Editor's note: This post is part of the AI Decoded series, which demystifies AI by making the technology more accessible, and showcases new hardware, software, tools and accelerations for RTX PC and workstation users.
At Gamescom this week, NVIDIA announced that NVIDIA ACE - a suite of technologies for bringing digital humans to life with generative AI - now includes the company's first on-device small language model (SLM), powered locally by RTX AI.
The model, called Nemotron-4 4B Instruct, provides better role-play, retrieval-augmented generation and function-calling capabilities, so game characters can more intuitively comprehend player instructions, respond to gamers, and perform more accurate and relevant actions.
Available as an NVIDIA NIM microservice for cloud and on-device deployment by game developers, the model is optimized for low memory usage, offering faster response times and providing developers a way to take advantage of over 100 million GeForce RTX-powered PCs and laptops and NVIDIA RTX-powered workstations.
The SLM Advantage An AI model's accuracy and performance depends on the size and quality of the dataset used for training. Large language models are trained on vast amounts of data, but are typically general-purpose and contain excess information for most uses.
SLMs, on the other hand, focus on specific use cases. So even with less data, they're capable of delivering more accurate responses, more quickly - critical elements for conversing naturally with digital humans.
Nemotron-4 4B was first distilled from the larger Nemotron-4 15B LLM. This process requires the smaller model, called a student, to mimic the outputs of the larger model, appropriately called a teacher. During this process, noncritical outputs of the student model are pruned or removed to reduce the parameter size of the model. Then, the SLM is quantized, which reduces the precision of the model's weights.
With fewer parameters and less precision, Nemotron-4 4B has a lower memory footprint and faster time to first token - how quickly a response begins - than the larger Nemotron-4 LLM while still maintaining a high level of accuracy due to distillation. Its smaller memory footprint also means games and apps that integrate the NIM microservice can run locally on more of the GeForce RTX AI PCs and laptops and NVIDIA RTX AI workstations that consumers own today.
This new, optimized SLM is also purpose-built with instruction tuning, a technique for fine-tuning models on instructional prompts to better perform specific tasks. This can be seen in Mecha BREAK, a video game in which players can converse with a mechanic game character and instruct it to switch and customize mechs.
ACEs Up ACE NIM microservices allow developers to deploy state-of-the-art generative AI models through the cloud or on RTX AI PCs and workstations to bring AI to their games and applications. With ACE NIM microservices, non-playable characters (NPCs) can dynamically interact and converse with players in the game in real time.
ACE consists of key AI models for speech-to-text, language, text-to-speech and facial animation. It's also modular, allowing developers to choose the NIM microservice needed for each element in their particular process.
NVIDIA Riva automatic speech recognition (ASR) processes a user's spoken language and uses AI to deliver a highly accurate transcription in real time. The technology builds fully customizable conversational AI pipelines using GPU-accelerated multilingual speech and translation microservices. Other supported ASRs include OpenAI's Whisper, a open-source neural net that approaches human-level robustness and accuracy on English speech recognition.
Once translated to digital text, the transcription goes into an LLM - such as Google's Gemma, Meta's Llama 3 or now NVIDIA Nemotron-4 4B - to start generating a response to the user's original voice input.
Next, another piece of Riva technology - text-to-speech - generates an audio response. ElevenLabs' proprietary AI speech and voice technology is also supported and has been demoed as part of ACE, as seen in the above demo.
Finally, NVIDIA Audio2Face (A2F) generates facial expressions that can be synced to dialogue in many languages. With the microservice, digital avatars can display dynamic, realistic emotions streamed live or baked in during post-processing.
The AI network automatically animates face, eyes, mouth, tongue and head motions to match the selected emotional range and level of intensity. And A2F can automatically infer emotion directly from an audio clip.
Finally, the full character or digital human is animated in a renderer, like Unreal Engine or the NVIDIA Omniverse platform.
AI That's NIMble In addition to its modular support for various NVIDIA-powered and third-party AI models, ACE allows developers to run inference for each model in the cloud or locally on RTX AI PCs and workstations.
The NVIDIA AI Inference Manager software development kit allows for hybrid inference based on various needs such as experience, workload and costs. It streamlines AI model deployment and integration for PC application developers by preconfiguring the PC with the necessary AI models, engines and dependencies. Apps and games can then orchestrate inference seamlessly across a PC or workstation to the cloud.
ACE NIM microservices run locally on RTX AI PCs and workstations, as well as in the cloud. Current microservices running locally include Audio2Face, in the Covert Protocol tech demo, and the new Nemotron-4 4B Instruct and Whisper ASR in Mecha BREAK.
To Infinity and Beyond Digital humans go far beyond NPCs in games. At last month's SIGGRAPH conference, NVIDIA previewed James, an interactive digital human that can connect with people using emotions, humor and more. James is based on
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Editor's note: This post is part of the AI Decoded series, which demystifies AI by making the technology more accessible, and showcases new hardware, software, tools and accelerations for RTX PC and workstation users.
