Package: similari-trackers-rs
SimilariNewer versions (renamed):Older versions::star: Star us on GitHub — it motivates us a lot!Similari is a Rust framework with Python bindings that helps build sophisticated tracking systems. With Similari one
can develop highly efficient parallelizedSORT,DeepSORT, and
other sophisticated single observer (e.g. Cam) or multi-observer tracking engines.IntroductionThe primary purpose of Similari is to provide means to build sophisticated in-memory multiple object tracking engines.The framework helps build various kinds of tracking and similarity search engines - the simplest one that holds
vector features and allows comparing new vectors against the ones kept in the database. More sophisticated engines
operate over tracks - a series of observations for the same feature collected during the lifecycle. Such systems are
often used in video processing or other systems where the observer receives fuzzy or changing observation results.Out-of-The-Box StuffSimilari is a framework to build custom trackers, however it provides certain algorithms as an end-user functionality:Bounding Box Kalman filter, that predicts rectangular bounding boxes axis-aligned to scene, supports the oriented (rotated)
bounding boxes as well.2D Point Kalman filter, that predicts 2D point motion.2D Point Vector Kalman filter, that predicts the vector of independent 2D points motion (used in the Keypoint Tracker).Bounding box clipping, that allows calculating the area of intersection for axis-aligned and oriented (rotated)
bounding boxes.Non-Maximum Suppression (NMS)- filters rectangular bounding boxes co-axial to scene, and supports the oriented
bounding boxes.SORT trackingalgorithm (axis-aligned and oriented boxes are supported) - IoU and Mahalanobis distances are
supported.Batch SORT trackingalgorithm (axis-aligned and oriented boxes are supported) - IoU and Mahalanobis distances are
supported. Batch tracker allows passing multiple scenes to tracker in a single batch and get them back. If the platform
supports batching (like Nvidia DeepStream or Intel DL Streamer) the batch tracker is more beneficial to use.VisualSORT tracking- a DeepSORT-like algorithm (axis-aligned and oriented boxes are supported) - IoU and
Mahalanobis distances are supported for positional tracking, euclidean, cosine distances are used for visual tracking on
feature vectors.Batch VisualSORT- batched VisualSORT flavor;Applicability NotesAlthough Similari allows building various tracking and similarity engines, there are competitive tools that sometimes
may fit better. The section will explain where it is applicable and what alternatives exist.Similari fits best for the tracking tasks where objects are described by multiple observations for a certain feature
class, not a single feature vector. Also, their behavior is dynamic - you remove them from the index or modify them as
often as add new ones. This is a very important point - it is less efficient than tools that work with growing or static
object spaces.Fit: track the person across the room: person ReID, age/gender, and face features are collected multiple times during
the tracking and used to merge tracks or provide aggregated results at the end of the track;Not fit: plagiarism database, when a single document is described by a number (or just one) constant ReID vectors,
documents are added but not removed. The task is to find the top X most similar documents to a checked.If your task looks likeNot fit, can use Similari, but you're probably looking forHNSWorNMSimplementations:HNSW Rust -LinkHNSW C/Python -linkNMSLib -linkSimilari objects support following features:Track lifecycle- the object is represented by its lifecycle (track) - it appears, evolves, and disappears. During
its lifetime object evolves according to its behavioral properties (attributes, and feature observations).Observations- Similari assumes that an object is observed by an observer entity that collects its features
(uniform vectors) and custom observation attributes (like GPS or screen box position)multiple times. Those
features are presented by vectors of float numbers and observation attributes. When the observation happened, the
track is updated with gathered features. Future observations are used to find similar tracks in the index and merge them.Track Attributes- Arbitrary attributes describe additional track properties aside from feature observations.
Track attributes is crucial part when you are comparing objects in the wild, because there may be attributes
disposition when objects are incompatible, likeanimal_typethat prohibits you from comparingdogsandcatsbetween each other. Another popular use of attributes is a spatial or temporal characteristic of an object, e.g. objects
that are situated at distant locations at the same time cannot be compared. Attributes in Similari are dynamic and
evolve upon every feature observation addition and when objects are merged. They are used in both distance calculations
and compatibility guessing (which decreases compute space by skipping incompatible objects).If you plan to use Similari to search in a large index, consider object attributes to split the lookup space. If the
attributes of the two tracks are not compatible, their distance calculations are skipped.PerformanceThe Similari is fast. It is usually faster than trackers built with Python and NumPy.To run visual feature calculations performant the framework usesultraviolet-
the library for fast SIMD computations.Parallel computations are implemented with index sharding and parallel computations based on a dedicated thread workers
pool.Vector operations performance depends a lot on the optimization level defined for the build. On low or default
optimization levels Rust may not use f32 vectorization, so when running benchmarks take care of proper optimization
levels configured.Rust optimizationsUseRUSTFLAGS="-C target-cpu=native"to enable all cpu features like AVX, AVX2, etc. It is beneficial to ultraviolet.Alternatively you can add build instructions to.cargo/config:[build]
rustflags = "-C target-cpu=native"Take a look atbenchmarksfor numbers.Performance BenchmarksSome benchmarks numbers are presented here:BenchmarksYou can run your own benchmarks by:rustup default nightly
cargo benchApple Silicone Build NotesYou may need to add following lines into your~/.cargo/configto build the code on Apple Silicone:[build]
rustflags = "-C target-cpu=native"

