Make NLU case-insensitive

src/is.ts

@@ -2,11 +2,11 @@ import InformationState from "./types";
 import { objectsEqual} from "./utils";
 
 export const initialIS = (): InformationState => {
-  const predicates = {
+  const predicates = { // Mapping from predicate to sort
     favorite_food: "food",
     booking_course: "course",
   };
-  const individuals = {
+  const individuals = { // Mapping from individual to sort
     pizza: "food",
     LT2319: "course",
   };

src/nlug.ts

@@ -7,19 +7,23 @@ interface NLUMapping {
 type NLGMapping = [Move, string][];
 
 const nluMapping: NLUMapping = {
-  "Where is the lecture?": {
+  "where is the lecture?": {
     type: "ask",
     content: (x) => ({"predicate": "booking_room", "argument": x}),
   },
-  "What's your favorite food?": {
+  "what's your favorite food?": {
     type: "ask",
     content: (x) => ({"predicate": "favorite_food", "argument": x}),
   },
-  "Pizza": {
+  "pizza": {
     type: "answer",
     content: "pizza",
   },
-  "Dialogue Systems 2": {
+  "dialogue systems 2": {
+    type: "answer",
+    content: "LT2319",
+  },
+  "dialogue systems": {
     type: "answer",
     content: "LT2319",
   },
@@ -63,7 +67,7 @@ export function nlg(move: Move | null): string {
  */
 export function nlu(utterance: string): Move {
   return (
-    nluMapping[utterance] || {
+    nluMapping[utterance.toLowerCase()] || {
       type: "unknown",
       content: "",
     }

src/rules.ts

@@ -137,7 +137,6 @@ export const rules: Rules = {
     const a = is.shared.lu!.move.content;
     if (topQUD && is.shared.lu!.move.type === "answer") {
       if (is.domain.relevant(a, topQUD)) {
-        // TODO (?) should combined proposition be added to domain?
         const newIS = {
           ...is,
           shared: {