Esempi

Questa pagina fornisce esempi completi e pronti all'uso che dimostrano flussi di lavoro comuni con il plugin Runtime Local LLM. Ogni esempio include implementazioni sia in Blueprint che in C++.

Assicurati di aver letto prima Come usare il plugin per una panoramica dell'API.

Chat semplice

Crea un'istanza LLM, carica un modello per nome, invia un messaggio e visualizza la risposta token per token.

Blueprint

Nodi copiabili.

C++

    // Assuming "this" is an AActor with a UPROPERTY() URuntimeLocalLLM* LLM member
    // Note: Callback functions (OnModelReady, OnToken, OnComplete, OnLLMError) must be marked as UFUNCTION() in your header file

    void AMyActor::BeginPlay()
    {
        Super::BeginPlay();

        LLM = URuntimeLocalLLM::CreateRuntimeLocalLLM();

        LLM->OnModelLoadedNative.AddUObject(this, &AMyActor::OnModelReady);
        LLM->OnTokenGeneratedNative.AddUObject(this, &AMyActor::OnToken);
        LLM->OnGenerationCompleteNative.AddUObject(this, &AMyActor::OnComplete);
        LLM->OnErrorNative.AddUObject(this, &AMyActor::OnLLMError);

        FLLMInferenceParams Params;
        Params.MaxTokens = 512;
        Params.Temperature = 0.7f;
        Params.SystemPrompt = TEXT("You are a helpful assistant.");

        TArray<FLLMModelMetadata> DownloadedModels = URuntimeLLMLibrary::GetAllDownloadedModelMetadata();

        // For demonstration purposes, we simply pick the first available model, swap this with your own selection logic as needed
        if (DownloadedModels.Num() > 0)
        {
            const FLLMModelMetadata& Model = DownloadedModels[0]; // Select the first available model
            FString ModelFileName = URuntimeLLMLibrary::GetModelFileName(Model);
            LLM->LoadModelByName(FName(*ModelFileName), Params);
        }
    }

    void AMyActor::OnModelReady(const FLLMModelMetadata& Metadata)
    {
        UE_LOG(LogTemp, Log, TEXT("Model ready: %s"), *Metadata.ModelDisplayName);
        LLM->SendMessage(TEXT("Hello! Tell me a fun fact."));
    }

    void AMyActor::OnToken(const FString& Token)
    {
        // Handle each token as it's generated (e.g. append to a string, update UI, stream to audio, etc)
        UE_LOG(LogTemp, Log, TEXT("%s"), *Token);
    }

    void AMyActor::OnComplete(const FString& FullResponse, float Duration, int32 Tokens, float TPS)
    {
        UE_LOG(LogTemp, Log, TEXT("Done: %d tokens in %.1fs (%.1f tok/s)"), Tokens, Duration, TPS);
    }

    void AMyActor::OnLLMError(ELLMErrorCode ErrorCode)
    {
        FText Desc = URuntimeLLMUtils::GetLLMErrorDescription(ErrorCode);
        UE_LOG(LogTemp, Error, TEXT("LLM Error: %s"), *Desc.ToString());
    }

Scarica, Carica e Conversa

Scarica un modello da un URL in fase di esecuzione, caricalo e inizia una conversazione. Il download viene saltato se il modello esiste già su disco.

Blueprint

Nodi copiabili.

C++

    // Assuming "this" is an AActor with a UPROPERTY() URuntimeLocalLLM* LLM member
    // Note: Callback functions (OnProgress, OnModelReady, OnToken, OnComplete, OnLLMError) must be marked as UFUNCTION() in your header file

    void AMyActor::BeginPlay()
    {
        Super::BeginPlay();

        LLM = URuntimeLocalLLM::CreateRuntimeLocalLLM();

        LLM->OnDownloadProgressNative.AddUObject(this, &AMyActor::OnProgress);
        LLM->OnModelLoadedNative.AddUObject(this, &AMyActor::OnModelReady);
        LLM->OnTokenGeneratedNative.AddUObject(this, &AMyActor::OnToken);
        LLM->OnGenerationCompleteNative.AddUObject(this, &AMyActor::OnComplete);
        LLM->OnErrorNative.AddUObject(this, &AMyActor::OnLLMError);

        FLLMInferenceParams Params;
        Params.MaxTokens = 256;
        LLM->LoadModelFromURLSimple(
            TEXT("https://huggingface.co/bartowski/Llama-3.2-1B-Instruct-GGUF/resolve/main/Llama-3.2-1B-Instruct-Q4_K_M.gguf"), Params);
    }

    void AMyActor::OnProgress(float Progress, int64 BytesReceived, int64 TotalBytes)
    {
        FString ProgressText = URuntimeLLMUtils::FormatDownloadProgress(BytesReceived, TotalBytes);
        UE_LOG(LogTemp, Log, TEXT("Downloading: %s"), *ProgressText);
    }

    void AMyActor::OnModelReady(const FLLMModelMetadata& Metadata)
    {
        LLM->SendMessage(TEXT("What is the capital of France?"));
    }

