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// Copyright 2020 Oath Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include <vespa/eval/tensor/dense/typed_cells.h>
#include <vespa/searchlib/tensor/doc_vector_access.h>
#include <vespa/searchlib/tensor/hnsw_index.h>
#include <vespa/vespalib/gtest/gtest.h>
#include <vector>
#include <vespa/log/log.h>
LOG_SETUP("hnsw_index_test");
using namespace search::tensor;
template <typename FloatType>
class MyDocVectorAccess : public DocVectorAccess {
private:
using Vector = std::vector<FloatType>;
using ArrayRef = vespalib::ConstArrayRef<FloatType>;
std::vector<Vector> _vectors;
public:
MyDocVectorAccess() : _vectors() {}
MyDocVectorAccess& set(uint32_t docid, const Vector& vec) {
if (docid >= _vectors.size()) {
_vectors.resize(docid + 1);
}
_vectors[docid] = vec;
return *this;
}
vespalib::tensor::TypedCells get_vector(uint32_t docid) const override {
ArrayRef ref(_vectors[docid]);
return vespalib::tensor::TypedCells(ref);
}
};
class HnswIndexTest : public ::testing::Test {
public:
MyDocVectorAccess<float> vectors;
HnswIndex<float> index;
HnswIndexTest()
: vectors(),
index(vectors, HnswIndexBase::Config(2, 0, 4))
{
}
void expect_level_0(uint32_t docid, const HnswNode::LinkArray& exp_links) {
auto node = index.get_node(docid);
ASSERT_EQ(1, node.size());
EXPECT_EQ(exp_links, node.level(0));
}
};
TEST_F(HnswIndexTest, 2d_vectors_inserted_in_level_0_graph_with_simple_select_neighbors)
{
vectors.set(1, {2, 2}).set(2, {3, 2}).set(3, {2, 3})
.set(4, {1, 2}).set(5, {5, 3}).set(6, {6, 2});
index.add_document(1);
expect_level_0(1, {});
index.add_document(2);
expect_level_0(1, {2});
expect_level_0(2, {1});
index.add_document(3);
expect_level_0(1, {2, 3});
expect_level_0(2, {1, 3});
expect_level_0(3, {1, 2});
index.add_document(4);
expect_level_0(1, {2, 3, 4});
expect_level_0(2, {1, 3});
expect_level_0(3, {1, 2, 4});
expect_level_0(4, {1, 3});
index.add_document(5);
expect_level_0(1, {2, 3, 4});
expect_level_0(2, {1, 3, 5});
expect_level_0(3, {1, 2, 4, 5});
expect_level_0(4, {1, 3});
expect_level_0(5, {2, 3});
index.add_document(6);
expect_level_0(1, {2, 3, 4});
expect_level_0(2, {1, 3, 5, 6});
expect_level_0(3, {1, 2, 4, 5});
expect_level_0(4, {1, 3});
expect_level_0(5, {2, 3, 6});
expect_level_0(6, {2, 5});
}
GTEST_MAIN_RUN_ALL_TESTS()
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