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Returns the squared norm of the input tensor.
References syten::CudaDenseTensorImpl::CudaDenseTensor< rank, Scalar >::normSqd().
Referenced by syten::Pyten::init_ipeps_state(), syten::MPS::DMRG::Worker::sweepLeft2sVar(), and syten::MPS::DMRG::Worker::sweepRight2sVar().