view UNIT_TEST_LSH.cpp @ 400:8c7453fb5bd9 api-inversion

Invert audioDB::power_flag / audiodb_power()

Here the exciting discovery is that the mmap(), memcpy(), munmap()
sequence is in fact not safe.  In principle an msync() call should be
inserted before unmapping for in-core changes to mmap()ed files to be
flushed to disk.

In this case we work around the problem entirely, by not mmap()ing
anything and doing everything with file descriptors.  Amusingly, that's
probably not desperately safe either, this time because we have to move
the file descriptor position (which is also a shared resource).  dup()
doesn't save us, as the duplicate file descriptor shares a file
position.

This applies also to the filling of data_buffer in the query loop, and
in fact basically any call to lseek(), which is why I'm not fixing it
now.  Solution: if you have multiple threads all acting at once on a
single database, do one audiodb_open() per thread, for now at least.

// UNIT_TEST_LSH.cpp

#include <vector>
#include "lshlib.h"
#include "reporter.h"

#define LSH_IN_CORE


#define N_POINT_BITS 14
#define POINT_BIT_MASK 0x00003FFF

// Callback method for LSH point retrieval
void add_point(void* reporter, Uns32T pointID, Uns32T qpos, float dist)
{
  ReporterBase* pr = (ReporterBase*)reporter;
  pr->add_point(pointID>>N_POINT_BITS, qpos, pointID&POINT_BIT_MASK, dist);
}

int main(int argc, char* argv[]){

  int nT = 100; // num tracks 
  int nP = 1000;  // num points-per-track
  float w = 4.0;// LSH bucket width
  int k = 10;
  int m = 2;
  int d = 10;
  int N = 100000;
  int C = 200;

  float radius = 0.001;
  char FILENAME[] = "foo.lsh";

  assert(nP>=nT);

  int fid = open(FILENAME,O_RDONLY);
  LSH* lsh;
  bool serialized = false;
  Uns32T trackBase = 0;

  if(fid< 0){ // Make a new serial LSH file
    lsh = new LSH(w,k,m,d,N,C,radius);
    assert(lsh);
    cout << "NEW LSH:" << endl;
    }
  else{
    close(fid); // Load LSH structures from disk
    lsh = new LSH(FILENAME); 
    assert(lsh);
    cout << "MERGE WITH EXISTING LSH:" << FILENAME << endl;
    serialized=true;
    trackBase = (lsh->get_maxp()>>N_POINT_BITS)+1; // Our encoding of tracks and points
  }  
  cout << "k:" << lsh->get_numFuns() << " ";
  cout << "L:" << lsh->get_numTables() << " ";
  cout << "d:" << lsh->get_dataDim() << " ";
  cout << "N:" << lsh->get_numRows() << " ";
  cout << "C:" << lsh->get_numCols() << " ";
  cout << "R:" << lsh->get_radius() << " ";
  cout << "p:" << lsh->get_maxp() << endl;
  cout.flush();

  cout << endl << "Constructing " << nT << " tracks with " << nP << " vectors of dimension " << d << endl;
  cout.flush();
  // Construct sets of database vectors, use one point from each set for testing
  vector< vector<float> > vv = vector< vector<float> >(nP); // track vectors
  vector< vector<float> > qq = vector< vector<float> >(nP);// query vectors
  for(int i=0; i< nP ; i++){
    vv[i]=vector<float>(d);  // allocate vector
    qq[i]=vector<float>(d);  // allocate vector
  }
  
  for(int k = 0 ; k < nT ; k ++){
    cout << "[" << k << "]";
    cout.flush();
    for(int i = 0 ; i< nP ; i++)
      for(int j=0; j< d ; j++)
	vv[i][j] =   genrand_real2() / radius; // MT_19937 random numbers
    lsh->insert_point_set(vv, (trackBase+k)<<N_POINT_BITS);
    qq[k] = vv[k]; // One identity query per set of database vectors
  }
  cout << endl;
  cout.flush();

  cout << "Writing serialized LSH tables..." << endl;
  // TEST SERIALIZED LSH RETRIEVAL
  lsh->serialize(FILENAME);

  // TEST LSH RETRIEVAL IN CORE
  printf("\n********** In-core LSH retrieval from %d track%c **********\n", 
	 (lsh->get_maxp()>>N_POINT_BITS)+1,(lsh->get_maxp()>>N_POINT_BITS)>0?'s':' ');
  fflush(stdout);  
  for(int i = 0; i < nT ; i++ ){
    trackSequenceQueryRadNNReporter* pr = new trackSequenceQueryRadNNReporter(nP,nT,(lsh->get_maxp()>>N_POINT_BITS)+1); 
    lsh->retrieve_point(qq[i], i, &add_point, (void*)pr); // LSH point retrieval from core
    printf("query vector %d] t1:%u t2:%0X\n", i, lsh->get_t1(), lsh->get_t2());
    fflush(stdout);
    pr->report(0,0);
    delete pr;
  }
  delete lsh;

  cout << "Loading Serialized LSH functions from disk ..." << endl;
  cout.flush();
  lsh = new LSH(FILENAME);
  assert(lsh);  
  //  lsh->serial_dump_tables(FILENAME);
  printf("\n********** Serialized LSH retrieval from %d track%c **********\n", (lsh->get_maxp()>>N_POINT_BITS)+1,(lsh->get_maxp()>>N_POINT_BITS)>1?'s':' ');
  fflush(stdout);  
  for(int i= 0; i < nT ; i++ ){
    trackSequenceQueryRadNNReporter* pr = new trackSequenceQueryRadNNReporter(nP,nT,(lsh->get_maxp()>>N_POINT_BITS)+1); 
    lsh->serial_retrieve_point(FILENAME, qq[i], i, &add_point, (void*) pr); // LSH serialized point retrieval method  
    printf("query vector %d] t1:%u t2:%0X\n", i, lsh->get_t1(), lsh->get_t2());
    fflush(stdout);
    pr->report(0,0);
    delete pr;
  }  
  delete lsh;

#ifdef LSH_IN_CORE  
  cout << "Loading Serialized LSH functions and tables from disk ..." << endl;
  cout.flush();
  // Unserialize entire lsh tree to core
  lsh = new LSH(FILENAME,1);
  
  // TEST UNSERIALIZED LSH RETRIEVAL IN CORE
  printf("\n********** Unserialized LSH in-core retrieval from %d track%c **********\n", (lsh->get_maxp()>>N_POINT_BITS)+1,(lsh->get_maxp()>>N_POINT_BITS)>1?'s':' ');
  fflush(stdout);
  for(int i = 0; i < nT ; i++ ){
    trackSequenceQueryRadNNReporter* pr = new trackSequenceQueryRadNNReporter(nP,nT,(lsh->get_maxp()>>N_POINT_BITS)+1); 
    lsh->retrieve_point(qq[i], i, &add_point, (void*) pr); // LSH point retrieval from core
    printf("query vector %d] t1:%u t2:%0X\n", i, lsh->get_t1(), lsh->get_t2());
    fflush(stdout);
    pr->report(0,0);
    delete pr;
  }  
  delete lsh;
#endif

}