# Apple Silicone fix
[target.aarch64-apple-darwin]
rustflags = [
    "-C", "link-arg=-undefined",
    "-C", "link-arg=dynamic_lookup",
]Python APIPython interface exposes ready-to-use functions and classes of Similari. As for now, the Python interface provides:the Kalman filter for axis-aligned and oriented (rotated) boxes prediction;the Kalman filter for 2D point motion prediction;the 2D Point Vector Kalman filter, that predicts the vector of independent 2D points motion (used in the Keypoint Tracker);NMS (Non-maximum suppression);the Sutherland-Hodgman clipping, intersection area for oriented (rotated) boxes;SORT with IoU and Mahalanobis metric;BatchSORT with IoU and Mahalanobis metric;VisualSORT - DeepSORT-like tracker with euclidean/cosine metric for visual features and IoU/Mahalanobis metric
for positional tracking (VisualSort).BatchVisualSORT - batched VisualSORT flavor;Python API classes and functions can be explored in the pythondocumentationand tinyexamplesprovided.There is alsoMOTChallengeevaluation kit provided which you can use to simply evaluate trackers
performance and metrics.Install Python API from PyPiPlease, keep in mind that the  PyPi package is built to conform broad range of platforms, so it may not be as fast as the one you build locally for your platform (see the following sections).Platforms:Linux: X86_64, ARM64, ARMv7;Windows: X86_64;MacOS: X86_64, ARM64.pip3 install similari-trackers-rsBuild Python API in DockerYou can build the wheel in the Docker and if you want to install it in the host system,
copy the resulting package to the host system as demonstrated by the following examples.Rust 1.67 Base ImageIf you use other rust libraries you may find it beneficial to build with base Rust
container (and Python 3.8):docker build -t similari-trackers-rs -f docker/rust_1.67/Dockerfile .

# optional: copy and install to host system
docker run --rm -it -v $(pwd)/distfiles:/tmp similari-trackers-rs cp -R /opt/dist /tmp
pip3 install --force-reinstall distfiles/dist/*.whlPython 3.8 Base ImagePython 3.8 is still a very frequently used. Here is how to build Similari with it:docker build -t similari-trackers-rs -f docker/python_3.8/Dockerfile .

# optional: copy and install to host system
docker run --rm -it -v $(pwd)/distfiles:/tmp similari-trackers-rs cp -R /opt/dist /tmp
pip3 install --force-reinstall distfiles/dist/*.whlPython 3.10 Base ImageIf you use the most recent Python environment, you can build with base Python container:docker build -t similari-trackers-rs -f docker/python_3.10/Dockerfile .

# optional: copy and install to host system
docker run --rm -it -v $(pwd)/distfiles:/tmp similari-trackers-rs cp -R /opt/dist /tmp
pip3 install --force-reinstall distfiles/dist/*.whlNOTE: If you are getting thepip3error like:ERROR: similari-trackers-rs-0.26.4-cp38-cp38-manylinux_2_28_x86_64.whl is not a supported wheel on this platform.It means that the Python version in the host system doesn't match to the one that is in the image used
to build the wheel.Build Python API in Host SystemLinux InstructionInstall up-to-date Rust toolkit:curl--proto'=https'--tlsv1.2-sSfhttps://sh.rustup.rs|shsource$HOME/.cargo/env
rustupupdateInstall build-essential toolsapt install build-essential -y.Install Python3 (>= 3.8) and the development files (python3-dev).Install Maturin:pip3 install --upgrade maturin~=0.15Not in VENV. Build the python module:RUSTFLAGS=" -C target-cpu=native -C opt-level=3" maturin build --release --out dist
pip3 install --force-reinstall dist/*.whlIn VENV. Build the python module:RUSTFLAGS=" -C target-cpu=native -C opt-level=3" maturin developUsage examples are located atpython.MOT Challenge Docker image for Similari trackers and conventional trackers ishere.
You can easily build all-in-one Docker image and try ours trackers.Manuals and ArticlesCollected articles about how the Similari can be used to solve specific problems.Medium.comIoU object trackerexample;Re-ID object trackerexample;SORT object trackerexample;Python SORT object trackerexample;Python Rotated SORT object trackerexample;Why You Need a High-Performance Tracking Systems For Multiple Object Tracking.Usage ExamplesTake a look at samples in the repo:simple.rs- an idea of simple usage.track_merging.rs- an idea of intra-cam track merging.incremental_track_build.rs- very simple feature-based tracker.simple_sort_iou_tracker.rs- SORT tracker (with Kalman filter, IoU).simple_sort_iou_tracker_oriented.rs- Oriented (rotated) SORT tracker
(with Kalman filter, IoU).simple_sort_maha_tracker.rs- SORT tracker (with Kalman filter, Mahalanobis).simple_sort_maha_tracker_oriented.rs- Oriented SORT tracker (with Kalman filter, Mahalanobis).middleware_sort_tracker.rs- SORT tracker (with Kalman filter, middleware implementation).