The Conversational User Interface

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1 The Conversational User Interface Ronald Kaplan Nuance Sunnyvale NL/AI Lab Department of Linguistics, Stanford May, 2013

2 GUI: The problem Extensional 2

3 CUI: The solution Intensional Bobrow et al Nuance Communications, Inc. All rights reserved. ENTERPRISE SOLUTIONS

4 From then to now: Obstacles Typing is unnatural, speech recognition is hard Language is efficient: much is unsaid but understood Rampant ambiguity without context and expectations The chicken seemed ready to eat Precision is tedious: Conversation with a 3-year-old? Language is complex Many overlapping patterns to encode meaning Conversation is a cooperative social activity Speaker/hearer model each other, share conventions, plan and reason You need something worth talking about Detect goals, track environment, determine/execute useful actions 4

5 The opportunity Ubiquitous computing ubiquitous complexity Mass distribution of cost-effective computation confusion (try controlling a TV, thermostat, irrigation clock ) Phone as portal: the illusion of simplicity Universal: Applification of other connected devices Uniform: Same channel for special interactions Personal and situational: preferred and appropriate behavior Cloud infrastructure for shared information and back-end processing Advances on key components: speech, NL, dialog, reasoning Public/defined interfaces to local devices, remote sources and services (Siri: The NL Summer) 5

6 Speech recognition performance Out-of-the-box performance is becoming good and continues to improve rapidly % users with a given error rate % Users experiencing an error rate of < 10% during first-time mobile use Average word error rate 20% 18% 16% 14% 18% Average word error rate reduction per year 10 12% Average word error rate % 10%

7 Recognition research WHAT S CHANGED? 5 years ago Now Training data 1,000 s of hours 100,000 s of hours Algorithms Maximum-likelihood Deep Belief Neural Networks 100 X more computation Computation 1 workstation 10,000 s of cores Run-time GMM likelihoods + Matrix multiplies Nuance Communications, Inc. All rights reserved. ENTERPRISE SOLUTIONS

8 Conversation and Information Ordinary language to describe what you need When will my package arrive? Clarification/repair No, tomorrow Drill-down discussion What are the 15-year rates? Immediate sentiment You lost my luggage! 8

9 Conversation and Action E-commerce Flight to San Diego Mexican restaurants? No, Italian OK, table for 4 at about 7 TV Direct command: Change to channel 5 Standing order: Turn the volume down during ads Thermostat A little cooler in the afternoon Vacation starting Tuesday Customer service Change my address to xxxx. 9

10 A simple conversation A dialog between Bob and a speech-enabled proactive Conversational Assistant (CA) Bob> Book a table at Zingari s after my last meeting and let Tom and Brian know to meet me there. CA> Sorry, but there aren t any tables open until 9pm. Would you like me to find you another Italian restaurant in the area at about 6:30pm? Bob> Can you find a table at a restaurant with a good wine list? CA> Barbacco has an opening. It s in the Financial District but the travel time is about the same. Bob> Ok. That sounds good. 10

11 A simple conversation A dialog between Bob and a speech-enabled proactive Conversational Assistant (CA) Bob> Book a table at Zingari s after my last meeting and let Tom and Brian know to meet me there. CA> Sorry, but there aren t any tables open until 9pm. Would you like me to find you another Italian restaurant in the area at about 6:30pm? Bob> Can you find a table at a restaurant with a good wine list? CA> Barbacco has an opening. It s before in leaving the Financial work District but the travel time is about the same. Bob> Ok. That sounds good. Ambiguous: booking done now or after last meeting Assumption: last meeting today (check calendar) and dinner tonight (tomorrow also meets constraints) Expectation: Bob usually spends 30 minutes on Factor in travel time: 6:30 for reservation Referent for Tom and Brian 11

12 A simple conversation A dialog between Bob and a speech-enabled proactive Conversational Assistant (CA) Bob> Book a table at Zingari s after my last meeting and let Tom and Brian know to meet me there. CA> Sorry, but there aren t any tables open until 9pm. Would you like me to find you another Italian restaurant in the area at about 6:30pm? Bob> Can you find a table at a restaurant with a good wine list? CA> Barbacco has an opening. Informative It s in the explanation, Financial not District just I can t but the travel time is about the same. Bob> Ok. That sounds good. Initial search fails Relax less important constraints, propose an otherwise similar alternative: type of restaurant and table time Expose most salient of remaining constraints 12

