464 lines
17 KiB
Swift
464 lines
17 KiB
Swift
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import Foundation
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import CreateML
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final class ClassifierCreator {
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let server: URL
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let configuration: Configuration
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let imageDirectory: URL
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let thumbnailDirectory: URL
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let classifierUrl: URL
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let df = DateFormatter()
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// MARK: Step 1: Load configuration
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init(configuration: Configuration) throws {
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self.configuration = configuration
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self.server = try configuration.serverUrl()
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let contentDirectory = URL(fileURLWithPath: configuration.contentFolder)
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self.imageDirectory = contentDirectory.appendingPathComponent("images")
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self.classifierUrl = contentDirectory.appendingPathComponent("classifier.mlmodel")
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self.thumbnailDirectory = contentDirectory.appendingPathComponent("thumbnails")
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df.dateFormat = "yy-MM-dd-HH-mm-ss"
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}
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// MARK: Main function
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func run() async throws {
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let imagesSnapshotDate = Date()
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let (classes, changedImageCount, changedMainImages) = try await loadImages()
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guard !classes.isEmpty else {
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print("[INFO] No image classes found, exiting...")
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return
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}
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guard changedImageCount > 0 else {
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print("[INFO] No changed images, so no new classifier trained")
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await createThumbnails(changed: changedMainImages)
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print("[INFO] Done")
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return
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}
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let classifierVersion = try await getClassifierVersion()
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let newVersion = classifierVersion + 1
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print("[INFO] Image directory: \(imageDirectory.absoluteURL.path)")
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print("[INFO] Model path: \(classifierUrl.path)")
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print("[INFO] Version: \(newVersion)")
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print("[INFO] Classes: \(classes.count)")
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print("[INFO] Iterations: \(configuration.trainingIterations)")
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try trainModel()
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try await upload(version: newVersion)
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try await upload(classes: classes, lastUpdate: imagesSnapshotDate)
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await createThumbnails(changed: changedMainImages)
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print("[INFO] Done")
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}
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// MARK: Step 2: Load changed images
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func loadImages() async throws -> (classes: [Int], changedImageCount: Int, changedMainImages: [Int]) {
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guard createFolderIfMissing(imageDirectory) else {
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throw TrainingError.mainImageFolderNotCreated
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}
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let imageCounts = await getImageCounts()
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let missingImageList: [CapImage] = imageCounts
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.sorted { $0.key < $1.key }
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.reduce(into: []) { list, pair in
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let missingImagesForCap: [CapImage] = (0..<pair.value).compactMap { image in
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let image = CapImage(cap: pair.key, image: image)
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let url = imageUrl(base: imageDirectory, image: image)
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guard !FileManager.default.fileExists(atPath: url.path) else {
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return nil
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}
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return image
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}
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list.append(contentsOf: missingImagesForCap)
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}
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if missingImageList.isEmpty {
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print("[INFO] No missing images to load")
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} else {
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print("[INFO] Loading \(missingImageList.count) missing images...")
