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"https://github.com/pcuenca/ml-stable-diffusion"; + requirement = { + branch = main; + kind = branch; + }; + }; +/* End XCRemoteSwiftPackageReference section */ + +/* Begin XCSwiftPackageProductDependency section */ + EBB5BA5729425E17003A2A5B /* Path */ = { + isa = XCSwiftPackageProductDependency; + package = EBB5BA5629425E17003A2A5B /* XCRemoteSwiftPackageReference "Path.swift" */; + productName = Path; + }; + EBB5BA5C294504DE003A2A5B /* ZIPFoundation */ = { + isa = XCSwiftPackageProductDependency; + package = EBB5BA5B294504DE003A2A5B /* XCRemoteSwiftPackageReference "ZIPFoundation" */; + productName = ZIPFoundation; + }; + EBB5BA5F2946365A003A2A5B /* StableDiffusion */ = { + isa = XCSwiftPackageProductDependency; + package = EBB5BA5E2946365A003A2A5B /* XCRemoteSwiftPackageReference "ml-stable-diffusion" */; + productName = StableDiffusion; + }; +/* End XCSwiftPackageProductDependency section */ + }; + rootObject = EBE755BD293E37DD00806B32 /* Project object */; +} diff --git a/Diffusion.xcodeproj/project.xcworkspace/contents.xcworkspacedata b/Diffusion.xcodeproj/project.xcworkspace/contents.xcworkspacedata new file mode 100644 index 0000000..919434a --- /dev/null +++ b/Diffusion.xcodeproj/project.xcworkspace/contents.xcworkspacedata @@ -0,0 +1,7 @@ + + + + + diff --git a/Diffusion.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist b/Diffusion.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist new file mode 100644 index 0000000..18d9810 --- /dev/null +++ b/Diffusion.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist @@ -0,0 +1,8 @@ + + + + + IDEDidComputeMac32BitWarning + + + diff --git a/Diffusion/Assets.xcassets/AccentColor.colorset/Contents.json b/Diffusion/Assets.xcassets/AccentColor.colorset/Contents.json new file mode 100644 index 0000000..eb87897 --- /dev/null +++ b/Diffusion/Assets.xcassets/AccentColor.colorset/Contents.json @@ -0,0 +1,11 @@ +{ + "colors" : [ + { + "idiom" : "universal" + } + ], + "info" : { + "author" : "xcode", + "version" : 1 + } +} diff --git a/Diffusion/Assets.xcassets/AppIcon.appiconset/.DS_Store b/Diffusion/Assets.xcassets/AppIcon.appiconset/.DS_Store new file mode 100644 index 0000000..5008ddf Binary files /dev/null and b/Diffusion/Assets.xcassets/AppIcon.appiconset/.DS_Store differ diff --git a/Diffusion/Assets.xcassets/AppIcon.appiconset/Contents.json b/Diffusion/Assets.xcassets/AppIcon.appiconset/Contents.json new file mode 100644 index 0000000..be97d4c --- /dev/null +++ b/Diffusion/Assets.xcassets/AppIcon.appiconset/Contents.json @@ -0,0 +1,65 @@ +{ + "images" : [ + { + "filename" : "labrador-x2.png", + "idiom" : "universal", + "platform" : "ios", + "size" : "1024x1024" + }, + { + "idiom" : "mac", + "scale" : "1x", + "size" : "16x16" + }, + { + "idiom" : "mac", + "scale" : "2x", + "size" : "16x16" + }, + { + "idiom" : "mac", + "scale" : "1x", + "size" : "32x32" + }, + { + "idiom" : "mac", + "scale" : "2x", + "size" : "32x32" + }, + { + "idiom" : "mac", + "scale" : "1x", + "size" : "128x128" + }, + { + "idiom" : "mac", + "scale" : "2x", + "size" : "128x128" + }, + { + "idiom" : "mac", + "scale" : "1x", + "size" : "256x256" + }, + { + "idiom" : "mac", + "scale" : "2x", + "size" : "256x256" + }, + { + "idiom" : "mac", + "scale" : "1x", + "size" : "512x512" + }, + { + "filename" : "labrador-x2 1.png", + "idiom" : "mac", + "scale" : "2x", + "size" : "512x512" + } + ], + "info" : { + "author" : "xcode", + "version" : 1 + } +} diff --git a/Diffusion/Assets.xcassets/AppIcon.appiconset/labrador-x2 1.png b/Diffusion/Assets.xcassets/AppIcon.appiconset/labrador-x2 1.png new file mode 100644 index 0000000..1034ce2 Binary files /dev/null and b/Diffusion/Assets.xcassets/AppIcon.appiconset/labrador-x2 1.png differ diff --git a/Diffusion/Assets.xcassets/AppIcon.appiconset/labrador-x2.png b/Diffusion/Assets.xcassets/AppIcon.appiconset/labrador-x2.png new file mode 100644 index 0000000..1034ce2 Binary files /dev/null and b/Diffusion/Assets.xcassets/AppIcon.appiconset/labrador-x2.png differ diff --git a/Diffusion/Assets.xcassets/Contents.json b/Diffusion/Assets.xcassets/Contents.json new file mode 100644 index 0000000..73c0059 --- /dev/null +++ b/Diffusion/Assets.xcassets/Contents.json @@ -0,0 +1,6 @@ +{ + "info" : { + "author" : "xcode", + "version" : 1 + } +} diff --git a/Diffusion/Assets.xcassets/placeholder.imageset/Contents.json b/Diffusion/Assets.xcassets/placeholder.imageset/Contents.json new file mode 100644 index 0000000..3c16750 --- /dev/null +++ b/Diffusion/Assets.xcassets/placeholder.imageset/Contents.json @@ -0,0 +1,21 @@ +{ + "images" : [ + { + "idiom" : "universal", + "scale" : "1x" + }, + { + "filename" : "labrador.png", + "idiom" : "universal", + "scale" : "2x" + }, + { + "idiom" : "universal", + "scale" : "3x" + } + ], + "info" : { + "author" : "xcode", + "version" : 1 + } +} diff --git a/Diffusion/Assets.xcassets/placeholder.imageset/labrador.png b/Diffusion/Assets.xcassets/placeholder.imageset/labrador.png new file mode 100644 index 0000000..0cdaef7 Binary files /dev/null and b/Diffusion/Assets.xcassets/placeholder.imageset/labrador.png differ diff --git a/Diffusion/Diffusion.entitlements b/Diffusion/Diffusion.entitlements new file mode 100644 index 0000000..625af03 --- /dev/null +++ b/Diffusion/Diffusion.entitlements @@ -0,0 +1,12 @@ + + + + + com.apple.security.app-sandbox + + com.apple.security.files.user-selected.read-only + + com.apple.security.network.client + + + diff --git a/Diffusion/DiffusionApp.swift b/Diffusion/DiffusionApp.swift new file mode 100644 index 0000000..265eb1f --- /dev/null +++ b/Diffusion/DiffusionApp.swift @@ -0,0 +1,20 @@ +// +// DiffusionApp.swift +// Diffusion +// +// Created by Pedro Cuenca on December 2022. +// See LICENSE at https://github.com/huggingface/swift-coreml-diffusers/LICENSE +// + +import SwiftUI + +@main +struct DiffusionApp: App { + var body: some Scene { + WindowGroup { + LoadingView() + } + } +} + +extension String: Error {} diff --git a/Diffusion/Downloader.swift b/Diffusion/Downloader.swift new file mode 100644 index 0000000..24a85a5 --- /dev/null +++ b/Diffusion/Downloader.swift @@ -0,0 +1,91 @@ +// +// Downloader.swift +// Diffusion +// +// Created by Pedro Cuenca on December 2022. +// See LICENSE at https://github.com/huggingface/swift-coreml-diffusers/LICENSE +// + +import Foundation +import Combine +import Path + +class Downloader: NSObject, ObservableObject { + private(set) var destination: URL + + enum DownloadState { + case notStarted + case downloading(Double) + case completed(URL) + case failed(Error) + } + + private(set) lazy var downloadState: CurrentValueSubject = CurrentValueSubject(.notStarted) + private var stateSubscriber: Cancellable? + + init(from url: URL, to destination: URL) { + self.destination = destination + super.init() + + // .background allows downloads to proceed in the background + let config = URLSessionConfiguration.background(withIdentifier: "net.pcuenca.diffusion.download") + let urlSession = URLSession(configuration: config, delegate: self, delegateQueue: OperationQueue()) + downloadState.value = .downloading(0) + urlSession.getAllTasks { tasks in + // If there's an existing pending background task, let it proceed, otherwise start a new one. + // TODO: check URL when we support downloading more models. + if tasks.first == nil { + urlSession.downloadTask(with: url).resume() + } + } + } + + @discardableResult + func waitUntilDone() throws -> URL { + // It's either this, or stream the bytes ourselves (add to a buffer, save to disk, etc; boring and finicky) + let semaphore = DispatchSemaphore(value: 0) + stateSubscriber = downloadState.sink { state in + switch state { + case .completed: semaphore.signal() + case .failed: semaphore.signal() + default: break + } + } + semaphore.wait() + + switch downloadState.value { + case .completed(let url): return url + case .failed(let error): throw error + default: throw("Should never happen, lol") + } + } +} + +extension Downloader: URLSessionDelegate, URLSessionDownloadDelegate { + func urlSession(_: URLSession, downloadTask: URLSessionDownloadTask, didWriteData _: Int64, totalBytesWritten _: Int64, totalBytesExpectedToWrite _: Int64) { + downloadState.value = .downloading(downloadTask.progress.fractionCompleted) + } + + func urlSession(_: URLSession, downloadTask _: URLSessionDownloadTask, didFinishDownloadingTo