Crowd Count Prediction.playground spurious linker errors: https://github.com/dimroc/count/tree/master/ios

Prediction.playground.linkerError.txt

error: Couldn't lookup symbols:
  type metadata for CrowdCountApiMac.FriendlyClassification
  CrowdCountApiMac.MultiArray.copy() -> CrowdCountApiMac.MultiArray<A>
  CrowdCountApiMac.MultiArray.image(offset: A, scale: A) -> Swift.Optional<__C.NSImage>
  CrowdCountApiMac.FriendlyPredictor.predictAllPromise(image: __C.NSImage, on: __C.OS_dispatch_queue) -> Promises.Promise<Swift.Array<CrowdCountApiMac.FriendlyPrediction>>
  protocol witness table for Swift.Double : CrowdCountApiMac.MultiArrayType in CrowdCountApiMac
  __swift_FORCE_LOAD_$_swiftCoreMedia
  __swift_FORCE_LOAD_$_swiftCoreAudio
  CrowdCountApiMac.FriendlyPredictor.DensityMapWidth.unsafeMutableAddressor : Swift.Int
  type metadata accessor for CrowdCountApiMac.FriendlyPredictor
  __swift_FORCE_LOAD_$_swiftAccelerate
  CrowdCountApiMac.MultiArray.normalize() -> CrowdCountApiMac.MultiArray<A>
  CrowdCountApiMac.FriendlyPredictor.classifyPromise(image: __C.NSImage, on: __C.OS_dispatch_queue) -> Promises.Promise<CrowdCountApiMac.FriendlyClassification>
  (extension in CrowdCountApiMac):__C.NSImage.flipVertically() -> __C.NSImage
  type metadata for CrowdCountApiMac.FriendlyPrediction
  __swift_FORCE_LOAD_$_swiftVision
  CrowdCountApiMac.FriendlyPredictor.__allocating_init() -> CrowdCountApiMac.FriendlyPredictor
  static CrowdCountApiMac.Duration.measure(_: Swift.String, depth: Swift.Int, block: () -> ()) -> Swift.Double
  type metadata accessor for CrowdCountApiMac.Duration
  CrowdCountApiMac.FriendlyPredictor.DensityMapHeight.unsafeMutableAddressor : Swift.Int