2.2.0 -> 2.3.0
        - 2.3.0 is a devel version for 2.4.0 release. Unstable and experimental features are welcomed in this version.

2.1.1 -> 2.2.0
        - This is NNStreamer 2.2.0 Tizen 7.0 M2 release.

        - NNStreamer-Edge.
                - Edge-AI (Among-Device AI) implementation is moved to nnstreamer-edge so that non-nnstreamer/gstreamer systems can connect to nnstreamer pipelines.
                - NNStreamer-Edge provides inter-pipeline stream connections with various protocols transparently.
                - NNStreamer-Edge does not depend on gstreamer/nnstreamer; thus, non-gstreamer systems may connect to nnstreamer/gstreamer pipelines via nnstreamer-edge.
                - The "MQTT-Hybrid" protocol for high bandwidth communication w/ mqtt features included.

        - ML-Service API phase 2 is completed and released via api.git

        - New Subplugins
                - tensor_filter / DeepViewRT (NXP)
                - tensor_filter / MXNet
                - tensor_filter / tensorflow2-lite-custom (allow to designate user-supplied tf2-lite binaries)

        - Major features
                - tensor-query-client, tensor-query-serversrc/sink use nnstreamer-edge. Protocols are handled at nnstreamer-edge and it now support aitt as one of its backends.
                - Float16 (FP16) tensor stream support.
                - Rank limit of tensor stream increased: 4 --> 8 (experimental. with known issues)
                - Error messages, exception handling, and documentations are improved for application / pipeline writers.

        - Minor features
                - Added several workarounds for glitches of Qualcomm-SNPE's libraries.
                - Support additional .ini file for subplugin configuration. Required by clients who want to separate permissions for controlling user-installable subplugins and system-installable core files.
                - Ability to run multiple instances of unit tests in a single machine.
                - Add gcc >= 11 support
                - Fixed multithreading error in tensor_filter::python
                - Python2 dropped. Only Python3 is supported.
                - Refactored to increase SAM score (architecture quality assessment).
                - Query, GRPC: added minor features requested by users.
                - A lot of test cases and fixes introduced.
                - Ubuntu 22.04 published.
                - Python >= 3.10 support.
                - Tensor-decoder::bounding-box. ssd-mobilenet v3 support

        - Experimental features
                - edgesrc, edgesink. stream pub/sub elements based on nnstreamer-edge

        - Known issues
                - Multithreading errors in tensor_decoder::python and tensor_converter::python
                - FP16 in x64/x86 is not tested. (tested in armv7l/aarch64 only)
                - Rank > 4 support is not activated by default. Dimension properties of GSTCAP is not fully backward compatible (to be fixed).

2.1.0 -> 2.1.1
        - Tizen 7.0 M1 RCx preparation and NNStreamer Mini Summit 2022-04 release.

        - NNStreamer-Edge refactoring (module for Among-Device AI (a.k.a. Edge-AI))
                - Ongoing effort of nnstreamer-edge separation from nnstreamer.
                - In the future, nnstreamer-edge will provide among-device AI functions and nnstreamer will provide gstreamer plugins for such functions. Non-gstreamer systems may connect to nnstreamer-edge based pipelines without gstreamer as clients.
                - NNStreamer-Edge will be using AITT as its default backend, leaving protocol issues to AITT.
                - In the future, nnstreamer-edge will be compatible with non-Linux ultra-lightweight systems (e.g., Tizen-RT)

        - ML-Service API preparation is going on at api.git.

        - Major features
                - MQTT timestamping w/ NTP. (later will be migrated to nnstreamer-edge & aitt)
                - Query (later will be migrated to nnstreamer-edge & aitt): robustness support, mqtt-hybrid protocol, performance fixes for multi-clients.
                - More coverage for SNPE support: quantized model support, SNPE dimension bug workaround, fixes from/for production team.
                - Flexible tensor support w/ decoder, converter, flatbuffer.

