knn - 2023.2 English

#include "xf_data_analytics/geospatial/knn.hpp"

template <
    int CSV_PU_NUM = 2,
    int MAX_SORT_NUM = 8
    >
void knn (
    ap_uint <128>* csv_buf,
    ap_uint <8>* schema,
    float base_x,
    float base_y,
    int k,
    float* sorted_dist_buf,
    uint32_t* sorted_idx_buf
    )

K Nearest Neighbors(KNN): find nearest-K points for a given base point.

Parameters:

CSV_PU_NUM	num of csv parser core used to parallel parse csv data, only support 2/4/8
MAX_SORT_NUM	the max number of the sequence can be sorted, should be less than 1024
csv_buf	input csv data
schema	input csv schema
base_x	base point x coordinate
base_y	base point y coordinate
k	num of nearest point, k <= MAX_SORT_NUM
sorted_dist_buf	output distance of nearest-K points
sorted_idx_buf	output index of nearest-K points