Add test of diversity with different min-groups settings

tests/search/diversity/diversity.rb

@@ -0,0 +1,72 @@
+# Copyright Vespa.ai. All rights reserved.
+require 'indexed_only_search_test'
+require 'doc_generator'
+
+class DiversityMinGroups < IndexedOnlySearchTest
+
+  def setup
+    set_owner('hmusum')
+    @docs = 20
+  end
+
+  def test_diversity_min_groups
+    deploy_app(SearchApp.new.sd(selfdir+"music.sd"))
+    start
+    feed_docs
+    wait_for_hitcount("query=sddocname:music", @docs)
+
+    # All docs match this query, but 1 doc has higher relevancy, see feed_docs()
+    puts "Query: 'rock'"
+    @expected_relevancy_best_doc = 1000.3818623835995
+    @expected_relevancy_rest = 1000.16343879032
+    @expected_relevancy_no_second_phase = 0.16343879032006287
+
+    assert_hitcount("query=rock", @docs)
+    assert_relevancy("query=rock&ranking=base", @expected_relevancy_best_doc, 0)
+    assert_relevancy("query=rock&ranking=diversity_min_groups_5", @expected_relevancy_best_doc, 0)
+    # Should get 1 hit that is doc 0, rest should have gone through second phase
+    check_relevancy("query=rock&ranking=diversity_min_groups_5", @expected_relevancy_rest, {0 => @expected_relevancy_best_doc})
+  end
+
+  def feed_docs
+    @docs.times.each { |i|
+      doc = Document.new('music', "id:test:music::#{i}")
+      if i == 0
+        doc.add_field('genre', 'rock')
+        doc.add_field('artist', 'The Clash')
+        doc.add_field('title', 'Rock the Casbah')
+      else
+        doc.add_field('genre', 'alternative')
+        doc.add_field('artist', 'Smashing Pumpkins')
+        doc.add_field('title', 'Cherub Rock')
+      end
+      vespa.document_api_v1.put(doc, :brief => true)
+    }
+  end
+
+  def check_relevancy(query, default_relevance, hit_number_to_relevance_mapping, hits=10)
+    result = search(query)
+    assert_equal(hits, result.hit.length)
+    hits.times.each { |i|
+      puts "hit #{i} relevance = #{relevance(result, i)}"
+    }
+    puts "---\n"
+    hits.times.each { |i|
+      expected_relevance = hit_number_to_relevance_mapping[i]
+      expected_relevance = default_relevance unless expected_relevance
+      hit = result.hit[i]
+      relevance = relevance(result, i)
+      assert_approx(expected_relevance, relevance, 0.01, "expected: #{expected_relevance}, got #{relevance} for hit #{i}: #{hit}")
+    }
+  end
+
+  def relevance(result, index)
+    result.hit[index].field['relevancy'].to_f
+  end
+
+  def teardown
+    stop
+  end
+
+end
+

tests/search/diversity/music.sd

@@ -0,0 +1,44 @@
+# Copyright Vespa.ai. All rights reserved.
+
+schema music {
+
+  document music {
+
+    field title type string {
+      indexing: index | summary
+    }
+
+    field artist type string {
+      indexing: index | summary
+    }
+
+    field genre type string {
+      indexing: summary | attribute
+    }
+
+  }
+
+  fieldset default {
+    fields: title, artist
+  }
+
+  rank-profile base inherits default {
+    first-phase {
+        expression: nativeRank(artist) + nativeRank(title)
+    }
+
+    second-phase {
+        expression: firstPhase() + 1000
+        rerank-count: 100
+    }
+  }
+
+  rank-profile diversity_min_groups_5 inherits base {
+    diversity {
+        attribute: genre
+        min-groups: 5
+    }
+  }
+
+}
+