Tips on installing for pytorch>1.11, to avoid <THC/THC.h> bugs

[sijieaaa]

If you find bugs about <THC/THC.h>, you can do the following modifications:

1. uncomment this line:

   LIGA-Stereo/liga/ops/build_cost_volume/src/BuildCostVolume_cuda.cu

   Line 5 in aee3731

   #include <THC/THC.h>

2. define a new ceil_div function:

int  ceil_div(int a, int b){ 
    return  (a + b - 1) / b; 
}

3. replace this line:

   LIGA-Stereo/liga/ops/build_cost_volume/src/BuildCostVolume_cuda.cu

   Line 232 in aee3731

   dim3 grid(std::min(THCCeilDiv((long)(output_size / 2), 512L), 4096L));

   
   with
   dim3 grid(std::min(ceil_div((long)(output_size / 2), 512), 4096));

4. replace this line:

   LIGA-Stereo/liga/ops/build_cost_volume/src/BuildCostVolume_cuda.cu

   Line 278 in aee3731

   dim3 grid(std::min(THCCeilDiv((long)grad.numel(), 512L), 4096L));

   
   with
   dim3 grid(std::min(ceil_div((long)(grad.numel()), 512) , 4096));

5. replace THCudaCheck(cudaGetLastError()); with AT_CUDA_CHECK(cudaGetLastError());