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<a href="https://utkarshsinha.com" target="_blank">Utkarsh Sinha</a><sup>2</sup>,</span>
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<a href="https://jonbarron.info" target="_blank">Jonathan T. Barron</a><sup>2</sup>,
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<span class="author-block">
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<a href="http://sofienbouaziz.com" target="_blank">Sofien Bouaziz</a><sup>2</sup>,
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<span class="author-block">
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<a href="https://www.danbgoldman.com" target="_blank">Dan B Goldman</a><sup>2</sup>,
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<span class="author-block">
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<a href="https://homes.cs.washington.edu/~seitz/" target="_blank">Steven M. Seitz</a><sup>1,2</sup>,
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</span>
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<span class="author-block">
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<a href="http://www.ricardomartinbrualla.com" target="_blank">Ricardo Martin-Brualla</a><sup>2</sup>
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<div class="is-size-5 publication-authors">
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<span class="author-block"><sup>2</sup>Google Research</span>
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<span>Code</span>
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<span>Data</span>
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<span class="dnerf">Nerfies</span> turns selfie videos from your phone into
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free-viewpoint
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portraits.
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deforming scene using photos/videos captured casually from mobile phones.
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<
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(
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additional continuous volumetric deformation field that warps each observed point into a
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canonical 5D NeRF.
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We observe that these NeRF-like deformation fields are prone to local minima, and
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propose a coarse-to-fine optimization method for coordinate-based models that allows for
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more robust optimization.
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By adapting principles from geometry processing and physical simulation to NeRF-like
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models, we propose an elastic regularization of the deformation field that further
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improves robustness.
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<p>
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photos/videos into deformable NeRF
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models that allow for photorealistic renderings of the subject from arbitrary
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viewpoints, which we dub <i>"nerfies"</i>. We evaluate our method by collecting data
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using a
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rig with two mobile phones that take time-synchronized photos, yielding train/validation
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images of the same pose at different viewpoints. We show that our method faithfully
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reconstructs non-rigidly deforming scenes and reproduces unseen views with high
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fidelity.
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<h2 class="title is-3">Matting</h2>
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As a byproduct of our method, we can also solve the matting problem by ignoring
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samples that fall outside of a bounding box during rendering.
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frames. Use the slider here to linearly interpolate between the left frame and the right
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viewpoint such as a stabilized camera by playing back the training deformations.
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<h2 class="title is-3">Related Links</h2>
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<a href="https://arxiv.org/abs/2104.09125" target="_blank">Progressive Encoding for Neural Optimization</a> introduces an idea similar to our windowed position encoding for coarse-to-fine optimization.
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</p>
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<p>
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<a href="https://www.albertpumarola.com/research/D-NeRF/index.html" target="_blank">D-NeRF</a> and <a href="https://gvv.mpi-inf.mpg.de/projects/nonrigid_nerf/" target="_blank">NR-NeRF</a>
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both use deformation fields to model non-rigid scenes.
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</p>
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<p>
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Some works model videos with a NeRF by directly modulating the density, such as <a href="https://video-nerf.github.io/" target="_blank">Video-NeRF</a>, <a href="https://www.cs.cornell.edu/~zl548/NSFF/" target="_blank">NSFF</a>, and <a href="https://neural-3d-video.github.io/" target="_blank">DyNeRF</a>
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</p>
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<p>
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There are probably many more by the time you are reading this. Check out <a href="https://dellaert.github.io/NeRF/" target="_blank">Frank Dellart's survey on recent NeRF papers</a>, and <a href="https://github.com/yenchenlin/awesome-NeRF" target="_blank">Yen-Chen Lin's curated list of NeRF papers</a>.
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<section class="section" id="BibTeX">
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<div class="container is-max-desktop content">
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<h2 class="title">BibTeX</h2>
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<pre><code>@article{park2021nerfies,
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author = {Park, Keunhong and Sinha, Utkarsh and Barron, Jonathan T. and Bouaziz, Sofien and Goldman, Dan B and Seitz, Steven M. and Martin-Brualla, Ricardo},
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title = {Nerfies: Deformable Neural Radiance Fields},
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journal = {ICCV},
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year = {2021},
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}</code></pre>
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<a class="icon-link" href="https://github.com/keunhong" target="_blank" class="external-link" disabled>
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<i class="fab fa-github"></i>
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Commons Attribution-ShareAlike 4.0 International License</a>.
