TFLite micro hello_world sketch fails to build

[proppy]

System information

• OS Platform and Distribution: 4.19.67-2rodete2-amd64
• Target platform: Arduino 1.8.10 w/ nano33ble target
• TensorFlow version: 1.15.0-ALPHA

Describe the problem

hello_world sketches fails to build due to a missing header file (not included in the Arduino libraries distribution).

Provide the exact sequence of commands / steps that you executed before running into the problem

• Install Arduino_TensorFlowLite@1.15.0-ALPHA
• Open hello_world example sketch
• Click the Verify ✓ button.

Any other info / logs

/usr/local/google/home/proppy/.arduino15/packages/arduino/tools/arm-none-eabi-gcc/7-2017q4/bin/arm-none-eabi-g++ -c -w -g -Os -nostdlib @/usr/local/google/home/proppy/.arduino15/packages/arduino/hardware/mbed/1.1.3/variants/ARDUINO_NANO33BLE/defines.txt @/usr/local/google/home/proppy/.arduino15/packages/arduino/hardware/mbed/1.1.3/variants/ARDUINO_NANO33BLE/cxxflags.txt -DARDUINO_ARCH_NRF52840 -mcpu=cortex-m4 -w -x c++ -E -CC -DARDUINO=10810 -DARDUINO_ARDUINO_NANO33BLE -DARDUINO_ARCH_MBED -I/usr/local/google/home/proppy/.arduino15/packages/arduino/hardware/mbed/1.1.3/cores/arduino -I/usr/local/google/home/proppy/.arduino15/packages/arduino/hardware/mbed/1.1.3/variants/ARDUINO_NANO33BLE -I/usr/local/google/home/proppy/Arduino/libraries/Arduino_TensorFlowLite/src -I/usr/local/google/home/proppy/.arduino15/packages/arduino/hardware/mbed/1.1.3/cores/arduino/api/deprecated -iprefix/usr/local/google/home/proppy/.arduino15/packages/arduino/hardware/mbed/1.1.3/cores/arduino @/usr/local/google/home/proppy/.arduino15/packages/arduino/hardware/mbed/1.1.3/variants/ARDUINO_NANO33BLE/includes.txt /tmp/arduino_build_987011/sketch/hello_world.ino.cpp -o /dev/null
Alternatives for tensorflow/lite/c/common.h: []
ResolveLibrary(tensorflow/lite/c/common.h)
  -> candidates: []
Multiple libraries were found for "TensorFlowLite.h"
In file included from /tmp/arduino_modified_sketch_134477/hello_world.ino:21:0:
 Used: /usr/local/google/home/proppy/Arduino/libraries/Arduino_TensorFlowLite
output_handler.h:19:10: error: tensorflow/lite/c/common.h: No such file or directory
 Not used: /usr/local/google/home/proppy/Arduino/libraries/tensorflow_lite
 #include "tensorflow/lite/c/common.h"
          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~

/cc @dansitu @khanhlvg

[proppy]

Simply removing the following include workaround the issue.

#include "tensorflow/lite/c/common.h"

[nutsiepully]

@advaitjain - Assigning since you're reviewing #34747

[advaitjain]

This works for me from the tip of tree. I think @proppy is running into a mismatch between the example and library version.

Can you try manually generating the latest tensorflow_lite arduino library with these steps:

make -f tensorflow/lite/experimental/micro/tools/make/Makefile clean
make -f tensorflow/lite/experimental/micro/tools/make/Makefile \
  TARGET=arduino \
  TAGS="portable_optimized" \
  generate_arduino_zip

Remove the existing tensorflow_lite library (you can also move it if you prefer that):

rm -rf ~/Arduino/libraries/tensorflow_lite

Install the newly created Arduino library:

unzip tensorflow/lite/experimental/micro/tools/make/gen/arduino_x86_64/prj/tensorflow_lite.zip -d ~/Arduino/libraries/

And then try the build.

These steps worked for me so I'm assuming that it is only some configuration issue at your end.

Adding @petewarden and @dansitu to this conversation.

[proppy]

@advaitjain Spot on!

I thought this was happening against a new installation of Arduino 1.8.10 against the latest published version of the library 1.15.0-ALPHA. But after testing against a fresh install of the library after cleaning up ~/Arduino/libraries, the hello_world example compile successfully.

I think this was due to example being picked up from a stale installation in tensorflow_lite (as shown in the compile log) while include files where being looked up in another directory Arduino_TensorFlowLite.

Sorry for the noise!