CUDA error: CUBLAS_STATUS_NOT_INITIALIZED when calling `cublasCreate(handle)`

This error occurs when the CUBLAS library has not been initialized properly before calling the `cublasCreate()` function.

To fix this error, make sure that you have included the necessary header files and linked the CUBLAS library to your project. Additionally, you should call the `cudaSetDevice()` function to select the GPU device before initializing CUBLAS.

Here is an example code snippet that demonstrates how to properly initialize CUBLAS:

#include <cuda.h>
#include <cublas_v2.h>

int main() {
    // Select the GPU device
    cudaSetDevice(0);

    // Initialize CUBLAS
    cublasHandle_t handle;
    cublasStatus_t status = cublasCreate(&handle);
    if (status != CUBLAS_STATUS_SUCCESS) {
        printf("CUBLAS initialization failed\n");
        return 1;
    }

    // Use CUBLAS functions here...

    // Destroy the CUBLAS handle
    cublasDestroy(handle);

    return 0;
}