feat: ✨ Use Batch Api for embeddings (#14)

#13

readme.md

@@ -1,12 +1,14 @@
 # AI Assist
 
-> AI assistant for coding, chat, code explanation, review with supporting local and online language models.
+> `Context Aware` AI assistant for coding, chat, code explanation, review with supporting local and online language models.
 
 `AIAssist` is compatible with [OpenAI](https://platform.openai.com/docs/api-reference/introduction) and [Azure AI Services](https://azure.microsoft.com/en-us/products/ai-services) through apis or [Ollama models](https://ollama.com/search) through [ollama engine](https://ollama.com/) locally.
 
 > [!TIP]
 > You can use ollama and its models that are more compatible with code like [deepseek-v2.5](https://ollama.com/library/deepseek-v2.5) or [qwen2.5-coder](https://ollama.com/library/qwen2.5-coder) locally. To use local models, you will need to run [Ollama](https://github.com/ollama/ollama) process first. For running ollama you can use [ollama docker](https://ollama.com/blog/ollama-is-now-available-as-an-official-docker-image) container.
 
+Note: `vscode` and `jetbrains` plugins are in the plan and I will add them soon.
+
 ## Features
 
 -   ✅ `Context Aware` ai code assistant through [ai embeddings](src/AIAssistant/Services/CodeAssistStrategies/EmbeddingCodeAssist.cs) which is based on Retrieval Augmented Generation (RAG) or [tree-sitter application summarization](src/AIAssistant/Services/CodeAssistStrategies/TreeSitterCodeAssistSummary.cs) to summarize application context and understanding by AI.

src/AIAssistant/Commands/CodeAssistCommand.cs

@@ -63,17 +63,17 @@ public sealed class Settings : CommandSettings
         [Description("[grey] the type of code assist. it can be `embedding` or `summary`.[/].")]
         public CodeAssistType? CodeAssistType { get; set; }
 
-        [CommandOption("--threshold <threshold")]
+        [CommandOption("--threshold <threshold>")]
         [Description("[grey] the threshold is a value for using in the `embedding`.[/].")]
         public decimal? Threshold { get; set; }
 
-        [CommandOption("--temperature <temperature")]
+        [CommandOption("--temperature <temperature>")]
         [Description(
             "[grey] the temperature is a value for controlling creativity or randomness on the llm response.[/]."
         )]
         public decimal? Temperature { get; set; }
 
-        [CommandOption("--chat-api-key <key>")]
+        [CommandOption("--chat-api-key <chat-api-key>")]
         [Description("[grey] the chat model api key.[/].")]
         public string? ChatModelApiKey { get; set; }
 
@@ -159,7 +159,7 @@ await AnsiConsole
 
             console.Write(new Rule());
 
-            userInput = "can you remove all comments from Add.cs file?";
+            //userInput = "can you remove all comments from Add.cs file?";
             _running = await internalCommandProcessor.ProcessCommand(userInput, scope);
         }
 

src/AIAssistant/Contracts/IEmbeddingService.cs

@@ -1,3 +1,4 @@
+using System.Collections;
 using AIAssistant.Chat.Models;
 using AIAssistant.Data;
 using AIAssistant.Dtos;
@@ -9,7 +10,7 @@ namespace AIAssistant.Contracts;
 public interface IEmbeddingService
 {
     Task<AddEmbeddingsForFilesResult> AddOrUpdateEmbeddingsForFiles(
-        IEnumerable<CodeFileMap> codeFilesMap,
+        IList<CodeFileMap> codeFilesMap,
         ChatSession chatSession
     );
     Task<GetRelatedEmbeddingsResult> GetRelatedEmbeddings(string userQuery, ChatSession chatSession);

src/AIAssistant/Contracts/ILLMClientManager.cs

@@ -14,7 +14,7 @@ public interface ILLMClientManager
         CancellationToken cancellationToken = default
     );
     Task<GetEmbeddingResult> GetEmbeddingAsync(
-        string input,
+        IList<string> inputs,
         string? path,
         CancellationToken cancellationToken = default
     );

src/AIAssistant/Dtos/GetBatchEmbeddingResult.cs

@@ -0,0 +1,8 @@
+namespace AIAssistant.Dtos;
+
+public class GetBatchEmbeddingResult(IList<IList<double>> embeddings, int totalTokensCount, decimal totalCost)
+{
+    public IList<IList<double>> Embeddings { get; } = embeddings;
+    public int TotalTokensCount { get; } = totalTokensCount;
+    public decimal TotalCost { get; } = totalCost;
+}

src/AIAssistant/Dtos/GetEmbeddingResult.cs

@@ -1,3 +1,7 @@
 namespace AIAssistant.Dtos;
 
