investigating why the input to the model is incorrect resulting in error on initialization.

install_tflite.bat

@@ -0,0 +1,38 @@
+@echo off
+setlocal enableextensions
+
+cd %~dp0
+
+set TF_VERSION=2.5
+set URL=https://github.com/am15h/tflite_flutter_plugin/releases/download/
+set TAG=tf_%TF_VERSION%
+
+set ANDROID_DIR=android\app\src\main\jniLibs\
+set ANDROID_LIB=libtensorflowlite_c.so
+
+set ARM_DELEGATE=libtensorflowlite_c_arm_delegate.so
+set ARM_64_DELEGATE=libtensorflowlite_c_arm64_delegate.so
+set ARM=libtensorflowlite_c_arm.so
+set ARM_64=libtensorflowlite_c_arm64.so
+set X86=libtensorflowlite_c_x86_delegate.so
+set X86_64=libtensorflowlite_c_x86_64_delegate.so
+
+SET /A d = 0
+
+:GETOPT
+if /I "%1"=="-d" SET /A d = 1
+
+SETLOCAL
+if %d%==1 CALL :Download %ARM_DELEGATE% armeabi-v7a
+if %d%==1 CALL :Download %ARM_64_DELEGATE% arm64-v8a
+if %d%==0 CALL :Download %ARM% armeabi-v7a
+if %d%==0 CALL :Download %ARM_64% arm64-v8a
+CALL :Download %X86% x86
+CALL :Download %X86_64% x86_64
+EXIT /B %ERRORLEVEL%
+
+:Download
+curl -L -o %~1 %URL%%TAG%/%~1
+mkdir %ANDROID_DIR%%~2\
+move /-Y %~1 %ANDROID_DIR%%~2\%ANDROID_LIB%
+EXIT /B 0

install_tflite.sh

@@ -0,0 +1,52 @@
+#!/usr/bin/env bash
+
+cd "$(dirname "$(readlink -f "$0")")"
+
+# Available versions
+# 2.5, 2.4.1
+
+TF_VERSION=2.5
+URL="https://github.com/am15h/tflite_flutter_plugin/releases/download/"
+TAG="tf_$TF_VERSION"
+
+ANDROID_DIR="android/app/src/main/jniLibs/"
+ANDROID_LIB="libtensorflowlite_c.so"
+
+ARM_DELEGATE="libtensorflowlite_c_arm_delegate.so"
+ARM_64_DELEGATE="libtensorflowlite_c_arm64_delegate.so"
+ARM="libtensorflowlite_c_arm.so"
+ARM_64="libtensorflowlite_c_arm64.so"
+X86="libtensorflowlite_c_x86_delegate.so"
+X86_64="libtensorflowlite_c_x86_64_delegate.so"
+
+delegate=0
+
+while getopts "d" OPTION
+do
+	case $OPTION in
+		d)  delegate=1;;
+	esac
+done
+
+
+download () {
+    wget "${URL}${TAG}/$1" -O "$1"
+    mkdir -p "${ANDROID_DIR}$2/"
+    mv $1 "${ANDROID_DIR}$2/${ANDROID_LIB}"
+}
+
+if [ ${delegate} -eq 1 ]
+then
+
+download ${ARM_DELEGATE} "armeabi-v7a"
+download ${ARM_64_DELEGATE} "arm64-v8a"
+
+else
+
+download ${ARM} "armeabi-v7a"
+download ${ARM_64} "arm64-v8a"
+
+fi
+
+download ${X86} "x86"
+download ${X86_64} "x86_64"

lib/main.dart

@@ -1,5 +1,5 @@
 import 'package:flutter/material.dart';
-import 'package:tensordex_mobile/ui/home.dart';
+import 'package:tensordex_mobile/ui/tensordex_home.dart';
 import 'package:tensordex_mobile/utils/logger.dart';
 
