How to Train a Speech API
David Thomson
Principal Architect
AT&T Research Labs
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
Outline
•  API strategy
•  Why do we need hints?
•  Generic hints flavors
begin
PREFIX
ALTGRAM
•  Use cases
•  ASR = Automatic Speech Recognition
•  API = Application Programming Interface
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
GENERIC
end
Challenge: Make ASR Development Easy
Historical obstacles:
• Specialized knowledge
• Few standards
• Often undocumented
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
The
AT&T
Speech
API site
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
The AT&T Developer Program
Advertising
Device
Capabilities
In-App
Messaging
AT&T
U-verse
MMS
SMS
Payment
Speech
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
WMSSP
Security Gateway
Internet
The AT&T Speech API
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
Watson
Payment
Ads
SMS
AT&T Labs Speech Research
• First voice synthesizer in 1939
• 1+ million R&D hours in language
technologies over 35 years
• 850+ patents, 3000+ technical papers
• Hundreds of large-scale speech
services for Consumer and Enterprise
• Deep subject matter experts
(1939) AT&T
speech synthesizer
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
Watson software
Inside Watson
Core
=
Watson
Package
Acoustic model
Language model
Pronunciation model
Punctuate/capitalize
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
Plug-ins
API usage
#Send wave file to Watson:!
curl -H content-type:audio/wav \!
!-H accept:prettyjson --data-binary \!
[email protected] \!
!http://wmssp.research.att.com/
!dictation.iphone/asr!
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
Speech SDK
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
Speech SDK – code example
(IBAction) listen: (id) sender { ATTSpeechService* speechService = [ATTSpeechService sharedSpeechService] [speechService startServiceWithURL: self.mySpeechURL withAudioData: nil];"
}"
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
Constraint: context-free grammar (CFG)
for
what is
my
in
Please
tell me
Uh,
my
savings
checking
savings account
*
*
give me
account.
checking
*
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
balance.
Sending a grammar inline to the API
{…
…}
Grammar
Text
Security
Audio
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
Watson
Inline grammar request
Content-Type: multipart/x-srgs-audio
SRGS
grammar
Audio
Content-Type: application/srgs+xml
<grammar root="top" xml:lang="en-US">
…
</grammar>
Content-Type: audio/wav
RIFF…WAVEfmt…..#%*^ audio-data-goes-here………………………………… ……………. …
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
Pronunciations
• 
• 
• 
• 
New words
Unusual names
Acronyms
Foreign words
Lexicon
SRGS grammar
Audio
Content-Type: multipart/x-srgs-audio
Content-Type: application/pls+xml
<lexicon alphabet=“sampa”>
<lexeme>
<grapheme>ca$h</grapheme>
</phoneme>k { S</phoneme>
</lexeme>
</lexicon>
Content-Type: application/srgs+xml
<grammar root="top" xml:lang="en-US">
…
</grammar>
Content-Type: audio/wav
RIFF…WAVEfmt…..#%*^ audio-datagoes-here- ………… ……………. …
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
CFGs vs. SLMs
Context-Free Grammars
(CFGs)
channel
0
volume
Statistical Language
Models (SLMs)
up
1
down
day/0.5
2
0
good
1
2
dog/0.4
job/0.1
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
3
4
CFGs vs. SLMs
Context-Free Grammars
(CFGs)
•  Hand-crafted rules
Statistical Language
Models (SLMs)
•  Data-driven
• 
Very high-accuracy
• 
High-accuracy
• 
Easy to assemble
• 
Complex to assemble
• 
Finite phrases
• 
Natural language
• 
Control applications
• 
Dictation applications
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
Context: Optimized for the domain
No problem,
I ll get a table
Generic
two cheese pizzas
Sorry I m
running late
BusinessSearch
closest papa s pizza
SMS
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
Detail
Preview
Voicemailto-text
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
TV Search – U-verse Easy Remote
•  Listing search
•  In App Store
What comedy
shows are on
tonight?
