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<sup style="font-size: 18px">learning@home</sup> |
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<span id="title_text">hivemind</span> |
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<sup style="font-size: 18px">v0.10 beta </sup> |
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<p style="font-size: 18px; margin-top:0px; margin-bottom:0px;">train vast neural networks together</p> |
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</h1> |
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A library to train large neural networks across the internet. Imagine training one huge transformer on thousands of computers from universities, companies, and volunteers. |
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<br><br> |
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Why should you care?</p> |
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Larger neural networks are winning: |
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<ul style="text-align: left; list-style-position: inside; margin-top: 12px; margin-left: -32px;"> |
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pretrained transformers <a href=https://w4ngatang.github.io/static/papers/superglue.pdf target="_blank" rel="noopener noreferrer">dominate</a> most NLP tasks;</li> |
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<li style="margin-top: 12px;"> |
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bigger CNNs <a href="https://arxiv.org/abs/1912.11370" target="_blank" rel="noopener noreferrer">perform better</a> at computer vision;</li> |
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<li style="margin-top: 12px;"> |
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GPT-3 has <a href="https://arxiv.org/abs/2005.14165" target="_blank" rel="noopener noreferrer">175B</a> parameters and <a target="_blank" rel="noopener noreferrer" href="https://arxiv.org/abs/2006.16668">the race continues</a></li> |
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</ul> |
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With transfer learning, these large models can harness nearly unlimited raw data to improve performance on both <a href=https://paperswithcode.com/task/language-modelling target="_blank" rel="noopener noreferrer">academic benchmarks</a> and solve <a href=https://medium.com/towards-artificial-intelligence/crazy-gpt-3-use-cases-232c22142044 target="_blank" rel="noopener noreferrer">new unexpected</a> tasks. |
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<center> |
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<span style="margin-top: 16px; font-style: italic; font-size: 14px;"> |
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Image credit: [1] <a href="https://arxiv.org/abs/2001.08361" target="_blank" rel="noopener noreferrer">Kaplan et al. (2020)</a>, [2, 3] <a href="https://arxiv.org/abs/1811.06965" target="_blank" rel="noopener noreferrer">Huang et al. (2018)</a> |
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<p class="faded text" style="width: 100%; max-width: 900px; margin-top:16px; text-align: left"> |
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That said, training large neural networks isn't cheap. The hardware used for the <a href="https://arxiv.org/abs/1909.08053" target="_blank" rel="noopener noreferrer">previous largest</a> language model costs over $25 million. A single training run for GPT-3 will set you back <a href="https://lambdalabs.com/blog/demystifying-gpt-3/" target="_blank" rel="noopener noreferrer">at least $4.6M</a> in cloud GPUs. As a result, researchers can't contribute to state-of-the-art deep learning models and practitioners can't build applications without <a href=https://blogs.microsoft.com/ai/openai-azure-supercomputer target="_blank" rel="noopener noreferrer">being supported</a> by a megacorporation. If we want the future of AI to be bright, it can't be private. |
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<br> |
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<p class="faded title" style="font-size:28px;"> |
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What is hivemind?</p> |
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<br> |
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<p class="faded text" style="margin-top:16px;"> |
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Hivemind is a library for decentralized training of large neural networks. In a nutshell, you want to train a neural network, but all you have is a bunch of enthusiasts with unreliable computers that communicate over the internet. Any peer may fail or leave at any time, but the training must go on. To meet this objective, hivemind models use a specialized layer type: the <b>D</b>ecentralized <b>M</b>ixture of <b>E</b>xperts (DMoE). Here's how it works:<br> |
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<div class="container"> |
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<video src="dmoe_demonstration.mp4" style="width:100%; max-width:880px; min-width:320px; margin-top:12px; float:center;" controls poster="poster.png"> |
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In a hivemind experiment, all peers: |
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<ul style="text-align: left; list-style-position: inside; margin-top: 16px; margin-left: -32px;"> |
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host one or more experts depending on their hardware;</li> |
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<li style="margin-top: 12px;"> |
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run asynchronous training, calling experts from other peers,</li> |
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<li style="margin-top: 12px;"> |
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form a Distributed Hash Table to discover each other's experts<br> |
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<span style="padding-left:24px"> |
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- the same type of protocol that powers BitTorrent file sharing.</span> |
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</li> |
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</ul> |
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<p> Hivemind uses <a href=https://pdos.csail.mit.edu/~petar/papers/maymounkov-kademlia-lncs.pdf target="_blank" rel="noopener noreferrer">Kademlia</a>-based DHT that can scale to tens of thousands of peers with logarithmic search complexity.</p> |
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<img src="hivemind_components.png" style="width:100%; max-width:240px"> |
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<p class="faded text" style="text-align: left;"> |
