TriCPU.cpp

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// ----------------------------------------------------------------------------
// -                        CloudViewer: www.cloudViewer.org                  -
// ----------------------------------------------------------------------------
// Copyright (c) 2018-2024 www.cloudViewer.org
// SPDX-License-Identifier: MIT
// ----------------------------------------------------------------------------
 
#include "cloudViewer/core/Dispatch.h"
#include "cloudViewer/core/Indexer.h"
#include "cloudViewer/core/ParallelFor.h"
#include "cloudViewer/core/Tensor.h"
#include "cloudViewer/core/linalg/TriImpl.h"
 
namespace cloudViewer {
namespace core {
 
void TriuCPU(const Tensor &A, Tensor &output, const int diagonal) {
    DISPATCH_DTYPE_TO_TEMPLATE(A.GetDtype(), [&]() {
        const scalar_t *A_ptr = static_cast<const scalar_t *>(A.GetDataPtr());
        scalar_t *output_ptr = static_cast<scalar_t *>(output.GetDataPtr());
        int cols = A.GetShape()[1];
        int n = A.GetShape()[0] * cols;
 
        ParallelFor(A.GetDevice(), n,
                    [&] CLOUDVIEWER_DEVICE(int64_t workload_idx) {
                        const int64_t idx = workload_idx / cols;
                        const int64_t idy = workload_idx % cols;
                        if (idy - idx >= diagonal) {
                            output_ptr[workload_idx] = A_ptr[idx * cols + idy];
                        }
                    });
    });
}
 
void TrilCPU(const Tensor &A, Tensor &output, const int diagonal) {
    DISPATCH_DTYPE_TO_TEMPLATE(A.GetDtype(), [&]() {
        const scalar_t *A_ptr = static_cast<const scalar_t *>(A.GetDataPtr());
        scalar_t *output_ptr = static_cast<scalar_t *>(output.GetDataPtr());
        int cols = A.GetShape()[1];
        int n = A.GetShape()[0] * cols;
 
        ParallelFor(A.GetDevice(), n,
                    [&] CLOUDVIEWER_DEVICE(int64_t workload_idx) {
                        const int64_t idx = workload_idx / cols;
                        const int64_t idy = workload_idx % cols;
                        if (idy - idx <= diagonal) {
                            output_ptr[workload_idx] = A_ptr[idx * cols + idy];
                        }
                    });
    });
}
 
void TriulCPU(const Tensor &A,
              Tensor &upper,
              Tensor &lower,
              const int diagonal) {
    DISPATCH_DTYPE_TO_TEMPLATE(A.GetDtype(), [&]() {
        const scalar_t *A_ptr = static_cast<const scalar_t *>(A.GetDataPtr());
        scalar_t *upper_ptr = static_cast<scalar_t *>(upper.GetDataPtr());
        scalar_t *lower_ptr = static_cast<scalar_t *>(lower.GetDataPtr());
        int cols = A.GetShape()[1];
        int n = A.GetShape()[0] * cols;
 
        ParallelFor(A.GetDevice(), n,
                    [&] CLOUDVIEWER_DEVICE(int64_t workload_idx) {
                        const int64_t idx = workload_idx / cols;
                        const int64_t idy = workload_idx % cols;
                        if (idy - idx < diagonal) {
                            lower_ptr[workload_idx] = A_ptr[idx * cols + idy];
                        } else if (idy - idx > diagonal) {
                            upper_ptr[workload_idx] = A_ptr[idx * cols + idy];
                        } else {
                            lower_ptr[workload_idx] = 1;
                            upper_ptr[workload_idx] = A_ptr[idx * cols + idy];
                        }
                    });
    });
}
 
}  // namespace core
}  // namespace cloudViewer