location: URL) { + guard let path = Path(url: location) else { + downloadState.value = .failed("Invalid download location received: \(location)") + return + } + guard let toPath = Path(url: destination) else { + downloadState.value = .failed("Invalid destination: \(destination)") + return + } + do { + try path.move(to: toPath, overwrite: true) + downloadState.value = .completed(destination) + } catch { + downloadState.value = .failed(error) + } + } + + func urlSession(_: URLSession, task: URLSessionTask, didCompleteWithError error: Error?) { + if let error = error { + downloadState.value = .failed(error) + } + } +} diff --git a/Diffusion/Pipeline/Pipeline.swift b/Diffusion/Pipeline/Pipeline.swift new file mode 100644 index 0000000..7d1a7c7 --- /dev/null +++ b/Diffusion/Pipeline/Pipeline.swift @@ -0,0 +1,56 @@ +// +// Pipeline.swift +// Diffusion +// +// Created by Pedro Cuenca on December 2022. +// See LICENSE at https://github.com/huggingface/swift-coreml-diffusers/LICENSE +// + +import Foundation +import CoreML +import Combine + +import StableDiffusion + +typealias StableDiffusionProgress = StableDiffusionPipeline.Progress + +class Pipeline { + let pipeline: StableDiffusionPipeline + + var progress: StableDiffusionProgress? = nil { + didSet { + progressPublisher.value = progress + } + } + lazy private(set) var progressPublisher: CurrentValueSubject = CurrentValueSubject(progress) + + + init(_ pipeline: StableDiffusionPipeline) { + self.pipeline = pipeline + } + + func generate(prompt: String, scheduler: StableDiffusionScheduler, numInferenceSteps stepCount: Int = 50, seed: UInt32? = nil) throws -> CGImage { + let beginDate = Date() + print("Generating...") + let theSeed = seed ?? UInt32.random(in: 0.. = CurrentValueSubject(state) + + func setInitialState() { + if ready { + state = .readyOnDisk + return + } + if downloaded { + state = .downloaded + return + } + state = .waitingToDownload + } +} + +extension PipelineLoader { + static func removeAll() { + try? models.delete() + } +} + +extension PipelineLoader { + var filename: String { + return url.lastPathComponent + } + + var downloadedPath: Path { PipelineLoader.models / filename } + var downloadedURL: URL { downloadedPath.url } + + var uncompressPath: Path { downloadedPath.parent } + + var packagesFilename: String { downloadedPath.basename(dropExtension: true) } + var compiledPath: Path { downloadedPath.parent/packagesFilename } + + var downloaded: Bool { + return downloadedPath.exists + } + + var ready: Bool { + return compiledPath.exists + } + + // TODO: maybe receive Progress to add another progress as child + func prepare() async throws -> Pipeline { + do { + try PipelineLoader.models.mkdir(.p) + try await download() + try await unzip() + let pipeline = try await load(url: compiledPath.url) + return Pipeline(pipeline) + } catch { + state = .failed(error) + throw error + } + } + + @discardableResult + func download() async throws -> URL { + if ready || downloaded { return downloadedURL } + + let downloader = Downloader(from: url, to: downloadedURL) + downloadSubscriber = downloader.downloadState.sink { state in + if case .downloading(let progress) = state { + print(progress) + self.state = .downloading(progress) + } + } + try downloader.waitUntilDone() + return downloadedURL + } + + func unzip() async throws { + guard downloaded else { return } + state = .uncompressing + do { + try FileManager().unzipItem(at: downloadedURL, to: uncompressPath.url) + } catch { + // Cleanup if error occurs while unzipping + try uncompressPath.delete() + throw error + } + try downloadedPath.delete() + state = .readyOnDisk + } + + func load(url: URL) async throws -> StableDiffusionPipeline { + let beginDate = Date() + let configuration = MLModelConfiguration() + configuration.computeUnits = .cpuAndGPU // .all works for v1.4, but not for v1.5. TODO: measure performance on different devices + let pipeline = try StableDiffusionPipeline(resourcesAt: url, + configuration: configuration, + disableSafety: false) + print("Pipeline loaded in \(Date().timeIntervalSince(beginDate))") + state = .loaded + return pipeline + } +} diff --git a/Diffusion/Preview Content/Preview