Function compare

src/callback-client/callback-client.cpp:487–517

//Compare reference and opencl output 
template < typename T1, typename T2>
bool compare(T1 *refData, std::vector< T2 > data,
             size_t length, const float epsilon)
{
    float error = 0.0f;
    T1 ref;
	T1 diff;
	float normRef = 0.0f;
	float normError = 0.0f;

    for(size_t i = 0; i < length; ++i)
    {
        diff[0] = refData[i][0] - data[i];
        error += (float)(diff[0] * diff[0]);
        ref[0] += refData[i][0] * refData[i][0];
    }
	if (error != 0)
	{
		normRef =::sqrtf((float) ref[0]);
		if (::fabs((float) ref[0]) < 1e-7f)
		{
			return false;
		}
		normError = ::sqrtf((float) error);
		error = normError / normRef;
    
		if (error > epsilon)
			return false;
	}

		return true;
    }

// Compute reference output using fftw for float type
fftwf_complex* get_R2C_fftwf_output(size_t* lengths, size_t fftbatchLength, int batch_size,