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This
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<meta name="description"
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content="MPCA is a novel, bio-inspired AI framework that moves beyond traditional machine learning models.">
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<meta name="keywords" content="MPCA, MycoPhysarum, Cognitive Architecture, Bio-inspired AI, Slime Mold, Mycelium, Graph AI, Efficient AI">
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<title>MycoPhysarum Cognitive Architecture (MPCA)</title>
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rel="stylesheet">
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<h1 class="title is-1 publication-title">MycoPhysarum Cognitive Architecture (MPCA)</h1>
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A Novel, Bio-Inspired AI Framework
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<span class="author-block">Inspired by the decentralized intelligence of slime molds and mycorrhizal networks.</span>
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<!-- Code Link. -->
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<span class="link-block">
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<a href="https://github.com/mlabonne/myco-physarum" target="_blank"
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class="external-link button is-normal is-rounded is-dark">
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<span class="icon">
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<span>Code</span>
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<div class="container is-max-desktop">
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<!-- Replaced video with a conceptual diagram -->
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<img src="https://huggingface.co/mlabonne/myco-physarum/resolve/main/mpca.png" alt="MPCA Architecture Diagram" style="width: 100%; max-width: 800px; margin: auto; display: block; border-radius: 10px;">
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<h2 class="subtitle has-text-centered" style="margin-top: 2rem;">
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MPCA represents knowledge not as static data, but as a dynamic, living graph that evolves through interaction and self-reflection.
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</h2>
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<div class="content" style="padding: 2rem;">
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<h3 class="title is-4">Mycelium</h3>
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<p>The heart of the system. A <code>networkx</code> directed graph where nodes are concepts and edges represent the relationships between them. The strength of these connections is dynamic, changing based on usage and learning.</p>
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</div>
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<h3 class="title is-4">Builder</h3>
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<p>The architect of the Mycelium. The Builder ingests raw text, uses <code>spaCy</code>'s dependency parser to understand grammatical structure, and translates it into a rich graph of nodes and relationships.</p>
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<h3 class="title is-4">Solver</h3>
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<p>The "consciousness" of MPCA. It traverses the Mycelium to find relevant pathways to answer queries. Implements Hebbian learning to reinforce successful paths and "dreaming" to form new speculative connections.</p>
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<h3 class="title is-4">Node</h3>
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<p>The fundamental unit of knowledge. Each node represents a word and has a <code>type</code> (concept, action, property) and a <code>strength</code>, indicating its importance in the network.</p>
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<h3 class="title is-4">Spore</h3>
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<p>A highly efficient persistence mechanism. A "spore" is a serialized (<code>pickle</code>) and compressed snapshot of the Mycelium, allowing the system's learned state to be saved and loaded from a tiny file (~9 MB).</p>
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<!-- Abstract -->
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<h2 class="title is-3">Core Philosophy</h2>
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<p>
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The core of MPCA is the "Cognitive Mycelium," a graph-based knowledge structure. Unlike rigid, pre-trained models, the Mycelium is built from the ground up to understand the grammatical and conceptual relationships in language. It learns, forgets, and even "dreams" to form new connections, creating a resilient and emergent form of intelligence with a fraction of the computational overhead of conventional architectures.
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</p>
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<h2 class="title is-3" style="margin-top: 2rem;">Radical Efficiency: The Spore Advantage</h2>
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<p>
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A key breakthrough of the MPCA is its incredible efficiency. A fully-formed Cognitive Mycelium, built from a large dataset (~100k entries, >2.9M sentences), can be compressed into a <code>spore</code> file of only <strong>~9 MB</strong>. This stands in stark contrast to conventional AI models like Transformers (GPT-2 is ~500 MB; modern models are many gigabytes).
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</p>
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<p>
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This efficiency is a direct result of the architecture's design. Instead of storing billions of statistical weights to predict tokens, the Mycelium stores a compressed graph of concepts and their relationships. It captures knowledge, not just statistical patterns, leading to a powerful, lightweight, and truly novel form of intelligence.