Assets.xcassets/Contents.json b/Diffusion/Preview Content/Preview Assets.xcassets/Contents.json new file mode 100644 index 0000000..73c0059 --- /dev/null +++ b/Diffusion/Preview Content/Preview Assets.xcassets/Contents.json @@ -0,0 +1,6 @@ +{ + "info" : { + "author" : "xcode", + "version" : 1 + } +} diff --git a/Diffusion/Views/Loading.swift b/Diffusion/Views/Loading.swift new file mode 100644 index 0000000..e7834c7 --- /dev/null +++ b/Diffusion/Views/Loading.swift @@ -0,0 +1,97 @@ +// +// Loading.swift +// Diffusion +// +// Created by Pedro Cuenca on December 2022. +// See LICENSE at https://github.com/huggingface/swift-coreml-diffusers/LICENSE +// + +import SwiftUI +import Combine + +let PIPELINE_URL = "https://huggingface.co/pcuenq/coreml-stable-diffusion/resolve/main/coreml-stable-diffusion-v1-5_original_compiled.zip" + +class DiffusionGlobals: ObservableObject { + @Published var pipeline: Pipeline? = nil +} + +struct LoadingView: View { + @StateObject var context = DiffusionGlobals() + + @State private var preparationPhase = "Downloading…" + @State private var downloadProgress: Double = 0 + + enum CurrentView { + case loading + case textToImage + case error(String) + } + @State private var currentView: CurrentView = .loading + + @State private var stateSubscriber: Cancellable? + + var body: some View { + VStack { + switch currentView { + case .textToImage: TextToImage().transition(.opacity) + case .error(let message): ErrorPopover(errorMessage: message).transition(.move(edge: .top)) + case .loading: + // TODO: Don't present progress view if the pipeline is cached + ProgressView(preparationPhase, value: downloadProgress, total: 1).padding() + } + } + .animation(.easeIn, value: currentView) + .environmentObject(context) + .onAppear { + Task.init { + let loader = PipelineLoader(url: URL(string: PIPELINE_URL)!) + stateSubscriber = loader.statePublisher.sink { state in + DispatchQueue.main.async { + switch state { + case .downloading(let progress): + preparationPhase = "Downloading" + downloadProgress = progress + case .uncompressing: + preparationPhase = "Uncompressing" + downloadProgress = 1 + case .readyOnDisk: + preparationPhase = "Loading" + downloadProgress = 1 + default: + break + } + } + } + do { + context.pipeline = try await loader.prepare() + self.currentView = .textToImage + } catch { + self.currentView = .error("Could not load model, error: \(error)") + } + } + } + } +} + +// Required by .animation +extension LoadingView.CurrentView: Equatable {} + +struct ErrorPopover: View { + var errorMessage: String + + var body: some View { + Text(errorMessage) + .font(.headline) + .padding() + .foregroundColor(.red) + .background(Color.white) + .cornerRadius(8) + .shadow(color: Color.black.opacity(0.2), radius: 8, x: 0, y: 4) + } +} + +struct LoadingView_Previews: PreviewProvider { + static var previews: some View { + LoadingView() + } +} diff --git a/Diffusion/Views/TextToImage.swift b/Diffusion/Views/TextToImage.swift new file mode 100644 index 0000000..984337f --- /dev/null +++ b/Diffusion/Views/TextToImage.swift @@ -0,0 +1,104 @@ +// +// TextToImage.swift +// Diffusion +// +// Created by Pedro Cuenca on December 2022. +// See LICENSE at https://github.com/huggingface/swift-coreml-diffusers/LICENSE +// + +import SwiftUI +import Combine +import StableDiffusion + +// TODO: bind to UI controls +let scheduler = StableDiffusionScheduler.dpmpp +let steps = 25 +let seed: UInt32? = nil + +func generate(pipeline: Pipeline?, prompt: String) async -> CGImage? { + guard let pipeline = pipeline else { return nil } + return try? pipeline.generate(prompt: prompt, scheduler: scheduler, numInferenceSteps: steps, seed: seed) +} + +enum GenerationState { + case startup + case running(StableDiffusionProgress?) + case idle +} + +struct ImageWithPlaceholder: View { + var image: Binding + var state: Binding + + var body: some View { + switch state.wrappedValue { + case .startup: return AnyView(Image("placeholder").resizable()) + case .running(let progress): + guard let progress = progress, progress.stepCount > 0 else { + // The first time it takes a little bit before generation starts + return AnyView(ProgressView()) + } + let step = Int(progress.step) + 