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#include "lm/partial.hh"
#include "lm/left.hh"
#include "lm/model.hh"
#include "util/tokenize_piece.hh"
#define BOOST_TEST_MODULE PartialTest
#include <boost/test/unit_test.hpp>
#include <boost/test/floating_point_comparison.hpp>
namespace lm {
namespace ngram {
namespace {
const char *TestLocation() {
if (boost::unit_test::framework::master_test_suite().argc < 2) {
return "test.arpa";
}
return boost::unit_test::framework::master_test_suite().argv[1];
}
Config SilentConfig() {
Config config;
config.arpa_complain = Config::NONE;
config.messages = NULL;
return config;
}
struct ModelFixture {
ModelFixture() : m(TestLocation(), SilentConfig()) {}
RestProbingModel m;
};
BOOST_FIXTURE_TEST_SUITE(suite, ModelFixture)
BOOST_AUTO_TEST_CASE(SimpleBefore) {
Left left;
left.full = false;
left.length = 0;
Right right;
right.length = 0;
Right reveal;
reveal.length = 1;
WordIndex period = m.GetVocabulary().Index(".");
reveal.words[0] = period;
reveal.backoff[0] = -0.845098;
BOOST_CHECK_CLOSE(0.0, RevealBefore(m, reveal, 0, false, left, right), 0.001);
BOOST_CHECK_EQUAL(0, left.length);
BOOST_CHECK(!left.full);
BOOST_CHECK_EQUAL(1, right.length);
BOOST_CHECK_EQUAL(period, right.words[0]);
BOOST_CHECK_CLOSE(-0.845098, right.backoff[0], 0.001);
WordIndex more = m.GetVocabulary().Index("more");
reveal.words[1] = more;
reveal.backoff[1] = -0.4771212;
reveal.length = 2;
BOOST_CHECK_CLOSE(0.0, RevealBefore(m, reveal, 1, false, left, right), 0.001);
BOOST_CHECK_EQUAL(0, left.length);
BOOST_CHECK(!left.full);
BOOST_CHECK_EQUAL(2, right.length);
BOOST_CHECK_EQUAL(period, right.words[0]);
BOOST_CHECK_EQUAL(more, right.words[1]);
BOOST_CHECK_CLOSE(-0.845098, right.backoff[0], 0.001);
BOOST_CHECK_CLOSE(-0.4771212, right.backoff[1], 0.001);
}
BOOST_AUTO_TEST_CASE(AlsoWouldConsider) {
WordIndex would = m.GetVocabulary().Index("would");
WordIndex consider = m.GetVocabulary().Index("consider");
ChartState current;
current.left.length = 1;
current.left.pointers[0] = would;
current.left.full = false;
current.right.length = 1;
current.right.words[0] = would;
current.right.backoff[0] = -0.30103;
Left after;
after.full = false;
after.length = 1;
after.pointers[0] = consider;
// adjustment for would consider
BOOST_CHECK_CLOSE(-1.687872 - -0.2922095 - 0.30103, RevealAfter(m, current.left, current.right, after, 0), 0.001);
BOOST_CHECK_EQUAL(2, current.left.length);
BOOST_CHECK_EQUAL(would, current.left.pointers[0]);
BOOST_CHECK_EQUAL(false, current.left.full);
WordIndex also = m.GetVocabulary().Index("also");
Right before;
before.length = 1;
before.words[0] = also;
before.backoff[0] = -0.30103;
// r(would) = -0.2922095 [i would], r(would -> consider) = -1.988902 [b(would) + p(consider)]
// p(also -> would) = -2, p(also would -> consider) = -3
BOOST_CHECK_CLOSE(-2 + 0.2922095 -3 + 1.988902, RevealBefore(m, before, 0, false, current.left, current.right), 0.001);
BOOST_CHECK_EQUAL(0, current.left.length);
BOOST_CHECK(current.left.full);
BOOST_CHECK_EQUAL(2, current.right.length);
BOOST_CHECK_EQUAL(would, current.right.words[0]);
BOOST_CHECK_EQUAL(also, current.right.words[1]);
}
BOOST_AUTO_TEST_CASE(EndSentence) {
WordIndex loin = m.GetVocabulary().Index("loin");
WordIndex period = m.GetVocabulary().Index(".");
WordIndex eos = m.GetVocabulary().EndSentence();
ChartState between;
between.left.length = 1;
between.left.pointers[0] = eos;
between.left.full = true;
between.right.length = 0;
Right before;
before.words[0] = period;
before.words[1] = loin;
before.backoff[0] = -0.845098;
before.backoff[1] = 0.0;
before.length = 1;
BOOST_CHECK_CLOSE(-0.0410707, RevealBefore(m, before, 0, true, between.left, between.right), 0.001);
BOOST_CHECK_EQUAL(0, between.left.length);
}
float ScoreFragment(const RestProbingModel &model, unsigned int *begin, unsigned int *end, ChartState &out) {
RuleScore<RestProbingModel> scorer(model, out);
for (unsigned int *i = begin; i < end; ++i) {
scorer.Terminal(*i);
}
return scorer.Finish();
}
void CheckAdjustment(const RestProbingModel &model, float expect, const Right &before_in, bool before_full, ChartState between, const Left &after_in) {
Right before(before_in);
Left after(after_in);
after.full = false;
float got = 0.0;
for (unsigned int i = 1; i < 5; ++i) {
if (before_in.length >= i) {
before.length = i;
got += RevealBefore(model, before, i - 1, false, between.left, between.right);
}
if (after_in.length >= i) {
after.length = i;
got += RevealAfter(model, between.left, between.right, after, i - 1);
}
}
if (after_in.full) {
after.full = true;
got += RevealAfter(model, between.left, between.right, after, after.length);
}
if (before_full) {
got += RevealBefore(model, before, before.length, true, between.left, between.right);
}
// Sometimes they're zero and BOOST_CHECK_CLOSE fails for this.
BOOST_CHECK(fabs(expect - got) < 0.001);
}
void FullDivide(const RestProbingModel &model, StringPiece str) {
std::vector<WordIndex> indices;
for (util::TokenIter<util::SingleCharacter, true> i(str, ' '); i; ++i) {
indices.push_back(model.GetVocabulary().Index(*i));
}
ChartState full_state;
float full = ScoreFragment(model, &indices.front(), &indices.back() + 1, full_state);
ChartState before_state;
before_state.left.full = false;
RuleScore<RestProbingModel> before_scorer(model, before_state);
float before_score = 0.0;
for (unsigned int before = 0; before < indices.size(); ++before) {
for (unsigned int after = before; after <= indices.size(); ++after) {
ChartState after_state, between_state;
float after_score = ScoreFragment(model, &indices.front() + after, &indices.front() + indices.size(), after_state);
float between_score = ScoreFragment(model, &indices.front() + before, &indices.front() + after, between_state);
CheckAdjustment(model, full - before_score - after_score - between_score, before_state.right, before_state.left.full, between_state, after_state.left);
}
before_scorer.Terminal(indices[before]);
before_score = before_scorer.Finish();
}
}
BOOST_AUTO_TEST_CASE(Strings) {
FullDivide(m, "also would consider");
FullDivide(m, "looking on a little more loin . </s>");
FullDivide(m, "in biarritz watching considering looking . on a little more loin also would consider higher to look good unknown the screening foo bar , unknown however unknown </s>");
}
BOOST_AUTO_TEST_SUITE_END()
} // namespace
} // namespace ngram
} // namespace lm
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