        - Minor features
                - MQTT unittest basis, generic stream support, android support, timeout handling, ... (and many!)
                - Utility functions exported for plugin writers.
                - Tensorflow-lite delegation refactored for generality: may use XNNPACK more easily.
                - Tensorflow-lite multi-lib support.
                - PyTorch: support complex output tensor formats.
                - NNStreamer multi-lib support.
                - Decoder: boundingbox-yolov5
                - Filter: TRIx-Engine support. (NPUs of Samsung 2022 TV)
                - Docker support refactored and cleaned up.

        - Fixes
                - ARMNN build errors.
                - Android errors
                - Build errors with recent compiler updates. (gcc 11)
                - Fixes upstreamed from productions
                - Errors w/ library updates: Lua >= 5.3, GLib >= 2.68
                - Regression fixes: openvino, edgetpu, tensorrt
                - Memory leaks in C++ subplugin infra.

        - Known issues: PPA/Launchpad build broken!


2.0.0 -> 2.1.0
	- 2.1.0 is a devel version for 2.2.0 release, which is planned to be the LTS release of 2022.

1.7.2 -> 2.0.0
	- NNStreamer for Edge-AI
		- MQTT Pub/Sub streams can be synchronized with timestamp values
		- MQTT-Hybrid Pub/Sub protocol (send high-bandwidth data streams with HLS) is not included in 2.0. This feature will be enabled with 2.1+ releases.
		- Query (workload offloading) with TCP is included as an experimental feature. Query will be updated to use MQTT-Hybrid in future 2.1+ releases.

	- Stream data type redefined (backward compatible)
		- Flex-tensor and Sparse-tensor as a format of "other/tensors".
		- "other/tensor" is obsoleted (but will be kept supported for a while). Use "other/tensors,num_tensors=1" for single tensor stream.
		- The conventional tensor stream is "Static-tensor", which is the default format of "other/tensors".
		- Many elements of nnstreamer (including tensor-transform) support "Flex-tensor" as well as "Static-tensor".
		- The MIME type is "other/tensors,format={static, flexible, sparse}". If not specified, format is static.

	- Major features
		- Flexbuf supported as subplugins of converter and decoder.
		- LUA scripts supports as custom filters. (tensor-filter)
		- Debian pdebuild support (tested with Sid).

	- Minor features
		- Decoder/Bounding-boxes: more options for more diverse neural net settings.
		- SNAP+TF-Lite support.

	- Fixes
		- Tensor-filter: Python test fail, TVM bugs, code complexity, error messages, C++ exception handling
		- Tensor-crop: region setting, timestamp handling
		- Tizen/Family-Hub support.
		- Yocto, MacOS build errors.
		- ARMNN version updates.

1.7.1 -> 1.7.2
	- NNStreamer for Edge-AI project started.
		- Main features of 1.8.0 release and its immediate successors will be "Edge-AI", which allows distributed on-device AI inferences.

		- The new stream type, "Flex-Tensor", is introduced. Dimensions and types of tensor stream may vary per frame without cap-renegotiations.
			- Many nnstreamer's tensor-* elements support Flex-Tensor.
			- You may use tensor-converter to convert between flex-tensor and (static) tensor.
		- MQTT-SINK and MQTT-SRC elements are added for edge-AI systems with MQTT pub/sub streams.
			- MQTT streams support "ANY" capabilities.
			- Assuming that clocks of nodes are synchronized by NTP or other mechanisms, pipeline users may send timestamp related info via MQTT streams for multi-source synchronization.
		- Tensor-crop, a new nnstreamer-gstreamer element.
			- Basic feature only (cropping a tensor stream with information of another tensor stream)

	- Major features
		- GSTPipeline to PBTXT parser. You can use PBTXT-pipeline visualization tools with the parsed results.
		- FlexBuffers support.
		- TVM support

