Allow all compute units to be selected (#30)

* Allow all compute units to be selected by the user.

* Remove commented code.

* Simplify labels.

* Remove warning

* Align picker left

* Apply suggestions from code review

Diffusion-macOS/ControlsView.swift

@@ -57,7 +57,6 @@ struct ControlsView: View {
     @State private var disclosedSteps = false
     @State private var disclosedSeed = false
     @State private var disclosedAdvanced = false
-    @State private var useANE = (Settings.shared.userSelectedAttentionVariant ?? ModelInfo.defaultAttention) == .splitEinsum
 
     // TODO: refactor download with similar code in Loading.swift (iOS)
     @State private var stateSubscriber: Cancellable?
@@ -82,14 +81,18 @@ struct ControlsView: View {
         mustShowSafetyCheckerDisclaimer = generation.disableSafety && !Settings.shared.safetyCheckerDisclaimerShown
     }
     
-    func updateANEState() {
-        Settings.shared.userSelectedAttentionVariant = useANE ? .splitEinsum : .original
+    func updateComputeUnitsState() {
+        Settings.shared.userSelectedComputeUnits = generation.computeUnits
         modelDidChange(model: Settings.shared.currentModel)
     }
     
+    func resetComputeUnitsState() {
+        generation.computeUnits = Settings.shared.userSelectedComputeUnits ?? ModelInfo.defaultComputeUnits
+    }
+    
     func modelDidChange(model: ModelInfo) {
-        guard pipelineLoader?.model != model || pipelineLoader?.variant != Settings.shared.userSelectedAttentionVariant else {
-            print("Reusing same model \(model) with attention \(String(describing: Settings.shared.userSelectedAttentionVariant))")
+        guard pipelineLoader?.model != model || pipelineLoader?.computeUnits != generation.computeUnits else {
+            print("Reusing same model \(model) with units \(generation.computeUnits)")
             return
         }
 
@@ -99,7 +102,7 @@ struct ControlsView: View {
         pipelineLoader?.cancel()
         pipelineState = .downloading(0)
         Task.init {
-            let loader = PipelineLoader(model: model, variant: Settings.shared.userSelectedAttentionVariant, maxSeed: maxSeed)
+            let loader = PipelineLoader(model: model, computeUnits: generation.computeUnits, maxSeed: maxSeed)
             self.pipelineLoader = loader
             stateSubscriber = loader.statePublisher.sink { state in
                 DispatchQueue.main.async {
@@ -128,8 +131,8 @@ struct ControlsView: View {
         }
     }
     
-    func isModelDownloaded(_ model: ModelInfo, variant: AttentionVariant? = nil) -> Bool {
-        PipelineLoader(model: model, variant: variant ?? Settings.shared.userSelectedAttentionVariant).ready
+    func isModelDownloaded(_ model: ModelInfo, computeUnits: ComputeUnits? = nil) -> Bool {
+        PipelineLoader(model: model, computeUnits: computeUnits ?? generation.computeUnits).ready
     }
     
     func modelLabel(_ model: ModelInfo) -> Text {
@@ -301,21 +304,25 @@ struct ControlsView: View {
                         Divider()
                         DisclosureGroup(isExpanded: $disclosedAdvanced) {
                             HStack {
-                                Toggle("Use Neural Engine", isOn: $useANE).onChange(of: useANE) { value in
+                                Picker(selection: $generation.computeUnits, label: Text("Use")) {
+                                    Text("GPU").tag(ComputeUnits.cpuAndGPU)
+                                    Text("Neural Engine").tag(ComputeUnits.cpuAndNeuralEngine)
+                                    Text("GPU and Neural Engine").tag(ComputeUnits.all)
+                                }.pickerStyle(.radioGroup).padding(.leading)
+                                Spacer()
+                            }
+                            .onChange(of: generation.computeUnits) { units in
                                 guard let currentModel = ModelInfo.from(modelVersion: model) else { return }
-                                    let variantDownloaded = isModelDownloaded(currentModel, variant: useANE ? .splitEinsum : .original)
+                                let variantDownloaded = isModelDownloaded(currentModel, computeUnits: units)
                                 if variantDownloaded {
-                                        updateANEState()
+                                    updateComputeUnitsState()
                                 } else {
                                     mustShowModelDownloadDisclaimer.toggle()
                                 }
                             }
-                                .padding(.leading, 10)
-                                Spacer()
-                            }
                             .alert("Download Required", isPresented: $mustShowModelDownloadDisclaimer, actions: {
-                                Button("Cancel", role: .destructive) { useANE.toggle() }
-                                Button("Download", role: .cancel) { updateANEState() }
+                                Button("Cancel", role: .destructive) { resetComputeUnitsState() }
+                                Button("Download", role: .cancel) { updateComputeUnitsState() }
                             }, message: {
                                 Text("This setting requires a new version of the selected model.")
                             })

