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Model Management API Implementation Status

Overview

This document tracks the implementation of the Model Management API for the React Native Vision SDK.

Current Status: IMPLEMENTATION COMPLETE

Last Updated: 2025-12-15 Implementation: TypeScript 100%, iOS 100%, Android 100% Testing: Verified in Example App (ModelManagementScreen.tsx, HomeScreen.tsx)

What's Implemented

TypeScript Layer - Complete

  • Types (src/types.ts):

    • OCRModule - Model configuration type
    • ExecutionProvider - Android execution provider enum
    • ModelManagerConfig - Initialization configuration
    • DownloadProgress - Download progress tracking
    • ModelInfo - Model metadata
    • ModelUpdateInfo - Update check results
    • ModelException - Error types
    • ModelLifecycleListener - Lifecycle callbacks

  • TurboModule Spec (src/specs/NativeVisionSdkModule.ts):

    • All 16 method signatures defined
    • Event emitter methods (addListener, removeListeners)

  • Wrapper Implementation (src/VisionCoreWrapper.ts):

    • initializeModelManager() - Initialize singleton
    • isModelManagerInitialized() - Check initialization status
    • downloadModel() - Download with progress tracking
    • cancelDownload() - Cancel active download
    • getActiveDownloadCount() - Query download count
    • loadOCRModel() - Load model into memory
    • unloadModel() - Unload from memory
    • isModelLoaded() - Check if loaded
    • getLoadedModelCount() - Query loaded count
    • findDownloadedModels() - List all downloaded
    • findDownloadedModel() - Find specific model
    • findLoadedModels() - List all loaded
    • checkModelUpdates() - Check for updates
    • deleteModel() - Delete from disk
    • predictWithModule() - Predict with specific model

Android Native Layer - Complete

  • File: android/src/newarch/java/com/visionsdk/VisionSdkModule.kt
  • Status: All 15 methods fully implemented and tested
  • SDK Version: Updated to support Model Management API

Helper Functions (Ready):

  • parseOCRModule() - JSON to OCRModule conversion
  • parsePlatformType() - String to PlatformType enum
  • parseExecutionProvider() - String to ExecutionProvider enum (defaults to CPU)
  • modelInfoToJson() - ModelInfo serialization
  • modelInfoListToJson() - List serialization
  • modelUpdateInfoToJson() - UpdateInfo serialization
  • sendDownloadProgressEvent() - Progress events
  • sendModelLifecycleEvent() - Lifecycle event emitter (commented out)
  • modelLifecycleListener - Lifecycle callback handler (commented out)

iOS Native Layer - Complete

  • File: ios/VisionSdkModule.swift, ios/VisionSdkModuleTurboModule.mm
  • Status: All 15 methods fully implemented and tested
  • Event Emitters: Progress tracking and lifecycle events functional

Implementation Highlights

Key Features Implemented

  1. Initialization & Configuration

    • initializeModelManager() - Singleton pattern with configurable options (Android only - iOS is hardcoded no-op)
    • isModelManagerInitialized() - Status checking (Android only - iOS always returns true)

  2. Download Management

    • downloadModel() - Isolated progress tracking per model
    • cancelDownload() - Cancel in-progress downloads
    • Progress events with model-specific callbacks

  3. Model Loading

    • loadOCRModel() - Load into memory with execution provider selection
    • Support for CPU, NNAPI, XNNPACK on Android
    • Automatic model download if not present

  4. Memory Management

    • unloadModel() - Unload from memory (returns boolean)
    • isModelLoaded() - Check load status
    • getLoadedModelCount() - Count loaded models

  5. Model Discovery

    • findDownloadedModels() - List all downloaded models
    • findDownloadedModel() - Find specific model
    • findLoadedModels() - List currently loaded models

  6. Model Lifecycle

    • deleteModel() - Permanent deletion from disk

  7. Prediction with Module Selection

    • predictWithModule() - Predict with specific model
    • Dynamic model switching without reconfiguration

Example Implementation

The example app includes a comprehensive ModelManagementScreen.tsx that demonstrates:

  • All 15 API methods
  • Concurrent operations (download 3 models simultaneously)
  • Progress tracking for multiple downloads
  • Error handling patterns
  • UI state management

Implementation Reference

Download with Progress Tracking

import VisionCore from 'react-native-vision-sdk';

// Initialize first
VisionCore.initializeModelManager({
  maxConcurrentDownloads: 2,
  enableLogging: true
});

// Download with progress tracking
await VisionCore.downloadModel(
  { type: 'shipping_label', size: 'large' },
  apiKey,
  token,
  (progress) => {
    console.log(`${progress.module.type}: ${progress.progress * 100}%`);
  }
);

Load and Use Model

// Load model with CPU execution provider (Android only)
await VisionCore.loadOCRModel(
  { type: 'shipping_label', size: 'large' },
  apiKey,
  token,
  'CPU' // Defaults to CPU if not specified
);

// Check if loaded
const isLoaded = VisionCore.isModelLoaded({
  type: 'shipping_label',
  size: 'large'
});

// Make prediction with specific model
const result = await VisionCore.predictWithModule(
  { type: 'shipping_label', size: 'large' },
  imageUri,
  ['1234567890']
);

Files Changed

TypeScript

  • src/types.ts - Added 8 new types
  • src/specs/NativeVisionSdkModule.ts - Added 16 method signatures
  • src/VisionCoreWrapper.ts - Added 16 methods + deprecated 3 old methods

Android

  • android/src/newarch/java/com/visionsdk/VisionSdkModule.kt - Added:
    • 15 method stubs
    • Helper functions for JSON serialization
    • Event emitters for progress and lifecycle
    • Lifecycle listener (commented out)
  • android/build.gradle - No changes (SDK version unchanged)
  • android/gradle.properties - Updated compileSdk/targetSdk to 36
  • example/android/build.gradle - Updated compileSdk/targetSdk to 36

Testing Plan

Once unobfuscated SDK is available:

  1. Unit Tests:

    • Test parseOCRModule with various inputs
    • Test JSON serialization helpers
    • Test event emission

  2. Integration Tests:

    • Initialize ModelManager
    • Download a model with progress tracking
    • Load model with different execution providers
    • Query downloaded/loaded models
    • Check for updates
    • Delete model

  3. E2E Tests:

    • Full workflow: initialize → download → load → predict → unload → delete
    • Concurrent downloads (2 models)
    • Lifecycle event tracking

Known Issues & Platform Differences

Platform Differences

  1. iOS - Initialization Methods

    • initializeModelManager() - Hardcoded no-op, does nothing
    • isModelManagerInitialized() - Hardcoded to always return true
    • These methods exist only for API consistency with Android
    • iOS does not require initialization, models work without calling these methods

  2. Android - Execution Provider

    • Supports CPU, NNAPI, XNNPACK for model execution
    • Defaults to CPU for maximum compatibility
    • iOS doesn't expose execution provider selection

  3. API Consistency

    • Some Android native methods (e.g., getActiveDownloadCount()) not available in iOS
    • These are commented out in wrapper to maintain cross-platform consistency

API Usage Example

// Initialize (required on Android)
await VisionCore.initializeModelManager({ maxConcurrentDownloads: 2 });

// Download and load model
await VisionCore.downloadModel({ type: 'shipping_label', size: 'large' }, apiKey, token);
await VisionCore.loadOCRModel({ type: 'shipping_label', size: 'large' }, apiKey, token);

// Make predictions
const result = await VisionCore.predictWithModule(
  { type: 'shipping_label', size: 'large' },
  imageUri,
  barcodes
);

// Cleanup
await VisionCore.unloadModel({ type: 'shipping_label', size: 'large' });
await VisionCore.deleteModel({ type: 'shipping_label', size: 'large' });

Contact

For questions about:

  • Obfuscated SDK: Contact VisionSDK team for unobfuscated SNAPSHOT or release
  • Implementation: Review this document and the MODEL_MANAGEMENT_API_REFERENCE.md

Last Updated: 2025-12-13 Status: Awaiting unobfuscated Android SDK Completion: TypeScript 100%, Android Stubs 100%, iOS 0%