		- Tensor-IF with custom (user code plugged at run-time) conditions
		- Tensorflow-lite delegation designation is generalized.
		- Tensorflow2-lite XNNPACK delegation
		- NNTrainer-inference can be attached as a filter along with both API sets.
		- CAPI: updated documentation, added new enums for recent nnstreamer features, ...
		- API interface and implementation is separated to another git repository for better architecture.
		- Tensor-converter and Tensor-decoder support custom ops.
	- Minor features
		- Filter subplugin priority with ini file configuration.
		- Decoder/Bounding-Box improved: output tensor mapping, clamp bounding box locations, labeling issues, more options.
		- Decoder/Pose-Estimation improved: proper labeling.
		- Testcases added for gRPC, Android, Tensor-rate, ...
		- Refactoring (reduce complexity, remove duplicity, build options, ...)
		- Android build & release upgraded.
		- Converter usability upgrade: property to list subplugins, subplugin naming/install rules.
		- Pytorch: exception handling, Android build
		- gRPC: per-IDL packaging, interface updates, common-code revise, async mode, ...
		- Support Tensorflow 2.4 API (TF has broken backward compatibility again)
		- Tensor-transform: may operate on chosen tensor or channel only.
		- Tensor-transform: new option for normalization, "dc-average", is added.
	- Fixes
		- Android resource leak.
		- CAPI timing, header issues, seg-faults, memory leaks, ...
		- MacOS build errors.
		- TensorRT dependency bugs
		- Edge-TPU compatibility issues.
		- Unit test fixes (memory leaks, resource leaks, skip disabled features, ...)
		- Fixed reported issues (security, memory leaks, query-caps, ...)
	- Extra
		- Support for Python 2.x is dropped.
		- Automated doc-page generation with Hotdoc.
		- Android build now includes GST-Shark for performance profiling.

1.7.0 -> 1.7.1
	- Major features
		- Tensor-IF, a new element. It allows to create conditional branches based on tensor values.
		- Join, a new element. It merges output sinks from src pads of different elements with the same GST-Cap.
		- Tensor-rate, a new element. It allows throttling by generating QoS messages.
		- TensorRT support
		- TF1-lite and TF2-lite coexistance
		- TFx-lite NNAPI, GPU Delegation

	- Minor features
		- hw-accel options for tensor-filters are refactored
		- python3-embed enabled if python3 >= 3.8
		- Subplugin initialization optimization.
		- Docker scripts for Ubuntu developers.

	- Fixes
		- flatbuf dependency related with tensorflow-lite.
		- tensor-decoder configures framerate.
		- Dynamic dimension related API issues fixed.
		- MacOS, Yocto compatibility issues fixed. (A few Yocto known issues are still remaining.)
		- License mismatches resolved.
		- A few Test cases fixed.
		- Packaging issues fixed and style cleaned-up.

	- Extra
		- A lot of interesting sample applications are added.

1.6.0 -> 1.7.0
	- 1.7.0 is a devel version for 1.8.0 release, which is planned to be released synchronously with Tizen 6.5 releases.

1.5.3 -> 1.6.0
	- This is an official release for Tizen (6.0-M2) and Android developers. 1.6.y will be an LTS released with hotfixes in the future. We will move on to 1.7.0 after this release.

	- Tizen
		- Minor API and documentation updates
		- APIs for custom filters
		- C API latency optimization

	- Android
		- Java API latency optimization
		- nnfw (ONE) runtime support, custom-easy support.
		- Size optimization for products.

	- Major features
		- Plug-and-play sub-plugins for converters
		- Flatbuf --> NNStreamer converter
		- Protobuf --> NNStreamer converter
		- NNStreamer --> Flatbuf decoder
		- NNStreamer-Check utility for nnstreamer developers.
		- Decoders accept dynamic configurations.
		- Converters may emit multi-tensor streams.
		- NNShark subproject being integrated.
		- Tensorflow-lite 2 support

	- Minor features
		- Decoder subplugins w/ NEON support (depth/deeplab)
		- Unregister for custom-easy
		- Version fetching mechanisms.
		- More profiling capabilities.
		- Edge-AI examples and tests.
		- NNFW support for latest versions and more tensor types.
		- Product-wise size and build-time optimization.
		- Memory operation optimization.
		- More exception handling routines.
		- NEON and other CPU optimization techniques determined in run-time.

