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#include <vector>
#ifdef _WIN32
#include <WinSock2.h>
#ifndef SHUT_RD
# define SHUT_RD SD_RECEIVE
#endif
#ifndef SHUT_WR
# define SHUT_WR SD_SEND
#endif
#ifndef SHUT_RDWR
# define SHUT_RDWR SD_BOTH
#endif
#else
#include <netdb.h>
#endif
#include "io_buf.h"
#include "cache.h"
#include "simple_label.h"
#include "network.h"
#include "reductions.h"
using namespace std;
using namespace LEARNER;
namespace SENDER {
struct sender {
io_buf* buf;
int sd;
vw* all;
example** delay_ring;
size_t sent_index;
size_t received_index;
};
void open_sockets(sender& s, string host)
{
s.sd = open_socket(host.c_str());
s.buf = new io_buf();
s.buf->files.push_back(s.sd);
}
void send_features(io_buf *b, example& ec, uint32_t mask)
{
// note: subtracting 1 b/c not sending constant
output_byte(*b,(unsigned char) (ec.indices.size()-1));
for (unsigned char* i = ec.indices.begin; i != ec.indices.end; i++) {
if (*i == constant_namespace)
continue;
output_features(*b, *i, ec.atomics[*i].begin, ec.atomics[*i].end, mask);
}
b->flush();
}
void receive_result(sender& s)
{
float res, weight;
get_prediction(s.sd,res,weight);
example* ec=s.delay_ring[s.received_index++ % s.all->p->ring_size];
label_data& ld = ec->l.simple;
ec->pred.scalar = res;
ec->loss = s.all->loss->getLoss(s.all->sd, ec->pred.scalar, ld.label) * ld.weight;
return_simple_example(*(s.all), NULL, *ec);
}
void learn(sender& s, learner& base, example& ec)
{
if (s.received_index + s.all->p->ring_size / 2 - 1 == s.sent_index)
receive_result(s);
s.all->set_minmax(s.all->sd, ec.l.simple.label);
s.all->p->lp.cache_label(&ec.l, *s.buf);//send label information.
cache_tag(*s.buf, ec.tag);
send_features(s.buf,ec, (uint32_t)s.all->parse_mask);
s.delay_ring[s.sent_index++ % s.all->p->ring_size] = &ec;
}
void finish_example(vw& all, sender&, example& ec)
{}
void end_examples(sender& s)
{
//close our outputs to signal finishing.
while (s.received_index != s.sent_index)
receive_result(s);
shutdown(s.buf->files[0],SHUT_WR);
}
void finish(sender& s)
{
s.buf->files.delete_v();
s.buf->space.delete_v();
free(s.delay_ring);
delete s.buf;
}
learner* setup(vw& all, po::variables_map& vm, vector<string> pairs)
{
sender* s = (sender*)calloc_or_die(1,sizeof(sender));
s->sd = -1;
if (vm.count("sendto"))
{
vector<string> hosts = vm["sendto"].as< vector<string> >();
open_sockets(*s, hosts[0]);
}
s->all = &all;
s->delay_ring = (example**) calloc_or_die(all.p->ring_size, sizeof(example*));
learner* l = new learner(s, 1);
l->set_learn<sender, learn>();
l->set_predict<sender, learn>();
l->set_finish<sender, finish>();
l->set_finish_example<sender, finish_example>();
l->set_end_examples<sender, end_examples>();
return l;
}
}
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