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On each forward pass, a peer first determines what "speciality" of experts is needed to process the current inputs using a small "gating function" module. Then it finds <i>k</i> (e.g. 4) most suitable experts from other peers in the network using the DHT protocol. Finally, it sends forward pass requests to the selected experts, collects their outputs and averages them for the final prediction. Compared to traditional architectures, the Mixture-of-Experts needs much less bandwidth as every input is only sent to a small fraction of all experts. |
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</p> |
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<div style="width:100%; max-width: 900px; vertical-align: top; display: inline-block; margin-top: 0px; align:center;"> |
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<p class="faded text" style="text-align: left; margin-top:5px"> |
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More importantly, the decentralized Mixture-of-Experts layers are inherently fault-tolerant: if some of the chosen experts fail to respond, the model will simply average the remaining ones and call that <a href=https://jmlr.org/papers/v15/srivastava14a.html target="_blank" rel="noopener noreferrer">dropout</a>. In the event that all <i>k</i> experts fail simultaneously, a peer will backtrack and find another <i>k</i> experts across the DHT. Finally, since every input is likely to be processed by different experts, hivemind peers run several <a href=https://papers.nips.cc/paper/4390-hogwild-a-lock-free-approach-to-parallelizing-stochastic-gradient-descent target="_blank" rel="noopener noreferrer">asynchronous training</a> batches to better utilize their hardware. |
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<br> |
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<p class="faded title" style="font-size:28px;"> |
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What is hivemind for? |
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</p> |
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<br> |
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<span class="faded text" style="margin-top:15px"> |
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Hivemind is designed for you to: |
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<ul style="text-align: middle; list-style-position: inside; margin-top: 16px; margin-left: -32px;"> |
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<li style="margin-top: 12px;"> |
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run crowdsourced deep learning using compute from volunteers or decentralized participants; </li> |
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<li style="margin-top: 12px;"> |
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train neural networks on multiple servers with varying compute, bandwidth and reliability; </li> |
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<li style="margin-top: 12px;"> |
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<i>[to be announced]</i> join a worldwide open deep learning experiment. </li> |
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</ul> |
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<br> |
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Conversely, here's what it <b>isn't</b> for: |
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<ul style="text-align: middle; list-style-position: inside; margin-top: 16px; margin-left: -32px;"> |
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<li style="margin-top: 12px;"> |
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splitting your model between 2-3 servers that you fully control: use <a href=https://pytorch.org/docs/stable/rpc.html target="_blank"rel="noopener noreferrer">torch.distributed.rpc</a>;</li> |
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<li style="margin-top: 12px;"> |
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distributed training for a reliable, uniform and highly connected cluster: use <a href=https://github.com/microsoft/DeepSpeed target="_blank"rel="noopener noreferrer">DeepSpeed</a>; </li> |
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<li style="margin-top: 12px;"> |
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training <span class="tooltip">small <span class="tooltiptext">More specifically, models that fit into a single worker's memory.</span></span> models with dynamically allocated of in-house workers: use <a href=https://pytorch.org/elastic/0.2.0/index.html>torch.elastic</a>.</li> |
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</ul> |
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<p style="margin-top: 16px; text-align:left"> |
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Hivemind v0.8 is in the early alpha stage: the core functionality to train |
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decentralized models is there, but the inferface is still in active development. |
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If you want to try hivemind for yourself or contribute to its development, |
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take a look at the <a href=https://learning-at-home.readthedocs.io/en/latest/user/quickstart.html><u>quickstart tutorial</u></a>. |
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Feel free to contact us <a href=https://github.com/learning-at-home/hivemind/issues target="_blank" rel="noopener noreferrer">on github</a> with any questions, feedback and issues. |
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SHOW_IF_WIDER_THAN = css_opts.getPropertyValue('--background-show-if-wider-than') || 500; |
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MOVE_ON_CURSOR = css_opts.getPropertyValue('--background-move-on-cursor').includes("true") || false; |
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var nodes = []; |
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choice = (choices => choices[Math.floor(Math.random() * choices.length)]) |
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sample_color = () => choice([[40, 40, 40], [133, 133, 133]]) |
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ANCHOR_LENGTH = 20; |
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var cursor = {x: 0, y: 0}; |
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function centralize_cursor() { |
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var rect = document.getElementById("bug-logo").getBoundingClientRect() |
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var window_left = window.pageXOffset || document.documentElement.scrollLeft; |
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var window_top = window.pageYOffset || document.documentElement.scrollTop; |
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cursor.x = window_left + rect.left + rect.width / 2; |
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cursor.y = window_top + rect.top + rect.height / 2; |
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} |
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function Node(x, y) { |
