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Constructor from PMF

release/4.3a0
Frank Dellaert 2022-01-15 08:15:46 -05:00
parent 1000825b03
commit be5aa56df7
4 changed files with 22 additions and 10 deletions
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14
gtsam/discrete/DiscretePrior.h
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@ -48,17 +48,17 @@ class GTSAM_EXPORT DiscretePrior : public DiscreteConditional {
DiscretePrior(const Signature& s) : Base(s) {}
/**
* Construct from key and a Signature::Table specifying the
* conditional probability table (CPT).
* Construct from key and a vector of floats specifying the probability mass
* function (PMF).
*
* Example: DiscretePrior P(D, table);
* Example: DiscretePrior P(D, {0.4, 0.6});
*/
DiscretePrior(const DiscreteKey& key, const Signature::Table& table)
: Base(Signature(key, {}, table)) {}
DiscretePrior(const DiscreteKey& key, const std::vector<double>& spec)
: DiscretePrior(Signature(key, {}, Signature::Table{spec})) {}
/**
* Construct from key and a string specifying the conditional
* probability table (CPT).
* Construct from key and a string specifying the probability mass function
* (PMF).
*
* Example: DiscretePrior P(D, "9/1 2/8 3/7 1/9");
*/

1
gtsam/discrete/discrete.i
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@ -120,6 +120,7 @@ virtual class DiscretePrior : gtsam::DiscreteConditional {
DiscretePrior();
DiscretePrior(const gtsam::DecisionTreeFactor& f);
DiscretePrior(const gtsam::DiscreteKey& key, string spec);
DiscretePrior(const gtsam::DiscreteKey& key, std::vector<double> spec);
void print(string s = "Discrete Prior\n",
const gtsam::KeyFormatter& keyFormatter =
gtsam::DefaultKeyFormatter) const;

11
gtsam/discrete/tests/testDiscretePrior.cpp
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@ -27,12 +27,19 @@ static const DiscreteKey X(0, 2);
/* ************************************************************************* */
TEST(DiscretePrior, constructors) {
DecisionTreeFactor f(X, "0.4 0.6");
DiscretePrior expected(f);
DiscretePrior actual(X % "2/3");
EXPECT_LONGS_EQUAL(1, actual.nrFrontals());
EXPECT_LONGS_EQUAL(0, actual.nrParents());
DecisionTreeFactor f(X, "0.4 0.6");
DiscretePrior expected(f);
EXPECT(assert_equal(expected, actual, 1e-9));
const vector<double> pmf{0.4, 0.6};
DiscretePrior actual2(X, pmf);
EXPECT_LONGS_EQUAL(1, actual2.nrFrontals());
EXPECT_LONGS_EQUAL(0, actual2.nrParents());
EXPECT(assert_equal(expected, actual2, 1e-9));
}
/* ************************************************************************* */

6
python/gtsam/tests/test_DiscretePrior.py
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@ -25,12 +25,16 @@ class TestDiscretePrior(GtsamTestCase):
def test_constructor(self):
"""Test various constructors."""
actual = DiscretePrior(X, "2/3")
keys = DiscreteKeys()
keys.push_back(X)
f = DecisionTreeFactor(keys, "0.4 0.6")
expected = DiscretePrior(f)
actual = DiscretePrior(X, "2/3")
self.gtsamAssertEquals(actual, expected)
actual2 = DiscretePrior(X, [0.4, 0.6])
self.gtsamAssertEquals(actual2, expected)
def test_operator(self):
prior = DiscretePrior(X, "2/3")