LLamaSharp/LLama.Examples/Examples/LlavaInteractiveModeExecute.cs

using System.Text.RegularExpressions;
using LLama.Batched;
using LLama.Common;
using Spectre.Console;

namespace LLama.Examples.Examples
{
    // This example shows how to chat with LLaVA model with both image and text as input.
    // It uses the interactive executor to inference.
    public class LlavaInteractiveModeExecute
    {
        public static async Task Run()
        {
            string multiModalProj = UserSettings.GetMMProjPath();
            string modelPath = UserSettings.GetModelPath();
            string modelImage = UserSettings.GetImagePath();
            const int maxTokens = 1024;

            var prompt = $"{{{modelImage}}}\nUSER:\nProvide a full description of the image.\nASSISTANT:\n";

            var parameters = new ModelParams(modelPath)
            {
                ContextSize = 4096,
                Seed = 1337,
            };
            using var model = LLamaWeights.LoadFromFile(parameters);
            using var context = model.CreateContext(parameters);
            
            // Llava Init
            using var clipModel = LLavaWeights.LoadFromFile(multiModalProj);
            
            var ex = new InteractiveExecutor(context, clipModel );

            Console.ForegroundColor = ConsoleColor.Yellow;
            Console.WriteLine("The executor has been enabled. In this example, the prompt is printed, the maximum tokens is set to {0} and the context size is {1}.", maxTokens, parameters.ContextSize );
            Console.WriteLine("To send an image, enter its filename in curly braces, like this {c:/image.jpg}.");  

            var inferenceParams = new InferenceParams() { Temperature = 0.1f, AntiPrompts = new List<string> { "\nUSER:" }, MaxTokens = maxTokens };

            do
            {
                
                // Evaluate if we have images
                //
                var imageMatches = Regex.Matches(prompt, "{([^}]*)}").Select(m => m.Value);
                var imageCount = imageMatches.Count();
                var hasImages = imageCount > 0;
                byte[][] imageBytes = null;

                if (hasImages)
                {
                    var imagePathsWithCurlyBraces = Regex.Matches(prompt, "{([^}]*)}").Select(m => m.Value);
                    var imagePaths = Regex.Matches(prompt, "{([^}]*)}").Select(m => m.Groups[1].Value);

                    try
                    {
                        imageBytes = imagePaths.Select(File.ReadAllBytes).ToArray();
                    }
                    catch (IOException exception)
                    {
                        Console.ForegroundColor = ConsoleColor.Red;
                        Console.Write(
                            $"Could not load your {(imageCount == 1 ? "image" : "images")}:");
                        Console.Write($"{exception.Message}");
                        Console.ForegroundColor = ConsoleColor.Yellow;
                        Console.WriteLine("Please try again.");
                        break;
                    }


                    int index = 0;
                    foreach (var path in imagePathsWithCurlyBraces)
                    {
                        // First image replace to tag <image, the rest of the images delete the tag
                        if (index++ == 0)
                            prompt = prompt.Replace(path, "<image>");
                        else
                            prompt = prompt.Replace(path, "");
                    }

                  
                    Console.ForegroundColor = ConsoleColor.Yellow;
                    Console.WriteLine($"Here are the images, that are sent to the chat model in addition to your message.");
                    Console.WriteLine();

                    foreach (var consoleImage in imageBytes?.Select(bytes => new CanvasImage(bytes)))
                    {
                        consoleImage.MaxWidth = 50;
                        AnsiConsole.Write(consoleImage);
                    }

                    Console.WriteLine();
                    Console.ForegroundColor = ConsoleColor.Yellow;
                    Console.WriteLine($"The images were scaled down for the console only, the model gets full versions.");
                    Console.WriteLine($"Write /exit or press Ctrl+c to return to main menu.");
                    Console.WriteLine();


                    // Initilize Images in executor
                    //
                    ex.ImagePaths = imagePaths.ToList();
                }

                Console.ForegroundColor = Color.White;
                await foreach (var text in ex.InferAsync(prompt, inferenceParams))
                {
                    Console.Write(text);
                }
                Console.Write(" ");
                Console.ForegroundColor = ConsoleColor.Green;
                prompt = Console.ReadLine();
                Console.WriteLine();
                
                // let the user finish with exit
                //
                if (prompt.Equals("/exit", StringComparison.OrdinalIgnoreCase))
                    break;

            }
            while(true);
        }
    }
}