English

Milvus 中的 english 分析器旨在处理英文文本，应用特定语言规则进行标记化和过滤。

定义

english 分析器使用以下组件：

• Tokenizer（分词器）：使用 standard Standard Tokenizer 将文本分割成离散的单词单位。

• 过滤器：包括多个过滤器，用于全面处理文本：

• lowercase：将所有标记转换为小写，从而实现不区分大小写的搜索。

• stemmer：将单词还原为词根形式，以支持更广泛的匹配（例如，"running "变为 "run"）。

• stop_words：删除常见的英文停用词，以便集中搜索文本中的关键词语。

english 分析器的功能相当于以下自定义分析器配置：

Python

Python

analyzer_params = {
        "tokenizer": "standard",
        "filter": [
                "lowercase",
                {
                        "type": "stemmer",
                        "language": "english"
                }, {
                        "type": "stop",
                        "stop_words": "_english_"
                }
        ]
}

Java

Java

Map<String, Object> analyzerParams = new HashMap<>();
analyzerParams.put("tokenizer", "standard");
analyzerParams.put("filter",
        Arrays.asList("lowercase",
                new HashMap<String, Object>() {{
                    put("type", "stemmer");
                    put("language", "english");
                }},
                new HashMap<String, Object>() {{
                    put("type", "stop");
                    put("stop_words", Collections.singletonList("_english_"));
                }}
        )
);

Node.js

JavaScript

const analyzerParams = {
    "type": "standard", // Specifies the standard analyzer type
    "stop_words": ["of"] // Optional: List of words to exclude from tokenization
}

Go

Go

analyzerParams = map[string]any{"tokenizer": "standard",
        "filter": []any{"lowercase", map[string]any{
            "type":     "stemmer",
            "language": "english",
        }, map[string]any{
            "type":       "stop",
            "stop_words": "_english_",
        }}}

cURL

Shell

# restful
analyzerParams='{
  "tokenizer": "standard",
  "filter": [
    "lowercase",
    {
      "type": "stemmer",
      "language": "english"
    },
    {
      "type": "stop",
      "stop_words": "_english_"
    }
  ]
}'

配置

要将 english 分析器应用到一个字段，只需在 analyzer_params 中将 type 设置为 english，并根据需要加入可选参数即可。

Python

Python

analyzer_params = {
    "type": "english",
}

Java

Java

Map<String, Object> analyzerParams = new HashMap<>();
analyzerParams.put("type", "english");

Node.js

JavaScript

const analyzerParams = {
    "type": "english",
}

Go

Go

analyzerParams = map[string]any{"type": "english"}

cURL

Shell

# restful
analyzerParams='{
  "type": "english"
}'

english 分析器接受以下可选参数：

参数	说明
stop_words	一个数组，包含将从标记化中删除的停用词列表。默认为 _english_，这是一组内置的常用英语停用词。

自定义停用词配置示例：

Python

Python

analyzer_params = {
    "type": "english",
    "stop_words": ["a", "an", "the"]
}

Java

Java

Map<String, Object> analyzerParams = new HashMap<>();
analyzerParams.put("type", "english");
analyzerParams.put("stop_words", Arrays.asList("a", "an", "the"));

Node.js

JavaScript

const analyzerParams = {
    "type": "english",
    "stop_words": ["a", "an", "the"]
}

Go

Go

analyzerParams = map[string]any{"type": "english", "stop_words": []string{"a", "an", "the"}}

cURL

Shell

# restful
analyzerParams='{
  "type": "english",
  "stop_words": [
    "a",
    "an",
    "the"
  ]
}'

定义 analyzer_params 后，您可以在定义 Collection Schema 时将其应用到 VARCHAR 字段。这样，Milvus 就能使用指定的分析器处理该字段中的文本，从而实现高效的标记化和过滤。有关详情，请参阅 示例使用。

示例

在将分析器配置应用到 Collection Schema 之前，请使用 run_analyzer 方法验证其行为。

Analyzer 配置

Python

Python

analyzer_params = {
    "type": "english",
    "stop_words": ["a", "an", "the"]
}

Java

Java

Map<String, Object> analyzerParams = new HashMap<>();
analyzerParams.put("type", "english");
analyzerParams.put("stop_words", Arrays.asList("a", "an", "the"));

Node.js

Milvus v2.6.x 的官方资料尚未提供经过源码验证的 Node.js 示例。

Go

Go

analyzerParams = map[string]any{"type": "english", "stop_words": []string{"a", "an", "the"}}

cURL

Shell

# restful
analyzerParams='{
  "type": "english",
  "stop_words": [
    "a",
    "an",
    "the"
  ]
}'

验证使用 run_analyzer

Python

Python

from pymilvus import (
    MilvusClient,
)

client = MilvusClient(uri="http://localhost:19530")

# Sample text to analyze
sample_text = "Milvus is a vector database built for scale!"

# Run the standard analyzer with the defined configuration
result = client.run_analyzer(sample_text, analyzer_params)
print("English analyzer output:", result)

Java

Java

import io.milvus.v2.client.ConnectConfig;
import io.milvus.v2.client.MilvusClientV2;
import io.milvus.v2.service.vector.request.RunAnalyzerReq;
import io.milvus.v2.service.vector.response.RunAnalyzerResp;

ConnectConfig config = ConnectConfig.builder()
        .uri("http://localhost:19530")
        .build();
MilvusClientV2 client = new MilvusClientV2(config);

List<String> texts = new ArrayList<>();
texts.add("Milvus is a vector database built for scale!");

RunAnalyzerResp resp = client.runAnalyzer(RunAnalyzerReq.builder()
        .texts(texts)
        .analyzerParams(analyzerParams)
        .build());
List<RunAnalyzerResp.AnalyzerResult> results = resp.getResults();

Node.js

Milvus v2.6.x 的官方资料尚未提供经过源码验证的 Node.js 示例。

Go

Go

import (
    "context"
    "encoding/json"
    "fmt"

    "github.com/milvus-io/milvus/client/v2/milvusclient"
)

client, err := milvusclient.New(ctx, &milvusclient.ClientConfig{
    Address: "localhost:19530",
    APIKey:  "root:Milvus",
})
if err != nil {
    fmt.Println(err.Error())
    // handle error
}

bs, _ := json.Marshal(analyzerParams)
texts := []string{"Milvus is a vector database built for scale!"}
option := milvusclient.NewRunAnalyzerOption(texts).
    WithAnalyzerParams(string(bs))

result, err := client.RunAnalyzer(ctx, option)
if err != nil {
    fmt.Println(err.Error())
    // handle error
}

cURL

Milvus v2.6.x 的官方资料尚未提供经过源码验证的 cURL 示例。

预期输出

Text

English analyzer output: ['milvus', 'vector', 'databas', 'built', 'scale']