画像オブジェクト検出の予測

predict メソッドを使用して画像オブジェクト検出の予測を取得します。

このコードサンプルを含む詳細なドキュメントについては、以下をご覧ください。

画像オブジェクト検出モデルから予測を取得する

コードサンプル

Java

このサンプルを試す前に、Vertex AI クイックスタート: クライアントライブラリの使用にある Java の設定手順を完了してください。詳細については、Vertex AI Java API のリファレンスドキュメントをご覧ください。

Vertex AI に対する認証を行うには、アプリケーションのデフォルト認証情報を設定します。詳細については、ローカル開発環境の認証を設定するをご覧ください。


import com.google.cloud.aiplatform.util.ValueConverter;
import com.google.cloud.aiplatform.v1.EndpointName;
import com.google.cloud.aiplatform.v1.PredictResponse;
import com.google.cloud.aiplatform.v1.PredictionServiceClient;
import com.google.cloud.aiplatform.v1.PredictionServiceSettings;
import com.google.cloud.aiplatform.v1.schema.predict.instance.ImageObjectDetectionPredictionInstance;
import com.google.cloud.aiplatform.v1.schema.predict.params.ImageObjectDetectionPredictionParams;
import com.google.cloud.aiplatform.v1.schema.predict.prediction.ImageObjectDetectionPredictionResult;
import com.google.protobuf.Value;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.Base64;
import java.util.List;

public class PredictImageObjectDetectionSample {

  public static void main(String[] args) throws IOException {
    // TODO(developer): Replace these variables before running the sample.
    String project = "YOUR_PROJECT_ID";
    String fileName = "YOUR_IMAGE_FILE_PATH";
    String endpointId = "YOUR_ENDPOINT_ID";
    predictImageObjectDetection(project, fileName, endpointId);
  }

  static void predictImageObjectDetection(String project, String fileName, String endpointId)
      throws IOException {
    PredictionServiceSettings settings =
        PredictionServiceSettings.newBuilder()
            .setEndpoint("us-central1-aiplatform.googleapis.com:443")
            .build();

    // Initialize client that will be used to send requests. This client only needs to be created
    // once, and can be reused for multiple requests. After completing all of your requests, call
    // the "close" method on the client to safely clean up any remaining background resources.
    try (PredictionServiceClient predictionServiceClient =
        PredictionServiceClient.create(settings)) {
      String location = "us-central1";
      EndpointName endpointName = EndpointName.of(project, location, endpointId);

      byte[] contents = Base64.getEncoder().encode(Files.readAllBytes(Paths.get(fileName)));
      String content = new String(contents, StandardCharsets.UTF_8);

      ImageObjectDetectionPredictionParams params =
          ImageObjectDetectionPredictionParams.newBuilder()
              .setConfidenceThreshold((float) (0.5))
              .setMaxPredictions(5)
              .build();

      ImageObjectDetectionPredictionInstance instance =
          ImageObjectDetectionPredictionInstance.newBuilder().setContent(content).build();

      List<Value> instances = new ArrayList<>();
      instances.add(ValueConverter.toValue(instance));

      PredictResponse predictResponse =
          predictionServiceClient.predict(endpointName, instances, ValueConverter.toValue(params));
      System.out.println("Predict Image Object Detection Response");
      System.out.format("\tDeployed Model Id: %s\n", predictResponse.getDeployedModelId());

      System.out.println("Predictions");
      for (Value prediction : predictResponse.getPredictionsList()) {

        ImageObjectDetectionPredictionResult.Builder resultBuilder =
            ImageObjectDetectionPredictionResult.newBuilder();

        ImageObjectDetectionPredictionResult result =
            (ImageObjectDetectionPredictionResult)
                ValueConverter.fromValue(resultBuilder, prediction);

        for (int i = 0; i < result.getIdsCount(); i++) {
          System.out.printf("\tDisplay name: %s\n", result.getDisplayNames(i));
          System.out.printf("\tConfidences: %f\n", result.getConfidences(i));
          System.out.printf("\tIDs: %d\n", result.getIds(i));
          System.out.printf("\tBounding boxes: %s\n", result.getBboxes(i));
        }
      }
    }
  }
}

Node.js

このサンプルを試す前に、Vertex AI クイックスタート: クライアントライブラリの使用にある Node.js の設定手順を完了してください。詳細については、Vertex AI Node.js API のリファレンスドキュメントをご覧ください。