	- Fixes
		- Each instance of a custom filter or subplugin now have independent properties.
		- Decoder (image-seg), performance profiling property of filter
		- Transform negotiation errors, auto-fw filter, repo-sink, memory leaks
		- Build-deps cleaned up, Code-style check setup for C++,
		- Edge-TPU & Movidius subplugins tested and fixed.
		- Packaging issues, permission issues of sensor-src (Tizen)
		- Caffe2/Pytorch w/ Protobuf issues. Per-arch build and test issues.
		- EOS handling with APIs.
		- 0 SVACE and 0 Coverity issues.

1.5.2 -> 1.5.3
	- Mediapipe's graphs (NNStreamer pipeline equivalent) may be embedded as an element in NNStreamer pipeline
	- Qualcomm SNPE is supported (tensor-filter subplugin)
	- Verisilicon Vivante is supported (tensor-filter subplugin)
	- NNStreamer --> Protobuf decoder added.
	- New tensor-filter subplugin API "v1" released. (with v0 backward compatibility)
	- Tensor-filter now accepts C++ classes as a subplugin. Edge-TPU subplugin is re-written as an example.

	- Meson script re-worked.
	- Semantics of hardware-acceleration options for tensor-filter re-worked.
	- API/Android: nnfw-runtime (neurun) and SNPE support
	- API/Android: usability update.
	- API/Android: less invokation latency. (more optimization coming in next versions)
	- API/C: bugfixes, architectural upgrade, latency reduction.
	- tensor-filter has latency and throughput performance monitors.
	- tensor-sink is by default "sync=false". If appsink or tensor_sink in NNStreamer Pipeline API's pipeline has sync=true, emit warning messages.
	- Architectural updates: lower CC, less duplication, removed dependency cycles, less complicated #if statements and blocks.
	- Test suite updates: timeout handling, arm-arch error fixes, more test cases (supplying more negative cases), floating-point handling. and a lot more fixes and performance (latency) optimizations.
	- Build script updates: cleaned up dependencies and applied "feature" meson feature.
	- No more essential class in assert() for optimized binaries.
	- Much less assertions. Apply error-handling instead.
	- Daily build & test activated and published.
	- Rules & policy updated to comply with LF/AI.
	- Memory leaks removed: from demux, split, and a few more components.

	- Known bug: edge-TPU subplugin is not working in Tizen devices recently.

1.5.1 -> 1.5.2
	- Use gmodule instead of dlfcn for wider compatibility.
	- Get/Set properties for tensor-filters & C-API.
	- Support C++ class as tensor-filter subplugin. (experimental. C++ filter API is not yet fixed).
	- Highly configurable Android build. (for smaller app binaries).
	- Tensor-Filter auto framework detection mode (C-API support).
	- Linux Foundation AI compliance & Github ORG migration.
	- Upgraded Tensor-Filter API (C).
	- Applied portable logging mechanism.
	- Removed assertion failure for Tizen sensor errors.

	- Fixed issues found by static analyzers>
	- More error/exception handling for robustness.
	- Shows negative test case statistics.
	- OpenCV compatibility fixes.

1.5.0 -> 1.5.1
	- Filter subplugin APIs updated. Both V0 (minor changes to the conventional) and V1 (refactored API set) are supported.
	- Fixed major issue: now, each instance of a filter subplugin may have different property values.
	- Tizen 6.0 API ACR preparations.
	- Allow to build Single-API-only Android build for minimal ML-API usage.
	- Compatibility fix for GStreamer 1.16; Gst 1.16 has additional audit that blacklists behaviors of older NNStreamer.
	- Met Linux Foundation / AI requirements. (policy files)
	- Compatibility fix for LLVM/Clang and macOS.

	- Verisilicon-Vivante: Vivante is supported with private proprietary plugin. There was a minor infrastructural updates to assist it. We will work on opening this code; we may need assistance from Verisilicon. (they need to open source a few headers for general public to build Vivante-subplugin.)
	- TensorFlow-lite: recently added data types of Tensorflow-lite is supported.
	- OpenVINO/Caffe2/Tensorflow/NNFW/NCSDK2/ARMNN/Python: refactored hardware acceleration options.