 Future<void> main() async {

lib/tflite/classifier.dart

@@ -0,0 +1,160 @@
+import 'dart:math';
+import 'dart:ui';
+
+import 'package:collection/collection.dart';
+import 'package:image/image.dart' as image_lib;
+import 'package:tflite_flutter/tflite_flutter.dart';
+import 'package:tflite_flutter_helper/tflite_flutter_helper.dart';
+
+import '../utils/logger.dart';
+import '../utils/recognition.dart';
+import '../utils/stats.dart';
+
+/// Classifier
+class Classifier {
+  static const String MODEL_FILE_NAME = "detect.tflite";
+  static const String LABEL_FILE_NAME = "labelmap.txt";
+
+  /// Input size of image (height = width = 300)
+  static const int INPUT_SIZE = 224;
+
+  /// Result score threshold
+  static const double THRESHOLD = 0.5;
+
+  /// [ImageProcessor] used to pre-process the image
+  ImageProcessor? imageProcessor;
+
+  /// Padding the image to transform into square
+  // int padSize = 0;
+  /// Instance of Interpreter
+  late Interpreter _interpreter;
+
+  late TensorBuffer _outputBuffer;
+  late var _probabilityProcessor;
+
+  /// Labels file loaded as list
+  late List<String> _labels;
+
+  /// Number of results to show
+  static const int NUM_RESULTS = 10;
+
+  Classifier({
+    Interpreter? interpreter,
+    List<String>? labels,
+  }) {
+    loadModel(interpreter: interpreter);
+    loadLabels(labels: labels);
+  }
+
+  /// Loads interpreter from asset
+  void loadModel({Interpreter? interpreter}) async {
+    try {
+      _interpreter = interpreter ??
+          await Interpreter.fromAsset(
+            MODEL_FILE_NAME,
+            options: InterpreterOptions()..threads = 4,
+          );
+      var outputTensor = _interpreter.getOutputTensor(0);
+      var outputShape = outputTensor.shape;
+      var outputType = outputTensor.type;
+
+      var inputTensor = _interpreter.getInputTensor(0);
+      var intputShape = inputTensor.shape;
+      var intputType = inputTensor.type;
+
+      _outputBuffer = TensorBuffer.createFixedSize(outputShape, outputType);
+      _probabilityProcessor =
+          TensorProcessorBuilder().add(NormalizeOp(0, 1)).build();
+    } catch (e) {
+      logger.e("Error while creating interpreter: ", e);
+    }
+  }
+
+  /// Loads labels from assets
+  void loadLabels({List<String>? labels}) async {
+    try {
+      _labels = labels ?? await FileUtil.loadLabels("assets/labels.txt");
+    } catch (e) {
+      logger.e("Error while loading labels: $e");
+    }
+  }
+
+  /// Pre-process the image
+  TensorImage? getProcessedImage(TensorImage inputImage) {
+    // padSize = max(inputImage.height, inputImage.width);
+    imageProcessor ??= ImageProcessorBuilder()
+        // .add(ResizeWithCropOrPadOp(padSize, padSize))
+        .add(ResizeOp(INPUT_SIZE, INPUT_SIZE, ResizeMethod.BILINEAR))
+        .add(NormalizeOp(127.5, 127.5))
+        .build();
+    return imageProcessor?.process(inputImage);
+  }
+
+  /// Runs object detection on the input image
+  Map<String, dynamic>? predict(image_lib.Image image) {
+    logger.i(labels);
+    var predictStartTime = DateTime.now().millisecondsSinceEpoch;
+    if (_interpreter == null) {
+      logger.e("Interpreter not initialized");
+      return null;
+    }
+    var preProcessStart = DateTime.now().millisecondsSinceEpoch;
+    // Create TensorImage from image
+    // Pre-process TensorImage
+    var procImage = getProcessedImage(TensorImage.fromImage(image));
+
+    var preProcessElapsedTime =
+        DateTime.now().millisecondsSinceEpoch - preProcessStart;
+    if (procImage != null) {
+      var inferenceTimeStart = DateTime.now().millisecondsSinceEpoch;
+      // run inference
+      var inferenceTimeElapsed =
+          DateTime.now().millisecondsSinceEpoch - inferenceTimeStart;
+
+      logger.i("Sending image to ML");
+
+      logger.i(procImage.buffer.asFloat32List());
+      logger.i(procImage.width);
+      logger.i(procImage.height);
+      logger.i(procImage.tensorBuffer.shape);
+      logger.i(procImage.tensorBuffer.isDynamic);
+      _interpreter.run(procImage.buffer, _outputBuffer.getBuffer());
+
+      Map<String, double> labeledProb = TensorLabel.fromList(
+              labels, _probabilityProcessor.process(_outputBuffer))
+          .getMapWithFloatValue();
+      final pred = getTopProbability(labeledProb);
+      Recognition rec = Recognition(1, pred.key, pred.value);
+      var predictElapsedTime = DateTime.now().millisecondsSinceEpoch - predictStartTime;
+      return {
+        "recognitions": rec,
+        "stats": Stats(predictElapsedTime, predictElapsedTime, predictElapsedTime, predictElapsedTime),
+      };
+    } else {
+      return null;
+    }
+  }
+
+  /// Gets the interpreter instance
+  Interpreter get interpreter => _interpreter;
+
+  /// Gets the loaded labels
+  List<String> get labels => _labels;
+}
+
+MapEntry<String, double> getTopProbability(Map<String, double> labeledProb) {
+  var pq = PriorityQueue<MapEntry<String, double>>(compare);
+  pq.addAll(labeledProb.entries);
+
+  return pq.first;
+}
+
+int compare(MapEntry<String, double> e1, MapEntry<String, double> e2) {
+  if (e1.value > e2.value) {
+    return -1;
+  } else if (e1.value == e2.value) {
+    return 0;
+  } else {
+    return 1;
+  }
+}

