                 0,
                 THCudaTensor_data(gradColumns), n
                 );
-    THCublasCheck();
           
     // Unpack columns back into input:
     col2im(

    long k_ = 1;

    // Do GEMM (note: this is a bit confusing because gemm assumes column-major matrices)
    cublasSgemm(
      't', 'n',
      n_, m_, k_,
      1, 

                1,
                THCudaTensor_data(gradWeight), n
                );
    
    // Do Bias: 
    // M,N,K are dims of matrix A and B