    void AMyActor::OnToken(const FString& Token)
    {
        // Handle each token as it's generated (e.g. append to a string, update UI, stream to audio, etc)
        UE_LOG(LogTemp, Log, TEXT("%s"), *Token);
    }

    void AMyActor::OnComplete(const FString& FullResponse, float Duration, int32 Tokens, float TPS)
    {
        UE_LOG(LogTemp, Log, TEXT("Done: %d tokens in %.1fs (%.1f tok/s)"), Tokens, Duration, TPS);
    }

    void AMyActor::OnLLMError(ELLMErrorCode ErrorCode)
    {
        FText Desc = URuntimeLLMUtils::GetLLMErrorDescription(ErrorCode);
        UE_LOG(LogTemp, Error, TEXT("LLM Error: %s"), *Desc.ToString());
    }

Pre-scaricamento dei Modelli

Scarica i modelli su disco senza caricarli, utile per una schermata delle impostazioni o un menu di caricamento in cui gli utenti scelgono i modelli da memorizzare in anticipo.

Blueprint

Nodi copiabili.

C++

    // Assuming "this" is an AActor with a UPROPERTY() URuntimeLocalLLM* LLM member
    // Note: Callback functions (OnProgress, OnDownloaded, OnLLMError) must be marked as UFUNCTION() in your header file

    void AMyActor::StartPredownload()
    {
        LLM = URuntimeLocalLLM::CreateRuntimeLocalLLM();

        LLM->OnDownloadProgressNative.AddUObject(this, &AMyActor::OnProgress);
        LLM->OnModelDownloadedNative.AddUObject(this, &AMyActor::OnDownloaded);
        LLM->OnErrorNative.AddUObject(this, &AMyActor::OnLLMError);

        LLM->DownloadModelFromURL(
            TEXT("https://huggingface.co/user/model/resolve/main/model-Q4_K_M.gguf"));
    }

    void AMyActor::OnProgress(float Progress, int64 BytesReceived, int64 TotalBytes)
    {
        FString ProgressText = URuntimeLLMUtils::FormatDownloadProgress(BytesReceived, TotalBytes);
        UE_LOG(LogTemp, Log, TEXT("Downloading: %s"), *ProgressText);
    }

    void AMyActor::OnDownloaded(const FString& FilePath, const FLLMModelMetadata& Metadata)
    {
        UE_LOG(LogTemp, Log, TEXT("Model saved to: %s"), *FilePath);
        // Model is now on disk - load it later with LoadModelByName or LoadModelFromFile
    }

    void AMyActor::OnLLMError(ELLMErrorCode ErrorCode)
    {
        FText Desc = URuntimeLLMUtils::GetLLMErrorDescription(ErrorCode);
        UE_LOG(LogTemp, Error, TEXT("LLM Error: %s"), *Desc.ToString());
    }

Dialogo NPC

Un sistema di dialogo NPC di base in cui il giocatore digita un messaggio e l'NPC risponde. Il contesto della conversazione persiste tra i messaggi, così l'NPC ricorda gli scambi precedenti.

Blueprint

Nodi copiabili.

C++

    // Assuming "this" is an AActor with a UPROPERTY() URuntimeLocalLLM* LLM member
    // Note: Callback functions (OnToken, OnComplete, OnLLMError) must be marked as UFUNCTION() in your header file
    
    void ANPCActor::BeginPlay()
    {
        Super::BeginPlay();

        LLM = URuntimeLocalLLM::CreateRuntimeLocalLLM();

        LLM->OnTokenGeneratedNative.AddUObject(this, &ANPCActor::OnToken);
        LLM->OnGenerationCompleteNative.AddUObject(this, &ANPCActor::OnComplete);
        LLM->OnErrorNative.AddUObject(this, &AMyActor::OnLLMError);

        FLLMInferenceParams Params;
        Params.MaxTokens = 150;
        Params.Temperature = 0.9f;
        Params.SystemPrompt = TEXT(
            "You are a grumpy blacksmith in a medieval village. "
            "Keep responses to 2-3 sentences. Stay in character.");

        // For demonstration purposes, we simply pick the first available model, swap this with your own selection logic as needed
        if (DownloadedModels.Num() > 0)
        {
            const FLLMModelMetadata& Model = DownloadedModels[0]; // Select the first available model
            FString ModelFileName = URuntimeLLMLibrary::GetModelFileName(Model);
            LLM->LoadModelByName(FName(*ModelFileName), Params);
        }
    }

    void ANPCActor::OnPlayerInteract(const FString& PlayerMessage)
    {
        if (LLM->IsModelLoaded() && !LLM->IsGenerating())
        {
            LLM->SendMessage(PlayerMessage);
        }
    }

    void ANPCActor::OnToken(const FString& Token)
    {
        // Stream token into dialogue widget
    }

    void ANPCActor::OnComplete(const FString& FullResponse, float Duration, int32 Tokens, float TPS)
    {
        // Re-enable player input
    }

    void ANPCActor::OnPlayerLeaves()
    {
        // Reset for next encounter
        LLM->ResetContext(true); // Keep system prompt
    }