本文為英文版的機器翻譯版本，如內容有任何歧義或不一致之處，概以英文版為準。

# 使用 additionalParams 物件來調整模型訓練資訊的匯出
<a name="machine-learning-additionalParams"></a>

`additionalParams` 物件包含若干欄位，您可以使用這些欄位，來指定機器學習類別標籤特徵以供訓練用途，並且指導訓練資料組態檔案的建立。

匯出程序無法自動推斷哪些節點和邊緣屬性應該是機器學習類別標籤，以作為訓練用途的範例。它也無法自動推斷數值、類別和文字屬性的最佳特徵編碼，因此您需要使用 `additionalParams` 物件中的欄位提供提示，來指定這些項目或覆寫預設編碼。

對於屬性圖資料，匯出要求中 `additionalParams` 的最上層結構可能如下所示：

```
{
  "command": "export-pg",
  "outputS3Path": "s3://(your Amazon S3 bucket)/neptune-export",
  "params": {
    "endpoint": "(your Neptune endpoint DNS name)",
    "profile": "neptune_ml"
  },
  "additionalParams": {
      "neptune_ml": {
        "version": "v2.0",
        "targets": [ (an array of node and edge class label targets) ],
        "features": [ (an array of node feature hints) ]
    }
  }
}
```

對於 RDF 資料，其最上層結構可能如下所示：

```
{
  "command": "export-rdf",
  "outputS3Path": "s3://(your Amazon S3 bucket)/neptune-export",
  "params": {
    "endpoint": "(your Neptune endpoint DNS name)",
    "profile": "neptune_ml"
  },
  "additionalParams": {
      "neptune_ml": {
        "version": "v2.0",
        "targets": [ (an array of node and edge class label targets) ]
    }
  }
}
```

您也可以使用 `jobs` 欄位來提供多個匯出組態：

```
{
  "command": "export-pg",
  "outputS3Path": "s3://(your Amazon S3 bucket)/neptune-export",
  "params": {
    "endpoint": "(your Neptune endpoint DNS name)",
    "profile": "neptune_ml"
  },
  "additionalParams" : {
    "neptune_ml" : {
      "version": "v2.0",
      "jobs": [
        {
          "name" : "(training data configuration name)",
          "targets": [ (an array of node and edge class label targets) ],
          "features": [ (an array of node feature hints) ]
        },
        {
          "name" : "(another training data configuration name)",
          "targets": [ (an array of node and edge class label targets) ],
          "features": [ (an array of node feature hints) ]
        }
      ]
    }
  }
}
```