Mencantumkan objek dalam gambar dalam format JSON

Output teks berformat JSON yang mencantumkan objek yang dapat diidentifikasi model dari gambar tertentu.

Contoh kode

C#

Sebelum mencoba contoh ini, ikuti petunjuk penyiapan C# di Panduan memulai Vertex AI menggunakan library klien. Untuk mengetahui informasi selengkapnya, lihat Dokumentasi referensi API C# Vertex AI.

Untuk melakukan autentikasi ke Vertex AI, siapkan Kredensial Default Aplikasi. Untuk mengetahui informasi selengkapnya, lihat Menyiapkan autentikasi untuk lingkungan pengembangan lokal.

public async Task<string> GenerateContentWithResponseSchema6(
    string projectId = "your-project-id",
    string location = "us-central1",
    string publisher = "google",
    string model = "gemini-2.0-flash-001")
{

    var predictionServiceClient = new PredictionServiceClientBuilder
    {
        Endpoint = $"{location}-aiplatform.googleapis.com"
    }.Build();

    var responseSchema = new OpenApiSchema
    {
        Type = Type.Object,
        Properties =
        {
            ["playlist"] = new()
            {
                Type = Type.Array,
                Items = new()
                {
                    Type = Type.Object,
                    Properties =
                    {
                        ["artist"] = new() { Type = Type.String },
                        ["song"] = new() { Type = Type.String },
                        ["era"] = new() { Type = Type.String },
                        ["released"] = new() { Type = Type.Integer }
                    }
                }
            },
            ["time_start"] = new() { Type = Type.String }
        }
    };

    string prompt = @"
    We have two friends of the host who have requested a few songs for us to play. We're going to start this playlist at 8:15.
    They'll want to hear Black Hole Sun by Soundgarden because their son was born in 1994. They will also want Loser by Beck
    coming right after which is a funny choice considering it's also the same year as their son was born, but that's probably
    just a coincidence. Add Take On Me from A-ha to the list since they were married when the song released in 1985. Their final
    request is Sweet Child O' Mine by Guns N Roses, which I think came out in 1987 when they both finished university.
    Thank you, this party should be great!";

    var generateContentRequest = new GenerateContentRequest
    {
        Model = $"projects/{projectId}/locations/{location}/publishers/{publisher}/models/{model}",
        Contents =
        {
            new Content
            {
                Role = "USER",
                Parts =
                {
                    new Part { Text = prompt }
                }
            }
        },
        GenerationConfig = new GenerationConfig
        {
            ResponseMimeType = "application/json",
            ResponseSchema = responseSchema
        },
    };

    GenerateContentResponse response = await predictionServiceClient.GenerateContentAsync(generateContentRequest);

    string responseText = response.Candidates[0].Content.Parts[0].Text;
    Console.WriteLine(responseText);

    return responseText;
}

Go

Sebelum mencoba contoh ini, ikuti petunjuk penyiapan Go di Panduan memulai Vertex AI menggunakan library klien. Untuk mengetahui informasi selengkapnya, lihat Dokumentasi referensi API Go Vertex AI.

Untuk melakukan autentikasi ke Vertex AI, siapkan Kredensial Default Aplikasi. Untuk mengetahui informasi selengkapnya, lihat Menyiapkan autentikasi untuk lingkungan pengembangan lokal.

import (
	"context"
	"errors"
	"fmt"
	"io"

	"cloud.google.com/go/vertexai/genai"
)

// controlledGenerationResponseSchema6 shows how to make sure the generated output
// will always be valid JSON and adhere to a specific schema.
func controlledGenerationResponseSchema6(w io.Writer, projectID, location, modelName string) error {
	// location := "us-central1"
	// modelName := "gemini-2.0-flash-001"
	ctx := context.Background()
	client, err := genai.NewClient(ctx, projectID, location)
	if err != nil {
		return fmt.Errorf("unable to create client: %w", err)
	}
	defer client.Close()

	model := client.GenerativeModel(modelName)

	model.GenerationConfig.ResponseMIMEType = "application/json"

	// Build an OpenAPI schema, in memory
	model.GenerationConfig.ResponseSchema = &genai.Schema{
		Type: genai.TypeArray,
		Items: &genai.Schema{
			Type: genai.TypeArray,
			Items: &genai.Schema{
				Type: genai.TypeObject,
				Properties: map[string]*genai.Schema{
					"object": {
						Type: genai.TypeString,
					},
				},
			},
		},
	}

