在 Google Cloud 控制台中,Vertex AI 提供滑桿,可用於調整所有類別或標籤,或個別類別或標籤的信心閾值。您可以在模型的詳細資料頁面中,透過「評估」分頁標籤使用滑桿。可信度門檻是指模型為測試項目指派類別或標籤時必須達到的信心程度。調整門檻後,您可以查看模型的精確度和喚回度有何變化。較高的門檻值通常會提高精確度,但降低喚回率。
[[["容易理解","easyToUnderstand","thumb-up"],["確實解決了我的問題","solvedMyProblem","thumb-up"],["其他","otherUp","thumb-up"]],[["難以理解","hardToUnderstand","thumb-down"],["資訊或程式碼範例有誤","incorrectInformationOrSampleCode","thumb-down"],["缺少我需要的資訊/範例","missingTheInformationSamplesINeed","thumb-down"],["翻譯問題","translationIssue","thumb-down"],["其他","otherDown","thumb-down"]],["上次更新時間:2025-09-02 (世界標準時間)。"],[],[],null,["# Interpret prediction results from text classification models\n\n| Starting on September 15, 2024, you can only customize classification, entity extraction, and sentiment analysis objectives by moving to Vertex AI Gemini prompts and tuning. Training or updating models for Vertex AI AutoML for Text classification, entity extraction, and sentiment analysis objectives will no longer be available. You can continue using existing Vertex AI AutoML Text models until June 15, 2025. For a comparison of AutoML text and Gemini, see [Gemini for AutoML text users](/vertex-ai/docs/start/automl-gemini-comparison). For more information about how Gemini offers enhanced user experience through improved prompting capabilities, see [Introduction to tuning](/vertex-ai/generative-ai/docs/models/tune-gemini-overview). To get started with tuning, see [Model tuning for Gemini text models](/vertex-ai/generative-ai/docs/models/tune_gemini/tune-gemini-learn)\n\nAfter requesting a prediction, Vertex AI returns results based on your\nmodel's objective. Predictions from multi-label classification models return one\nor more labels for each document and a confidence score for each label. For\nsingle-label classification models, predictions return only one label and\nconfidence score per document.\n\n\nThe confidence score communicates how strongly your model associates each\nclass or label with a test item. The higher the number, the higher the model's\nconfidence that the label should be applied to that item. You decide how high\nthe confidence score must be for you to accept the model's results.\n\n\u003cbr /\u003e\n\nScore threshold slider\n----------------------\n\n\nIn the Google Cloud console, Vertex AI provides a slider that's\nused to adjust the confidence threshold for all classes or labels, or an\nindividual class or label. The slider is available on a model's detail page in\nthe **Evaluate** tab. The confidence threshold is the confidence level that\nthe model must have for it to assign a class or label to a test item. As you\nadjust the threshold, you can see how your model's precision and recall\nchanges. Higher thresholds typically increase precision and lower recall.\n\n\u003cbr /\u003e\n\nExample batch prediction output\n-------------------------------\n\nThe following sample is the predicted result for a multi-label classification\nmodel. The model applied the `GreatService`, `Suggestion`, and `InfoRequest`\nlabels to the submitted document. The confidence values apply to each of the\nlabels in order. In this example, the model predicted `GreatService` as the most\nrelevant label.\n\n\n| **Note**: The following JSON Lines example includes line breaks for\n| readability. In your JSON Lines files, line breaks are included only after each\n| each JSON object.\n\n\u003cbr /\u003e\n\n\n```\n{\n \"instance\": {\"content\": \"gs://bucket/text.txt\", \"mimeType\": \"text/plain\"},\n \"predictions\": [\n {\n \"ids\": [\n \"1234567890123456789\",\n \"2234567890123456789\",\n \"3234567890123456789\"\n ],\n \"displayNames\": [\n \"GreatService\",\n \"Suggestion\",\n \"InfoRequest\"\n ],\n \"confidences\": [\n 0.8986392080783844,\n 0.81984345316886902,\n 0.7722353458404541\n ]\n }\n ]\n}\n```"]]