A problem occurred evaluating project ':tflite'

Question

I try to use tflite package to create a live object detection app, but it seems that after i installed both the packages : tflite and camera, and also writing the detection code it doesn't seem to run .

Packages : Tflite : https://pub.dev/packages/tflite Camera : https://pub.dev/packages/camera

this error occure :

A problem occurred evaluating project ':tflite'.

The entire Error :

FAILURE: Build failed with an exception.

* Where:
Build file 'C:\Users\Hepha\Documents\flutter_windows_2.10.3-stable\flutter\.pub-cache\hosted\pub.dartlang.org\tflite-1.1.2\android\build.gradle' line: 24

* What went wrong:
A problem occurred evaluating project ':tflite'.
> No signature of method: build_a7q9josm4oau2t0m3mow48bac.android() is applicable for argument types: (build_a7q9josm4oau2t0m3mow48bac$_run_closure2) values: [build_a7q9josm4oau2t0m3mow48bac$_run_closure2@c7c7456]   

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 1m 43s
Running Gradle task 'assembleDebug'... 104,7s|Exception: Gradle task assembleDebug failed with exit code 1

My pubspec.yaml file :

dependencies:
  flutter:
    sdk: flutter

  cupertino_icons: ^1.0.2
  camera: ^0.9.4+1
  image_picker: ^0.8.4+11
  tflite: ^1.1.2

dev_dependencies:
  flutter_test:
    sdk: flutter

  flutter_lints: ^2.0.0

flutter:

  uses-material-design: true

  assets:
      - assets/
      - assets/labels.txt
      - assets/metadata_V2.tflite

My android/app/build.gradle file :

def localProperties = new Properties()
def localPropertiesFile = rootProject.file('local.properties')
if (localPropertiesFile.exists()) {
    localPropertiesFile.withReader('UTF-8') { reader ->
        localProperties.load(reader)
    }
}

def flutterRoot = localProperties.getProperty('flutter.sdk')
if (flutterRoot == null) {
    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
}

def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
if (flutterVersionCode == null) {
    flutterVersionCode = '1'
}

def flutterVersionName = localProperties.getProperty('flutter.versionName')
if (flutterVersionName == null) {
    flutterVersionName = '1.0'
}

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"

android {
    compileSdkVersion flutter.compileSdkVersion
    ndkVersion flutter.ndkVersion
    
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

    kotlinOptions {
        jvmTarget = '1.8'
    }

    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }

    defaultConfig {
        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
        applicationId "com.example.aiassistantapp"
        // You can update the following values to match your application needs.
        // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-build-configuration.
        minSdkVersion 21
        targetSdkVersion flutter.targetSdkVersion
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
    }

    buildTypes {
        release {
            // TODO: Add your own signing config for the release build.
            // Signing with the debug keys for now, so `flutter run --release` works.
            signingConfig signingConfigs.debug
        }
    }
     aaptOptions {
        noCompress 'tflite'
        noCompress 'lite'
    }
}

flutter {
    source '../..'
}

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
}

Can anyone help me please ? thank you

Answer 1

So first, to get rid of this error you should change this on ~\tflite-1.1.2\android\build.gradle:

dependencies {
    compile 'org.tensorflow:tensorflow-lite:+'
    compile 'org.tensorflow:tensorflow-lite-gpu:+'
}

to this:

dependencies {
    implementation 'org.tensorflow:tensorflow-lite:+'
    implementation 'org.tensorflow:tensorflow-lite-gpu:+'
}

Just change compile to implementation based on that github issue in tflite to solve the issue that you post above. for me it worked as a charm, but when I try to infer my models with some images, this error emerged Caused by: java.lang.IllegalArgumentException: Cannot convert between a TensorFlowLite tensor with type UINT8 and a Java object of type [[F (which is compatible with the TensorFlowLite type FLOAT32). and the whole application crash. So if your model image based so check this answer its related to quantization of model when you export yours. Just do this:

config = QuantizationConfig.for_float16()
model.export(export_dir='.', tflite_filename='model_fp16.tflite', quantization_config=config)

hope this works for you!