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|
// _____ _ _ _____ _ _ _ _ _ _
// |_ _( ) | | |_ _| (_) | | | (_) | | | |
// | | |/ _ __ ___ __ _ _ __ ___ _ _ _ __ __| | ___ _ __ ___ _ __ | | _ _ _ ___| |_ | |_ ___| |_ ___ _ __ ___ __| |
// | | | '_ ` _ \ / _` | | '_ ` _ \| | | | '__/ _` |/ _ \ '__/ _ \ '__| | | | | | | / __| __| | | / __| __/ _ \ '_ \ / _ \/ _` |
// _| |_ | | | | | | | (_| | | | | | | | |_| | | | (_| | __/ | | __/ |_ _| |_ | | |_| \__ \ |_ | | \__ \ || __/ | | | __/ (_| |
// |_____| |_| |_| |_| \__,_| |_| |_| |_|\__,_|_| \__,_|\___|_| \___|_(_) |_____| | |\__,_|___/\__| |_|_|___/\__\___|_| |_|\___|\__,_|
// _ _ __ _ _ _ _/ | __ _ _
// | | | |/ _| (_) | | (_) |__/ / _| | | | |
// | |_ ___ _ __ ___ _ _ ___ ___| | |_ _ _ _ __ _ _ __ __ _| |_ _ _ __ __ _ | |_ ___ _ __ | |_| |__ _ __ ___ ___
// | __/ _ \ | '_ ` _ \| | | / __|/ _ \ | _| | | | | '__| | '_ \ / _` | __| | '_ \ / _` | | _/ _ \| '__| | __| '_ \| '__/ _ \/ _ \
// | || (_) | | | | | | | |_| \__ \ __/ | | | |_| | | | | | | | (_| | |_| | | | | (_| | | || (_) | | | |_| | | | | | __/ __/
// \__\___/ |_| |_| |_|\__, |___/\___|_|_| \__,_|_| |_|_| |_|\__,_|\__|_|_| |_|\__, | |_| \___/|_| \__|_| |_|_| \___|\___|
// _ __/ | ______ _ _ _ _ _ _ __/ | _ _
// | | |___/ | ____| | | | | | | (_) (_| ) |___/ (_) | |
// | |__ ___ _ __ _ _ ___ | |__ _ _ ___| | __ | |_| |__ _ ___ _|/ _ __ ___ __ _ ___ _ _ __ __ _ | |_ ___
// | '_ \ / _ \| '__| | | / __| | __| | | |/ __| |/ / | __| '_ \| / __| | | | '_ ` _ \ / _` |/ _ \| | '_ \ / _` | | __/ _ \
// | | | | (_) | | | |_| \__ \_ | | | |_| | (__| < | |_| | | | \__ \_ | | | | | | | | | (_| | (_) | | | | | (_| | | || (_) |
// |_| |_|\___/|_| \__,_|___(_) |_| \__,_|\___|_|\_\ \__|_| |_|_|___(_) |_| |_| |_| |_| \__, |\___/|_|_| |_|\__, | \__\___/
// __/ | __/ |
// _ _ _ _ |___/ |___/
// | | (_) | | | | |
// _ __ ___ _ __ | | __ _ ___ ___ ___ __ _ __ _ __ ___| |_| |__ ___ __ _ __ _ _ __ ___ _ __ | | __ _ ___ ___ _ __
// | '__/ _ \ '_ \| |/ _` |/ __/ _ \ / _ \/ _` |/ _` | \ \ /\ / / | __| '_ \ / _ \/ _` |/ _` | | '__/ _ \ '_ \| |/ _` |/ __/ _ \ '__|
// | | | __/ |_) | | (_| | (_| __/ | __/ (_| | (_| | \ V V /| | |_| | | | | __/ (_| | (_| | | | | __/ |_) | | (_| | (_| __/ |
// |_| \___| .__/|_|\__,_|\___\___| \___|\__, |\__, | \_/\_/ |_|\__|_| |_| \___|\__, |\__, | |_| \___| .__/|_|\__,_|\___\___|_|
// | | _ _ _ _ __/ | __/ | _ _ _ __/ | __/ | | |
// |_| | | (_) | | |___/ |___(_) | | | | | |___/ |___/ |_|
// __ _ _ __ __| | _ __ ___ _| | | __ __ ___| |_| |__ __ ____ _| |_
// / _` | '_ \ / _` | | '_ ` _ \| | | |/ / \ \ /\ / / | __| '_ \ \ \ /\ / / _` | __|
// | (_| | | | | (_| | | | | | | | | | < \ V V /| | |_| | | | \ V V / (_| | |_
// \__,_|_| |_|\__,_| |_| |_| |_|_|_|_|\_\ \_/\_/ |_|\__|_| |_| \_/\_/ \__,_|\__|
//
//
#include "kgramstats.h"
#include <vector>
#include <iostream>
#include <cstdlib>
#include <algorithm>
#include "malaprop.h"
query wildcardQuery(querytype_sentence);
