install from source ,i get some error!!!

```
error generating file 
/pytorch-master/torch/lob/build/THC/CMakeFiles/THC.dir//./THC_generated+THCTensorMathscan.cu.o
make[2]:***[CMakeFiles/THC.dir/./THC_generated_THCTensorMathScan.cu.o] Error 1
make[1]:***[CMakeFiles/THC.dir/all] Error 2
make:***[all] error
```