Amazon Lex Limits

Posted By : Vanshika Madan | 29-Jun-2018

Amazon Lex which is used to create various type of conversational bot has a certain type of limits which one should be aware of it when using it. Limits are divided into categories: 

 

1- General Limit:- Only US English language is supported by Amazon lex which means bots are trained to understand only US English.

 

2- RunTime Limits:-

a) User voice input can be up to 15 seconds long. 

b) User text input size can be up to 1024 Unicode characters.

c) Input size provided to a lambda function can be up to 12KB

d) Output size coming from lambda function can be up to 25KB including session attributes of up to 12KB.

 

3- Model Building Limits:-

a) Bot Limits:-

I- Maximum 20,000 characters are allowed for all utterances in a bot.

II- Maximum synonym values in a slot type can be up to 10,000.

III- A bot can have maximum 50,000 slot types.

IV- All resource type can have maximum 100 versions.

V- It is not allowed to have same name intent and a slot. They both should be unique within a bot.

VI Maximum intents within a bot can be up to 100 and up to 5 aliases for a bot.

 

b) Intent Limits:- 

I- At the time of creation slot and intent names are case-insensitive. For example:- If you create an intent ShoppingIntent, then you will get an error if you create another intent shoppingIntent. But at the time of accessing these resources, they are case sensitive.

II- Sample utterances in an intent can be up to 1,500

III- An utterance can refer to zero or more slot names and can refer to a slot name only once.

IV- Maximum limit of sample utterance in an intent is 1500 but proving few utterances contribute to better understanding of inputs outside the set.

V-  Only five message group are allowed for each message and total 15 messages in all message group for a message.

VI- Message group only used for conclusion statement and follow up prompt. 

VI- 1000 intents are allowed per AWS account.

 

c) Slot Limits:- 

I- A custom slot type can have maximum 10,000 enumeration values.

II- It is not allowed to add synonyms in built-in slot types.

III At the time of providing synonyms include both upper and lower case synonym in the slot type

 

So these are some of the limits currently in Amazon Lex which we should be aware of.

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Vanshika Madan

Vanshika is focused and hardworking person. She aims at achieving new opportunities and secure a position to contribute her skills for growth of the organisation and her professional career.

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