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try await loadImages(missingImageList)
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}
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let changedImageList = try await getChangedImageList()
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let filteredChangeList = changedImageList
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.filter { $0.image < imageCounts[$0.cap] ?? 0 } // Filter non-existent images
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.filter { !missingImageList.contains($0) }
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let imagesAlreadyLoad = changedImageList.count - filteredChangeList.count
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let suffix = imagesAlreadyLoad > 0 ? " (\(imagesAlreadyLoad) already loaded)" : ""
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if filteredChangeList.isEmpty {
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print("[INFO] No changed images to load" + suffix)
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} else {
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print("[INFO] Loading \(filteredChangeList.count) changed images" + suffix)
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try await loadImages(filteredChangeList)
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}
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let changedMainImages = changedImageList.filter { $0.image == 0 }.map { $0.cap }
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let classes = imageCounts.keys.sorted()
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// Delete any image folders not present as caps
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try deleteUnnecessaryImageFolders(caps: classes)
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return (classes, missingImageList.count + changedImageList.count, changedMainImages)
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}
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private func getImageCounts() async -> [Int : Int] {
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guard let data: Data = await get(server.appendingPathComponent("caps.json")) else {
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return [:]
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}
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do {
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return try JSONDecoder().decode([Cap].self, from: data)
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.reduce(into: [:]) { $0[$1.id] = $1.count }
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} catch {
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print("[ERROR] Failed to decode cap database: \(error)")
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return [:]
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}
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}
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private func deleteUnnecessaryImageFolders(caps: [Int]) throws {
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let validNames = caps.map { String(format: "%04d", $0) }
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let folders: [String]
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do {
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folders = try FileManager.default.contentsOfDirectory(atPath: imageDirectory.path)
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} catch {
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print("[ERROR] Failed to get list of image folders: \(error)")
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throw TrainingError.failedToGetListOfImageFolders
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}
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for folder in folders {
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if validNames.contains(folder) {
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continue
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}
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// Not a valid cap folder
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let url = imageDirectory.appendingPathComponent(folder)
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do {
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try FileManager.default.removeItem(at: url)
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print("[INFO] Removed unused image folder '\(folder)'")
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} catch {
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print("[ERROR] Failed to delete unused image folder \(folder): \(error)")
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throw TrainingError.failedToRemoveImageFolder
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}
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}
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}
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private func imageUrl(base: URL, image: CapImage) -> URL {
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base.appendingPathComponent(String(format: "%04d/%04d-%02d.jpg", image.cap, image.cap, image.image))
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}
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private func load(image: CapImage) async -> Bool {
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guard createFolderIfMissing(imageDirectory.appendingPathComponent(String(format: "%04d", image.cap))) else {
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return false
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}
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let url = imageUrl(base: server.appendingPathComponent("images"), image: image)
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let tempFile: URL, response: URLResponse
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do {
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(tempFile, response) = try await URLSession.shared.download(from: url)
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} catch {
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print("[ERROR] Failed to load \(image): \(error)")
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return false
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}
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let responseCode = (response as! HTTPURLResponse).statusCode
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guard responseCode == 200 else {
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print("[ERROR] Failed to load \(image): Response \(responseCode)")
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return false
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}
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do {
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let localUrl = imageUrl(base: imageDirectory, image: image)
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if FileManager.default.fileExists(atPath: localUrl.path) {
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try FileManager.default.removeItem(at: localUrl)
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}
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try FileManager.default.moveItem(at: tempFile, to: localUrl)
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return true
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} catch {
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print("[ERROR] Failed to save \(image): \(error)")
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return false
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}
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}
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private func loadImages(_ list: [CapImage]) async throws {
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var loadedImages = 0
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await withTaskGroup(of: Bool.self) { group in
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for image in list {
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group.addTask {
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await self.load(image: image)
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}
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}
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for await loaded in group {
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if loaded {
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loadedImages += 1
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}
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}
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}
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if loadedImages != list.count {
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print("[ERROR] Only \(loadedImages) of \(list.count) images loaded")
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throw TrainingError.failedToLoadImages
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}
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}
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func getChangedImageList() async throws -> [CapImage] {
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guard let string: String = await get(server.appendingPathComponent("changes.txt")) else {
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print("[ERROR] Failed to get list of changed images")
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throw TrainingError.failedToGetChangedImagesList
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}
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return string
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.components(separatedBy: "\n")
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.filter { $0 != "" }
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.compactMap {
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let parts = $0.components(separatedBy: ":")
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guard parts.count == 3 else {
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return nil
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}
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/*
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guard let date = df.date(from: parts[0]) else {
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print("[WARN] Invalid date \(parts[0]) in change list")
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return nil
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}
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*/
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guard let cap = Int(parts[1]) else {
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print("[WARN] Invalid cap id \(parts[1]) in change list")
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return nil
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}
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guard let image = Int(parts[2]) else {
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print("[WARN] Invalid image id \(parts[2]) in change list")
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return nil
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}
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return CapImage(cap: cap, image: image)
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}
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}
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// MARK: Step 3: Compute version
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func getClassifierVersion() async throws -> Int {
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guard let string: String = await get(server.appendingPathComponent("version")) else {
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print("[ERROR] Failed to get classifier version")
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throw TrainingError.failedToGetClassifierVersion
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}
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guard let version = Int(string) else {
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print("[ERROR] Invalid classifier version \(string)")
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throw TrainingError.invalidClassifierVersion(string)
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}
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return version
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}
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// MARK: Step 4: Train classifier
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func trainModel() throws {
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var params = MLImageClassifier.ModelParameters(augmentation: [])
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params.maxIterations = configuration.trainingIterations
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let model: MLImageClassifier
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do {
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model = try MLImageClassifier(
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trainingData: .labeledDirectories(at: imageDirectory),
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parameters: params)
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} catch {
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print("[ERROR] Failed to create classifier: \(error)")
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throw TrainingError.failedToCreateClassifier(error)
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}
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print("[INFO] Saving classifier...")