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this.anchorX = x; |
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this.anchorY = y; |
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this.x = Math.random() * (x - (x - ANCHOR_LENGTH)) + (x - ANCHOR_LENGTH); |
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this.y = Math.random() * (y - (y - ANCHOR_LENGTH)) + (y - ANCHOR_LENGTH); |
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this.vx = (Math.random() * 2 - 1) * SPEED_COEF; |
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this.vy = (Math.random() * 2 - 1) * SPEED_COEF; |
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this.energy = Math.random() * 100; |
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this.radius = Math.random(); |
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this.siblings = []; |
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[this.r, this.g, this.b] = sample_color() |
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this.brightness = 0; |
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} |
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Node.prototype.drawNode = function() { |
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var color = `rgba(${this.r}, ${this.g}, ${this.b}, ${this.brightness})`; |
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ctx.beginPath(); |
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ctx.arc(this.x, this.y, 2 * this.radius + 2 * this.siblings.length / SIBLINGS_LIMIT, 0, 2 * Math.PI); |
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ctx.fillStyle = color; |
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ctx.fill(); |
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}; |
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Node.prototype.drawConnections = function() { |
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for (var i = 0; i < this.siblings.length; i++) { |
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var color = `rgba(133, 133, 133, ${this.brightness})`; |
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ctx.beginPath(); |
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ctx.moveTo(this.x, this.y); |
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ctx.lineTo(this.siblings[i].x, this.siblings[i].y); |
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ctx.lineWidth = 1 - calcDistance(this, this.siblings[i]) / SENSITIVITY; |
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ctx.strokeStyle = color; |
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ctx.stroke(); |
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} |
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}; |
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Node.prototype.moveNode = function() { |
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this.energy -= ENERGY_DECAY; |
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if (this.energy < 1) { |
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this.energy = Math.random() * 100; |
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if (this.x - this.anchorX < -ANCHOR_LENGTH) { |
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this.vx = Math.random() * SPEED_COEF; |
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} else if (this.x - this.anchorX > ANCHOR_LENGTH) { |
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this.vx = Math.random() * -SPEED_COEF; |
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} else { |
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this.vx = Math.random() * SPEED_COEF * 2 - SPEED_COEF; |
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} |
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if (this.y - this.anchorY < -ANCHOR_LENGTH) { |
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this.vy = Math.random() * SPEED_COEF; |
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} else if (this.y - this.anchorY > ANCHOR_LENGTH) { |
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this.vy = Math.random() * -SPEED_COEF; |
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} else { |
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this.vy = Math.random() * SPEED_COEF * 2 - SPEED_COEF; |
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} |
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} |
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relative_speed_rate = Math.min(canvas.height / 100, 10.0) |
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this.x += this.vx * this.energy * relative_speed_rate; |
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this.y += this.vy * this.energy * relative_speed_rate; |
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}; |
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function initNodes() { |
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centralize_cursor(); |
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ctx.clearRect(0, 0, canvas.width, canvas.height); |
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if (canvas.width >= SHOW_IF_WIDER_THAN) |
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total_nodes = Math.round(NODE_DENSITY * (canvas.width / 100 * canvas.height / 100)); |
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else |
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total_nodes = 0; |
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nodes = []; |
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for (var i = 0; i < total_nodes; i++) |
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nodes.push(new Node(50 + Math.random() * (canvas.width - 100), |
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5 + Math.random() * (canvas.height - 10))); |
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} |
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function calcDistance(node1, node2) { |
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return Math.sqrt(Math.pow(node1.x - node2.x, 2) + (Math.pow(node1.y - node2.y, 2))); |
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} |
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function findSiblings() { |
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var node1, node2, distance; |
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for (var i = 0; i < nodes.length; i++) { |
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node1 = nodes[i]; |
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node1.siblings = []; |
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for (var j = 0; j < nodes.length; j++) { |
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node2 = nodes[j]; |
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if (node1 !== node2) { |
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distance = calcDistance(node1, node2); |
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if (distance < SENSITIVITY) { |
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if (node1.siblings.length < SIBLINGS_LIMIT) { |