13 A simple conversation A dialog between Bob and a speech-enabled proactive Conversational Assistant (MA) Bob> Book a table at Zingari s after my last meeting and let Tom and Semantic search: an Italian restaurant with good wine Brian know to meet me there. CA> Sorry, but there aren t any tables open until 9pm. Would you like me to find you another Italian restaurant in the area at about 6:30pm? Bob> Can you find a table at a restaurant with a good wine list? CA> Barbacco has an opening. It s in the Financial District but the travel time is about the same. Bob> Ok. That sounds good. Indirect speech act: Reserve, not Yes or No Implicit confirmation: No disagreement with exposed constraints Interpretation: A table at an Italian restaurant with a good wine list Sources: Yelp, restaurant websites, maps 13

14 A simple conversation A dialog between Bob and a speech-enabled proactive Conversational Assistant (CA) Bob> Book a table at Zingari s after my last meeting and let Tom and Brian know to meet me there. CA> Sorry, but there aren t any tables in preference open to until others 9pm. Would you like me to find you another Italian restaurant ( same in travel the area time, at Italian, about Tonight ) 6:30pm? Bob> Can you find a table at a restaurant with a good wine list? CA> Barbacco has an opening. It s in the Financial District but the travel time is about the same. Bob> Ok. That sounds good. Drop one of the constraints ( restaurant in the area ) 14

15 A simple conversation A dialog between Bob and a speech-enabled proactive Conversational Assistant (CA) Bob> Book a table at Zingari s after my last meeting and let Tom and Brian know to meet me there. CA> Sorry, but there aren t any tables open until 9pm. Would you like reservations, sends s to Tom and Brian. me to find you another Italian restaurant in the area at about 6:30pm? Bob> Can you find a table at a restaurant with a good wine list? CA> Barbacco has an opening. It s in the Financial District but the travel time is about the same. Bob> Ok. That sounds good. End of Dialog. CA goes to Opentable, makes the Persistence: The duties of a true assistant are not yet complete. It must monitor the plan for unexpected events such as delays. 15

16 Many components, many disciplines Statistical Training & Symbolic Constraints: Data, grammars Input Language Reasoning Speech Recognition Text, Gesture, Biometrics Context Language Comprehension Sentiment Analysis Dialog Manager Speech Acts Task Planner Web Output Speech Synthesis Text, Graphics Language Generation Visual design Collaboration Model User Model Theorem Prover Apps Devices Knowledge Representation, Ontologies, Facts 16

17 Language and reasoning Morphology Syntax Semantics Pragmatics Discourse & Dialog AI and Reasoning Major technical challenges: Integration of independent best-of-breed components Managing end-to-end ambiguity through hard constraints and probabilistic reasoning Bridging language and logic Inferring intent & learning preferences Global resolution of ambiguity while preserving modularity Deployment at scale Modeling collaboration Representing knowledge 17

18 Computational challenge: Pervasive ambiguity Morphology & Syntax Semantics Mentions Every nominee got an award. The same award or each their own? The chicken is ready to eat. Cooked or hungry? walks untieable knot bank General Mills noun or verb? (untie)able or un(tieable)? river or financial? person or company 18

19 Ambiguity can be explosive if alternatives multiply within or across modules Knowledge Semantics Syntax Mentions Speech 19

20 Pruning Premature Disambiguation Typical approach: Local heuristics to kill as soon as possible Oops: Strong constraints may reject the so-far-best (= only) option Statistics Speech X Mentions X Syntax X X Semantics X Knowledge Semantics may know: The veal is ready to eat. The calf is ready to eat. 20

21 Syntactic ambiguity Bob Book a table after my last meeting (LFG/XLE-Web, Bergen) Book Later Book Now, Table Later Statistics and pragmatic reasoning to choose interpretation 21

22 Packing syntactic ambiguity book now, table later shared Book a table after my last meeting book later Interpretation chosen by later modules (pragmatic reasoning and domain statistics) Choice doesn t depend on meeting structure, so never unpacked 22

23 Technical approaches: data + rules Data driven learning by observation Classification and correlation, on the head (current fad) Automatically (?) populates framework of domain concepts and contexts Probabilistic preference and disambiguation Symbolic learning by instruction Interpretation, on the tail Deep, long-span linguistic structures provide statistical locality Less domain dependent Back-offs for robustness Appropriate combination: Trade data for knowledge 23

