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Edge Impulse stand-alone inferencing example (linking Edge Impulse library)

This repository demonstrates pre-compiling the Edge Impulse's C++ library export (includes model) into a shared or static library and linking to a C or C++ application.

No hardware optimization! This example repository contains the bare minimum example of compiling your impulse, and does not contain hardware optimizations for MPUs or on Linux. See example-standalone-inferencing-linux to compile with optimizations.

See shared/ for example of linking with precompiled shared Edge Impulse library and see static for an example with linking with a statically linked library.

Getting Started

To build only the library skip this step and jump to Build your [static|shared] library and link with application

To get started head over to your Edge Impulse project, and go to Deployment. From here you can create the full library which contains the impulse and all external required libraries. Select C++ library, and click Build to create the library.

Download the .zip, extract and place the contents in C/ and/or C++/ directory depending on which you'd like to build.

Copy a test sample's raw features into the features[] array in C++/*/source/main.cpp or in C/*/source/main.c. To obtain raw features head back to Studio and click on the Live Classification. Then load a validation sample and then copy the Raw Features. For more information see Add data sample to main.cpp

Build static library and link with application

  • To build C application:
    • Go to C/static
  • To build C++ application:
    • Go to C++/static

Then in a terminal or console:

macOS, Linux

sh build.sh

Windows

build.bat

This will build build/edge-impulse-standalone and the build/libedgeimpulse.a

Build shared library and link with application

  • To build C application:
    • Go to C/shared
  • To build C++ application:
    • Go to C++/shared

Then in a terminal or console:

macOS, Linux

sh build.sh

Windows

build.bat

This will build build/edge-impulse-standalone and the build/libedgeimpulse.so

Execute the application

To run the built application go to the console or terminal and:

./build/edge-impulse-stadanlone

E.g. if you built with the following:

you'd get similar results as below:

run_classifier returned: 0
Timing: DSP 0 ms, inference 0 ms, anomaly 0 ms
Predictions:
  idle: 0.00000
  snake: 0.00000
  updown: 0.99609
  wave: 0.00000
Anomaly prediction: -0.540

Other toolchain (or cross-compilation)

To use another toolchain other than GNU (gcc/g++) e.g. clang.

clang.

Then you can do so as follows:

CC=clang CXX=clang++ make -j

Target specific builds

This repo builds the application by default for your computer (x86). However this can easily adapted for your (embedded) target. Edit Makefile for your target. See e.g. "Target specific" in Makefile.

Further reading

License

Apache License v2.0