std::string canonize(std::string f);
// runs in O(t^2) time where t is the number of tokens in the input corpus
// We consider maxK to be fairly constant
kgramstats::kgramstats(std::string corpus, int maxK)
{
this->maxK = maxK;
std::vector<std::string> tokens;
size_t start = 0;
int end = 0;
while (end != std::string::npos)
{
end = corpus.find(" ", start);
std::string token = corpus.substr(start, (end == std::string::npos) ? std::string::npos : end - start);
if (token[token.length()-1] == '\n')
{
if ((token[token.length()-2] != '.') && (token[token.length()-2] != '!') && (token[token.length()-2] != '?') && (token[token.length()-2] != ','))
{
token.insert(token.length()-1, ".");
}
token.resize(token.length()-1);
}
if (token.compare("") && token.compare("."))
{
mstats.addWord(token);
tokens.push_back(token);
}
start = ((end > (std::string::npos - 1) ) ? std::string::npos : end + 1);
}
std::map<kgram, std::map<token, token_data> > tstats;
std::map<token, std::map<termstats, int> > tendings;
for (int k=1; k<maxK; k++)
{
for (int i=0; i<(tokens.size() - k); i++)
{
std::list<std::string> seq(tokens.begin()+i, tokens.begin()+i+k);
kgram prefix;
for (std::list<std::string>::iterator it = seq.begin(); it != seq.end(); it++)
{
token word(canonize(*it));
if (it->find_first_of(".?!,") != std::string::npos)
{
word.terminating = true;
}
prefix.push_back(word);
}
std::string f = tokens[i+k];
std::string canonical = canonize(f);
token word(canonical);
if (f.find_first_of(".?!,") != std::string::npos)
{
word.terminating = true;
char terminator = f[f.find_last_of(".?!,")];
int occurrences = std::count(f.begin(), f.end(), terminator);
tendings[word][termstats(terminator, occurrences)]++;
}
token_data& td = tstats[prefix][word];
td.word = word;
td.all++;
if (std::find_if(f.begin(), f.end(), ::islower) == f.end())
{
td.uppercase++;
} else if (isupper(f[0]))
{
td.titlecase++;
}
if (prefix.front().word.terminating)
{
prefix.front() = wildcardQuery;
token_data& td2 = tstats[prefix][word];
td2.word = word;
td2.all++;
if (std::find_if(f.begin(), f.end(), ::islower) == f.end())
{
td2.uppercase++;
} else if (isupper(f[0]))
{
td2.titlecase++;
}
}
}
}
for (std::map<kgram, std::map<token, token_data> >::iterator it = tstats.begin(); it != tstats.end(); it++)
{
kgram klist = it->first;
std::map<token, token_data>& probtable = it->second;
std::map<int, token_data>& distribution = stats[klist];
int max = 0;
for (std::map<token, token_data>::iterator kt = probtable.begin(); kt != probtable.end(); kt++)
{
max += kt->second.all;
distribution[max] = kt->second;
}
}
for (std::map<token, std::map<termstats, int> >::iterator it = tendings.begin(); it != tendings.end(); it++)
{
token word = it->first;
std::map<termstats, int>& probtable = it->second;
std::map<int, termstats>& distribution = endings[word];
int max = 0;
for (std::map<termstats, int>::iterator kt = probtable.begin(); kt != probtable.end(); kt++)
{