	- Fixed issues found by static analyzers.
	- Added unit tests to widen coverages and to test exception cases.

1.4.0 -> 1.5.0
	- 1.5.0 is a devel version for 1.6.0 release.

1.3.1 -> 1.4.0
	- Stable release with API changes.
	- *Tensor-filter subplugin API has been updated.*
	- Stability fixes & added unit test cases.
	- C-API updates.

1.3.0 -> 1.3.1
	- 1.3.1 is a devel version for 1.4.0 release.
	- Support C++ class custom filters. (C++ class as a NN model)
	- A tensor-filter instance may have multiple model files easily.
	- Updated env-var handling logic for non-Tizen devices.
	- Unit test: higher visibility & behavior correctness fixes.
	- Auto-generated test cases for tensor-filter sub-plugins (extensions).
	- Android/Java support with more convinient methods.
	- Support gcc9.
	- Support openVino as a tensor-filter, allowing to accelerate with Intel NCS/Myriad.
	- Support NCSDK as a tensor-filter.
	- Support ARMNN as a tensor-filter. (support TF-Lite and Caffe models)
	- Reduce asserts and add error handling routines.
	- Support Androdi/SNAP as a tensor-filter.
	- Support hardware accelerators & 8-bit quantization for NNFW-Runtime & stabilize NNFW-Runtime support with test cases.
	- Support Edge-TPU and its runtime as a tensor-filter.
	- Filter subplugins refactored to have a single source file. (.cc)
	- Support model reload.
	- A lot of fixes for bugs found by Coverity, SVACE, and other static analysis tools.

1.2.0 -> 1.3.0:
	- 1.3.0 is a devel version for 1.4.0 release.
	- From 1.2.0, 1.even.x is a release and 1.odd.x is a devel version.
	- When 1.3.x is "done", it will be release as 1.4.0 and move on to 1.5.0.

1.0.0 -> 1.2.0:
	- Tizen Sensor Framework Integration. (tensor_src_tizensensor)
	- Single C-API latency shortened by bypassing GST pipeline constructions.
	- NNFW-Runtime Integration (tensor_filter::nnfw)
		- NNFW: https://git.tizen.org/cgit/platform/core/ml/nnfw/
		- Integrated & tested along with ARMCL.
	- C++ classes are suggested. (WIP)
	- Converter accepts external subplugins. (tensor_converter::*)
	- Custom-Easy mode (tensor_filter::custom_easy) for future "lambda func" support.
	- Support Tizen ncsdk2.
	- Types for path configurations are no more hardcoded.
	- Overall architecture improved/refactored. (Lowered CC, DC, and so on)
	- Fixes from 1.0.1 (Tizen 5.5 M2's stable/commercialization branch)
	- Documentation updates and bugfixes.

0.3.0 -> 1.0.0:
	- Tizen Public C-API (Single & Pipeline) Reviewed and Confirmed!
	- Tizen Public C#-API (Single) Reviewed and Confirmed!
	- Tested with Tizen Studio.
	- Official API test suites released via Tizen.
	- Android Java-API released via JCenter for Android Studio users.
	- Passed Quality Assurance. (code quality, stability, security, compliance, and so on)
		- Fixed a lot of minor bugs in the course.
	- Support macOS.
	- Fixed regressions related with ROS and Yocto support.

0.2.0 -> 0.3.0:
	- Tizen Public C-API Single/Pipeline RC1 Fixed for 5.5 M2
	- Tizen Public C-API RC2 features included. (pipeline whitelist, aliasing)
	- Tizen Public C#-API Single/Pipeline RC1.
	- Android Java-API and build infrastructure. Ready for JCenter release.
	- Tensorflow-lite / NNAPI tested & fixed.
	- Tensorflow 1.13 compatibility fix. (1.09 kept supported)
	- Caffe2/PyTorch support.
	- Movidius support.
	- This is effectively 1.0-RC1.

