EVALITA 2009: Loquendo Spoken Dialog System
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1 EVALITA 2009: Loquendo Spoken Dialog System Paolo Baggia Director of International Standards Speech Luminary at SpeechTEK 2009 Evalita Workshop December 12 th, 2009 Evalita Workshop 2009 Paolo Baggia 11
2 Company Profile Privately held company (fully owned by Telecom Italia), founded in 2001 as spin-off from Telecom Italia Labs, capitalizing on 30yrs experience and expertise in voice processing. Global Company, leader in Europe and South America for award-winning, high quality voice technologies (synthesis, recognition, authentication and identification) available in 26 languages and 62 voices. Multilingual, proprietary technologies protected over 100 patents worldwide Financially robust, break-even reached in 2004, revenues and earnings growing year on year London Munich Growth-plan investment approved for the evolution of products and services. Offices in New York. Headquarters in Torino, local representative sales offices in Rome, Madrid, Paris, London, Munich New York Paris Madrid Torino Rome Flexible: About 100 employees, plus a vibrant ecosystem of local freelancers. Evalita Workshop 2009 Paolo Baggia 2
3 Overview A Bit of Context Loquendo Spoken Dialog System Loquendo VoxNauta VoiceXML/CCXML platform SDS Ingredients Grammar Handling Evaluation Evalita Workshop 2009 Paolo Baggia 3
4 A Bit of Context Evalita Workshop 2009 Paolo Baggia 4
5 A Brief History of Speech Technologies Von Kempelen's Talking Machine Radio Rex BL's Voder BL's Audrey Dictation systems Dictation Industry Widespread use of HMMs NLU systems Spoken dialog Industry MultiModal Conversational systems FFT, cepstrum, DTW, TTS DARPA SUR program starts by Roberto Pieraccini Isolated Words Hidden Markov Models Continuous Speech DARPA Recognition Resource Management Dialog DARPA COMMUNICATOR Speech Understanding DARPA ATIS Evalita Workshop 2009 Paolo Baggia 5
6 The (r)evolution of VoiceXML W3C Voice Browser Workshop 1998 W3C charters Voice Browser WG 1999 VoiceXML Forum Birth 2000 VoiceXML 1.0 Released W3C charters Multimodal Interaction WG By AT&T, IBM, Lucent, Motorola, 2002 SALT Forum Birth By Cisco, Comverse, Intel, Microsoft, Philips, SpeechWorks, 2004 SSML 1.0 SRGS W3C 1.0 Rec VoiceXML W3C 2.0 Rec W3C Rec 2007 SISR 1.0 VoiceXML W3C Rec 2.1 W3C Rec 2008 EMMA 1.0 W3C Rec PLS 1.0 W3C REC 2009 Preparing to announce VoiceXML 1.0 Friday Feb. 25 th, 2000 Lucent, Naperville, Illinois Left to right: Gerald Karam (AT&T), Linda Boyer (IBM), Ken Rehor (Lucent), Bruce Lucas (IBM), Pete Danielsen (Lucent), Jim Ferrans (Motorola), Dave Ladd (Motorola). Evalita Workshop 2009 Paolo Baggia 6
7 Speech Interface Framework in 2000 (by Jim Larson) Semantic Interpretation for Speech Recognition (SISR) N-gram Grammar ML Speech Recognition Grammar Spec. (SRGS) EMMA Natural Language Semantics ML VoiceXML 2.1 VoiceXML 2.0 ASR Language Understanding DTMF Tone Recognizer Context Interpretation World Wide Web Pronunciation Lexicon Specification (PLS) Dialog Manager User TTS Pre-recorded Audio Player Language Generation Media Planning Telephone System Speech Synthesis Markup Language (SSML) Reusable Components Call Control XML (CCXML) Evalita Workshop 2009 Paolo Baggia 7
8 Speech Interface Framework - End of 2009 (by Jim Larson) Semantic Interpretation for Speech Recognition (SISR) N-gram Grammar ML Speech Recognition Grammar Spec. (SRGS) EMMA 1.0 Natural Language Semantics ML VoiceXML 2.1 VoiceXML 2.0 Language ASR Understanding DTMF Tone Recognizer Context Interpretation World Wide Web Pronunciation Lexicon Specification (PLS) Dialog Manager User TTS Pre-recorded Audio Player Language Generation Media Planning Telephone System Speech Synthesis Markup Language (SSML) Reusable Components Call Control XML (CCXML) Evalita Workshop 2009 Paolo Baggia 8
