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# 从语义上对搜索服务的结果进行排名
<a name="search-service-rerank"></a>

Amazon Kendra 智能排名使用 Amazon Kendra语义搜索功能对搜索服务的结果进行重新排名。它通过考虑搜索查询的上下文以及搜索服务文档中的所有可用信息来做到这一点。 Amazon Kendra 智能排名可以改善简单的关键字匹配。

[CreateRescoreExecutionPlan](https://docs.aws.amazon.com/kendra/latest/APIReference/API_Ranking_CreateRescoreExecutionPlan.html)API 会创建用于配置 [Rescore](https://docs.aws.amazon.com/kendra/latest/APIReference/API_Ranking_Rescore.html) API 的 Amazon Kendra 智能排名资源。`Rescore`API 会对来自搜索服务（例如 [OpenSearch （自我管理）](https://docs.aws.amazon.com/kendra/latest/dg/opensearch-rerank.html)的搜索结果进行重新排名。

调用 `CreateRescoreExecutionPlan` 时，您可以设置所需的容量单位，以便对搜索服务的结果进行重新排名。如果您不需要超过单个单位默认值的容量单位，请不要更改默认值。只需为重新评分执行计划提供一个名称。您最多可以设置 1000 个额外单位。有关单个容量单位中包含的内容的信息，请参阅[调整容量](https://docs.aws.amazon.com/kendra/latest/dg/adjusting-capacity.html)。配置 Amazon Kendra 智能排名后，将根据您设定的容量单位按小时收费。查看[免费套餐和价格信息](https://aws.amazon.com/kendra/intelligent-ranking-pricing/)。

调用 `CreateRescoreExecutionPlan` 时，系统会生成一个重新评分执行计划 ID，并在响应中返回。`Rescore` API 使用重新评分执行计划 ID，按照您设置的容量对搜索服务的结果进行重新排名。您可以在搜索服务的配置文件中包含重新评分执行计划 ID。[例如，如果您使用 OpenSearch （自我管理），则可以在您的 docker-compose.yml 或 opensearch.yml 文件中包含重新分数执行计划 ID，请参阅智能排名（自助服务）结果。 OpenSearch ](https://docs.aws.amazon.com/kendra/latest/dg/opensearch-rerank.html)

调用 `CreateRescoreExecutionPlan` 时，还会在响应中生成 Amazon 资源名称（ARN）。您可以使用此 ARN 在 AWS Identity and Access Management (IAM) 中创建权限策略，以限制用户访问特定重新评分执行计划的特定 ARN。有关授予将 `Rescore` API 用于特定重新评分执行计划的权限的 IAM 策略示例，请参阅[自我 OpenSearch管理的Amazon Kendra 智能排名](https://docs.aws.amazon.com/kendra/latest/dg/opensearch-rerank.html)。

下面是创建容量单位设置为 1 的重新评分执行计划的示例。

------
#### [ CLI ]

```
aws kendra-ranking create-rescore-execution-plan \
  --name MyRescoreExecutionPlan \ 
  --capacity-units '{"RescoreCapacityUnits":1}'
 
Response:
 
{
    "Id": "<rescore execution plan ID>",
    "Arn": "arn:aws:kendra-ranking:<region>:<account-id>:rescore-execution-plan/<rescore-execution-plan-id>"
}
```

------
#### [ Python ]

```
import boto3
from botocore.exceptions import ClientError
import pprint
import time

kendra_ranking = boto3.client("kendra-ranking")

print("Create a rescore execution plan.")

# Provide a name for the rescore execution plan
name = "MyRescoreExecutionPlan"
# Set your required additional capacity units
# Don't set capacity units if you don't require more than 1 unit given by default
capacity_units = 1

try:
    rescore_execution_plan_response = kendra_ranking.create_rescore_execution_plan(
        Name = name,
        CapacityUnits = {"RescoreCapacityUnits":capacity_units}
    )

    pprint.pprint(rescore_execution_plan_response)

    rescore_execution_plan_id = rescore_execution_plan_response["Id"]

    print("Wait for Amazon Kendra to create the rescore execution plan.")

    while True:
        # Get the details of the rescore execution plan, such as the status
        rescore_execution_plan_description = kendra_ranking.describe_rescore_execution_plan(
            Id = rescore_execution_plan_id
        )
        # When status is not CREATING quit.
        status = rescore_execution_plan_description["Status"]
        print(" Creating rescore execution plan. Status: "+status)
        time.sleep(60)
        if status != "CREATING":
            break

except ClientError as e:
        print("%s" % e)

print("Program ends.")
```

