LGF utterance configuration

Utterance templates

This document describes how to configure utterance templates for intents.

• LGF configuration approach

  (1) Collect utterances: Simulate user utterances in real-world scenarios or extract them from a raw corpus.

  (2) Select key words: Use keywords that confirm a hit for the target intent.

  (3) Expand key words: Add synonyms to enrich the corpus and increase coverage.

  (4) Reorder key words: Rearrange key words into different combinations that still match the intent.

• Basic elements

  An utterance template, or LGF, uses template matching to represent user utterances. Utterance templates support the following elements.

  Element	Description	Example
  ${}	References an entity parameter.	Template content: ${City} Template meaning: References the "City" entity parameter. Note The system has built-in common entities and also supports custom entities. For more information about entities, see Entity Management.
  []	Optional character	Template content: [Please|Kindly] get me some water Matching utterances: "Get me some water", "Please get me some water", and "Kindly get me some water" all match the utterance template.
  ()	Required character	Template content: Nearby (restaurant|eatery) Matching utterances: "Nearby restaurant" and "Nearby eatery" match the utterance template. However, "Nearby hotel" or "Nearby" do not match.
  |	Or	Template content: Xiaoming's (phone|contact information) Matching utterances: "Xiaoming's phone" and "Xiaoming's contact information" both match the utterance template.
  .{min,max}	A specified number of characters	Template content: .{0,3}${Date}${City} weather Template meaning: .{0,3} represents any 0 to 3 characters. Matching utterances (including but not limited to): "Check tomorrow's weather in Beijing", "I want to ask about the day after tomorrow's weather in Hangzhou", and "Next Monday's weather in Shanghai" all match the utterance template.

  Important

  1. All symbols used in the elements must be standard English characters.

  2. When you use a logical NOT before a wildcard rule, use `!` instead of `.`. The LGF configuration will fail if you use a `.` before the wildcard. For example, in the expression `(!decoration|rent){0,10}(need|want|recommend|introduce)`, the NOT logic part `(!...){0,10}` does not have a period before the curly braces.

  3. An entire LGF utterance cannot consist only of optional parts, such as `.{min,max}` and `[]`.

  4. LGFs for different intents must not overlap. This can cause incorrect intent hits and prevent a match with the correct intent.

• Common usage

  1. Use common wildcard characters to extract keywords and improve semantic generalization.

     Is a credit card required?

     (!decoration|rent){0,10}(need|want|recommend|introduce)(!decoration|rent){0,10}(house|property|floor plan|furnished)(!decoration|rent){0,10}

  2. Use common NOT logic.

     This sentence pattern asks whether it is necessary to buy a house.

     (!decoration|rent){0,10}(need|want|recommend|introduce)(!decoration|rent){0,10}(house|property|floor plan|furnished)(!decoration|rent){0,10}

  3. Common LGF patterns for intents

     Intent name	LGF configuration
     Convenient	(!|not|no){0,8}(yes|okay|sure|fine|convenient|go ahead|speak|ask|have time|free).{0,10}
     Inconvenient	.{0,18}(injection|vaccine|hurry|not.{0,2}convenient|cooking|kid|inconvenient|meeting|busy|driving|takeoff|catching a flight|catching a train|catching a high-speed train|subway|highway|sleeping|no time|emergency|hospital|sick|car accident|check-up|prenatal check-up|eating|drinking|attending a wedding|rehearsal|dress rehearsal|class|traveling|live stream|showering|at work|discussion|work|training|handing out flyers|working|night shift|day shift|taking medicine|doing laundry|cleaning|sanitation|going upstairs|parking|ticket check|flight|train|high-speed train|wedding banquet|going to market|attending a fair|temple fair|playing|picking up kids|dropping off kids|attending a lecture|giving a lecture|symposium|Summit|translation|communication|seminar|postgraduate exam|research|trade show|exhibition|visiting|library|hiking|swimming|bathhouse scrub|game|museum|exploration|surveying).{0,18} .{0,20}(don't have|no|not|not have).{0,6}(time|leisure).{0,10}
     Satisfied	(!|not|no|non|un){0,10}(satisfied|good|great|awesome|nice|ok|fine|perfect).{0,10}
     Unsatisfied	.{0,10}(unsatisfied|not good|poor|terrible|bad|awful).{0,10}
     Affirmative	(!not|no){0,8}(yes|right|correct|indeed|that's it)(!robot|what|who|which|?){0,8}
     Negative	.{0,15}(no|not|fail|error|wrong|false).{0,10}
     Don't know the person	.{0,10}(don't know|wrong number|not sure|never heard of).{0,8}