/**
 * TODO(developer): Uncomment these variables before running the sample.\
 * (Not necessary if passing values as arguments)
 */

// const filename = "YOUR_PREDICTION_FILE_NAME";
// const endpointId = "YOUR_ENDPOINT_ID";
// const project = 'YOUR_PROJECT_ID';
// const location = 'YOUR_PROJECT_LOCATION';
const aiplatform = require('@google-cloud/aiplatform');
const {instance, params, prediction} =
  aiplatform.protos.google.cloud.aiplatform.v1.schema.predict;

// Imports the Google Cloud Prediction Service Client library
const {PredictionServiceClient} = aiplatform.v1;

// Specifies the location of the api endpoint
const clientOptions = {
  apiEndpoint: 'us-central1-aiplatform.googleapis.com',
};

// Instantiates a client
const predictionServiceClient = new PredictionServiceClient(clientOptions);

async function predictImageObjectDetection() {
  // Configure the endpoint resource
  const endpoint = `projects/${project}/locations/${location}/endpoints/${endpointId}`;

  const parametersObj = new params.ImageObjectDetectionPredictionParams({
    confidenceThreshold: 0.5,
    maxPredictions: 5,
  });
  const parameters = parametersObj.toValue();

  const fs = require('fs');
  const image = fs.readFileSync(filename, 'base64');
  const instanceObj = new instance.ImageObjectDetectionPredictionInstance({
    content: image,
  });

  const instanceVal = instanceObj.toValue();
  const instances = [instanceVal];
  const request = {
    endpoint,
    instances,
    parameters,
  };

  // Predict request
  const [response] = await predictionServiceClient.predict(request);

  console.log('Predict image object detection response');
  console.log(`\tDeployed model id : ${response.deployedModelId}`);
  const predictions = response.predictions;
  console.log('Predictions :');
  for (const predictionResultVal of predictions) {
    const predictionResultObj =
      prediction.ImageObjectDetectionPredictionResult.fromValue(
        predictionResultVal
      );
    for (const [i, label] of predictionResultObj.displayNames.entries()) {
      console.log(`\tDisplay name: ${label}`);
      console.log(`\tConfidences: ${predictionResultObj.confidences[i]}`);
      console.log(`\tIDs: ${predictionResultObj.ids[i]}`);
      console.log(`\tBounding boxes: ${predictionResultObj.bboxes[i]}\n\n`);
    }
  }
}
predictImageObjectDetection();

Python

このサンプルを試す前に、Vertex AI クイックスタート: クライアントライブラリの使用にある Python の設定手順を完了してください。詳細については、Vertex AI Python API のリファレンスドキュメントをご覧ください。

import base64

from google.cloud import aiplatform
from google.cloud.aiplatform.gapic.schema import predict

def predict_image_object_detection_sample(
    project: str,
    endpoint_id: str,
    filename: str,
    location: str = "us-central1",
    api_endpoint: str = "us-central1-aiplatform.googleapis.com",
):
    # The AI Platform services require regional API endpoints.
    client_options = {"api_endpoint": api_endpoint}
    # Initialize client that will be used to create and send requests.
    # This client only needs to be created once, and can be reused for multiple requests.
    client = aiplatform.gapic.PredictionServiceClient(client_options=client_options)
    with open(filename, "rb") as f:
        file_content = f.read()

    # The format of each instance should conform to the deployed model's prediction input schema.
    encoded_content = base64.b64encode(file_content).decode("utf-8")
    instance = predict.instance.ImageObjectDetectionPredictionInstance(
        content=encoded_content,
    ).to_value()
    instances = [instance]
    # See gs://google-cloud-aiplatform/schema/predict/params/image_object_detection_1.0.0.yaml for the format of the parameters.
    parameters = predict.params.ImageObjectDetectionPredictionParams(
        confidence_threshold=0.5,
        max_predictions=5,
    ).to_value()
    endpoint = client.endpoint_path(
        project=project, location=location, endpoint=endpoint_id
    )
    response = client.predict(
        endpoint=endpoint, instances=instances, parameters=parameters
    )
    print("response")
    print(" deployed_model_id:", response.deployed_model_id)
    # See gs://google-cloud-aiplatform/schema/predict/prediction/image_object_detection_1.0.0.yaml for the format of the predictions.
    predictions = response.predictions
    for prediction in predictions:
        print(" prediction:", dict(prediction))

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