1 + let fraction = Double(step) / Double(progress.stepCount) + let label = "Step \(step) of \(progress.stepCount)" + return AnyView(ProgressView(label, value: fraction, total: 1).padding()) + default: + guard let theImage = image.wrappedValue else { + return AnyView(Image(systemName: "exclamationmark.triangle").resizable()) + } + + let imageView = Image(theImage, scale: 1, label: Text("generated")) + return AnyView( + VStack { + imageView.resizable().clipShape(RoundedRectangle(cornerRadius: 20)) + ShareLink(item: imageView, preview: SharePreview("Generated image", image: imageView)) + }) + } + } +} + +struct TextToImage: View { + @EnvironmentObject var context: DiffusionGlobals + + @State private var prompt = "Labrador in the style of Vermeer" + @State private var image: CGImage? = nil + @State private var state: GenerationState = .startup + + @State private var progressSubscriber: Cancellable? + + func submit() { + if case .running = state { return } + Task { + state = .running(nil) + image = await generate(pipeline: context.pipeline, prompt: prompt) + state = .idle + } + } + + var body: some View { + VStack { + HStack { + TextField("Prompt", text: $prompt) + .textFieldStyle(.roundedBorder) + .onSubmit { + submit() + } + Button("Generate") { + submit() + } + .padding() + .buttonStyle(.borderedProminent) + } + ImageWithPlaceholder(image: $image, state: $state) + .scaledToFit() + Spacer() + } + .padding() + .onAppear { + progressSubscriber = context.pipeline!.progressPublisher.sink { progress in + guard let progress = progress else { return } + state = .running(progress) + } + } + } +} diff --git a/DiffusionTests/DiffusionTests.swift b/DiffusionTests/DiffusionTests.swift new file mode 100644 index 0000000..8636847 --- /dev/null +++ b/DiffusionTests/DiffusionTests.swift @@ -0,0 +1,35 @@ +// +// DiffusionTests.swift +// DiffusionTests +// +// Created by Pedro Cuenca on December 2022. +// + +import XCTest + +final class DiffusionTests: XCTestCase { + + override func setUpWithError() throws { + // Put setup code here. This method is called before the invocation of each test method in the class. + } + + override func tearDownWithError() throws { + // Put teardown code here. This method is called after the invocation of each test method in the class. + } + + func testExample() throws { + // This is an example of a functional test case. + // Use XCTAssert and related functions to verify your tests produce the correct results. + // Any test you write for XCTest can be annotated as throws and async. + // Mark your test throws to produce an unexpected failure when your test encounters an uncaught error. + // Mark your test async to allow awaiting for asynchronous code to complete. Check the results with assertions afterwards. + } + + func testPerformanceExample() throws { + // This is an example of a performance test case. + measure { + // Put the code you want to measure the time of here. + } + } + +} diff --git a/DiffusionUITests/DiffusionUITests.swift b/DiffusionUITests/DiffusionUITests.swift new file mode 100644 index 0000000..79cbb2f --- /dev/null +++ b/DiffusionUITests/DiffusionUITests.swift @@ -0,0 +1,41 @@ +// +// DiffusionUITests.swift +// DiffusionUITests +// +// Created by Pedro Cuenca on December 2022. +// + +import XCTest + +final class DiffusionUITests: XCTestCase { + + override func setUpWithError() throws { + // Put setup code here. This method is called before the invocation of each test method in the class. + + // In UI tests it is usually best to stop immediately when a failure occurs. + continueAfterFailure = false + + // In UI tests it’s important to set the initial state - such as interface orientation - required for your tests before they run. The setUp method is a good place to do this. + } + + override func tearDownWithError() throws { + // Put teardown code here. This method is called after the invocation of each test method in the class. + } + + func testExample() throws { + // UI tests must launch the application that they test. + let app = XCUIApplication() + app.launch() + + // Use XCTAssert and related functions to verify your tests produce the correct results. + } + + func testLaunchPerformance() throws { + if #available(macOS 10.15, iOS 13.0, tvOS 13.0, watchOS 7.0, *) { + // This measures how long it takes to launch your application. + measure(metrics: [XCTApplicationLaunchMetric()]) { + XCUIApplication().launch() + } + } + } +} diff --git a/DiffusionUITests/DiffusionUITestsLaunchTests.swift b/DiffusionUITests/DiffusionUITestsLaunchTests.swift new file mode 100644 index 0000000..f301f0d --- /dev/null +++ b/DiffusionUITests/DiffusionUITestsLaunchTests.swift @@ -0,0 +1,32 @@ +// +// DiffusionUITestsLaunchTests.swift +// DiffusionUITests +// +// Created by Pedro Cuenca on December 2022. +// + +import XCTest + +final class DiffusionUITestsLaunchTests: XCTestCase { + + override class var runsForEachTargetApplicationUIConfiguration: Bool { + true + } + + override func setUpWithError() throws { + continueAfterFailure = false + } + + func testLaunch() throws { + let app = XCUIApplication() + app.launch() + + // Insert steps here to perform after app launch but before taking a screenshot, + // such as logging into a test account or navigating somewhere in the app + + let attachment = XCTAttachment(screenshot: app.screenshot()) + attachment.name = "Launch Screen" + attachment.lifetime = .keepAlways + add(attachment) + } +} diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..e524e5f --- /dev/null +++ b/LICENSE @@ -0,0 +1,201 @@ + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. 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We also recommend that a + file or class name and description of purpose be included on the + same "printed page" as the copyright notice for easier + identification within third-party archives. + + Copyright 2022 Hugging Face SAS. + + Licensed under the Apache License, Version 2.0 (the "License"); + you may not use this file except in compliance with the License. + You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. diff --git a/README.md b/README.md new file mode 100644 index 0000000..32140b6 --- /dev/null +++ b/README.md @@ -0,0 +1,23 @@ +# Diffusion + +This is a simple app that shows how to integrate Apple's [Core ML Stable Diffusion implementation](https://github.com/apple/ml-stable-diffusion) in a native Swift UI application. It can be used for faster iteration, or as sample code for other use cases. + +On first launch, the application downloads a zipped archive with a Core ML version of Runway's Stable Diffusion v1.5, from [this location in the Hugging Face Hub](https://huggingface.co/pcuenq/coreml-stable-diffusion/tree/main). This process takes a while, as several GB of data have to be downloaded and unarchived. + +For faster inference, we use a very fast scheduler: [DPM-Solver++](https://github.com/LuChengTHU/dpm-solver) that we ported to Swift. Since this scheduler is still not available in Apple's GitHub repository, the application depends on the following fork instead: https://github.com/pcuenca/ml-stable-diffusion. Our Swift port is based on [Diffusers' DPMSolverMultistepScheduler](https://github.com/huggingface/diffusers/blob/main/src/diffusers/schedulers/scheduling_dpmsolver_multistep.py), with a number of simplifications. + +## Limitations + +- Requires the latest betas of iOS 16.2, macOS Ventura 13.1, Xcode 14.2. They are all in the Release Candidate stage. +- Although the app is platform independent, execution fails on iPhone 13 Pro, possibly due to memory constraints. We haven't tested on M2 iPads with 8 or 16 GB of memory. +- The UI does not expose a way to configure the scheduler, number of inference steps, or generation seed. These are all available in the underlying code. +- A single model (Stable Diffusion v1.5) is considered. The Core ML compute units have been hardcoded to CPU and GPU, since that's what gives best results on my Mac (M1 Max MacBook Pro). +- Sometimes generation returns a `nil` image. This needs to be investigated. + +## Next Steps + +- Improve UI. Allow the user to select generation parameters. +- Allow other models to run. Provide a recommended "compute units" configuration based on model and platform. +- Implement other interesting schedulers. +- Implement negative prompts. +- Explore other features (image to image, for example).