------
#### [ Java ]

```
import java.util.concurrent.TimeUnit;

import software.amazon.awssdk.services.kendraranking.KendraRankingClient;
import software.amazon.awssdk.services.kendraranking.model.CapacityUnitsConfiguration;
import software.amazon.awssdk.services.kendraranking.model.CreateRescoreExecutionPlanRequest;
import software.amazon.awssdk.services.kendraranking.model.CreateRescoreExecutionPlanResponse;
import software.amazon.awssdk.services.kendraranking.model.DescribeRescoreExecutionPlanRequest;
import software.amazon.awssdk.services.kendraranking.model.DescribeRescoreExecutionPlanResponse;
import software.amazon.awssdk.services.kendraranking.model.RescoreExecutionPlanStatus;

public class CreateRescoreExecutionPlanExample {

  public static void main(String[] args) throws InterruptedException {

    String rescoreExecutionPlanName = "MyRescoreExecutionPlan";
    int capacityUnits = 1;

    KendraRankingClient kendraRankingClient = KendraRankingClient.builder().build();

    System.out.println(String.format("Creating a rescore execution plan named %s", rescoreExecutionPlanName));

    CreateRescoreExecutionPlanResponse createResponse = kendraRankingClient.createRescoreExecutionPlan(
        CreateRescoreExecutionPlanRequest.builder()
            .name(rescoreExecutionPlanName)
            .capacityUnits(
                CapacityUnitsConfiguration.builder()
                    .rescoreCapacityUnits(capacityUnits)
                    .build()
            )
            .build()
    );

    String rescoreExecutionPlanId = createResponse.id();
    System.out.println(String.format("Waiting for rescore execution plan with id %s to finish creating.", rescoreExecutionPlanId));
    while (true) {
      DescribeRescoreExecutionPlanResponse describeResponse = kendraRankingClient.describeRescoreExecutionPlan(
          DescribeRescoreExecutionPlanRequest.builder()
              .id(rescoreExecutionPlanId)
              .build()
      );
      RescoreExecutionPlanStatus rescoreExecutionPlanStatus = describeResponse.status();
      if (rescoreExecutionPlanStatus != RescoreExecutionPlanStatus.CREATING) {
        break;
      }
      TimeUnit.SECONDS.sleep(60);
    }

    System.out.println("Rescore execution plan creation is complete.");
  }
}
```

------

下面是更新重新评分执行计划以将容量单位设置为 2 的示例。

------
#### [ CLI ]

```
aws kendra-ranking update-rescore-execution-plan \
  --id <rescore execution plan ID> \ 
  --capacity-units '{"RescoreCapacityUnits":2}'
```

------
#### [ Python ]

```
import boto3
from botocore.exceptions import ClientError
import pprint
import time

kendra_ranking = boto3.client("kendra-ranking")
                    
print("Update a rescore execution plan.")
                    
# Provide the ID of the rescore execution plan
id = <rescore execution plan ID>
# Re-set your required additional capacity units
capacity_units = 2
                        
try:
    kendra_ranking.update_rescore_execution_plan(
        Id = id,
        CapacityUnits = {"RescoreCapacityUnits":capacity_units}
    )
                        
    print("Wait for Amazon Kendra to update the rescore execution plan.")
                        
    while True:
        # Get the details of the rescore execution plan, such as the status
        rescore_execution_plan_description = kendra_ranking.describe_rescore_execution_plan(
            Id = id
        )
        # When status is not UPDATING quit.
        status = rescore_execution_plan_description["Status"]
        print(" Updating rescore execution plan. Status: "+status)
        time.sleep(60)
        if status != "UPDATING":
            break
                        
except ClientError as e:
        print("%s" % e)
                        
print("Program ends.")
```