-public record GetEmbeddingResult(IList<double> Embeddings, int TotalTokensCount, decimal TotalCost);
+public record GetEmbeddingResult(
+    IList<IList<double>> Embeddings, // Multiple embeddings for batch
+    int TotalTokensCount,
+    decimal TotalCost
+);

src/AIAssistant/Models/FileBatch.cs

@@ -0,0 +1,18 @@
+namespace AIAssistant.Models;
+
+/// <summary>
+/// Represents a batch of files and their chunks to be processed in a single embedding request.
+/// </summary>
+public class FileBatch
+{
+    public IList<FileChunkGroup> Files { get; set; } = new List<FileChunkGroup>();
+    public int TotalTokens { get; set; }
+
+    /// <summary>
+    /// Combines all chunked inputs for this batch into a single list for API calls.
+    /// </summary>
+    public IList<string> GetBatchInputs()
+    {
+        return Files.SelectMany(file => file.Chunks).ToList();
+    }
+}

src/AIAssistant/Models/FileChunkGroup.cs

@@ -0,0 +1,14 @@
+using TreeSitter.Bindings.CustomTypes.TreeParser;
+
+namespace AIAssistant.Models;
+
+/// <summary>
+/// Represents a file and its associated chunks for embedding.
+/// </summary>
+public class FileChunkGroup(CodeFileMap file, List<string> chunks)
+{
+    public CodeFileMap File { get; } = file;
+    public IList<string> Chunks { get; } = chunks;
+
+    public string Input => string.Join("\n", Chunks);
+}

src/AIAssistant/Services/EmbeddingService.cs

@@ -4,49 +4,86 @@
 using AIAssistant.Dtos;
 using AIAssistant.Models;
 using BuildingBlocks.LLM;
-using BuildingBlocks.Utils;
 using TreeSitter.Bindings.CustomTypes.TreeParser;
 
 namespace AIAssistant.Services;
 
 public class EmbeddingService(
     ILLMClientManager llmClientManager,
     ICodeEmbeddingsRepository codeEmbeddingsRepository,
-    IPromptManager promptManager
+    IPromptManager promptManager,
+    ITokenizer tokenizer
 ) : IEmbeddingService
 {
     public async Task<AddEmbeddingsForFilesResult> AddOrUpdateEmbeddingsForFiles(
-        IEnumerable<CodeFileMap> codeFilesMap,
+        IList<CodeFileMap> codeFilesMap,
         ChatSession chatSession
     )
     {
         int totalTokens = 0;
         decimal totalCost = 0;
 
-        IList<CodeEmbedding> codeEmbeddings = new List<CodeEmbedding>();
+        var fileEmbeddingsMap = new Dictionary<string, List<IList<double>>>();
+
+        // Group files and manage batching using the updated tokenizer logic
+        var fileBatches = await BatchFilesByTokenLimitAsync(codeFilesMap, maxBatchTokens: 8192);
+
+        foreach (var batch in fileBatches)
+        {
+            var batchInputs = batch.GetBatchInputs();
+            var embeddingResult = await llmClientManager.GetEmbeddingAsync(batchInputs, null);
+
+            int resultIndex = 0;
+            foreach (var fileChunkGroup in batch.Files)
+            {
+                // Extract embeddings for the current file's chunks
+                var fileEmbeddings = embeddingResult
+                    .Embeddings.Skip(resultIndex)
+                    .Take(fileChunkGroup.Chunks.Count)
+                    .ToList();
+
+                resultIndex += fileChunkGroup.Chunks.Count;
+
+                // Group embeddings by file path
+                if (!fileEmbeddingsMap.TryGetValue(fileChunkGroup.File.RelativePath, out List<IList<double>>? value))
+                {
+                    value = new List<IList<double>>();
+                    fileEmbeddingsMap[fileChunkGroup.File.RelativePath] = value;
+                }
+
+                value.AddRange(fileEmbeddings);
+            }
+
+            totalTokens += embeddingResult.TotalTokensCount;
+            totalCost += embeddingResult.TotalCost;
+        }
 
