conversational ai for real estate

Conversational AIfor Real Estate

Agenda i

A whole lot a bot talk

AI is not magic 🎩

Bot deep learning models 💾

Connecting external data and APIs 🔌

Bot builder’s are too broad

Conversational interfaces

Structurely bot-chitecture

Bot Talk i

Bots are 🔥What's a bot?

It’s like Siri, where you can use an app by just messaging or talking to it

Why would I use a bot?

Its a more natural, on-demand, accessible and efficient way of using an app

Gartner thinks by 2020, smart agents will facilitate 40% of all mobile interactions, and the post-app era will begin to dominate

4 Types of Bots i

A chatbot carries on a 2 way conversation

A personal assistant bot answers questions and responds to commands

A notification bot posts in a chatroom, glorified RSS feed

A command line bot saves you from alt-tabbing to the browser

Like Holmes

Like Siri

Like Inman’s Bot

Like /commands in Slack

NOT DELIVERED

We’re here talk, so ask us anything! Message us below or from your favorite app

Brokerage USA

Brokerage USACONTEXT

User behavior & event data previousconversation history

I'm looking for a 2 bed near Bloomington between 200k and 250k

INTENT

A goal the user wants to accomplish

Were there any other features you were looking for in a home?

INTENT

PROMPT

Questions that ask for user data in slots

I'd really like a bedroom and extra storage in the lower level

INTENT

PROMPT

Data needed to execute on a specific intent

Sure! I found 39 homes I think you’ll like

Could I catch your email so I can send you these listings?

INTENT

PROMPT

EXECUTION

Function performed by application using contextual or given slot data for a specific intent

Sure, its becky@buyer.com

INTENT

PROMPT

EXECUTION

Business application data required to conclude

Great Becky! I’ll have those listings to you ASAP

INTENT

PROMPT

EXECUTION

CONCLUSION

Business application data required to conclude

Invokes a notification or service for the agent

The Problem With Bot-Builders i

Looking for 3bds 2bths house w/ finshd w/o LL bloomington mn

I’m looking for a home with a finished walkout basement in bloomington, MN with 3 bedrooms and 2 bathrooms

No sentences are the same in real estate, even if they are trying to accomplish the same thing

Bot builders rely on deep learning for knowledge in domains where they don’t have data

There’s simply too much real estate industry specific jargon for broad deep learners to understand effectively

AI is Not Magic i

Soooo how do you make AI more real estate specific?

Lots and lots of hand trained data

Here’s an example of our data training console 💻

Evolution of Holmes i

It was built with wit.ai and other bot builders

How did you build Holmes V1?

How about V2?

In V2 we are adding CRFs, XGBoost, and some deep learning NN’s like LSTM

Bot-chitecture 🤖 i

How we built custom real estate chat bots

Natural Language Understanding

Preprocessing

Intent classification

Entity extraction

Response composers

Machine learning

Deep learning

Executions

Preprocessing i

Standardizing abbreviations and jargon

bedroom

Neural network vector embedding of words

bath bthr

bathroom

I'm looking for a 2 bd near Bloomington btwn 200k and 250k

Sure! I found 39 homes I think you’ll like Bot

Brokerage USA

User I'm looking for a 2 bedroom near Bloomington between 200k and 250k

After standardizing

Preprocessing i

Stemming

Removing stop words

moving move

r move

Reduces a word to its base, stem, or root i

Removes most common “meaningless” wordsi

Ex: “in”, “for”, “a”

These techniques should be used with caution

Brokerage USA

After standardizing

I'm look for a 2 bedroom near Bloomington between 200k and 250k

After stemming

Brokerage USA

After standardizing

I'm look for a 2 bedroom near Bloomington between 200k and 250k

After stemming

I'm look 2 bedroom near Bloomington between 200k 250k

Stop words removed

for, a, and

Intent Classification i

n-gram feature generationThis is a

sentence.1-gram

(unigrams)

2-gram (bigrams)

3-gram (trigrams)

This is a sentence

This is is a a sentence

This is a

is a sentence

tree based machine learning algorithms trained on n-gram indicator features

Brokerage USA

UserPreprocessed text

i'm look 2 bedroom near bloomington between 200k 250k

n-gram features (n=1, 2, 3)

i’m look look 2 i’m look 22

bedroom2 bedroom

Intent classified by boosting or random

forestintent = “search for home”

St on 123 me Show

Entity Extraction i

Conditional Random Fields (CRFs)

Applies arbitrary labels to a sequence of texti

Example: address extraction

info Main

0STREET-NUMB-STREET-NAMEI-STREET-NAME

Brokerage USA

User Intent classifiedintent = “search for

home”

CRF labelling scheme applied

• bedrooms = 2• minimum price = 200,000

• maximum price = 250,000

Entity Extraction i

Neural network with LSTM for extracting subtle features

Neural network architecture capable of learning long-term dependencies between wordsi

Image source: http://colah.github.io/posts/2015-08-Understanding-LSTMs/

Brokerage USA

Contains property feature #52: “Finished

basement”

Entity Extraction i

Neural network with LSTM for extracting subtle features

Neural network architecture capable of learning long-term dependencies between wordsi

“I’d really like a bedroom and extra storage in the lower level.”

“Finished basement”

Executions i

Recommendation enginePredictive days on market

modelAutomated valuation

modelPublic data

lookup

Market stats

Points of interest…

Machine learning

External APIs

Internal databases

Brokerage USA

Recommendation engine is triggered to

execute• bedrooms = 2• minimum price = 200,000

• maximum price = 250,000

• finished basement• storage space

Composers i

Humanizing a bot, but not too much

Stochastic structured responses

All responses are generated randomly

from pre-defined messages or template

messages

Structured vs. statistical composers

Markov chains,

seq2seq

Difficult to train and rely completely on the quality of training data

No machine learning needed

Brokerage USATypically replies instantly

Holmes 〉

Type a message….

Home (1) ManageAI is about the

illusion of intelligence

Holmes 〉

Type a message….

Home (1) ManageHow many bedrooms at 123 Main

AI is about the illusion of

intelligence

Holmes 〉

Type a message….

Home (1) ManageHow many bedrooms at 123 Main

intelligenceThere are 3 bedrooms at 123 Main St. Ames,

What was the latest assessed value?

Holmes 〉

Type a message….

Home (1) Manage

There are 3 bedrooms at 123 Main St. Ames, IA.

How many bedrooms at 123 Main St?

intelligence

The latest assessed value I have was $396800 in 2014.

Holmes 〉

Type a message….

Home (1) Manage

intelligence

Holmes 〉

Type a message….

Home (1) Manage

intelligence

A good bot doesn’t need to pass the

turing test

Personality is still important

Tell me a joke!

Holmes 〉

Type a message….

Home (1) Manage

intelligence

turing test

Tell me a joke!Sure! Uh, why did the bot ask for

Holmes 〉

Type a message….

Home (1) Manage

intelligence

turing test

food?Idk. Why?

Holmes 〉

Type a message….

Home (1) Manage

intelligence

turing test

food?Idk. Why?

Because it needed a byte! Lmao

Holmes 〉

Type a message….

Home (1) Manage

intelligence

turing test

food?Idk. Why?

Because it needed a byte! Lmao

How a-bot that one?

Holmes 〉

Type a message….

Home (1) Manage

intelligence

turing test

Thanks for listening! ✌️

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