PaLM REST API: クイックスタート

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PaLM API をすぐに試す場合は、curl コマンドを使用して REST API のメソッドを呼び出します。次の例は、各 API メソッドの呼び出しを示しています。curl コマンドごとに、モデル名と API キーを指定する必要があります。まだ取得していない場合は、API キーの取得ページをご覧ください。

"""
Add your API key and run this cell to set the PALM_API_KEY variable if
running in Colab.
(In a terminal you can just run PALM_API_KEY=<your API key>)
"""

import os
os.environ['PALM_API_KEY'] = ""

テキストを生成

generate_text メソッドを使用して、入力メッセージに対するモデルからのレスポンスを生成します。

!curl https://generativelanguage.googleapis.com/v1beta2/models/text-bison-001:generateText?key=$PALM_API_KEY \
    -H 'Content-Type: application/json' \
    -X POST \
    -d '{ \
        "prompt": { \
              "text": "Write a story about a magic backpack." \
              } \
          }'
{
  "candidates": [
    {
      "output": "Once upon a time, there was a young girl named Lily who loved to explore. She would spend hours wandering through the forest near her house, looking for new and exciting things. One day, Lily was exploring a particularly dense part of the forest when she came across a strange backpack. It was sitting on a rock, and it looked like it had been abandoned.\n\nLily picked up the backpack and examined it. It was made of a strange, silvery material that she had never seen before. There were no zippers or buttons, but the backpack seemed to be open. Lily reached inside, and she was surprised to find that it was full of all sorts of amazing things.\n\nThere were books that could tell her anything she wanted to know, tools that could fix anything she broke, and clothes that could keep her warm or cool no matter what the weather. Lily was amazed by the backpack's contents, and she knew that she had found something truly special.\n\nLily decided to take the backpack home with her, and she quickly discovered that it was even more magical than she had thought. The backpack could transport her to any place she wanted to go, and it could provide her with anything she needed. Lily used the backpack to travel the world, and she had many amazing adventures.\n\nOne day, Lily was using the backpack to explore a new planet when she came across a group of people who were in trouble. The people were being held captive by a cruel wizard, and Lily knew that she had to help them. She used the backpack to create a distraction, and then she rescued the people and led them to safety.\n\nThe people were so grateful to Lily for saving them, and they told her that she was a true hero. Lily was happy to have helped, and she knew that she would continue to use the backpack to help others in need.\n\nLily's magic backpack continued to accompany her on many more adventures. She used it to help people in need, to explore new worlds, and to learn about all sorts of amazing things. Lily's backpack was a constant source of joy and inspiration, and she was grateful for the many ways that it had enriched her life.",
      "safetyRatings": [
        {
          "category": "HARM_CATEGORY_DEROGATORY",
          "probability": "NEGLIGIBLE"
        },
        {
          "category": "HARM_CATEGORY_TOXICITY",
          "probability": "NEGLIGIBLE"
        },
        {
          "category": "HARM_CATEGORY_VIOLENCE",
          "probability": "NEGLIGIBLE"
        },
        {
          "category": "HARM_CATEGORY_SEXUAL",
          "probability": "NEGLIGIBLE"
        },
        {
          "category": "HARM_CATEGORY_MEDICAL",
          "probability": "NEGLIGIBLE"
        },
        {
          "category": "HARM_CATEGORY_DANGEROUS",
          "probability": "NEGLIGIBLE"
        }
      ]
    }
  ]
}

