template class xf::data_analytics::text::TwoGramPredicate¶

#include "two_gram_predicate.hpp"

Overview¶

TwoGramPredicate the 2-Gram Predicate is a search of the inverted index with a term of 2 characters.

Parameters:

AXI_DT	AXI data type
CH	the channel of merge tree
BL	the burst length

template <
    typename AXI_DT,
    int CH = 64,
    int BL = 512
    >
class TwoGramPredicate

Methods¶

TwoGramPredicate¶

TwoGramPredicate ()

TwoGramPredicate constructor.

init¶

void init (
    int docSize,
    int fieldSize,
    double idfValue [TN],
    uint64_t tfAddr [TN]
    )

init the parameter initial function

Parameters:

docSize	the document size
fieldSize	all field’s string length
idfValue	the idfValue buffer that stores idf value
tfAddr	the tfAddr buffer that stores tf address

search¶

void search (
    uint8_t* field,
    uint32_t* offset,
    AXI_DT* tfValue,
    AXI_DT* tfValue2,
    AXI_DT* tfValue3,
    AXI_DT* tfValue4,
    uint32_t* indexId
    )

search Find the matching id in the inverted index.

Parameters:

field	One column field
offset	The offset address of field
tfValue	The first pointer of term frequency values in memory
tfValue	The second pointer of term frequency values in memory
the	index id of return