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node1.siblings.push(node2); |
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} else { |
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var node_sibling_distance = 0; |
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var max_distance = 0; |
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var s; |
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for (var k = 0; k < SIBLINGS_LIMIT; k++) { |
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node_sibling_distance = calcDistance(node1, node1.siblings[k]); |
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if (node_sibling_distance > max_distance) { |
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max_distance = node_sibling_distance; |
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s = k; |
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} |
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} |
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if (distance < max_distance) { |
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node1.siblings.splice(s, 1); |
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node1.siblings.push(node2); |
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} |
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} |
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} |
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} |
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} |
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} |
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} |
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function redrawScene() { |
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resizeWindow(); |
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ctx.clearRect(0, 0, canvas.width, canvas.height); |
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findSiblings(); |
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var i, node, distance; |
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for (i = 0; i < nodes.length; i++) { |
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node = nodes[i]; |
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scaled_distance = calcDistance({x: cursor.x / CURSOR_WIDTH, y: cursor.y / CURSOR_HEIGHT}, |
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{x: node.x / CURSOR_WIDTH, y: node.y / CURSOR_HEIGHT}); |
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node.brightness = Math.max(1 - scaled_distance, 0); |
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} |
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for (i = 0; i < nodes.length; i++) { |
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node = nodes[i]; |
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if (node.brightness) { |
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node.drawConnections(); |
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node.drawNode(); |
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} |
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node.moveNode(); |
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} |
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requestAnimationFrame(redrawScene); |
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} |
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function initHandlers() { |
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document.addEventListener('resize', resizeWindow); |
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document.addEventListener('orientationchange', resizeWindow); |
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if (MOVE_ON_CURSOR) { |
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document.addEventListener('mousemove', moveHandler); |
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document.addEventListener('touchmove', moveHandler); |
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} |
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} |
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function resizeWindow(evt) { |
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var new_width, new_height; |
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new_width = Math.round(Math.max(title_elem.getBoundingClientRect().right, window.innerWidth)) |
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if (!MOVE_ON_CURSOR) |
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new_height = Math.round(title_elem.getBoundingClientRect().top - canvas.getBoundingClientRect().top); |
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else |
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new_height = Math.round(Math.max( |
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content_element.offsetHeight, content_element.scrollHeight, |
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content_element.clientHeight, window.innerHeight)); |
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if (canvas.width != new_width || canvas.height != new_height) { |
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canvas.width = new_width; |
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canvas.height = new_height; |
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initNodes(); |
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} |
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if (!MOVE_ON_CURSOR) |
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centralize_cursor(); |
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} |
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function moveHandler(evt) { |
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if (evt.type == "mousemove") { |
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cursor.x = window.pageXOffset + evt.clientX; |
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cursor.y = window.pageYOffset + evt.clientY; |
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} |
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else { |
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cursor.x = window.pageXOffset + evt.changedTouches[0].clientX; |
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cursor.y = window.pageYOffset + evt.changedTouches[0].clientY; |
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} |
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} |
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initHandlers(); |
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initNodes(); |
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redrawScene(); |
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|
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})(); |
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</script> |
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</body> |
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</html> |
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