9 Architectural Changes Traditional (proprietary) architecture User ASR / DTMF TTS / Audio Speech Applic. Proprietary SCE Proprietary platform VoiceXML architecture.grxml/.gram,.pls User ASR / DTMF TTS / Audio VoiceXML Browser.vxml HTTP Web Applic. VoiceXML platform.ssml,.wav/.mp3,.pls Evalita Workshop 2009 Paolo Baggia 9
10 The Landscape Changed! VoiceXML changed the landscape of speech application development From proprietary to standard-based speech applications Before After Proprietary platforms (HW & SW) Proprietary applications (by proprietary SCE) Mainly DTMF and pre-recorded prompts First attempts to add speech into IVR Standard VoiceXML platforms Standards for Speech Technologies Standard tools for VoiceXML applications Integration of DTMF and ASR Still predominance of DTMF, but more and more speech applications VoiceXML Key Features: It takes the web paradigm to the core of speech applications development It is a powerful abstraction Easy to author Evalita Workshop 2009 Paolo Baggia 10
11 Loquendo Spoken Dialog System Evalita Workshop 2009 Paolo Baggia 11
12 VoxNauta Internal Architecture Evalita Workshop 2009 Paolo Baggia 12
13 Loquendo SDS Ingredients Dialog Implementation: VoiceXML mostly static application (JSP for dynamic pages) VoiceXML mixed initiative for multi slot input Barge-in always present (to interrupt prompts and shift focus) Data in mysql DB Speech Grammar Development: SRGS grammars no SLM Mostly dynamic grammars (JPS generated) Wild exploitation of Garbage Rule (of SRGS) Prompting: Pure TTS, untuned Development / Tuning: 1 week Evalita Workshop 2009 Paolo Baggia 13
14 Speech Grammar with Garbage Rules Typical Garbage Topologies: Garbage Content part (Well I m leaving er sorry) from Boston Prefix Content part Garbage at 5pm (please) Postfix Garbage Content part Garbage (I d like to travel) from Rome to Venice (please) An attempt to explore limits/advantages in conversational dialogs Evalita Workshop 2009 Paolo Baggia 14
15 Loquendo SDS Grammar Encapsulation Robust Domain Concept Grammars: For Brands, Categories, Codes, Names Component Grammars: First level of composition of domain concepts Combinatorial Grammars: Combination of Components in different orders Insertion of Garbage Rules Evalita Workshop 2009 Paolo Baggia 15
16 Loquendo SDS Evaluation Short Dialogs: Mixed initiative and flexible grammars were effective Task Success Rate: Very high for implemented task Some Tasks were not Implemented: Initial requirements a bit vague Very precise testing scenarios No last minute tuning of Loquendo SDS Evalita Workshop 2009 Paolo Baggia 16
17 Final Evaluation Table Task UniNA Loquendo UniTN Identify representative Duratio n (turns) 1.9 ±0.4 Tsr (corr/req) 100.0% (19/19) Duration (turns) 2.4 ±0.8 Tsr (corr/req) 95.0% (19/20) Duration (turns) 3.1 ±0.5 Tsr (corr/req) 90.5% (19/21) Ask customer detail 2.0 ± % (5/6) 2.3 ± % (8/9) 3.4 ± % (12/22) List orders 2.5 ± % (0/8) 2.0 ± % (4/5) 3.0 ± % (3/4) List customers 2.0 ± % (2/4) 2.0 ± % (0/8) 3.0 ± % (2/3) New order 4.6 ± % (4/11) 4.3 ± % (9/21) 7.5 ± % (12/19) List products - other 2.0 ± % (0/4) 3.0 ± % (2/8) 3.8 ± % (4/9) Search single product 2.3 ± % (5/9) 2.8 ± % (14/18) 3.5 ± % (11/14) Overall (corr/req) % (45/77) % (56/90) % (73/115) Evalita Workshop 2009 Paolo Baggia 17
18 THANK YOU for clarifications or questions: Evalita Workshop 2009 Paolo Baggia 18
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