java Neo4j 实现设备出现故障匹配相应解决方案的概率计算的示例代码？

以下是一个简单的示例代码，用于计算设备出现故障匹配相应解决方案的概率：

import org.neo4j.driver.AuthTokens;
import org.neo4j.driver.Driver;
import org.neo4j.driver.GraphDatabase;
import org.neo4j.driver.Session;
import org.neo4j.driver.Transaction;
import org.neo4j.driver.Value;
import org.neo4j.driver.types.Node;

import java.util.HashMap;
import java.util.Map;

public class FaultProbabilityCalculator {

    private final Driver driver;

    public FaultProbabilityCalculator(String uri, String username, String password) {
        driver = GraphDatabase.driver(uri, AuthTokens.basic(username, password));
    }

    public double calculateProbability(String deviceType, String faultType) {
        try (Session session = driver.session()) {
            Map<String, Object> parameters = new HashMap<>();
            parameters.put("deviceType", deviceType);
            parameters.put("faultType", faultType);
            return session.readTransaction(tx -> {
                Node deviceNode = tx.run(
                        "MATCH (d:Device {type: $deviceType}) RETURN d",
                        parameters)
                        .single()
                        .get("d")
                        .asNode();
                Node faultNode = tx.run(
                        "MATCH (f:Fault {type: $faultType}) RETURN f",
                        parameters)
                        .single()
                        .get("f")
                        .asNode();
                double total = 0;
                double count = 0;
                for (Node solutionNode : deviceNode.getRelationships()
                        .iterator()
                        .stream()
                        .filter(relationship -> relationship.getType().name().equals("HAS_SOLUTION"))
                        .map(relationship -> relationship.getEndNode())
                        .toArray(Node[]::new)) {
                    double probability = (double) solutionNode.get("probability").asDouble();
                    total += probability;
                    for (Node relatedFaultNode : solutionNode.getRelationships()
                            .iterator()
                            .stream()
                            .filter(relationship -> relationship.getType().name().equals("SOLVES"))
                            .map(relationship -> relationship.getStartNode())
                            .toArray(Node[]::new)) {
                        if (relatedFaultNode.getId() == faultNode.getId()) {
                            count += probability;
                            break;
                        }
                    }
                }
                return count / total;
            });
        }
    }

    public void close() {
        driver.close();
    }

}

该示例代码使用 Neo4j 驱动程序连接到 Neo4j 数据库，然后查询与设备类型和故障类型相关的节点和关系，计算与解决方案相关的概率，并返回与指定故障匹配的解决方案的概率。使用时，您需要更改连接字符串、用户名和密码以及查询字符串，以适应您的数据库架构和查询需求。