-        foreach (var codeFileMap in codeFilesMap)
+        // Merge and create final embeddings for each file
+        var codeEmbeddings = new List<CodeEmbedding>();
+        foreach (var entry in fileEmbeddingsMap)
         {
-            var input = promptManager.GetEmbeddingInputString(codeFileMap.TreeSitterFullCode);
-            var embeddingResult = await llmClientManager.GetEmbeddingAsync(input, codeFileMap.RelativePath);
+            var filePath = entry.Key;
+            var embeddings = entry.Value;
+
+            // Merge embeddings for the file
+            var mergedEmbedding = MergeEmbeddings(embeddings);
+
+            // Retrieve the original file details from codeFilesMap
+            var fileDetails = codeFilesMap.First(file => file.RelativePath == filePath);
 
             codeEmbeddings.Add(
                 new CodeEmbedding
                 {
-                    RelativeFilePath = codeFileMap.RelativePath,
-                    TreeSitterFullCode = codeFileMap.TreeSitterFullCode,
-                    TreeOriginalCode = codeFileMap.TreeOriginalCode,
-                    Code = codeFileMap.OriginalCode,
+                    RelativeFilePath = fileDetails.RelativePath,
+                    TreeSitterFullCode = fileDetails.TreeSitterFullCode,
+                    TreeOriginalCode = fileDetails.TreeOriginalCode,
+                    Code = fileDetails.OriginalCode,
                     SessionId = chatSession.SessionId,
-                    Embeddings = embeddingResult.Embeddings,
+                    Embeddings = mergedEmbedding,
                 }
             );
-
-            totalTokens += embeddingResult.TotalTokensCount;
-            totalCost += embeddingResult.TotalCost;
         }
 
-        // we can replace it with an embedded database like `chromadb`, it can give us n of most similarity items
         await codeEmbeddingsRepository.AddOrUpdateCodeEmbeddings(codeEmbeddings);
 
         return new AddEmbeddingsForFilesResult(totalTokens, totalCost);
@@ -59,7 +96,7 @@ public async Task<GetRelatedEmbeddingsResult> GetRelatedEmbeddings(string userQu
 
         // Find relevant code based on the user query
         var relevantCodes = codeEmbeddingsRepository.Query(
-            embeddingsResult.Embeddings,
+            embeddingsResult.Embeddings.First(),
             chatSession.SessionId,
             llmClientManager.EmbeddingThreshold
         );
@@ -82,6 +119,147 @@ public IEnumerable<CodeEmbedding> QueryByFilter(
 
