l2NormGPU function
Implementation
GPUTensor<Scalar> l2NormGPU(GPUTensor<Vector> v, CommandBuffer tape) {
// sqrt( sum( v^2 ) )
GPUTensor<Vector> squared = powGPU<Vector>(v, 2.0, tape);
GPUTensor<Scalar> sumOfSquares = sumGPU(squared, tape);
return sqrtGPU<Scalar>(sumOfSquares, tape);
}