feat: Provide RNN a means of formatting

For use with https://github.com/BrainJS/train-stream/

Author: robertleeplummerjr

package.json

@@ -113,5 +113,5 @@
   },
   "types": "dist/src",
   "unpkg": "dist/browser.js",
-  "version": "2.0.0-beta.17"
+  "version": "2.0.0-beta.18"
 }

src/recurrent/rnn-time-step.ts

@@ -809,6 +809,8 @@ export class RNNTimeStep extends RNN {
     return result;
   }
 
+  // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+  // @ts-expect-error
   formatData(data: FormattableData[]): Float32Array[][] {
     const dataShape = lookup.dataShape(data).join(',');
     switch (dataShape) {

src/recurrent/rnn.ts

@@ -645,8 +645,14 @@ export class RNN {
     };
   }
 
-  addFormat(): void {
-    throw new Error('not yet implemented');
+  addFormat(data: Value): void {}
+
+  formatData(data: Value[]): number[][] {
+    const result = [];
+    for (let i = 0; i < data.length; i++) {
+      result.push(this.options.dataFormatter.formatDataIn(data[i]));
+    }
+    return result;
   }
 
   toJSON(): IRNNJSON {