     public async Task<GetEmbeddingResult> GenerateEmbeddingForUserInput(string userInput)
     {
-        return await llmClientManager.GetEmbeddingAsync(userInput, null);
+        return await llmClientManager.GetEmbeddingAsync(new List<string> { userInput }, null);
+    }
+
+    private async Task<List<FileBatch>> BatchFilesByTokenLimitAsync(
+        IEnumerable<CodeFileMap> codeFilesMap,
+        int maxBatchTokens
+    )
+    {
+        var fileBatches = new List<FileBatch>();
+        var currentBatch = new FileBatch();
+
+        foreach (var file in codeFilesMap)
+        {
+            // Convert the full code to an input string and split into chunks
+            var input = promptManager.GetEmbeddingInputString(file.TreeSitterFullCode);
+            var chunks = await SplitTextIntoChunksAsync(input, maxTokens: 8192);
+
+            var tokenCountTasks = chunks.Select(chunk => tokenizer.GetTokenCount(chunk));
+            var tokenCounts = await Task.WhenAll(tokenCountTasks);
+
+            // Pair chunks with their token counts
+            var chunkWithTokens = chunks.Zip(
+                tokenCounts,
+                (chunk, tokenCount) => new { Chunk = chunk, TokenCount = tokenCount }
+            );
+
+            foreach (var chunkGroup in chunkWithTokens)
+            {
+                // If adding this chunk would exceed the batch token limit
+                if (currentBatch.TotalTokens + chunkGroup.TokenCount > maxBatchTokens && currentBatch.Files.Count > 0)
+                {
+                    // Finalize the current batch and start a new one
+                    fileBatches.Add(currentBatch);
+                    currentBatch = new FileBatch();
+                }
+
+                // Add this chunk to the current batch
+                if (currentBatch.Files.All(f => f.File != file))
+                {
+                    // If this is the first chunk of this file in the current batch, add a new FileChunkGroup
+                    currentBatch.Files.Add(new FileChunkGroup(file, new List<string> { chunkGroup.Chunk }));
+                }
+                else
+                {
+                    // Add the chunk to the existing FileChunkGroup for this file
+                    var fileGroup = currentBatch.Files.First(f => f.File == file);
+                    fileGroup.Chunks.Add(chunkGroup.Chunk);
+                }
+
+                currentBatch.TotalTokens += chunkGroup.TokenCount;
+            }
+        }
+
+        // Add the last batch if it has content
+        if (currentBatch.Files.Count > 0)
+        {
+            fileBatches.Add(currentBatch);
+        }
+
+        return fileBatches;
+    }
+
+    private async Task<List<string>> SplitTextIntoChunksAsync(string text, int maxTokens)
+    {
+        var words = text.Split(' ');
+        var chunks = new List<string>();
+        var currentChunk = new List<string>();
+
+        foreach (var word in words)
+        {
+            currentChunk.Add(word);
+
+            // Check token count only when the chunk exceeds a certain word threshold
+            if (currentChunk.Count % 50 == 0 || currentChunk.Count == words.Length)
+            {
+                var currentText = string.Join(" ", currentChunk);
+                var currentTokenCount = await tokenizer.GetTokenCount(currentText);
+
+                if (currentTokenCount > maxTokens)
+                {
+                    // Ensure the chunk size is within limits
+                    while (currentTokenCount > maxTokens && currentChunk.Count > 1)
+                    {
+                        currentChunk.RemoveAt(currentChunk.Count - 1);
+                        currentText = string.Join(" ", currentChunk);
+                        currentTokenCount = await tokenizer.GetTokenCount(currentText);
+                    }
+
+                    // Add the finalized chunk only if it fits the token limit
+                    if (currentTokenCount <= maxTokens)
+                    {
+                        chunks.Add(currentText);
+                    }
+
+                    // Start a new chunk with the current word
+                    currentChunk.Clear();
+                    currentChunk.Add(word);
+                }
+            }
+        }
+
+        // Add the final chunk if it has content and is within the token limit
+        if (currentChunk.Count > 0)
+        {
+            var finalText = string.Join(" ", currentChunk);
+            var finalTokenCount = await tokenizer.GetTokenCount(finalText);
+
+            if (finalTokenCount <= maxTokens)
+            {
+                chunks.Add(finalText);
+            }
+        }
+
+        return chunks;
+    }
+
+    private IList<double> MergeEmbeddings(IList<IList<double>> embeddings)
+    {
+        if (embeddings == null || embeddings.Count == 0)
+            throw new ArgumentException("The embeddings list cannot be null or empty.");
+
+        int dimension = embeddings.First().Count;
+        var mergedEmbedding = new double[dimension];
+
+        foreach (var embedding in embeddings)
+        {
+            if (embedding.Count != dimension)
+                throw new InvalidOperationException("All embeddings must have the same dimensionality.");
+
+            for (int i = 0; i < dimension; i++)
+            {
+                mergedEmbedding[i] += embedding[i];
+            }
+        }
+
+        // Average the embeddings to unify them into one
+        for (int i = 0; i < dimension; i++)
+        {
+            mergedEmbedding[i] /= embeddings.Count;
+        }
+
+        return mergedEmbedding;
     }
 }