p.background(30); p.fill(255); p.noStroke(); p.textSize(18); let t = p.frameCount % 450; // Phase identification let phaseStr = ""; if (t < 120) phaseStr = "1. Forward Pass (Activations)"; else if (t < 180) phaseStr = "2. Calculate Loss (Output Error)"; else if (t < 300) phaseStr = "3. Backpropagation (Propagating Gradients)"; else if (t < 380) phaseStr = "4. Optimization (Updating Weights)"; else phaseStr = "Iteration Complete"; p.text(phaseStr, 250, 30); // Define network layers and node coordinates const L0 = [{x:100, y:120}, {x:100, y:220}]; const L1 = [{x:250, y:80}, {x:250, y:170}, {x:250, y:260}]; const L2 = [{x:400, y:170}]; // 1. Draw base connections (weights) p.stroke(80); p.strokeWeight(2); for(let n0 of L0) for(let n1 of L1) p.line(n0.x, n0.y, n1.x, n1.y); for(let n1 of L1) for(let n2 of L2) p.line(n1.x, n1.y, n2.x, n2.y); // 2. Animate Data Flow p.noStroke(); if (t < 120) { // Forward Pass (Blue) p.fill(100, 200, 255); if (t < 60) { let pct = t / 60; for(let n0 of L0) for(let n1 of L1) { p.circle(p.lerp(n0.x, n1.x, pct), p.lerp(n0.y, n1.y, pct), 10); } } else { let pct = (t - 60) / 60; for(let n1 of L1) for(let n2 of L2) { p.circle(p.lerp(n1.x, n2.x, pct), p.lerp(n1.y, n2.y, pct), 10); } } } else if (t >= 180 && t < 300) { // Backward Pass (Red/Orange) p.fill(255, 100, 100); if (t < 240) { let pct = (t - 180) / 60; for(let n2 of L2) for(let n1 of L1) { p.circle(p.lerp(n2.x, n1.x, pct), p.lerp(n2.y, n1.y, pct), 10); } } else { let pct = (t - 240) / 60; for(let n1 of L1) for(let n0 of L0) { p.circle(p.lerp(n1.x, n0.x, pct), p.lerp(n1.y, n0.y, pct), 10); } } } else if (t >= 300 && t < 380) { // Flash connections (Green) to show weight updates let alpha = p.map(p.sin((t-300) * 0.15), -1, 1, 0, 200); p.stroke(100, 255, 120, alpha); p.strokeWeight(4); for(let n0 of L0) for(let n1 of L1) p.line(n0.x, n0.y, n1.x, n1.y); for(let n1 of L1) for(let n2 of L2) p.line(n1.x, n1.y, n2.x, n2.y); p.noStroke(); } // 3. Draw Nodes p.stroke(200); p.strokeWeight(2); let allNodes = [...L0, ...L1, ...L2]; for (let n of allNodes) { // Highlight output node during Loss calculation if (n === L2[0] && t >= 120 && t < 180) { p.fill(255, 80, 80); let s = 34 + p.sin((t - 120) * 0.2) * 8; // Pulsing effect p.circle(n.x, n.y, s); } else { p.fill(40); p.circle(n.x, n.y, 34); } } // 4. Draw Layer Labels p.fill(200); p.noStroke(); p.textSize(14); p.text("Input Layer", 100, 260); p.text("Hidden Layer", 250, 300); p.text("Output Layer", 400, 220);