•  Updated daily
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
AT&T Speech API contexts in production
• Gaming
• Social Media
• Web Search
• Business Search
• Voicemail-to-text
• SMS
• Question and Answer
• TV
• Generic
• Grammar List (Inline)
• Generic with Hints
• Text-to-Speech
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
Alpha APIs at foundry.att.com
• Connected car
Embedded
Watson
Watson
Application: Dialog & userServices
models
experience
connectors
Operating System
Processor
Headboard
• Virtual assistant
• Voice biometrics
• Language translation
• Multilingual generic
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
Recognized text
Speak message
Press mic button
Transcribe by V-Soft
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
Normal transcription
Spoken:
“Gary, when you get this,
stop by my office please.
I need to make sure that
the report is going to be
finished by 9:00 tomorrow.”
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
Out-of-domain words
Spoken:
“'Twas brillig, and the slithy toves
Did gyre and gimble in the wabe:
All mimsy were the borogoves,
And the mome raths outgrabe.”
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
Generic with hints – series & parallel
begin
PREFIX
(CFG)
GENERIC
(SLM)
GENERIC
(SLM)
begin
end
ALTGRAM
(CFG)
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
end
Generic with hints - combinations
begin
PREFIX
(CFG)
GENERIC
(SLM)
ALTGRAM
(CFG)
begin
GENERIC
(SLM)
end
ALTGRAM
(CFG)
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
end
Example hints
• 
• 
• 
• 
• 
• 
• 
Products
Contact names
Locations – Streets, business names, …
Telephone numbers
Company lingo, acronyms, business terms
Made-up words
Car/phone/appliance control
© 2014 AT&T Intellectual Property. All rights reserved. AT&T, the AT&T logo and all other marks contained herein are trademarks of AT&T Intellectual Property and/or AT&T affiliated companies. All other marks contained herein are
the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
Example API call
$ curl -v -s -H 'Accept:prettyjson' \
-H 'X-Arg: ClientApp=DavidsHotels' \
-H 'X-Arg:GrammarPenaltyLoop=0' \
-H 'Content-Type:multipart/x-srgs-audio' \
-F '[email protected];type=application/pls+xml' \
-F '[email protected];type=application/srgs+xml' \
-H "MIME-Version: 1.0" --data-binary "@$vacancy.wav" \
"http://developer.att.com/ism.inline_grammar.eval/asr"
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
Example JSON response
"Recognition”:
{ "NBest": [
{ "Confidence": 0.86,
"Grade": "accept",
"Hypothesis": ”Rooms for August 29th",
"WordScores": [0.8, 0.579, 0.899, 0.75],
}
"ResponseId": "cb62cdb3a0c8f206f2baf6”,
}
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
Generic with grammar prefix
begin
PREFIX
(CFG)
GENERIC
(SLM)
end
•  “Text David, I’ll meet you at the restaurant.”
•  “Where can I buy birthday supplies?”
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
Generic with parallel alternate grammar
begin
GENERIC
(SLM)
ALTGRAM
(CFG)
•  “Please call me when you get this”
•  “Buy Casey’s present”
•  “Power off”
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
end
Third-party app
• 
• 
• 
• 
Recognizes product names
Searches ebay
Built by freelance developer
Effort: 10 hours end-to-end
Sergey Garazha
Mobile developer
Rostov-on-Don, Russia
© 2014 AT&T Intellectual Property. All rights reserved. AT&T, the AT&T logo and all other marks contained herein are trademarks of AT&T Intellectual Property and/or AT&T affiliated companies. All other marks contained herein are
the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
Hints – Grammar for unknown words
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
Prefix and parallel combination
begin
PREFIX
(CFG)
GENERIC
(SLM)
end
ALTGRAM
(CFG)
Virtual assistant:
“What time is it?”
“Remind me at 4:20, pick up Jeremy from school.”
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
Generic with looped grammar
begin
GENERIC
(SLM)
ALTGRAM
(CFG)
“Order a set of R27b framulators.”
“Do you have watermelon in stock?”
