(math_t *out, const math_t *coef, const int len, const math_t alpha,            cudaStream_t stream) {   LinAlg::rowNorm(out, coef, len, 0, LinAlg::NormType::L0Norm, true, stream);   LinAlg::scalarMultiply(out, out, alpha, 0, stream); }  template <typename math_t> void 