------
#### [ Java ]

```
import java.util.concurrent.TimeUnit;

import software.amazon.awssdk.services.kendraranking.KendraRankingClient;
import software.amazon.awssdk.services.kendraranking.model.CapacityUnitsConfiguration;
import software.amazon.awssdk.services.kendraranking.model.DescribeRescoreExecutionPlanRequest;
import software.amazon.awssdk.services.kendraranking.model.DescribeRescoreExecutionPlanResponse;
import software.amazon.awssdk.services.kendraranking.model.RescoreExecutionPlanStatus;
import software.amazon.awssdk.services.kendraranking.model.UpdateRescoreExecutionPlanRequest;
import software.amazon.awssdk.services.kendraranking.model.UpdateRescoreExecutionPlanResponse;

public class UpdateRescoreExecutionPlanExample {

  public static void main(String[] args) throws InterruptedException {

    String rescoreExecutionPlanId = <rescore execution plan ID>;
    int newCapacityUnits = 2;

    KendraRankingClient kendraRankingClient = KendraRankingClient.builder().build();

    System.out.println(String.format("Updating a rescore execution plan named %s", rescoreExecutionPlanId));

    UpdateRescoreExecutionPlanResponse updateResponse = kendraRankingClient.updateRescoreExecutionPlan(
        UpdateRescoreExecutionPlanRequest.builder()
            .id(rescoreExecutionPlanId)
            .capacityUnits(
                CapacityUnitsConfiguration.builder()
                    .rescoreCapacityUnits(newCapacityUnits)
                    .build()
            )
            .build()
    );

    System.out.println(String.format("Waiting for rescore execution plan with id %s to finish updating.", rescoreExecutionPlanId));
    while (true) {
      DescribeRescoreExecutionPlanResponse describeResponse = kendraRankingClient.describeRescoreExecutionPlan(
          DescribeRescoreExecutionPlanRequest.builder()
              .id(rescoreExecutionPlanId)
              .build()
      );
      RescoreExecutionPlanStatus rescoreExecutionPlanStatus = describeResponse.status();
      if (rescoreExecutionPlanStatus != RescoreExecutionPlanStatus.UPDATING) {
        break;
      }
      TimeUnit.SECONDS.sleep(60);
    }

    System.out.println("Rescore execution plan update is complete.");
  }
}
```

------

下面是使用 `Rescore` API 的示例。

------
#### [ CLI ]

```
aws kendra-ranking rescore \
  --rescore-execution-plan-id <rescore execution plan ID> \
  --search-query "intelligent systems" \
  --documents "[{\"Id\": \"DocId1\",\"Title\": \"Smart systems\", \"Body\": \"intelligent systems in everyday life\",\"OriginalScore\": 2.0}, {\"Id\": \"DocId2\",\"Title\": \"Smarter systems\", \"Body\": \"living with intelligent systems\",\"OriginalScore\": 1.0}]"
```

------
#### [ Python ]

```
import boto3
from botocore.exceptions import ClientError
import pprint

kendra_ranking = boto3.client("kendra-ranking")
                    
print("Use the Rescore API.")
                    
# Provide the ID of the rescore execution plan
id = <rescore execution plan ID>
# The search query from the search service
query = "intelligent systems"
# The list of documents for Intelligent Ranking to rescore
document_list = [
    {"Id": "DocId1", "Title": "Smart systems", "Body": "intelligent systems in everyday life", "OriginalScore": 2.0},
    {"Id": "DocId2", "Title": "Smarter systems", "Body": "living with intelligent systems", "OriginalScore": 1.0}
]
                        
try:
    rescore_response = kendra_ranking.rescore(
        rescore_execution_plan_id = id,
        search_query = query,
        documents = document_list
    )
    
    print(rescore_response["RescoreId"])
    print(rescore_resposne["ResultItems"])
	
except ClientError as e:
        print("%s" % e)

print("Program ends.")
```

------
#### [ Java ]

```
import java.util.ArrayList;
import java.util.List;

import software.amazon.awssdk.services.kendraranking.KendraRankingClient;
import software.amazon.awssdk.services.kendraranking.model.RescoreRequest;
import software.amazon.awssdk.services.kendraranking.model.RescoreResponse;
import software.amazon.awssdk.services.kendraranking.model.Document;

public class RescoreExample {

  public static void main(String[] args) {

    String rescoreExecutionPlanId = <rescore execution plan ID>;
    String query = "intelligent systems";

    List<Document> documentList = new ArrayList<>();
    documentList.add(
        Document.builder()
            .id("DocId1")
            .originalScore(2.0F)
            .body("intelligent systems in everyday life")
            .title("Smart systems")
            .build()
    );
    documentList.add(
        Document.builder()
            .id("DocId2")
            .originalScore(1.0F)
            .body("living with intelligent systems")
            .title("Smarter systems")
            .build()
    );

    KendraRankingClient kendraRankingClient = KendraRankingClient.builder().build();

    RescoreResponse rescoreResponse = kendraRankingClient.rescore(
        RescoreRequest.builder()
            .rescoreExecutionPlanId(rescoreExecutionPlanId)
            .searchQuery(query)
            .documents(documentList)
            .build()
    );
    
    System.out.println(rescoreResponse.rescoreId());
    System.out.println(rescoreResponse.resultItems());
  }
}
```

------