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#include <float.h>
#include <math.h>
#include <stdio.h>
#include "simple_label.h"
#include "cache.h"
#include "rand48.h"
#include "vw.h"
#include "accumulate.h"
using namespace std;
char* bufread_simple_label(shared_data* sd, label_data* ld, char* c)
{
ld->label = *(float *)c;
c += sizeof(ld->label);
if (sd->binary_label && fabs(ld->label) != 1.f && ld->label != FLT_MAX)
cout << "You are using a label not -1 or 1 with a loss function expecting that!" << endl;
ld->weight = *(float *)c;
c += sizeof(ld->weight);
ld->initial = *(float *)c;
c += sizeof(ld->initial);
return c;
}
size_t read_cached_simple_label(shared_data* sd, void* v, io_buf& cache)
{
label_data* ld = (label_data*) v;
char *c;
size_t total = sizeof(ld->label)+sizeof(ld->weight)+sizeof(ld->initial);
if (buf_read(cache, c, total) < total)
return 0;
c = bufread_simple_label(sd, ld,c);
return total;
}
float get_weight(void* v)
{
label_data* ld = (label_data*) v;
return ld->weight;
}
float get_initial(void* v)
{
label_data* ld = (label_data*) v;
return ld->initial;
}
char* bufcache_simple_label(label_data* ld, char* c)
{
*(float *)c = ld->label;
c += sizeof(ld->label);
*(float *)c = ld->weight;
c += sizeof(ld->weight);
*(float *)c = ld->initial;
c += sizeof(ld->initial);
return c;
}
void cache_simple_label(void* v, io_buf& cache)
{
char *c;
label_data* ld = (label_data*) v;
buf_write(cache, c, sizeof(ld->label)+sizeof(ld->weight)+sizeof(ld->initial));
c = bufcache_simple_label(ld,c);
}
void default_simple_label(void* v)
{
label_data* ld = (label_data*) v;
ld->label = FLT_MAX;
ld->weight = 1.;
ld->initial = 0.;
}
void delete_simple_label(void* v)
{
}
void parse_simple_label(parser* p, shared_data* sd, void* v, v_array<substring>& words)
{
label_data* ld = (label_data*)v;
switch(words.size()) {
case 0:
break;
case 1:
ld->label = float_of_substring(words[0]);
break;
case 2:
ld->label = float_of_substring(words[0]);
ld->weight = float_of_substring(words[1]);
break;
case 3:
ld->label = float_of_substring(words[0]);
ld->weight = float_of_substring(words[1]);
ld->initial = float_of_substring(words[2]);
break;
default:
cerr << "malformed example!\n";
cerr << "words.size() = " << words.size() << endl;
}
if (words.size() > 0 && sd->binary_label && fabs(ld->label) != 1.f)
cout << "You are using a label not -1 or 1 with a loss function expecting that!" << endl;
}
float get_active_coin_bias(float k, float l, float g, float c0)
{
float b,sb,rs,sl;
b=(float)(c0*(log(k+1.)+0.0001)/(k+0.0001));
sb=sqrt(b);
if (l > 1.0) { l = 1.0; } else if (l < 0.0) { l = 0.0; } //loss should be in [0,1]
sl=sqrt(l)+sqrt(l+g);
if (g<=sb*sl+b)
return 1;
rs = (sl+sqrt(sl*sl+4*g))/(2*g);
return b*rs*rs;
}
float query_decision(vw& all, example& ec, float k)
{
float bias, avg_loss, weighted_queries;
if (k<=1.)
bias=1.;
else{
weighted_queries = (float)(all.initial_t + all.sd->weighted_examples - all.sd->weighted_unlabeled_examples);
avg_loss = (float)(all.sd->sum_loss/k + sqrt((1.+0.5*log(k))/(weighted_queries+0.0001)));
bias = get_active_coin_bias(k, avg_loss, ec.revert_weight/k, all.active_c0);
}
if(frand48()<bias)
return 1.f/bias;
else
return -1.;
}
void print_update(vw& all, example& ec)
{
if (all.sd->weighted_examples >= all.sd->dump_interval && !all.quiet && !all.bfgs)
{
label_data* ld = (label_data*) ec.ld;
char label_buf[32];
if (ld->label == FLT_MAX)
strcpy(label_buf," unknown");
else
sprintf(label_buf,"%8.4f",ld->label);
if(!all.holdout_set_off && all.current_pass >= 1){
if(all.sd->holdout_sum_loss == 0. && all.sd->weighted_holdout_examples == 0.)