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do {
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try model.write(to: classifierUrl)
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} catch {
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print("[ERROR] Failed to save model to file: \(error)")
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throw TrainingError.failedToWriteClassifier(error)
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}
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}
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// MARK: Step 5: Upload classifier
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func upload(version: Int) async throws {
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print("[INFO] Uploading classifier...")
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let modelData: Data
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do {
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modelData = try Data(contentsOf: classifierUrl)
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} catch {
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print("[ERROR] Failed to read classifier data: \(error)")
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throw TrainingError.failedToReadClassifierData(error)
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}
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let success = await post(
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url: server.appendingPathComponent("classifier/\(version)"),
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body: modelData)
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guard success else {
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throw TrainingError.failedToUploadClassifier
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}
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}
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// MARK: Step 6: Update classes
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func upload(classes: [Int], lastUpdate: Date) async throws {
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print("[INFO] Uploading trained classes...")
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let dateString = df.string(from: lastUpdate)
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let url = server.appendingPathComponent("classes/\(dateString)")
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let body = classes.map(String.init).joined(separator: ",").data(using: .utf8)!
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guard await post(url: url, body: body) else {
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throw TrainingError.failedToUploadClassifierClasses
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}
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}
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// MARK: Step 7: Create thumbnails
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func createThumbnails(changed: [Int]) async {
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guard checkMagickAvailability() else {
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return
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}
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guard createFolderIfMissing(thumbnailDirectory) else {
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print("[ERROR] Failed to create folder for thumbnails")
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return
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}
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let capIdsOfMissingThumbnails = await getMissingThumbnailIds()
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let all = Set(capIdsOfMissingThumbnails).union(changed)
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print("[INFO] Creating \(all.count) thumbnails...")
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for cap in all {
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await createThumbnail(for: cap)
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}
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}
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func checkMagickAvailability() -> Bool {
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do {
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let (code, output) = try safeShell("magick --version")
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guard code == 0, let version = output.components(separatedBy: "ImageMagick ").dropFirst().first?
