public void testNoRefreshAfterFileUpdate() {
ItemSimilarity similarity = new FileItemSimilarity(testFile, 0L);
/// call a method to make sure the original file is loaded
similarity.itemSimilarity(1L, 5L);
/// change the underlying file,
/// we have to wait at least a second to see the change in the file's lastModified timestamp
Thread.sleep(2000L);
writeLines(testFile, changedData);
/// we shouldn't see any changes in the data as we have not yet refreshed
Assert.AreEqual(0.5, similarity.itemSimilarity(1L, 7L), EPSILON);
Assert.AreEqual(0.5, similarity.itemSimilarity(7L, 1L), EPSILON);
Assert.True(Double.IsNaN(similarity.itemSimilarity(7L, 8L)));
}
public void testLoadFromFile() {
ItemSimilarity similarity = new FileItemSimilarity(testFile);
Assert.AreEqual(0.125, similarity.itemSimilarity(1L, 5L), EPSILON);
Assert.AreEqual(0.125, similarity.itemSimilarity(5L, 1L), EPSILON);
Assert.AreEqual(0.5, similarity.itemSimilarity(1L, 7L), EPSILON);
Assert.AreEqual(0.5, similarity.itemSimilarity(7L, 1L), EPSILON);
Assert.True(Double.IsNaN(similarity.itemSimilarity(7L, 8L)));
double[] valuesForOne = similarity.itemSimilarities(1L, new long[] { 5L, 7L });
Assert.NotNull(valuesForOne);
Assert.AreEqual(2, valuesForOne.Length);
Assert.AreEqual(0.125, valuesForOne[0], EPSILON);
Assert.AreEqual(0.5, valuesForOne[1], EPSILON);
}
public void testNoRefreshAfterFileUpdate()
{
ItemSimilarity similarity = new FileItemSimilarity(testFile, 0L);
/// call a method to make sure the original file is loaded
similarity.itemSimilarity(1L, 5L);
/// change the underlying file,
/// we have to wait at least a second to see the change in the file's lastModified timestamp
Thread.sleep(2000L);
writeLines(testFile, changedData);
/// we shouldn't see any changes in the data as we have not yet refreshed
Assert.AreEqual(0.5, similarity.itemSimilarity(1L, 7L), EPSILON);
Assert.AreEqual(0.5, similarity.itemSimilarity(7L, 1L), EPSILON);
Assert.True(Double.IsNaN(similarity.itemSimilarity(7L, 8L)));
}
public void testLoadFromFile()
{
ItemSimilarity similarity = new FileItemSimilarity(testFile);
Assert.AreEqual(0.125, similarity.itemSimilarity(1L, 5L), EPSILON);
Assert.AreEqual(0.125, similarity.itemSimilarity(5L, 1L), EPSILON);
Assert.AreEqual(0.5, similarity.itemSimilarity(1L, 7L), EPSILON);
Assert.AreEqual(0.5, similarity.itemSimilarity(7L, 1L), EPSILON);
Assert.True(Double.IsNaN(similarity.itemSimilarity(7L, 8L)));
double[] valuesForOne = similarity.itemSimilarities(1L, new long[] { 5L, 7L });
Assert.NotNull(valuesForOne);
Assert.AreEqual(2, valuesForOne.Length);
Assert.AreEqual(0.125, valuesForOne[0], EPSILON);
Assert.AreEqual(0.5, valuesForOne[1], EPSILON);
}
public void testToString()
{
ItemSimilarity similarity = new FileItemSimilarity(testFile);
Assert.True(!similarity.toString().isEmpty());
}
public void testToString() {
ItemSimilarity similarity = new FileItemSimilarity(testFile);
Assert.True(!similarity.toString().isEmpty());
}