Diffusion/ModelInfo.swift

@@ -13,6 +13,10 @@ enum AttentionVariant: String {
     case splitEinsum
 }
 
+extension AttentionVariant {
+    var defaultComputeUnits: MLComputeUnits { self == .original ? .cpuAndGPU : .cpuAndNeuralEngine }
+}
+
 struct ModelInfo {
     /// Hugging Face model Id that contains .zip archives with compiled Core ML models
     let modelId: String
@@ -39,6 +43,7 @@ struct ModelInfo {
 }
 
 extension ModelInfo {
+    //TODO: set compute units instead and derive variant from it
     static var defaultAttention: AttentionVariant {
         guard runningOnMac else { return .splitEinsum }
         #if os(macOS)
@@ -49,9 +54,10 @@ extension ModelInfo {
         #endif
     }
     
-    var bestAttention: AttentionVariant {
-        return ModelInfo.defaultAttention
-    }
+    static var defaultComputeUnits: MLComputeUnits { defaultAttention.defaultComputeUnits }
+    
+    var bestAttention: AttentionVariant { ModelInfo.defaultAttention }
+    var defaultComputeUnits: MLComputeUnits { bestAttention.defaultComputeUnits }
     
     func modelURL(for variant: AttentionVariant) -> URL {
         // Pattern: https://huggingface.co/pcuenq/coreml-stable-diffusion/resolve/main/coreml-stable-diffusion-v1-5_original_compiled.zip

Diffusion/Pipeline/PipelineLoader.swift

@@ -18,14 +18,14 @@ class PipelineLoader {
     static let models = Path.applicationSupport / "hf-diffusion-models"
     
     let model: ModelInfo
-    let variant: AttentionVariant
+    let computeUnits: ComputeUnits
     let maxSeed: UInt32
     
     private var downloadSubscriber: Cancellable?
 
-    init(model: ModelInfo, variant: AttentionVariant? = nil, maxSeed: UInt32 = UInt32.max) {
+    init(model: ModelInfo, computeUnits: ComputeUnits? = nil, maxSeed: UInt32 = UInt32.max) {
         self.model = model
-        self.variant = variant ?? model.bestAttention
+        self.computeUnits = computeUnits ?? model.defaultComputeUnits
         self.maxSeed = maxSeed
         state = .undetermined
         setInitialState()
@@ -98,9 +98,15 @@ extension PipelineLoader {
         return compiledPath.exists
     }
     
-    // TODO: measure performance on different devices, disassociate from variant
-    var computeUnits: MLComputeUnits {
-        variant == .original ? .cpuAndGPU : .cpuAndNeuralEngine
+    var variant: AttentionVariant {
+        switch computeUnits {
+        case .cpuOnly           : return .original          // Not supported yet
+        case .cpuAndGPU         : return .original
+        case .cpuAndNeuralEngine: return .splitEinsum
+        case .all               : return .splitEinsum
+        @unknown default:
+            fatalError("Unknown MLComputeUnits")
+        }
     }
     
     // TODO: maybe receive Progress to add another progress as child

Diffusion/State.swift

@@ -9,6 +9,7 @@
 import Combine
 import SwiftUI
 import StableDiffusion
+import CoreML
 
 let DEFAULT_MODEL = ModelInfo.v2Base
 let DEFAULT_PROMPT = "Labrador in the style of Vermeer"
@@ -21,6 +22,8 @@ enum GenerationState {
     case failed(Error)
 }
 
+typealias ComputeUnits = MLComputeUnits
+
 class GenerationContext: ObservableObject {
     let scheduler = StableDiffusionScheduler.dpmSolverMultistepScheduler
 
@@ -49,6 +52,8 @@ class GenerationContext: ObservableObject {
     @Published var guidanceScale = 7.5
     @Published var disableSafety = false
     
+    @Published var computeUnits: ComputeUnits = Settings.shared.userSelectedComputeUnits ?? ModelInfo.defaultComputeUnits
+
     private var progressSubscriber: Cancellable?
 
     func generate() async throws -> GenerationResult {
@@ -78,14 +83,14 @@ class Settings {
     enum Keys: String {
         case model
         case safetyCheckerDisclaimer
-        case variant
+        case computeUnits
     }
     
     private init() {
         defaults.register(defaults: [
             Keys.model.rawValue: ModelInfo.v2Base.modelId,
             Keys.safetyCheckerDisclaimer.rawValue: false,
-            Keys.variant.rawValue: "- default -"
+            Keys.computeUnits.rawValue: -1      // Use default
         ])
     }
     
@@ -109,15 +114,16 @@ class Settings {
     }
     
     /// Returns the option selected by the user, if overridden
-    /// `nil` means: guess best for this {model, device}
-    var userSelectedAttentionVariant: AttentionVariant? {
+    /// `nil` means: guess best
+    var userSelectedComputeUnits: ComputeUnits? {
         set {
-            // Any String other than the supported ones would cause `get` to return `nil`
-            defaults.set(newValue?.rawValue ?? "- default -", forKey: Keys.variant.rawValue)
+            // Any value other than the supported ones would cause `get` to return `nil`
+            defaults.set(newValue?.rawValue ?? -1, forKey: Keys.computeUnits.rawValue)
         }
         get {
-            let current = defaults.string(forKey: Keys.variant.rawValue)
-            return AttentionVariant(rawValue: current ?? "")
+            let current = defaults.integer(forKey: Keys.computeUnits.rawValue)
+            guard current != -1 else { return nil }
+            return ComputeUnits(rawValue: current)
         }
     }
 }