# TIM-VX - Tensor Interface Module for OpenVX

TIM-VX is a software integration module provided by VeriSilicon to facilitate deployment of Neural-Networks on OpenVX enabled ML accelerators. It serves as the backend binding for runtime frameworks such as Android NN, Tensorflow-Lite, MLIR, TVM and more.

Main Features
 - Over 130 internal operators with rich format support for both quantized and floating point
 - Simplified binding API calls to create Tensors and Operations
 - Dynamic graph construction and supports shape inferencing
 - Built-in custom layer extensions
 - A set of utility functions for debugging

## Framework Support

- [Tensorflow-Lite Delegate](https://github.com/VeriSilicon/tensorflow/tree/dev/vx-delegate) (Unofficial)
- [OAID Tegine](https://github.com/OAID/Tengine) (Official)
- MLIR Dialect (In development)
- TVM (In development)

## Roadmap

Roadmap of TIM-VX will be updated here in the future.

## Get started

### Build and Run
TIM-VX uses [bazel](https://bazel.build) build system by default. [Install bazel](https://docs.bazel.build/versions/master/install.html) first to get started.

TIM-VX needs to be compiled and linked against VeriSilicon OpenVX SDK which provides related header files and pre-compiled libraries. A default linux-x86_64 SDK is provided which contains the simulation environment on PC. Platform specific SDKs can be obtained from respective SoC vendors.

To build TIM-VX
```shell
bazel build libtim-vx.so
```

To run sample LeNet
```shell
# set VIVANTE_SDK_DIR for runtime compilation environment
export VIVANTE_SDK_DIR=`pwd`/prebuilt-sdk/x86_64_linux

bazel build //samples/lenet:lenet_asymu8_cc
bazel run //samples/lenet:lenet_asymu8_cc
```

To build and run Tensorflow-Lite delegate on A311D platform
```shell
# clone and cross build VeriSilicon tensorflow fork with TFlite delegate support
git clone --single-branch --branch dev/vx-delegate git@github.com:VeriSilicon/tensorflow.git vx-delegate; cd vx-delegate
bazel build --config A311D //tensorflow/lite/tools/benchmark:benchmark_model

# push benchmark_model onto device and run
./benchmark_model --graph=mobilenet_v1_1.0_224_quant.tflite --use_vxdelegate=true
```