次の例では、generate_text メソッドのすべてのパラメータの値を指定しています。

!curl https://generativelanguage.googleapis.com/v1beta2/models/text-bison-001:generateText?key=$PALM_API_KEY \
        -H 'Content-Type: application/json' \
        -X POST \
        -d '{ \
            "prompt": { \
                  "text": "Give an example of a title for a story about a magic backpack.  \
                           Title: " \
                  }, \
            "safetySettings": [ \
                { \
                    "category": "HARM_CATEGORY_TOXICITY", \
                    "threshold": "BLOCK_ONLY_HIGH" \
                } \
            ], \
            "stopSequences": [ \
                "Title" \
            ], \
            "temperature": 1.0, \
            "candidate_count": 3, \
            "maxOutputTokens": 800, \
            "topP": 0.8, \
            "topK": 10 \
            }'
{
  "candidates": [
    {
      "output": "The Backpack of Holding",
      "safetyRatings": [
        {
          "category": "HARM_CATEGORY_DEROGATORY",
          "probability": "NEGLIGIBLE"
        },
        {
          "category": "HARM_CATEGORY_TOXICITY",
          "probability": "NEGLIGIBLE"
        },
        {
          "category": "HARM_CATEGORY_VIOLENCE",
          "probability": "NEGLIGIBLE"
        },
        {
          "category": "HARM_CATEGORY_SEXUAL",
          "probability": "NEGLIGIBLE"
        },
        {
          "category": "HARM_CATEGORY_MEDICAL",
          "probability": "NEGLIGIBLE"
        },
        {
          "category": "HARM_CATEGORY_DANGEROUS",
          "probability": "NEGLIGIBLE"
        }
      ]
    },
    {
      "output": "The Backpack of Holding",
      "safetyRatings": [
        {
          "category": "HARM_CATEGORY_DEROGATORY",
          "probability": "NEGLIGIBLE"
        },
        {
          "category": "HARM_CATEGORY_TOXICITY",
          "probability": "NEGLIGIBLE"
        },
        {
          "category": "HARM_CATEGORY_VIOLENCE",
          "probability": "NEGLIGIBLE"
        },
        {
          "category": "HARM_CATEGORY_SEXUAL",
          "probability": "NEGLIGIBLE"
        },
        {
          "category": "HARM_CATEGORY_MEDICAL",
          "probability": "NEGLIGIBLE"
        },
        {
          "category": "HARM_CATEGORY_DANGEROUS",
          "probability": "NEGLIGIBLE"
        }
      ]
    },
    {
      "output": "The Backpack of Holding",
      "safetyRatings": [
        {
          "category": "HARM_CATEGORY_DEROGATORY",
          "probability": "NEGLIGIBLE"
        },
        {
          "category": "HARM_CATEGORY_TOXICITY",
          "probability": "NEGLIGIBLE"
        },
        {
          "category": "HARM_CATEGORY_VIOLENCE",
          "probability": "NEGLIGIBLE"
        },
        {
          "category": "HARM_CATEGORY_SEXUAL",
          "probability": "NEGLIGIBLE"
        },
        {
          "category": "HARM_CATEGORY_MEDICAL",
          "probability": "NEGLIGIBLE"
        },
        {
          "category": "HARM_CATEGORY_DANGEROUS",
          "probability": "NEGLIGIBLE"
        }
      ]
    }
  ]
}

各パラメータ値の意味は次のとおりです。

  • safetySettings: 有害性の安全性しきい値を下げて、可能性の高い有害な出力のみをブロックします。
  • stopSequences: 停止シーケンスを使用して、Title の次のインスタンスで出力を停止することで、タイトルを 1 つだけ生成します。
  • temperature: レスポンスを生成するときに温度を 1.0 に設定します。
  • candidate_count: レスポンス候補を 3 つだけ返します。
  • maxOutputTokens: 最大 800 個のトークンを返します。
  • topP: モデルから返されたトークンの上位 80% のみを考慮します。
  • topK: サンプリング時に上位 10 個のトークンを考慮します。

これらのパラメータの詳細については、API リファレンスの generateText メソッドをご覧ください。

メッセージを生成

generateMessage メソッドを使用して、MessagePrompt が入力されたモデルからレスポンスを生成します。

!curl https://generativelanguage.googleapis.com/v1beta2/models/chat-bison-001:generateMessage?key=$PALM_API_KEY  \
  -H 'Content-Type: application/json' \
  -X POST \
  -d '{ \
      "prompt": {"messages": [{"content":"hi"}]} \
      }'
{
  "candidates": [
    {
      "author": "1",
      "content": "Hi! How can I help you today?"
    }
  ],
  "messages": [
    {
      "author": "0",
      "content": "hi"
    }
  ]
}

