HashMap.h

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#pragma once

#include "open3d/core/Dtype.h"
#include "open3d/core/Tensor.h"
#include "open3d/core/hashmap/HashBackendBuffer.h"

namespace open3d {
namespace core {

class DeviceHashBackend;

enum class HashBackendType { Slab, StdGPU, TBB, Default };

class HashMap {
public:
    HashMap(int64_t init_capacity,
            const Dtype& key_dtype,
            const SizeVector& key_element_shape,
            const Dtype& value_dtype,
            const SizeVector& value_element_shapes,
            const Device& device,
            const HashBackendType& backend = HashBackendType::Default);

    HashMap(int64_t init_capacity,
            const Dtype& key_dtype,
            const SizeVector& key_element_shape,
            const std::vector<Dtype>& dtypes_value,
            const std::vector<SizeVector>& element_shapes_value,
            const Device& device,
            const HashBackendType& backend = HashBackendType::Default);

    ~HashMap() = default;

    void Reserve(int64_t capacity);

    std::pair<Tensor, Tensor> Insert(const Tensor& input_keys,
                                     const Tensor& input_values);

    std::pair<Tensor, Tensor> Insert(
            const Tensor& input_keys,
            const std::vector<Tensor>& input_values_soa);

    std::pair<Tensor, Tensor> Activate(const Tensor& input_keys);

    std::pair<Tensor, Tensor> Find(const Tensor& input_keys);

    Tensor Erase(const Tensor& input_keys);

    Tensor GetActiveIndices() const;

    void Insert(const Tensor& input_keys,
                const Tensor& input_values,
                Tensor& output_buf_indices,
                Tensor& output_masks);

    void Insert(const Tensor& input_keys,
                const std::vector<Tensor>& input_values_soa,
                Tensor& output_buf_indices,
                Tensor& output_masks);

    void Activate(const Tensor& input_keys,
                  Tensor& output_buf_indices,
                  Tensor& output_masks);

    void Find(const Tensor& input_keys,
              Tensor& output_buf_indices,
              Tensor& output_masks);

    void Erase(const Tensor& input_keys, Tensor& output_masks);

    void GetActiveIndices(Tensor& output_buf_indices) const;

    void Clear();

    void Save(const std::string& file_name);

    static HashMap Load(const std::string& file_name);

    HashMap Clone() const;

    HashMap To(const Device& device, bool copy = false) const;

    int64_t Size() const;

    int64_t GetCapacity() const;

    int64_t GetBucketCount() const;

    Device GetDevice() const;

    Tensor GetKeyTensor() const;

    std::vector<Tensor> GetValueTensors() const;

    Tensor GetValueTensor(size_t index = 0) const;

    std::vector<int64_t> BucketSizes() const;

    float LoadFactor() const;

    std::shared_ptr<DeviceHashBackend> GetDeviceHashBackend() const {
        return device_hashmap_;
    }

protected:
    void Init(int64_t init_capacity,
              const Device& device,
              const HashBackendType& backend);

    void InsertImpl(const Tensor& input_keys,
                    const std::vector<Tensor>& input_values_soa,
                    Tensor& output_buf_indices,
                    Tensor& output_masks,
                    bool is_activate_op = false);

    void CheckKeyLength(const Tensor& input_keys) const;
    void CheckKeyValueLengthCompatibility(
            const Tensor& input_keys,
            const std::vector<Tensor>& input_values_soa) const;
    void CheckKeyCompatibility(const Tensor& input_keys) const;
    void CheckValueCompatibility(
            const std::vector<Tensor>& input_values_soa) const;

    void PrepareIndicesOutput(Tensor& output_buf_indices, int64_t length) const;
    void PrepareMasksOutput(Tensor& output_masks, int64_t length) const;

    std::pair<int64_t, std::vector<int64_t>> GetCommonValueSizeDivisor();

private:
    std::shared_ptr<DeviceHashBackend> device_hashmap_;

    Dtype key_dtype_;
    SizeVector key_element_shape_;

    std::vector<Dtype> dtypes_value_;
    std::vector<SizeVector> element_shapes_value_;
};

}  // namespace core
}  // namespace open3d