List of itemSimilarity() Examples

Examples of itemSimilarity()

org.apache.mahout.cf.taste.impl.similarity.GenericItemSimilarity.itemSimilarity()

Returns the similarity between two items. Note that similarity is assumed to be symmetric, that itemSimilarity(item1, item2) == itemSimilarity(item2, item1), and that itemSimilarity(item1, item1) == 1.0 for all items.
@param itemID1 first item @param itemID2 second item @return similarity between the two
org.apache.mahout.cf.taste.similarity.ItemSimilarity.itemSimilarity()

Returns the degree of similarity, of two items, based on the preferences that users have expressed for the items.
@param itemID1 first item ID @param itemID2 second item ID @return similarity between the items, in [-1,1] @throws TasteException if an error occurs while accessing the data

Examples of org.apache.mahout.cf.taste.similarity.ItemSimilarity.itemSimilarity()

    writeLines(testFile, changedData);


    /* we shouldn't see any changes in the data as we have not yet refreshed */
    assertEquals(0.5, similarity.itemSimilarity(1L, 7L), EPSILON);
    assertEquals(0.5, similarity.itemSimilarity(7L, 1L), EPSILON);
    assertTrue(Double.isNaN(similarity.itemSimilarity(7L, 8L)));
  }


  @Test
  public void testRefreshAfterFileUpdate() throws Exception {
    ItemSimilarity similarity = new FileItemSimilarity(testFile, 0L);

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