次の例は、パラメータの値が異なる呼び出しを示しています。

!curl  https://generativelanguage.googleapis.com/v1beta2/models/chat-bison-001:generateMessage?key=$PALM_API_KEY  \
        -H 'Content-Type: application/json' \
        -X POST \
        -d '{ \
            "prompt": {"messages": [{"content":"hi"}]}, \
            "temperature": 0.1, \
            "candidate_count": 1, \
            "topP": 0.8, \
            "topK": 10}'
{
  "candidates": [
    {
      "author": "1",
      "content": "Hi! How can I help you today?"
    }
  ],
  "messages": [
    {
      "author": "0",
      "content": "hi"
    }
  ]
}

各パラメータ値の意味は次のとおりです。

  • temperature: レスポンスを生成するときに温度を 0.1 に設定します。
  • candidate_count: レスポンスの候補を 1 つだけ返します。
  • topP: モデルから返されたトークンの上位 80% のみを考慮します。
  • topK: サンプリング時に上位 10 個のトークンを考慮します。

これらのパラメータの詳細については、API リファレンスの generateMessage メソッドをご覧ください。

テキストを埋め込む

embedText メソッドを使用して、入力メッセージを指定してモデルからエンベディングを生成します。

!curl https://generativelanguage.googleapis.com/v1beta2/models/embedding-gecko-001:embedText?key=$PALM_API_KEY \
  -H 'Content-Type: application/json' \
  -X POST \
  -d '{"text": "say something nice!"}'
{
  "embedding": {
    "value": [
      0.0011238843,
      -0.040586308,
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      0.015497498,
      0.04383781,
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      0.031339817,
      -0.0042566974,
      -0.024129443,
      -0.023050068,
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      0.03501345,
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  }
}

メッセージ トークンをカウントする

countMessageTokens メソッドを使用して、メッセージ プロンプト文字列に対してモデルのトークナイザを実行し、トークン数を取得します。

!curl https://generativelanguage.googleapis.com/v1beta2/models/chat-bison-001:countMessageTokens?key=$PALM_API_KEY \
    -H 'Content-Type: application/json' \
    -X POST \
    -d '{ \
        "prompt": { \
            "messages": [ \
                {"content":"How many tokens?"}, \
                {"content":"For this whole conversation?"} \
            ] \
        } \
    }'
{
  "tokenCount": 23
}

モデルの取得

get メソッドを使用して、バージョン、表示名、入力トークンの上限など、特定のモデルに関する情報を取得します。

curl https://generativelanguage.googleapis.com/v1beta2/models/text-bison-001?key=$PALM_API_KEY
{
  "name": "models/text-bison-001",
  "version": "001",
  "displayName": "Text Bison",
  "description": "Model targeted for text generation.",
  "inputTokenLimit": 8196,
  "outputTokenLimit": 1024,
  "supportedGenerationMethods": [
    "generateText"
  ],
  "temperature": 0.7,
  "topP": 0.95,
  "topK": 40
}

モデルの一覧表示

list メソッドを使用して、PaLM API で利用可能なすべてのモデルを一覧表示します。

curl https://generativelanguage.googleapis.com/v1beta2/models?key=$PALM_API_KEY
{
  "models": [
    {
      "name": "models/chat-bison-001",
      "version": "001",
      "displayName": "Chat Bison",
      "description": "Chat-optimized generative language model.",
      "inputTokenLimit": 4096,
      "outputTokenLimit": 1024,
      "supportedGenerationMethods": [
        "generateMessage",
        "countMessageTokens"
      ],
      "temperature": 0.25,
      "topP": 0.95,
      "topK": 40
    },
    {
      "name": "models/text-bison-001",
      "version": "001",
      "displayName": "Text Bison",
      "description": "Model targeted for text generation.",
      "inputTokenLimit": 8196,
      "outputTokenLimit": 1024,
      "supportedGenerationMethods": [
        "generateText"
      ],
      "temperature": 0.7,
      "topP": 0.95,
      "topK": 40
    },
    {
      "name": "models/embedding-gecko-001",
      "version": "001",
      "displayName": "Embedding Gecko",
      "description": "Obtain a distributed representation of a text.",
      "inputTokenLimit": 1024,
      "outputTokenLimit": 1,
      "supportedGenerationMethods": [
        "embedText"
      ]
    }
  ]
}