fprintf(stderr, " unknown ");
else
fprintf(stderr, "%-10.6f " , all.sd->holdout_sum_loss/all.sd->weighted_holdout_examples);
if(all.sd->holdout_sum_loss_since_last_dump == 0. && all.sd->weighted_holdout_examples_since_last_dump == 0.)
fprintf(stderr, " unknown ");
else
fprintf(stderr, "%-10.6f " , all.sd->holdout_sum_loss_since_last_dump/all.sd->weighted_holdout_examples_since_last_dump);
fprintf(stderr, "%10ld %11.1f %s %8.4f %8lu h\n",
(long int)all.sd->example_number,
all.sd->weighted_examples,
label_buf,
ec.final_prediction,
(long unsigned int)ec.num_features);
all.sd->weighted_holdout_examples_since_last_dump = 0.;
all.sd->holdout_sum_loss_since_last_dump = 0.0;
}
else
fprintf(stderr, "%-10.6f %-10.6f %10ld %11.1f %s %8.4f %8lu\n",
all.sd->sum_loss/all.sd->weighted_examples,
all.sd->sum_loss_since_last_dump / (all.sd->weighted_examples - all.sd->old_weighted_examples),
(long int)all.sd->example_number,
all.sd->weighted_examples,
label_buf,
ec.final_prediction,
(long unsigned int)ec.num_features);
all.sd->sum_loss_since_last_dump = 0.0;
all.sd->old_weighted_examples = all.sd->weighted_examples;
VW::update_dump_interval(all);
fflush(stderr);
}
}
void output_and_account_example(vw& all, example& ec)
{
label_data* ld = (label_data*)ec.ld;
if(ec.test_only)
{
all.sd->weighted_holdout_examples += ec.global_weight;//test weight seen
all.sd->weighted_holdout_examples_since_last_dump += ec.global_weight;
all.sd->weighted_holdout_examples_since_last_pass += ec.global_weight;
all.sd->holdout_sum_loss += ec.loss;
all.sd->holdout_sum_loss_since_last_dump += ec.loss;
all.sd->holdout_sum_loss_since_last_pass += ec.loss;//since last pass
}
else
{
if (ld->label != FLT_MAX)
all.sd->weighted_labels += ld->label * ld->weight;
all.sd->weighted_examples += ld->weight;
all.sd->sum_loss += ec.loss;
all.sd->sum_loss_since_last_dump += ec.loss;
all.sd->total_features += ec.num_features;
all.sd->example_number++;
}
all.print(all.raw_prediction, ec.partial_prediction, -1, ec.tag);
float ai=-1;
if(all.active && ld->label == FLT_MAX)
ai=query_decision(all, ec, (float)all.sd->weighted_unlabeled_examples);
all.sd->weighted_unlabeled_examples += ld->label == FLT_MAX ? ld->weight : 0;
for (size_t i = 0; i<all.final_prediction_sink.size(); i++)
{
int f = (int)all.final_prediction_sink[i];
if(all.active)
active_print_result(f, ec.final_prediction, ai, ec.tag);
else if (all.lda > 0)
print_lda_result(all, f,ec.topic_predictions.begin,0.,ec.tag);
else
all.print(f, ec.final_prediction, 0, ec.tag);
}
print_update(all, ec);
}
void return_simple_example(vw& all, void*, example& ec)
{
output_and_account_example(all, ec);
VW::finish_example(all,&ec);
}
bool summarize_holdout_set(vw& all, size_t& no_win_counter)
{
float thisLoss = (all.sd->weighted_holdout_examples_since_last_pass > 0) ? (float)(all.sd->holdout_sum_loss_since_last_pass / all.sd->weighted_holdout_examples_since_last_pass) : FLT_MAX;
if (all.span_server != "")
thisLoss = accumulate_scalar(all, all.span_server, thisLoss);
all.sd->weighted_holdout_examples_since_last_pass = 0;
all.sd->holdout_sum_loss_since_last_pass = 0;
if (thisLoss < all.sd->holdout_best_loss) {
all.sd->holdout_best_loss = thisLoss;
all.sd->holdout_best_pass = all.current_pass;
no_win_counter = 0;
return true;
}
no_win_counter++;
return false;
}
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