@Test
public void should_classify_instance_using_classifier() {
// Given
Double expectedPrediction1 = 2.5;
Double expectedPrediction2 = 12.8;
String regressorName = "TestLearner";
RegressionQuery query = new RegressionQuery(regressorName);
double[] features1 = new double[10];
double[] features2 = new double[10];
TridentTuple tuple1 = createMockedInstanceTuple(features1);
TridentTuple tuple2 = createMockedInstanceTuple(features2);
List<TridentTuple> tuples = Arrays.asList(tuple1, tuple2);
Regressor expectedRegressor = mock(Regressor.class);
given(expectedRegressor.predict(same(features1))).willReturn(expectedPrediction1);
given(expectedRegressor.predict(same(features2))).willReturn(expectedPrediction2);
List<List<Object>> expectedKeys = asList(asList((Object) regressorName));
MapState<Regressor> state = mock(MapState.class);
given(state.multiGet(expectedKeys)).willReturn(Arrays.asList(expectedRegressor));
// When
List<Double> actualPredictions = query.batchRetrieve(state, tuples);
assertEquals(2, actualPredictions.size());
assertEquals(expectedPrediction1, actualPredictions.get(0));
assertEquals(expectedPrediction2, actualPredictions.get(1));
}
@Test
public void should_classify_instance_without_classifier() {
// Given
String regressorName = "TestLearner";
RegressionQuery query = new RegressionQuery(regressorName);
TridentTuple tuple1 = mock(TridentTuple.class);
TridentTuple tuple2 = mock(TridentTuple.class);
List<TridentTuple> tuples = Arrays.asList(tuple1, tuple2);
List<List<Object>> expectedKeys = asList(asList((Object) regressorName));
MapState<Regressor> state = mock(MapState.class);
given(state.multiGet(expectedKeys)).willReturn(EMPTY_LIST);
// When
List<Double> actualPredictions = query.batchRetrieve(state, tuples);
assertEquals(2, actualPredictions.size());
assertNull(actualPredictions.get(0));
assertNull(actualPredictions.get(1));
}