24 Semantic analysis Bob> Can you find a table at a restaurant with a good wine list? Syntactic structure mapped to logical representation with event tokens, individual objects, properties and relations Davidsonian representation (event variables) supports incremental addition of new constraints by conjunction Discourse Representation Structures (DRS) for ease of manipulation, with translation to first order logic for more general reasoning e1,e2,x,y Surface_request(e1,e2) Agent(e1,Bob), Agent(e2,CA) Find(e2), Restaurant(x), Object(e2,x) Food(x,Italian), Open(x) Available(y,x), Wine(y), Good(y) Discourse structure Logical representation 24

25 Pragmatics Example: Speech acts Bob> Can you find a table at a restaurant with a good wine list? Transform surface speech act (ability to find a table?) into a request to make a reservation e1,e2,x,y Surface_request(e1,e2) Agent(e1,Bob), Agent(e2,CA) Find(e2), Restaurant(x), Object(e2,x) Food(x,Italian), Open(x) Available(y,x), Wine(y), Good(y) e1,e2,x,y Request(e1,e2) Agent(e1,Bob), Agent(e2,CA) Reserve(e2), Restaurant(x), Object(e2,x) Food(x,Italian), Open(x) Available(y,x), Wine(y), Good(y) 25

26 Conversational interaction: Plan and replan Book a table at Zingari s after my last meeting Task recipe library Book table Get restaurant Get restaurant Get Guide Find Reserve Get restaurant Get time Reserve From user Get Guide Find Yelp Get candidates Compare Opentable Book_table(e1) Agent(e1,CA) Object(e1,r), Restaurant(r) Date(d),Time(t) Get_rest(e2) Agent(e2,CA) From_user(e3) r=zingari 26 Get_time(e4) d=12112 t=6:30pm Dynamic Intention Structures Opentable: not available Reserve(e5) Agent(e5,CA) Object(e5,r) Source(e5, Opentable) Available(r,d,t) Select new recipe and elaborate Book_table(e1) Agent(e1,CA),Object(e1,r), Restaurant(r), Has(r,w), wine(w),good(w), Date(d),Time(t) Get_restaurant(e2), Agent(e2,CA) Get_guide(e3) Agent(e3,CA) Object(e3,y) use(e3 ) Agent(e3,CA) Target(e3,y) y=yelp Find(e4), Agent(e4,CA) Object(e4,r) Source(e4,y) Type(italian), Driving(20m) r=barbacco. Get_time(e5) d=12112 t=6:30pm Reserve(e6) Agent(e6,CA) Object(e6,r) Source(e6, Opentable) Available(r,d,t)

27 Proactive monitoring, replan on failure Anticipate glitches, create standing orders If CA comes to believe that Bob hasn t left the office by 5:30 pm, it will form the intention to replan the book-table action CA> Bob, you re running late. Should I change the reservation? Bob> Yes, I ll be ready to leave in about 30 minutes

28 Standing orders Specific constraints on future/hypothetical events: Intensionality Let me know when I get close to a café but not Starbucks Move $1000 to my savings when my paycheck comes in Linguistic pipeline decodes idiosyncratic intent long tail Planner creates future-situation recognizer Monitor watches and initiates action (location, time, bank ) Also: Collaborative help for big-head situations (e.g. Google Now cards) Infer from common interests and repeated patterns of daily life Little/no linguistic analysis Templatic but flexible use of general planning and monitoring User model and context awareness to suppress unwanted intrusions 28

29 Extending across domains Linguistic analysis, conventions of conversation, planning principles remain General vocabulary and grammatical expressions of meaning are (mostly) domain independent I want Can you Later than that No, French Maybe Monday Structured representations can be interpreted according to context Upper ontology and axioms provide stable background People, places, objects, action, time, cause-effect, desire, belief, intention New domain: augment general framework Add/specialize vocabulary and ontology Define constraints and inferences Provide access to domain information sources and execution interfaces Architecture, algorithms, background are language independent 29

30 Conversation: Natural, efficient, effective Universal way of interacting with Ubiquitous technology: Phone, TV, thermostat Information, Institutions, and services (Many) core technologies now exist Challenge of integration, ambiguity Perfection is not required: People misunderstand too Must set appropriate expectations Must provide for easy repair Confirmation is often unnatural A defensive hangover from the errorful past Needed for actions with consequence 30

31 Conversation: The killer app for NL and AI 31

32 32

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