针对mnn模型处理，输出增加shape

src/deploy/facealign/pfld.ts

@@ -51,7 +51,7 @@ export class PFLD extends Model {
 				shape: [1, 3, input.shape[2], input.shape[3]],
 			}
 		});
-		const pointsBuffer = res[pointsOutput.name];
+		const pointsBuffer = res[pointsOutput.name].data;
 
 		const points: FacePoint[] = [];
 		for (let i = 0; i < pointsBuffer.length; i += 2) {