lib/ui/poke_view.dart

@@ -2,6 +2,9 @@ import 'dart:isolate';
 
 import 'package:camera/camera.dart';
 import 'package:flutter/material.dart';
+import 'package:tensordex_mobile/tflite/classifier.dart';
+import 'package:tflite_flutter/tflite_flutter.dart';
+import 'package:tensordex_mobile/utils/image_utils.dart';
 
 import '../utils/logger.dart';
 import '../utils/recognition.dart';
@@ -30,10 +33,13 @@ class _CameraViewState extends State<CameraView> with WidgetsBindingObserver {
 
   /// Controller
   late CameraController cameraController;
+  Interpreter? interp;
 
   /// true when inference is ongoing
   bool predicting = false;
 
+  late Classifier classy;
+
   // /// Instance of [Classifier]
   // Classifier classifier;
   //
@@ -56,9 +62,28 @@ class _CameraViewState extends State<CameraView> with WidgetsBindingObserver {
     // Camera initialization
     initializeCamera();
 
+    // final gpuDelegateV2 = GpuDelegateV2(
+    //     options: GpuDelegateOptionsV2(
+    //       isPrecisionLossAllowed: false,
+    //       inferencePreference: TfLiteGpuInferenceUsage.fastSingleAnswer,
+    //       inferencePriority1: TfLiteGpuInferencePriority.minLatency,
+    //       inferencePriority2: TfLiteGpuInferencePriority.auto,
+    //       inferencePriority3: TfLiteGpuInferencePriority.auto,
+    //     ));
+
+
+    logger.e("CREATING THE INTERPRETOR");
+    var interpreterOptions = InterpreterOptions();//..addDelegate(gpuDelegateV2);
+    interp = await Interpreter.fromAsset('efficientnet_v2s.tflite',
+        options: interpreterOptions);
+    logger.e("CREATING THE INTERPRETOR");
+
+    classy = Classifier(interpreter: interp);
+    logger.i(interp?.getOutputTensors());
     // Create an instance of classifier to load model and labels
     // classifier = Classifier();
 
+
     // Initially predicting = false
     predicting = false;
   }
@@ -94,7 +119,7 @@ class _CameraViewState extends State<CameraView> with WidgetsBindingObserver {
   @override
   Widget build(BuildContext context) {
     // Return empty container while the camera is not initialized
-    if (!cameraController.value.isInitialized || cameraController == null) {
+    if (!cameraController.value.isInitialized) {
       return Container();
     }
 
