Tensorflow Lite Android native层C/C++开发

Tensorflow Lite Android C/C++

1， Tensorflow Lite Android NDK 编译编译native库

libtensorflowlite_jni.so为native库，libtensorflowlite.jar所实现java接口，libtensorflowlite-native-header.jar为联系native和java层的JNI接口头文件。

Java的实现：

tensorflow/bazel-tensorflow/tensorflow/lite/java/src/main/java

native的实现：

tensorflow/bazel-tensorflow/tensorflow/lite/java/src/main/native

2，libtensorflowlite-native-header.jar

jar包里有如下头文件：

$ tree libtensorflowlite-native-header
libtensorflowlite-native-header
├── META-INF
│   └── MANIFEST.MF
├── org_tensorflow_lite_NativeInterpreterWrapper.h
├── org_tensorflow_lite_Tensor.h
└── org_tensorflow_lite_TensorFlowLite.h

（1) org_tensorflow_lite_TensorFlowLite.hz

版本号API和初始化Tensorflow Lite的API；

/*
 * Class:     org_tensorflow_lite_TensorFlowLite
 * Method:    version
 * Signature: ()Ljava/lang/String;
 */
JNIEXPORT jstring JNICALL Java_org_tensorflow_lite_TensorFlowLite_version
  (JNIEnv *, jclass);

/*
 * Class:     org_tensorflow_lite_TensorFlowLite
 * Method:    initTensorFlow
 * Signature: ()V
 */
JNIEXPORT void JNICALL Java_org_tensorflow_lite_TensorFlowLite_initTensorFlow
  (JNIEnv *, jclass);

Java_org_tensorflow_lite_TensorFlowLite_version在native/tensorflow_lite_jni.c和native/tensorflow_lite_jni.h中实现。

Java_org_tensorflow_lite_TensorFlowLite_initTensorFlow在native/init_tensorflow_jni.cc和native/init_tensorflow_jni.h中实现；调用了namespace tflite中的InitTensorFlow。

JNIEXPORT void JNICALL Java_org_tensorflow_lite_TensorFlowLite_initTensorFlow(
    JNIEnv* env, jclass clazz) {
  ::tflite::InitTensorFlow();
}

(2) org_tensorflow_lite_NativeInterpreterWrapper.h

主要为interpreter接口；

/*
 * Class:     org_tensorflow_lite_NativeInterpreterWrapper
 * Method:    run
 * Signature: (JJ)Z
 */
JNIEXPORT jboolean JNICALL Java_org_tensor