tensorflow: hexagon delegate fails with -- dlopen failed: cannot locate symbol "dlopen"

I’m trying to get hexagon (Qualcomm’s NN accelerator DSP) working on Android, but following the instructions leads me here.

When I run my app, I get the following crash:

2022-05-05 11:22:07.315 20487-20487/org.tensorflow.lite.examples.detection E/AndroidRuntime: FATAL EXCEPTION: main
    Process: org.tensorflow.lite.examples.detection, PID: 20487
    java.lang.UnsatisfiedLinkError: dlopen failed: cannot locate symbol "dlopen" referenced by "/data/app/~~oHfy74UV0cmPBaaworOtcA==/org.tensorflow.lite.examples.detection-KxIoTs7gEXEEvawBkjkh0A==/lib/arm64/libtensorflowlite_hexagon_jni.so"...
        at java.lang.Runtime.loadLibrary0(Runtime.java:1087)
        at java.lang.Runtime.loadLibrary0(Runtime.java:1008)
        at java.lang.System.loadLibrary(System.java:1664)
        at org.tensorflow.lite.examples.detection.tflite.TFLiteObjectDetectionAPIModel.create(TFLiteObjectDetectionAPIModel.java:145)

I’m trying to run this on the tflite object_detection example app from github.com/tensorflow/examples, on Android.

My Android device:

Device: Xiaomi Redmi Note 9 Pro

adb shell getprop ro.product.device
    joyeuse

adb shell getprop ro.board.platform
    atoll

If I adb shell into /data/app/~~oHfy74UV0cmPBaaworOtcA==/org.tensorflow.lite.examples.detection-KxIoTs7gEXEEvawBkjkh0A==/lib/arm64, and ls, then I see the following files:

libhexagon_interface.so                        
libhexagon_nn_skel.so                          
libhexagon_nn_skel_v65.so                      
libhexagon_nn_skel_v66.so                      
libtensorflowlite_hexagon_jni.so               
libtensorflowlite_jni.so

It seems very strange that dlopen itself is not found!

About this issue

Original URL
State: closed
Created 2 years ago
Comments: 50 (19 by maintainers)

Most upvoted comments

@karimnosseir , i am also seeing the same issue. i can run the tflite model using benchmark_model on adb command line and using nnapi delegage as well. however when i use hexagon delegate in my android app (java code), get the above error. simply following instructions here https://www.tensorflow.org/lite/android/delegates/hexagon

pls note that there are no instructions on how to add the lib hexagons (.so files) to the android app. some clear instructions would be helpful

amitmate on May 12, 2022