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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include <iostream>
#include <iomanip>
#include "permuter.h"
#include "selector.h"
#include "ngram.h"
#include "base64.h"
using namespace fsa;
unsigned int gram_count(unsigned int mg, unsigned int q)
{
unsigned int i,j,c1,c2,ct=0;
for(i=2;i<=mg;i++){
c1=1;c2=1;
for(j=(i>q-i)?(i+1):(q-i+1);j<=q;j++){
c1*=j;
c2*=(q-j)+1;
}
ct+=c1/c2;
}
return ct;
}
int main(int argc, char **argv)
{
const unsigned int MAXQUERY = 10;
const unsigned int MAXGRAM = 6;
Permuter p;
NGram query,gram;
Selector s;
std::string qstr;
unsigned int qlen,glen;
bool verbose=true;
unsigned int i;
double total,ctotal;
int stats[MAXQUERY+1];
for(i=0;i<=MAXQUERY;i++)
stats[i]=0;
while(!std::cin.eof()){
getline(std::cin,qstr);
query.set(qstr,1);
qlen = query.length();
if(2<=qlen && qlen<=MAXQUERY){
stats[qlen]++;
std::cout << "QUERY: " << query << std::endl;
query.sort();
qlen = query.uniq();
unsigned int glen=qlen<MAXGRAM?qlen:MAXGRAM;
for(unsigned int n=2;n<=glen;n++){
unsigned int c=Permuter::firstComb(n,qlen);
while(c>0){
s.clear();
s.set(c);
gram.set(query,s);
std::cout << " " << gram << std::endl;
c=Permuter::nextComb(c,qlen);
}
}
}
else{
if(qlen<2)
stats[0]++;
else
stats[1]++;
}
}
if(verbose){
total=0.0;ctotal=0.0;
for(i=0;i<=MAXQUERY;i++)
total+=stats[i];
std::cerr << std::fixed << std::setprecision(4) << std::endl;
std::cerr << "Statistics:" << std::endl;
std::cerr << std::endl;
std::cerr << " Empty or single term: " <<
std::setw(12) << stats[0] << " " <<
std::setw(7) << double(stats[0])*100.0/total << "%" << std::endl;
std::cerr << " Too long: " <<
std::setw(12) << stats[1] << " " <<
std::setw(7) << double(stats[1])*100.0/total << "%" << std::endl;
for(i=2;i<=MAXQUERY;i++){
std::cerr << " Length " << std::setw(2) << i << " (grams " << std::setw(3) <<
gram_count(i<MAXGRAM?i:MAXGRAM,i) << "): " <<
std::setw(12) << stats[i] << " " <<
std::setw(7) << double(stats[i])*100.0/total << "%" << std::endl;
ctotal+=stats[i]*gram_count(i<MAXGRAM?i:MAXGRAM,i);
}
std::cerr << " Total: " <<
std::setw(12) << std::setprecision(0) << total << std::endl;
std::cerr << std::endl;
std::cerr << "Average number of grams per query: " <<
std::setprecision(2) << ctotal/total << std::endl;
std::cerr << std::endl;
}
return 0;
}
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