0.1.2 -> 0.2.0:
	- A lot of security issues and bugs fixed. (for Tizen 5.5 M1 release)
	- Tizen Public C-API Pipeline for 5.5 M1.
	- Tizen Public C-API SingleShot Prototype.
	- Yocto/Openembedded layer released.
	- ROS sink/src.
	- IIO support.
	- Android source draft.
	- Python custom filter.
	- Android sample application released.
	- Tensorflow-lite / NNAPI support.

0.1.1 -> 0.1.2:
	- Tizen Public C-API Draft Prototype.
	- Yocto/Openembedded Layer Tested.
	- ROS sink/src supported and partially tested.
	- IIO support draft.
	- Custom filter codegen.
	- Capability to cut the dependencies on audio/video plugins for minimal memory footprint.
	- More clear error messages when the pipeline cannot be initiated.
	- Increased unit test coverages with additional unit test cases.
	- Minor feature adds on elements.
	- A series of bug fixes.

0.1.0 -> 0.1.1:
	- Full "Plug & Play" capability of subplugins. (tensor_filter, tensor_filter::custom, tensor_decoder)
		- Fully configurable subplugin locations.
		- Capability to build subplungins wihtout the dependencies on nnstreamer sources.
	- Revert Tensorflow input-memcpy-less-ness for multi-tensor support. (Will support memcpy-less-ness later)
	- Support "String" type of tensors.
	- API sets updated. (still not "stable")
	- Code location refactored.
	- Yocto/Openembedded Layer Registered (not tested): "meta-neural-network".
	- No more additional shared libraries.
	- Better error handling and messages for a few plugins.
	- Android support. (N / arm64)

0.0.3 -> 0.1.0:
	- Build system migration cmake --> meson.
	- Support Tensorflow without input/output tensor memcpy.
	- other/tensor stream format updated
		- From 0.1.0, a single property, "dimension", describes the whole dimension instead of "dim1", "dim2", ...
		- Objective 1: in the future, we may support tensors with more than 4 dimensions without updating the protocol.
		- Objective 2: it was just too ugly.
	- Example applications migrated to other git repo to make this repo ready for upstreaming in the future and to ensure buildability for third party developers.
	- Support run-time attaching subplugins. (filter and decoder)
	- Support "ini" and envvar configurations for subplugin locations.
	- Dynamic external recurrences.
	- Added Subplugin API sets. (draft. do not expect backward compatibility)
	- Several bug fixes including memory leaks, incorrect logs, type checks and others.

0.0.2 -> 0.0.3:
	- Support external recurrencies with tensor_repo (more test cases are to be released later)
	- Support multi-operators with a single instance of tensor_transform (with a few limitations on the supported orders of operators)
	- Support split
	- Support bounding-box decoding (tensor_decoder)
	- Support subplugins for tensor_decoder
	- Internal APIs for dynamic configurations and subplugins. tensor_filter and tensor_decoder will be updated to use such configurations in the later releases.
	- Tensorflow support is in-progress, although it's postponed to later releases. (Still, tensorflow-lite is the only framework officially supported)
	- Pipeviz support. (tensor_converter/filter/decoder)
	- Tested with MTCNN. (each "part" is separated as an instance of tensor_filter)
	- Meson build introduced.
	- Released via build.tizen.org. (Tizen Devel. x64/x86/arm32/arm64) and launchpad.net (Ubuntu/PPA. x64/x86/arm32/arm64)
	- Static build for Android. (Not tested. No example. An example Android application is to be released later)
	- Timestamp handling / Synchronization support.
	- AWS App Testing Enabled. (testing nnstreamer application with virtual camera devices in AWS)
	- arm64 support added.

0.0.1 -> 0.0.2:
	- Support multi-tensors (other/tensors) along with mux, demux.
	- Support audio, test, binary-octet streams. (tensor converter)
	- Support image-classification decoding. (tensor_decoder)
	- Support merge.
	- More subfeatures for transform.
	- Support frame-merging by time. (tensor_aggregator)
	- More test cases w/ TAOS_CI integration.
	- Applied to and tested w/ real products.