max += kt->second;
distribution[max] = kt->first;
}
}
}
void printKgram(kgram k)
{
for (kgram::iterator it = k.begin(); it != k.end(); it++)
{
query& q = *it;
if (q.type == querytype_sentence)
{
std::cout << "#.# ";
} else if (q.type == querytype_literal)
{
if (q.word.terminating)
{
std::cout << q.word.canon << ". ";
} else {
std::cout << q.word.canon << " ";
}
}
}
}
// runs in O(n log t) time where n is the input number of sentences and t is the number of tokens in the input corpus
std::vector<std::string> kgramstats::randomSentence(int n)
{
std::vector<std::string> result;
kgram cur(1, wildcardQuery);
int cuts = 0;
for (int i=0; i<n; i++)
{
if (cur.size() == maxK)
{
cur.pop_front();
}
if (cur.size() > 0)
{
if (rand() % (maxK - cur.size() + 1) == 0)
{
while (cur.size() > 2)
{
if ((rand() % (n)) < cuts)
{
cur.pop_front();
cuts--;
} else {
break;
}
}
}
cuts++;
}
// Gotta circumvent the last line of the input corpus
// https://twitter.com/starla4444/status/684222271339237376
if (stats.count(cur) == 0)
{
cur = kgram(1, wildcardQuery);
}
std::map<int, token_data>& distribution = stats[cur];
int max = distribution.rbegin()->first;
int r = rand() % max;
token_data& next = distribution.upper_bound(r)->second;
std::string nextToken(next.word.canon);
bool mess = (rand() % 100) == 0;
if (mess)
{
nextToken = mstats.alternate(nextToken);
}
// Determine the casing of the next token. We randomly make the token all
// caps based on the markov chain. Otherwise, we check if the previous
// token is the end of a sentence (terminating token or a wildcard query).
int casing = rand() % next.all;
if (casing < next.uppercase)
{
std::transform(nextToken.begin(), nextToken.end(), nextToken.begin(), ::toupper);
} else if ((((cur.rbegin()->type == querytype_sentence)
|| ((cur.rbegin()->type == querytype_literal)
&& (cur.rbegin()->word.terminating)))
&& (rand() % 2 > 0))
|| (casing - next.uppercase < next.titlecase))
{
nextToken[0] = toupper(nextToken[0]);
}
if (next.word.terminating)
{
std::map<int, termstats>& ending = endings[next.word];
int emax = ending.rbegin()->first;
int er = rand() % emax;
termstats& nextend = ending.upper_bound(er)->second;
nextToken.append(std::string(nextend.occurrences, nextend.terminator));
}
/* DEBUG */
printKgram(cur);
std::cout << "-> \"" << nextToken << "\" (" << next.all << "/" << max << ")";
if (mess)
{
std::cout << " mala " << next.word.canon;
}
std::cout << std::endl;
cur.push_back(next.word);
result.push_back(nextToken);
}
return result;
}
bool removeIf(char c)
{
return !((c != '.') && (c != '?') && (c != '!') && (c != ',') /*&& (c != '"') && (c != '(') && (c != ')') && (c != '\n')*/);
}
std::string canonize(std::string f)
{
std::string canonical(f);
std::transform(canonical.begin(), canonical.end(), canonical.begin(), ::tolower);
std::string result;
std::remove_copy_if(canonical.begin(), canonical.end(), std::back_inserter(result), removeIf);
return result;
}
|
