Bug fixed.

Fix the bug in destroy the stream of XDevice.

source/tensor/XTensor.cpp

@@ -147,12 +147,6 @@ XTensor::XTensor(const int myOrder, const int* myDimSize, const TENSOR_DATA_TYPE
 
     if(order >= 0)
         Resize(myOrder, myDimSize, myDataType, myDenseRatio);
-
-#ifdef USE_CUDA
-    int gpuNum = 0;
-    cudaError_t error = cudaGetDeviceCount(&gpuNum);
-#endif
-    atexit(XDevManager::DelDeviceStream);
 }
 
 /* copy constructor */