Fast approximate KNN library, is one for the kd-tree implementation. You can use it to achieve the feature vector matching.

flann-1.2-src
.............\bin
.............\README
.............\doc
.............\...\manual.pdf
.............\src
.............\...\python
.............\...\......\setup.py
.............\...\......\CMakeLists.txt
.............\...\......\tests
.............\...\......\.....\test_autotune.py
.............\...\......\.....\test_flann2.py
.............\...\......\.....\test_flann.py
.............\...\......\.....\test_c.py
.............\...\......\.....\test.py
.............\...\......\flann
.............\...\......\pyflann
.............\...\......\.......\bindings
.............\...\......\.......\........\flann_ctypes.py
.............\...\......\.......\........\__init__.pyc
.............\...\......\.......\........\tests
.............\...\......\.......\........\.....\test_clustering.py
.............\...\......\.......\........\.....\memusage_clustering.py
.............\...\......\.......\........\.....\test_nn.py
.............\...\......\.......\........\.....\test_nn_index.py
.............\...\......\.......\........\.....\test_nn_autotune.py
.............\...\......\.......\........\.....\memusage_nn.py
.............\...\......\.......\........\flann_ctypes.pyc
.............\...\......\.......\........\__init__.py
.............\...\......\.......\exceptions.pyc
.............\...\......\.......\exceptions.py
.............\...\......\.......\util
.............\...\......\.......\....\weave_tools.py
.............\...\......\.......\....\__init__.pyc
.............\...\......\.......\....\weave_tools.pyc
.............\...\......\.......\....\__init__.py
.............\...\......\.......\__init__.pyc
.............\...\......\.......\command
.............\...\......\.......\.......\convert.py
.............\...\......\.......\.......\autotune.pyc
.............\...\......\.......\.......\run_test.py
.............\...\......\.......\.......\run_test.pyc
.............\...\......\.......\.......\autotune.py
.............\...\......\.......\.......\compute_gt.py
.............\...\......\.......\.......\sample_dataset.py
.............\...\......\.......\.......\__init__.pyc
.............\...\......\.......\.......\compute_nn.pyc
.............\...\......\.......\.......\compute_nn.py
.............\...\......\.......\.......\compute_gt.pyc
.............\...\......\.......\.......\__init__.py
.............\...\......\.......\.......\cluster.py
.............\...\......\.......\.......\generate_random.py
.............\...\......\.......\.......\cluster.pyc
.............\...\......\.......\__init__.py
.............\...\......\.......\io
.............\...\......\.......\..\dat_dataset.py
.............\...\......\.......\..\npy_dataset.py
.............\...\......\.......\..\dat_dataset.pyc
.............\...\......\.......\..\binary_dataset.pyc
.............\...\......\.......\..\binary_dataset.py
.............\...\......\.......\..\__init__.pyc
.............\...\......\.......\..\dataset.py
.............\...\......\.......\..\__init__.py
.............\...\......\.......\..\dataset.pyc
.............\...\CMakeLists.txt
.............\...\cpp
.............\...\...\algorithms
.............\...\...\..........\LinearSearch.h
.............\...\...\..........\KMeansTree.h
.............\...\...\..........\CompositeTree.h
.............\...\...\..........\dist.h
.............\...\...\..........\KDTree.h
.............\...\...\..........\NNIndex.cpp
.............\...\...\..........\NNIndex.h
.............\...\...\..........\dist.cpp
.............\...\...\CMakeLists.txt
.............\...\...\util
.............\...\...\....\Allocator.h
.............\...\...\....\Variant.h
.............\...\...\....\Random.h
.............\...\...\....\Logger.cpp
.............\...\...\....\Random.cpp
.............\...\...\....\ResultSet.h
.............\...\...\....\Timer.h
.............\...\...\....\Dataset.h
.............\...\...\....\Heap.h
.............\...\...\....\common.h
.............\...\...\....\Logger.h
.............\...\...\flann.h
.............\...\...\tests
.............\...\...\.....\CMakeLists.txt
.............\...\...\.....\flann_test.cc
.............\...\

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