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<!-- Paper video. -->
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<h2 class="title is-3">How to Run</h2>
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<div class="content has-text-justified">
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<p><strong>1. Install Dependencies:</strong></p>
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<pre><code>pip install -r requirements.txt
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python -m spacy download en_core_web_sm</code></pre>
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<p><strong>2. Build a New Mycelium:</strong></p>
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<p>To create a new knowledge graph from a dataset, run the main script with the <code>--build</code> flag. The default dataset is <code>mlabonne/FineTome-100k</code>.</p>
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<pre><code>python main.py --build --spore-file mycelium_new.spore --limit 1000</code></pre>
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<p><strong>3. Interact with an Existing Mycelium:</strong></p>
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<p>To chat with a pre-built Mycelium, use the <code>--interactive</code> flag.</p>
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<pre><code>python main.py --interactive --spore-file mycelium.spore</code></pre>
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<div class="container is-max-desktop">
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<!-- Lifecycle -->
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<h2 class="title is-3">The MPCA Lifecycle</h2>
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<ol>
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<li><strong>Genesis (Building):</strong> The <code>Builder</code> creates a Mycelium from a data source, performing grammatical parsing to construct a graph of nodes and relationships, which is then saved as a <code>.spore</code> file.</li>
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<li><strong>Awakening (Loading):</strong> The system loads a <code>.spore</code> file into memory, awakening the Cognitive Mycelium.</li>
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<li><strong>Interaction (Solving):</strong> A user asks a question. The <code>Solver</code> takes the core concepts and finds a thought-path through the Mycelium to construct an answer.</li>
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<li><strong>Evolution (Learning):</strong> Successful thought-paths are reinforced via Hebbian learning, strengthening the system's knowledge.</li>
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<li><strong>Introspection (Dreaming):</strong> During downtime, the system can dream to form new, speculative connections, expanding its creative potential.</li>
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</ol>
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<!--/ Lifecycle. -->
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<!-- The Path Forward -->
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<h2 class="title is-3">The Path Forward: Extending MPCA to a Multi-Modal World</h2>
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<div class="content has-text-justified">
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<p>
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The current architecture is a powerful foundation for understanding language. Its true potential lies in extending this conceptual graph to understand and generate other forms of data. The core principle is that MPCA acts as a <strong>central orchestrator</strong>, connecting its abstract conceptual understanding to specialized external models for processing and generation.
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</p>
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<h3 class="title is-4">Image Understanding and Generation</h3>
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<div class="content has-text-justified">
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<p><strong>Understanding:</strong> A Vision-Language Model (VLM) like CLIP analyzes an image and outputs concept tags (e.g., "a red car on a street"). The <code>Builder</code> integrates these concepts into the Mycelium, linking an <code>ImageNode</code> to existing nodes like <code>Node('car')</code> and <code>Node('red')</code>. The graph learns <em>what's in the image</em>, not the pixels themselves.</p>
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<p><strong>Generation:</strong> The <code>Solver</code> assembles a conceptual blueprint (e.g., <code>Node('boat') → Node('blue') → Node('ocean')</code>). This blueprint is passed as a highly-structured prompt to an external image generation model (like a VAE or Diffusion model) to render the final image.</p>
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</div>
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<h3 class="title is-4">Audio & Video</h3>
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<p>
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A similar approach applies to audio and video. For audio, speech-to-text models provide text for integration, while event detection models can identify non-speech sounds ("dog barking"). For video, an analysis model tracks objects and actions over time, which the <code>Builder</code> represents as a complex, time-stamped sub-graph.
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<h3 class="title is-4">Taking Action (Agency)</h3>
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Actions are a native <code>Node</code> type in MPCA. To enable agency, these action nodes can be linked to real-world API calls or robotic functions. When the <code>Solver</code>'s thought-path traverses an <code>ActionNode</code> linked to an external function (e.g., <code>Node('turn_on_light')</code>), it triggers that function. This turns the MPCA from a passive knowledge base into an active agent that can perceive, reason about, and act upon its environment.
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<!--/ The Path Forward -->
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<a class="icon-link" href="https://github.com/mlabonne/myco-physarum" target="_blank" class="external-link" disabled>
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Commons Attribution-ShareAlike 4.0 International License</a>.
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This page template was borrowed from the <a target="_blank" href="https://github.com/nerfies/nerfies.github.io">Nerfies</a> project website.
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