MNN/apps/iOS/MNNLLMChat

MNNLLM iOS Application

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Introduction

This project is an iOS application based on the MNN engine, supporting local large-model multimodal conversations.

It operates fully offline with high privacy. Once the models are downloaded to the device, all conversations occur locally without any network uploads or processing.

Features

1. Model List

   • Browse models supported by MNN.
   • Manage models: download and delete models.
   • Support for switching between Hugging Face and ModelScope sources
   • Search for models locally.

2. Multimodal Chat: Supports full Markdown format output

   • Text-to-text conversation.
   • Audio-to-text conversation.
   • Image-to-text conversation: capture images via camera or select from the gallery.

3. Model Configuration

   • Support configuring mmap
   • Support configuring Sampling Strategy
   • Support configuring diffusion settings

4. Chat History

   • View conversation history, with the ability to restore previous chat sessions.

Video Introduction

Application Preview:

Text To Text	Image To Text	Audio To Text
Model List	History	History

Additionally, the app supports edge-side usage of DeepSeek with Think mode:

How to Build and Use

1. Clone the repository:

   git clone https://github.com/alibaba/MNN.git
   

2. Build the MNN.framework:

   sh package_scripts/ios/buildiOS.sh "
   -DMNN_ARM82=ON
   -DMNN_LOW_MEMORY=ON
   -DMNN_SUPPORT_TRANSFORMER_FUSE=ON
   -DMNN_BUILD_LLM=ON
   -DMNN_CPU_WEIGHT_DEQUANT_GEMM=ON
   -DMNN_METAL=ON
   -DMNN_BUILD_DIFFUSION=ON
   -DMNN_OPENCL=OFF
   -DMNN_SEP_BUILD=OFF
   -DLLM_SUPPORT_AUDIO=ON
   -DMNN_BUILD_AUDIO=ON
   -DLLM_SUPPORT_VISION=ON
   -DMNN_BUILD_OPENCV=ON
   -DMNN_IMGCODECS=ON
   "
   

3. Copy the framework to the iOS project:

   mv MNN-iOS-CPU-GPU/Static/MNN.framework apps/iOS/MNNLLMChat
   

   Ensure the Link Binary With Libraries section includes the MNN.framework:

   

   If it's missing, add it manually:

   

4. Update iOS signing and build the project:

   cd apps/iOS/MNNLLMChat
   open MNNLLMiOS.xcodeproj
   

   In Xcode, go to Signing & Capabilities > Team and input your Apple ID and Bundle Identifier:

   

   Wait for the Swift Package to finish downloading before building.

Notes

Due to memory limitations on iPhones, it is recommended to use models with 7B parameters or fewer to avoid memory-related crashes.

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Local Debugging

If we want to directly download the models to the computer for debugging without downloading them through the app, we can follow these steps:

1. First, download the MNN-related models from Hugging Face or Modelscope:

   

2. After downloading, drag all the files from the model folder into the project's LocalModel folder:

   

3. Ensure that the above files are included in the Copy Bundle Resources section:

   

4. Comment out the model download code:

   /*
   try await modelClient.downloadModel(model: model) { progress in
       Task { @MainActor in
           DispatchQueue.main.async {
               self.downloadProgress[model.modelId] = progress
           }
       }
   }
   */
   

5. Modify the Model Loading Method

   Modify the LLMInferenceEngineWrapper class:

   // BOOL success = [self loadModelFromPath:modelPath];
   // MARK: Test Local Model
   BOOL success = [self loadModel];
   

6. Run the project, navigate to the chat page, and perform model interactions and debugging.

Release Notes

Version 0.3.1

• Add support for model parameter configuration

| | | |

Version 0.3

New Features:

• Add support for downloading from the Modeler source
• Add support for Stable Diffusion text-to-image generation

| | |

Version 0.2

New Features:

• Add support for mmap configuration and manual cache clearing
• Add support for downloading models from the ModelScope source

| | |

References

• Exyte/Chat
• stephencelis/CSQLite
• swift-transformers