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#include <iostream>
#include <vector>
#include <string>
#include <gtest/gtest.h>
#include "ccrp.h"
#include "sampler.h"
const size_t MAX_DOC_LEN_CHARS = 10000000;
using namespace std;
class CRPTest : public testing::Test {
public:
CRPTest() {}
protected:
virtual void SetUp() { }
virtual void TearDown() { }
MT19937 rng;
};
TEST_F(CRPTest, Dist) {
CCRP<string> crp(0.1, 5);
double un = 0.25;
int tt = 0;
tt += crp.increment("hi", un, &rng);
tt += crp.increment("foo", un, &rng);
tt += crp.increment("bar", un, &rng);
tt += crp.increment("bar", un, &rng);
tt += crp.increment("bar", un, &rng);
tt += crp.increment("bar", un, &rng);
tt += crp.increment("bar", un, &rng);
tt += crp.increment("bar", un, &rng);
tt += crp.increment("bar", un, &rng);
cout << "tt=" << tt << endl;
cout << crp << endl;
cout << " P(bar)=" << crp.prob("bar", un) << endl;
cout << " P(hi)=" << crp.prob("hi", un) << endl;
cout << " P(baz)=" << crp.prob("baz", un) << endl;
cout << " P(foo)=" << crp.prob("foo", un) << endl;
double x = crp.prob("bar", un) + crp.prob("hi", un) + crp.prob("baz", un) + crp.prob("foo", un);
cout << " tot=" << x << endl;
EXPECT_FLOAT_EQ(1.0, x);
tt += crp.decrement("hi", &rng);
tt += crp.decrement("bar", &rng);
cout << crp << endl;
tt += crp.decrement("bar", &rng);
cout << crp << endl;
cout << "tt=" << tt << endl;
}
TEST_F(CRPTest, Exchangability) {
double tot = 0;
double xt = 0;
CCRP<int> crp(0.5, 1.0);
int cust = 10;
vector<int> hist(cust + 1, 0);
for (int i = 0; i < cust; ++i) { crp.increment(1, 1.0, &rng); }
const int samples = 100000;
const bool simulate = true;
for (int k = 0; k < samples; ++k) {
if (!simulate) {
crp.clear();
for (int i = 0; i < cust; ++i) { crp.increment(1, 1.0, &rng); }
} else {
int da = rng.next() * cust;
bool a = rng.next() < 0.5;
if (a) {
for (int i = 0; i < da; ++i) { crp.increment(1, 1.0, &rng); }
for (int i = 0; i < da; ++i) { crp.decrement(1, &rng); }
xt += 1.0;
} else {
for (int i = 0; i < da; ++i) { crp.decrement(1, &rng); }
for (int i = 0; i < da; ++i) { crp.increment(1, 1.0, &rng); }
}
}
int c = crp.num_tables(1);
++hist[c];
tot += c;
}
cerr << "P(a) = " << (xt / samples) << endl;
cerr << "E[num tables] = " << (tot / samples) << endl;
double error = fabs((tot / samples) - 5.4);
cerr << " error = " << error << endl;
EXPECT_LT(error, 0.1); // it's possible for this to fail, but
// very, very unlikely
for (int i = 1; i <= cust; ++i)
cerr << i << ' ' << (hist[i]) << endl;
}
int main(int argc, char** argv) {
testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}
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