File size: 3,902 Bytes
158b61b |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 |
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <unistd.h>
#include <sys/types.h>
#include "Remote.h"
#include "moses/Factor.h"
#include "util/string_stream.hh"
#if !defined(_WIN32) && !defined(_WIN64)
#include <arpa/inet.h>
#endif
namespace Moses
{
const Factor* LanguageModelRemote::BOS = NULL;
const Factor* LanguageModelRemote::EOS = (LanguageModelRemote::BOS + 1);
bool LanguageModelRemote::Load(const std::string &filePath
, FactorType factorType
, size_t nGramOrder)
{
m_factorType = factorType;
m_nGramOrder = nGramOrder;
int cutAt = filePath.find(':',0);
std::string host = filePath.substr(0,cutAt);
//std::cerr << "port string = '" << filePath.substr(cutAt+1,filePath.size()-cutAt) << "'\n";
int port = atoi(filePath.substr(cutAt+1,filePath.size()-cutAt).c_str());
bool good = start(host,port);
if (!good) {
std::cerr << "failed to connect to lm server on " << host << " on port " << port << std::endl;
}
ClearSentenceCache();
return good;
}
bool LanguageModelRemote::start(const std::string& host, int port)
{
//std::cerr << "host = " << host << ", port = " << port << "\n";
sock = socket(AF_INET, SOCK_STREAM, 0);
hp = gethostbyname(host.c_str());
if (hp==NULL) {
#if defined(_WIN32) || defined(_WIN64)
fprintf(stderr, "gethostbyname failed\n");
#else
herror("gethostbyname failed");
#endif
exit(1);
}
memset(&server, '\0', sizeof(server));
memcpy((char *)&server.sin_addr, hp->h_addr, hp->h_length);
server.sin_family = hp->h_addrtype;
server.sin_port = htons(port);
int errors = 0;
while (connect(sock, (struct sockaddr *)&server, sizeof(server)) < 0) {
//std::cerr << "Error: connect()\n";
sleep(1);
errors++;
if (errors > 5) return false;
}
return true;
}
LMResult LanguageModelRemote::GetValue(const std::vector<const Word*> &contextFactor, State* finalState) const
{
LMResult ret;
ret.unknown = false;
size_t count = contextFactor.size();
if (count == 0) {
if (finalState) *finalState = NULL;
ret.score = 0.0;
return ret;
}
//std::cerr << "contextFactor.size() = " << count << "\n";
size_t max = m_nGramOrder;
const FactorType factor = GetFactorType();
if (max > count) max = count;
Cache* cur = &m_cache;
int pc = static_cast<int>(count) - 1;
for (int i = 0; i < pc; ++i) {
const Factor* f = contextFactor[i]->GetFactor(factor);
cur = &cur->tree[f ? f : BOS];
}
const Factor* event_word = contextFactor[pc]->GetFactor(factor);
cur = &cur->tree[event_word ? event_word : EOS];
if (cur->prob) {
if (finalState) *finalState = cur->boState;
ret.score = cur->prob;
return ret;
}
cur->boState = *reinterpret_cast<const State*>(&m_curId);
++m_curId;
util::StringStream os;
os << "prob ";
if (event_word == NULL) {
os << "</s>";
} else {
os << event_word->GetString();
}
for (size_t i=1; i<max; i++) {
const Factor* f = contextFactor[count-1-i]->GetFactor(factor);
if (f == NULL) {
os << " <s>";
} else {
os << ' ' << f->GetString();
}
}
os << "\n";
write(sock, os.str().c_str(), os.str().size());
char res[6];
int r = read(sock, res, 6);
int errors = 0;
int cnt = 0;
while (1) {
if (r < 0) {
errors++;
sleep(1);
//std::cerr << "Error: read()\n";
if (errors > 5) exit(1);
} else if (r==0 || res[cnt] == '\n') {
break;
} else {
cnt += r;
if (cnt==6) break;
read(sock, &res[cnt], 6-cnt);
}
}
cur->prob = FloorScore(TransformLMScore(*reinterpret_cast<float*>(res)));
if (finalState) {
*finalState = cur->boState;
}
ret.score = cur->prob;
return ret;
}
LanguageModelRemote::~LanguageModelRemote()
{
// Step 8 When finished send all lingering transmissions and close the connection
close(sock);
}
}
|