@@ -114,6 +139,16 @@ class _CameraViewState extends State<CameraView> with WidgetsBindingObserver {
       predicting = true;
     });
     logger.i("RECIEVED IMAGE");
+    logger.i(cameraImage.format.group);
+    logger.i(cameraImage);
+    var converted = ImageUtils.convertCameraImage(cameraImage);
+    if (converted != null){
+
+      var result = classy.predict(converted);
+
+      logger.e("PREDICTED IMAGE");
+      logger.i(result);
+    }
     // logger.i(cameraImage);
     // logger.i(cameraImage.height);
     // logger.i(cameraImage.width);

lib/ui/results_view.dart

@@ -0,0 +1,33 @@
+import 'package:flutter/material.dart';
+import 'package:tensordex_mobile/ui/poke_view.dart';
+import 'package:tensordex_mobile/utils/recognition.dart';
+
+import '../utils/logger.dart';
+
+/// [CameraView] sends each frame for inference
+class ResultsView extends StatefulWidget {
+
+  /// Constructor
+  const ResultsView({Key? key}) : super(key: key);
+
+
+  void setResults(Recognition results){
+    logger.i("RESULTS IN THE RESULT VIEW");
+  }
+
+  @override
+  State<ResultsView> createState() => _ResultsViewState();
+}
+
+class _ResultsViewState extends State<ResultsView> {
+
+  @override
+  void initState() {
+    super.initState();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Text("data");
+  }
+}

lib/ui/tensordex_home.dart

@@ -1,6 +1,6 @@
 import 'package:flutter/material.dart';
-import 'package:camera/camera.dart';
 import 'package:tensordex_mobile/ui/poke_view.dart';
+import 'package:tensordex_mobile/ui/results_view.dart';
 
 import '../utils/logger.dart';
 import '../utils/recognition.dart';
@@ -25,7 +25,6 @@ class TensordexHome extends StatefulWidget {
 }
 
 class _TensordexHomeState extends State<TensordexHome> {
-  int _counter = 0;
 
   /// Results to draw bounding boxes
   List<Recognition>? results;
@@ -38,7 +37,6 @@ class _TensordexHomeState extends State<TensordexHome> {
 
   void _incrementCounter() {
     setState(() {
-      _counter++;
       logger.d("Counter Incremented!");
       logger.w("Counter Incremented!");
       logger.e("Counter Incremented!");
@@ -129,8 +127,6 @@ class _TensordexHomeState extends State<TensordexHome> {
 
   @override
   void dispose() {
-    // controller.dispose();
-    // WidgetsBinding.instance.removeObserver(this);
     super.dispose();
   }
 
@@ -158,17 +154,10 @@ class _TensordexHomeState extends State<TensordexHome> {
           child: Column(
             mainAxisAlignment: MainAxisAlignment.center,
             children: <Widget>[
-              const Text(
-                'You have pushed the button this many times:',
-              ),
-              Text(
-                '$_counter',
-                style: Theme.of(context).textTheme.headline4,
-              ),
               CameraView(
                   resultsCallback: resultsCallback,
-                  statsCallback: statsCallback
+                  statsCallback: statsCallback),
-              ),
+              const ResultsView(),
             ],
           ),
         ),

pubspec.lock

@@ -65,7 +65,7 @@ packages:
     source: hosted
     version: "1.1.0"
   collection:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: collection
       url: "https://pub.dartlang.org"
@@ -343,6 +343,20 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.9.0"
+  tflite_flutter_helper:
+    dependency: "direct main"
+    description:
+      name: tflite_flutter_helper
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.3.1"
+  tuple:
+    dependency: transitive
+    description:
+      name: tuple
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.0"
   typed_data:
     dependency: transitive
     description:

pubspec.yaml

@@ -39,6 +39,8 @@ dependencies:
   logger: ^1.1.0
   path_provider: ^2.0.11
   tflite_flutter: ^0.9.0
+  tflite_flutter_helper: ^0.3.1
+  collection: ^1.16.0
 
 dev_dependencies:
   flutter_test: