Output JSON di generazione controllata con valori null

Consenti al modello di restituire risposte nulle quando non dispone di contesto sufficiente per generare una risposta significativa.

Per saperne di più

Per la documentazione dettagliata che include questo esempio di codice, consulta quanto segue:

Esempio di codice

C#

Prima di provare questo esempio, segui le istruzioni di configurazione C# riportate nella guida rapida all'utilizzo delle librerie client di Vertex AI. Per ulteriori informazioni, consulta la documentazione di riferimento dell'API C# di Vertex AI.

Per autenticarti a Vertex AI, configura le Credenziali predefinite dell'applicazione. Per ulteriori informazioni, consulta Configurare l'autenticazione per un ambiente di sviluppo locale. 

public async Task<string> GenerateContentWithResponseSchema3(
    string projectId = "your-project-id",
    string location = "us-central1",
    string publisher = "google",
    string model = "gemini-1.5-pro-001")
{

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

    var responseSchema = new OpenApiSchema
    {
        Type = Type.Object,
        Properties =
        {
            ["forecast"] = new()
            {
                Type = Type.Array,
                Items = new()
                {
                    Type = Type.Object,
                    Properties =
                    {
                        ["Forecast"] = new() { Type = Type.String },
                        ["Humidity"] = new() { Type = Type.String },
                        ["Temperature"] = new() { Type = Type.Integer },
                        ["Wind Speed"] = new() { Type = Type.Integer }
                    }
                }
            }
        }
    };

    string prompt = @"
    The week ahead brings a mix of weather conditions.
    Sunday is expected to be sunny with a temperature of 77°F and a humidity level of 50%. Winds will be light at around 10 km/h.
    Monday will see partly cloudy skies with a slightly cooler temperature of 72°F and humidity increasing to 55%. Winds will pick up slightly to around 15 km/h.
    Tuesday brings rain showers, with temperatures dropping to 64°F and humidity rising to 70%. Expect stronger winds at 20 km/h.
    Wednesday may see thunderstorms, with a temperature of 68°F and high humidity of 75%. Winds will be gusty at 25 km/h.
    Thursday will be cloudy with a temperature of 66°F and moderate humidity at 60%. Winds will ease slightly to 18 km/h.
    Friday returns to partly cloudy conditions, with a temperature of 73°F and lower humidity at 45%. Winds will be light at 12 km/h.
    Finally, Saturday rounds off the week with sunny skies, a temperature of 80°F, and a humidity level of 40%. Winds will be gentle at 8 km/h.";

    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

Prima di provare questo esempio, segui le istruzioni di configurazione Go riportate nella guida rapida all'utilizzo delle librerie client di Vertex AI. Per ulteriori informazioni, consulta la documentazione di riferimento dell'API Go di Vertex AI.

Per autenticarti a Vertex AI, configura le Credenziali predefinite dell'applicazione. Per ulteriori informazioni, consulta Configurare l'autenticazione per un ambiente di sviluppo locale. 

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

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

// controlledGenerationResponseSchema3 shows how to make sure the generated output
// will always be valid JSON and adhere to a specific schema.
func controlledGenerationResponseSchema3(w io.Writer, projectID, location, modelName string) error {
	// location := "us-central1"
	// modelName := "gemini-1.5-pro-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.TypeObject,
		Properties: map[string]*genai.Schema{
			"forecast": {
				Type: genai.TypeArray,
				Items: &genai.Schema{
					Type: genai.TypeObject,
					Properties: map[string]*genai.Schema{
						"Day": {
							Type: genai.TypeString,
						},
						"Forecast": {
							Type: genai.TypeString,
						},
						"Humidity": {
							Type: genai.TypeString,
						},
						"Temperature": {
							Type: genai.TypeInteger,
						},
						"Wind Speed": {
							Type: genai.TypeInteger,
						},
					},
					Required: []string{"Day", "Temperature", "Forecast"},
				},
			},
		},
	}

	prompt := `
		The week ahead brings a mix of weather conditions.
		Sunday is expected to be sunny with a temperature of 77°F and a humidity level of 50%. Winds will be light at around 10 km/h.
		Monday will see partly cloudy skies with a slightly cooler temperature of 72°F and humidity increasing to 55%. Winds will pick up slightly to around 15 km/h.
		Tuesday brings rain showers, with temperatures dropping to 64°F and humidity rising to 70%. Expect stronger winds at 20 km/h.
		Wednesday may see thunderstorms, with a temperature of 68°F and high humidity of 75%. Winds will be gusty at 25 km/h.
		Thursday will be cloudy with a temperature of 66°F and moderate humidity at 60%. Winds will ease slightly to 18 km/h.
		Friday returns to partly cloudy conditions, with a temperature of 73°F and lower humidity at 45%. Winds will be light at 12 km/h.
		Finally, Saturday rounds off the week with sunny skies, a temperature of 80°F, and a humidity level of 40%. Winds will be gentle at 8 km/h.
	`

	res, err := model.GenerateContent(ctx, 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

Prima di provare questo esempio, segui le istruzioni di configurazione Java riportate nella guida rapida all'utilizzo delle librerie client di Vertex AI. Per ulteriori informazioni, consulta la documentazione di riferimento dell'API Java di Vertex AI.

Per autenticarti a Vertex AI, configura le Credenziali predefinite dell'applicazione. Per ulteriori informazioni, consulta Configurare l'autenticazione per un ambiente di sviluppo locale. 

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.GenerativeModel;
import com.google.cloud.vertexai.generativeai.ResponseHandler;
import java.io.IOException;
import java.util.Arrays;

public class ControlledGenerationSchema3 {
  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-1.5-pro-001";

    controlGenerationWithJsonSchema3(projectId, location, modelName);
  }

  // Generate responses that are always valid JSON and comply with a JSON schema
  public static String controlGenerationWithJsonSchema3(
      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.OBJECT)
              .putProperties("forecast", Schema.newBuilder()
                      .setType(Type.ARRAY)
                      .setItems(Schema.newBuilder()
                          .setType(Type.OBJECT)
                          .putProperties("Day", Schema.newBuilder()
                              .setType(Type.STRING)
                              .build())
                          .putProperties("Forecast", Schema.newBuilder()
                              .setType(Type.STRING)
                              .build())
                          .putProperties("Humidity", Schema.newBuilder()
                              .setType(Type.STRING)
                              .build())
                          .putProperties("Temperature", Schema.newBuilder()
                              .setType(Type.INTEGER)
                              .build())
                          .putProperties("Wind Speed", Schema.newBuilder()
                              .setType(Type.INTEGER)
                              .build())
                          .addAllRequired(Arrays.asList("Day", "Temperature", "Forecast"))
                          .build())
                      .build())
              )
          .build();

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

      GenerateContentResponse response = model.generateContent(
          "The week ahead brings a mix of weather conditions.\n"
              + "Sunday is expected to be sunny with a temperature of 77°F and a humidity level "
              + "of 50%. Winds will be light at around 10 km/h.\n"
              + "Monday will see partly cloudy skies with a slightly cooler temperature of 72°F "
              + "and humidity increasing to 55%. Winds will pick up slightly to around 15 km/h.\n"
              + "Tuesday brings rain showers, with temperatures dropping to 64°F and humidity"
              + "rising to 70%. Expect stronger winds at 20 km/h.\n"
              + "Wednesday may see thunderstorms, with a temperature of 68°F and high humidity "
              + "of 75%. Winds will be gusty at 25 km/h.\n"
              + "Thursday will be cloudy with a temperature of 66°F and moderate humidity at 60%. "
              + "Winds will ease slightly to 18 km/h.\n"
              + "Friday returns to partly cloudy conditions, with a temperature of 73°F and lower "
              + "humidity at 45%. Winds will be light at 12 km/h.\n"
              + "Finally, Saturday rounds off the week with sunny skies, a temperature of 80°F, "
              + "and a humidity level of 40%. Winds will be gentle at 8 km/h."
      );

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

Python

Prima di provare questo esempio, segui le istruzioni di configurazione Python riportate nella guida rapida all'utilizzo delle librerie client di Vertex AI. Per ulteriori informazioni, consulta la documentazione di riferimento dell'API Python di Vertex AI.

Per autenticarti a Vertex AI, configura le Credenziali predefinite dell'applicazione. Per ulteriori informazioni, consulta Configurare l'autenticazione per un ambiente di sviluppo locale. 

import vertexai

from vertexai.generative_models import GenerationConfig, GenerativeModel

# TODO(developer): Update and un-comment below line
# PROJECT_ID = "your-project-id"

vertexai.init(project=PROJECT_ID, location="us-central1")

response_schema = {
    "type": "OBJECT",
    "properties": {
        "forecast": {
            "type": "ARRAY",
            "items": {
                "type": "OBJECT",
                "properties": {
                    "Day": {"type": "STRING", "nullable": True},
                    "Forecast": {"type": "STRING", "nullable": True},
                    "Temperature": {"type": "INTEGER", "nullable": True},
                    "Humidity": {"type": "STRING", "nullable": True},
                    "Wind Speed": {"type": "INTEGER", "nullable": True},
                },
                "required": ["Day", "Temperature", "Forecast", "Wind Speed"],
            },
        }
    },
}

prompt = """
    The week ahead brings a mix of weather conditions.
    Sunday is expected to be sunny with a temperature of 77°F and a humidity level of 50%. Winds will be light at around 10 km/h.
    Monday will see partly cloudy skies with a slightly cooler temperature of 72°F and the winds will pick up slightly to around 15 km/h.
    Tuesday brings rain showers, with temperatures dropping to 64°F and humidity rising to 70%.
    Wednesday may see thunderstorms, with a temperature of 68°F.
    Thursday will be cloudy with a temperature of 66°F and moderate humidity at 60%.
    Friday returns to partly cloudy conditions, with a temperature of 73°F and the Winds will be light at 12 km/h.
    Finally, Saturday rounds off the week with sunny skies, a temperature of 80°F, and a humidity level of 40%. Winds will be gentle at 8 km/h.
"""

model = GenerativeModel("gemini-1.5-pro-002")

response = model.generate_content(
    prompt,
    generation_config=GenerationConfig(
        response_mime_type="application/json", response_schema=response_schema
    ),
)

print(response.text)
# Example response:
#  {"forecast": [{"Day": "Sunday", "Forecast": "Sunny", "Temperature": 77, "Humidity": "50%", "Wind Speed": 10},
#     {"Day": "Monday", "Forecast": "Partly Cloudy", "Temperature": 72, "Wind Speed": 15},
#     {"Day": "Tuesday", "Forecast": "Rain Showers", "Temperature": 64, "Humidity": "70%"},
#     {"Day": "Wednesday", "Forecast": "Thunderstorms", "Temperature": 68},
#     {"Day": "Thursday", "Forecast": "Cloudy", "Temperature": 66, "Humidity": "60%"},
#     {"Day": "Friday", "Forecast": "Partly Cloudy", "Temperature": 73, "Wind Speed": 12},
#     {"Day": "Saturday", "Forecast": "Sunny", "Temperature": 80, "Humidity": "40%", "Wind Speed": 8}]}

Passaggi successivi

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