return it
 */
 XTensor Softmax(const XTensor &x, int leadDim)
 {
+    int ld = leadDim;
+    if (ld < 0)
+        ld = x.order - 1;
+
     XTensor y(&x);
     y.SetTMP();
 
     /* call _Softmax function */
-    _Softmax(&x, &y, leadDim);
+    _Softmax(&x, &y, ld);
 
     /* tensor connection */
     XLink::MakeLink(&x, NULL, &y, FUNC_SOFTMAX);
+    XLink::AddParamToHeadInt(&y, ld);
 
     return y;
 }