	// These images in Cloud Storage are viewable at
	// https://storage.googleapis.com/cloud-samples-data/generative-ai/image/office-desk.jpeg
	// https://storage.googleapis.com/cloud-samples-data/generative-ai/image/gardening-tools.jpeg

	img1 := genai.FileData{
		MIMEType: "image/jpeg",
		FileURI:  "gs://cloud-samples-data/generative-ai/image/office-desk.jpeg",
	}

	img2 := genai.FileData{
		MIMEType: "image/jpeg",
		FileURI:  "gs://cloud-samples-data/generative-ai/image/gardening-tools.jpeg",
	}

	prompt := "Generate a list of objects in the images."

	res, err := model.GenerateContent(ctx, img1, img2, genai.Text(prompt))
	if err != nil {
		return fmt.Errorf("unable to generate contents: %v", err)
	}

	if len(res.Candidates) == 0 ||
		len(res.Candidates[0].Content.Parts) == 0 {
		return errors.New("empty response from model")
	}

	fmt.Fprint(w, res.Candidates[0].Content.Parts[0])
	return nil
}

Java

Sebelum mencoba contoh ini, ikuti petunjuk penyiapan Java di Panduan memulai Vertex AI menggunakan library klien. Untuk mengetahui informasi selengkapnya, lihat Dokumentasi referensi API Java Vertex AI.

Untuk melakukan autentikasi ke Vertex AI, siapkan Kredensial Default Aplikasi. Untuk mengetahui informasi selengkapnya, lihat Menyiapkan autentikasi untuk lingkungan pengembangan lokal.

import com.google.cloud.vertexai.VertexAI;
import com.google.cloud.vertexai.api.GenerateContentResponse;
import com.google.cloud.vertexai.api.GenerationConfig;
import com.google.cloud.vertexai.api.Schema;
import com.google.cloud.vertexai.api.Type;
import com.google.cloud.vertexai.generativeai.ContentMaker;
import com.google.cloud.vertexai.generativeai.GenerativeModel;
import com.google.cloud.vertexai.generativeai.PartMaker;
import com.google.cloud.vertexai.generativeai.ResponseHandler;
import java.io.IOException;

public class ControlledGenerationSchema6 {
  public static void main(String[] args) throws IOException {
    // TODO(developer): Replace these variables before running the sample.
    String projectId = "genai-java-demos";
    String location = "us-central1";
    String modelName = "gemini-2.0-flash-001";

    controlGenerationWithJsonSchema6(projectId, location, modelName);
  }

  // Generate responses that are always valid JSON and comply with a JSON schema
  public static String controlGenerationWithJsonSchema6(
      String projectId, String location, String modelName)
      throws IOException {
    // Initialize client that will be used to send requests. This client only needs
    // to be created once, and can be reused for multiple requests.
    try (VertexAI vertexAI = new VertexAI(projectId, location)) {
      GenerationConfig generationConfig = GenerationConfig.newBuilder()
          .setResponseMimeType("application/json")
          .setResponseSchema(Schema.newBuilder()
              .setType(Type.ARRAY)
              .setItems(Schema.newBuilder()
                  .setType(Type.OBJECT)
                  .putProperties("object", Schema.newBuilder().setType(Type.STRING).build())
                  .build())
              .build())
          .build();

      GenerativeModel model = new GenerativeModel(modelName, vertexAI)
          .withGenerationConfig(generationConfig);

      // These images in Cloud Storage are viewable at
      // https://storage.googleapis.com/cloud-samples-data/generative-ai/image/office-desk.jpeg
      // https://storage.googleapis.com/cloud-samples-data/generative-ai/image/gardening-tools.jpeg

      GenerateContentResponse response = model.generateContent(
          ContentMaker.fromMultiModalData(
              PartMaker.fromMimeTypeAndData("image/jpeg",
                  "gs://cloud-samples-data/generative-ai/image/office-desk.jpeg"),
              PartMaker.fromMimeTypeAndData("image/jpeg",
                  "gs://cloud-samples-data/generative-ai/image/gardening-tools.jpeg"),
              "Generate a list of objects in the images."
          )
      );

      String output = ResponseHandler.getText(response);
      System.out.println(output);
      return output;
    }
  }
}

Langkah berikutnya

Untuk menelusuri dan memfilter contoh kode untuk produk Google Cloud lainnya, lihat Google Cloud browser contoh.