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Hi I have been the following WWDC21 "dynamic training on iOS" - I have been able to get the training working, with an output of the iterations etc being printed out in the console as training progresses. However I am unable to retrieve the checkpoints or result/model once training has completed (or is in progress) nothing in the callback fires. If I try to create a model from the sessionDirectory - it returns nil (even though training has clearly completed). Please can someone help or provide pointers on how to access the results/checkpoints so that I can make a MlModel and use it. var subscriptions = [AnyCancellable]()         let job = try! MLStyleTransfer.train(trainingData: datasource, parameters: trainingParameters, sessionParameters: sessionParameters) job.result.sink { result in             print("result ", result)         }         receiveValue: { model in try? model.write(to: sessionDirectory)             let compiledURL = try? MLModel.compileModel(at: sessionDirectory)             let mlModel = try? MLModel(contentsOf: compiledURL!)         }         .store(in: &subscriptions) This also does not work: job.checkpoints.sink { checkpoint in // Process checkpoint  let model = MLStyleTransfer(trainingData: checkpoint) } .store(in: &subscriptions)         } This is the printout in the console: Using CPU to create model +--------------+--------------+--------------+--------------+--------------+ | Iteration    | Total Loss   | Style Loss   | Content Loss | Elapsed Time | +--------------+--------------+--------------+--------------+--------------+ | 1            | 64.9218      | 54.9499      | 9.97187      | 3.92s        | 2022-02-20 15:14:37.056251+0000 DynamicStyle[81737:9175431] [ServicesDaemonManager] interruptionHandler is called. -[FontServicesDaemonManager connection]_block_invoke | 2            | 61.7283      | 24.6832      | 8.30343      | 9.87s        | | 3            | 59.5098      | 27.7834      | 11.7603      | 16.19s       | | 4            | 56.2737      | 16.163       | 10.985       | 22.35s       | | 5            | 53.0747      | 12.2062      | 12.0783      | 28.08s       | +--------------+--------------+--------------+--------------+--------------+ Any help would be appreciated on how to retrieve models. Thanks