Amazon Lexは、Lambdaのコールドスタートのように、一定時間リクエストがないとボットの応答に数秒の遅延が発生します

{
	"Version": "2012-10-17",
	"Statement": [
		{
			"Effect": "Allow",
			"Action": "lex:RecognizeText",
			"Resource": "arn:aws:lex:*:012345678901:bot-alias/*/*"
		}
	]
}

import boto3
import json
import time

def lambda_handler(event, context):
    lex_client = boto3.client('lexv2-runtime')

    bot_id = "XXXXXXXXXX" # ボットID
    bot_alias_id = "TSTALIASID" # エイリアスID

    locale_id = "ja_JP"
    session_id = 'test-session-001'  # セッションIDは適当

    start_time = time.time()  # 開始時間を記録
    try:
        # RecognizeText APIを呼び出し
        response = lex_client.recognize_text(
            botId=bot_id,
            botAliasId=bot_alias_id,
            localeId=locale_id,
            sessionId=session_id,
            text='Hello'
        )

        end_time = time.time()  # 終了時間を記録
        execution_time = end_time - start_time  # 実行時間を計算
        print(f'execution_time:{execution_time:.4f} seconds')

        return {
            'statusCode': 200,
            'message': 'Success',
            'execution_time': f'{execution_time:.4f} seconds'
        }

    except Exception as e:
        print(f"Error: {str(e)}")
        return {
            'statusCode': 500,
            'message': 'Error'
        }

$ aws lexv2-runtime recognize-text \
--bot-id XXXXXXXXXX \
--bot-alias-id TSTALIASID \
--locale-id ja_JP \
--session-id test-session-001 \
--text "Warm up request" \
--region ap-northeast-1

// 出力結果
{
    "sessionState": {
        "dialogAction": {
            "type": "Close"
        },
        "intent": {
            "name": "FallbackIntent",
            "slots": {},
            "state": "Failed",
            "confirmationState": "None"
        },
        "sessionAttributes": {},
        "originatingRequestId": "83925dd1-628e-4cf8-8fef-0372fb93ca33"
    },
    "interpretations": [
        {
            "intent": {
                "name": "FallbackIntent",
                "slots": {},
                "state": "Failed",
                "confirmationState": "None"
            },
            "interpretationSource": "Lex"
        },
        {
            "nluConfidence": {
                "score": 0.47
            },
            "intent": {
                "name": "dummy",
                "slots": {}
            },
            "interpretationSource": "Lex"
        }
    ],
    "sessionId": "test-session-001"
}