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.components(separatedBy: " ").first else {
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print("[ERROR] Magick not found, install using 'brew install imagemagick'")
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return false
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}
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print("[INFO] Using magick \(version)")
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} catch {
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print("[ERROR] Failed to get version of magick: (\(error))")
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return false
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}
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return true
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}
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private func getMissingThumbnailIds() async -> [Int] {
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guard let string: String = await get(server.appendingPathComponent("thumbnails/missing")) else {
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print("[ERROR] Failed to get missing thumbnails")
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return []
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}
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return string.components(separatedBy: ",").compactMap(Int.init)
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}
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private func createThumbnail(for cap: Int) async {
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let mainImage = CapImage(cap: cap, image: 0)
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let inputUrl = imageUrl(base: imageDirectory, image: mainImage)
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guard FileManager.default.fileExists(atPath: inputUrl.path) else {
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print("[ERROR] Local main image not found for cap \(cap): \(inputUrl.path)")
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return
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}
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let output = thumbnailDirectory.appendingPathComponent(String(format: "%04d.jpg", cap))
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do {
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let command = "magick convert \(inputUrl.path) -quality 70% -resize 100x100 \(output.path)"
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let (code, output) = try safeShell(command)
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if code != 0 {
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print("Failed to create thumbnail for cap \(cap): \(output)")
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return
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}
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} catch {
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print("Failed to read created thumbnail for cap \(cap): \(error)")
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return
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}
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let data: Data
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do {
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data = try Data(contentsOf: output)
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} catch {
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print("Failed to read created thumbnail for cap \(cap): \(error)")
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return
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}
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guard await post(url: server.appendingPathComponent("thumbnails/\(cap)"), body: data) else {
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print("Failed to upload thumbnail for cap \(cap)")
|
||
|
|
return
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// MARK: Helper
|
||
|
|
|
||
|
|
@discardableResult
|
||
|
|
private func safeShell(_ command: String) throws -> (code: Int32, output: String) {
|
||
|
|
let task = Process()
|
||
|
|
let pipe = Pipe()
|
||
|
|
|
||
|
|
task.standardOutput = pipe
|
||
|
|
task.standardError = pipe
|
||
|
|
task.arguments = ["-cl", command]
|
||
|
|
task.executableURL = URL(fileURLWithPath: "/bin/zsh")
|
||
|
|
task.standardInput = nil
|
||
|
|
|
||
|
|
try task.run()
|
||
|
|
task.waitUntilExit()
|
||
|
|
|
||
|
|
let data = pipe.fileHandleForReading.readDataToEndOfFile()
|
||
|
|
let output = String(data: data, encoding: .utf8)!
|
||
|
|
return (task.terminationStatus, output)
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
private func createFolderIfMissing(_ folder: URL) -> Bool {
|
||
|
|
guard !FileManager.default.fileExists(atPath: folder.path) else {
|
||
|
|
return true
|
||
|
|
}
|
||
|
|
do {
|
||
|
|
try FileManager.default.createDirectory(at: folder, withIntermediateDirectories: true)
|
||
|
|
return true
|
||
|
|
} catch {
|
||
|
|
print("[ERROR] Failed to create directory \(folder.path): \(error)")
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// MARK: Requests
|
||
|
|
|
||
|
|
private func post(url: URL, body: Data) async -> Bool {
|
||
|
|
var request = URLRequest(url: url)
|
||
|
|
request.httpMethod = "POST"
|
||
|
|
request.httpBody = body
|
||
|
|
request.addValue(configuration.authenticationToken, forHTTPHeaderField: "key")
|
||
|
|
return await perform(request) != nil
|
||
|
|
}
|
||
|
|
|
||
|
|
private func perform(_ request: URLRequest) async -> Data? {
|
||
|
|
let data: Data
|
||
|
|
let response: URLResponse
|
||
|
|
do {
|
||
|
|
(data, response) = try await URLSession.shared.data(for: request)
|
||
|
|
} catch {
|
||
|
|
print("[ERROR] Request to \(request.url!.absoluteString) failed: \(error)")
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
let code = (response as! HTTPURLResponse).statusCode
|
||
|
|
guard code == 200 else {
|
||
|
|
print("[ERROR] Request to \(request.url!.absoluteString): Invalid response \(code)")
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
return data
|
||
|
|
}
|
||
|
|
|
||
|
|
private func get(_ url: URL) async -> Data? {
|
||
|
|
await perform(URLRequest(url: url))
|
||
|
|
}
|
||
|
|
|
||
|
|
private func get(_ url: URL) async -> String? {
|
||
|
|
guard let data: Data = await get(url) else {
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
guard let string = String(data: data, encoding: .utf8) else {
|
||
|
|
print("[ERROR] Invalid string response \(data)")
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
return string
|
||
|
|
}
|
||
|
|
}
|