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
end
Generic with Hints: x-grammar-loop
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
Mixing n-grams with unigrams
3-gram:
begin
P(t1,…,tN) ≅ Πn P(tn|tn-1,tn-2)
= P(t1) P(t2|t1) P(t3|t2,t1) P(t4|t3,t2)…
Mixed 3-gram and unigram:
P(t1,…,tN) ≅ P(t1) P(t2|t1) P(t3|t2,t1) P(t4|t3,t2)…
P(t10|t9,t8) P(t11) P(t12|t11,t10)…
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
GENERIC
(SLM)
ALTGRAM
(CFG)
end
Use case: Sales support
begin
PREFIX
(CFG)
GENERIC
(SLM)
end
(Grammar elements are underlined)
SRGS: •  “Book a flight”
Hints: •  “Meeting notes: Customer likes the price.”
SRGS
Generic
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
Use case: Calendar
GENERIC
(SLM)
begin
end
ALTGRAM
(CFG)
SRGS: •  “Set alarm for 5:00 a.m.”
SRGS: •  “Send meeting invite to my group”
Generic: •  “Remember to pick up scout uniforms”
© 2014 AT&T Intellectual Property. All rights reserved. AT&T, the AT&T logo and all other marks contained herein are trademarks of AT&T Intellectual Property and/or AT&T affiliated companies. All other marks contained herein are
the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
Use case: Automotive
PREFIX
(CFG)
begin
GENERIC
(SLM)
end
ALTGRAM
(CFG)
Generic:
Parallel:
Parallel:
Series:
Series:
• 
• 
• 
• 
• 
“What is there to do nearby?”
“Radio on”
“Directions to the nearest gas station”
“Play music by Maroon 5”
“Send email to Ron, I’ll meet you at 5:00
© 2014 AT&T Intellectual Property. All rights reserved. AT&T, the AT&T logo and all other marks contained herein are trademarks of AT&T Intellectual Property and/or AT&T affiliated companies. All other marks contained herein are
the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
Use case: Virtual Assistant
begin
PREFIX
(CFG)
GENERIC
(SLM)
end
ALTGRAM
(CFG)
Generic: •  “What time does the Superbowl start?”
Parallel: •  “Call Gary Jackson”
Series: •  “Search for news on riots in Egypt”
© 2014 AT&T Intellectual Property. All rights reserved. AT&T, the AT&T logo and all other marks contained herein are trademarks of AT&T Intellectual Property and/or AT&T affiliated companies. All other marks contained herein are
the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
Use case: ivee Sleek
•  Uses AT&T Hints API
•  Dual beam-forming mics
•  Temperature/light sensors
© 2014 AT&T Intellectual Property. All rights reserved. AT&T, the AT&T logo and all other marks contained herein are trademarks of AT&T Intellectual Property and/or AT&T affiliated companies. All other marks contained herein are
the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
ivee features
Alarms - e.g. "Wake me up at 6:30am.”
Time - e.g. "What time is it in Hong Kong?"
Reminders - e.g. "Remind me to pick up the kids at 2:45."
Controls Devices - e.g. "Set the thermostat to 71 degrees."
News - e.g. "What's the weather like in New York Friday?”
Sleep Sounds - e.g. "Play ocean waves for 15 minutes.”
Bed Time Stories - e.g. “Read me a bed time story.”
FM Radio - e.g. "Tune the radio to 102.7 FM.”
© 2014 AT&T Intellectual Property. All rights reserved. AT&T, the AT&T logo and all other marks contained herein are trademarks of AT&T Intellectual Property and/or AT&T affiliated companies. All other marks contained herein are
the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
Homework
• Sign up for a free account at developer.att.com
• Record a wave file, send to the generic context
• Add speech to your current or next project
© 2014 AT&T Intellectual Property. All rights reserved. AT&T, the AT&T logo and all other marks contained herein are trademarks of AT&T Intellectual Property and/or AT&T affiliated companies. All other marks contained herein are
the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
Q&A
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the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.
Thank You
© 2014 AT&T Intellectual Property. All rights reserved. AT&T, the AT&T logo and all other marks contained herein are trademarks of AT&T Intellectual Property and/or AT&T affiliated companies. All other marks contained herein are
the property of their respective owners. Information contained herein is not an offer, commitment, representation or warranty by AT&T and is subject to change. Mention of a specific company or entity is not an endorsement by AT&T.