sanbuphy
79 lines
4.0 KiB
Vue
79 lines
4.0 KiB
Vue
<template>
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<div class="demo-card">
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<div class="bp-flow">
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<div v-for="(step, i) in steps" :key="i" class="step-block" :style="{ borderTopColor: step.color }">
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<div class="step-num" :style="{ background: step.color }">{{ i + 1 }}</div>
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<div class="step-icon">{{ step.icon }}</div>
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<div class="step-name">{{ step.name }}</div>
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<div class="step-desc">{{ step.desc }}</div>
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</div>
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</div>
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<div class="loss-visual">
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<div class="loss-label">Loss（误差）随训练轮次下降：</div>
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<svg viewBox="0 0 320 130" class="loss-svg">
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<!-- Axes -->
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<line x1="40" y1="110" x2="300" y2="110" stroke="var(--vp-c-text-3)" stroke-width="1.5" />
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<line x1="40" y1="110" x2="40" y2="15" stroke="var(--vp-c-text-3)" stroke-width="1.5" />
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<!-- X Arrow -->
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<polygon points="300,107 305,110 300,113" fill="var(--vp-c-text-3)" />
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<!-- Y Arrow -->
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<polygon points="37,15 40,10 43,15" fill="var(--vp-c-text-3)" />
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<!-- Y Label -->
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<text x="30" y="25" text-anchor="end" class="ax-text">高</text>
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<text x="30" y="105" text-anchor="end" class="ax-text">低</text>
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<text x="20" y="65" text-anchor="middle" transform="rotate(-90 20 65)" class="ax-title">Loss</text>
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<!-- X Label -->
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<text x="300" y="125" text-anchor="end" class="ax-title">训练轮次 (Epochs)</text>
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<!-- Loss 曲线 -->
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<polyline :points="lossPoints" fill="none" stroke="var(--vp-c-brand)" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round" />
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</svg>
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</div>
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</div>
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</template>
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<script setup>
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const steps = [
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{ icon: '➡️', name: '前向传播', desc: '数据流过网络，得出预测', color: '#3b82f6' },
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{ icon: '📐', name: '计算误差', desc: '预测值 vs 正确答案，算 Loss', color: '#d97706' },
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{ icon: '⬅️', name: '反向传播', desc: '逐层追溯每个权重的"责任"', color: '#dc2626' },
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{ icon: '⚙️', name: '更新权重', desc: '按责任微调，减少下次误差', color: '#059669' },
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]
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const lossPoints = (() => {
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const pts = []
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for (let i = 0; i <= 50; i++) {
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const x = 40 + i * 5; // 40 to 290
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// Y从上(小值)到下(大值)，Loss越来越低，意味着Y越来越大，靠近110
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// 我们让一开始的高Loss出现在 y=20 附近，最终的低Loss停留 在 y=105 附近
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let noise = (Math.random() - 0.5) * 3;
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let y = 105 - 85 * Math.exp(-i * 0.12) + noise;
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if (i === 0) y = 20; // 确保起点干净
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if (y > 108) y = 108; // 不超过底轴
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pts.push(`${x},${y}`)
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}
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return pts.join(' ')
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})()
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</script>
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<style scoped>
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.demo-card { border: 1px solid var(--vp-c-divider); border-radius: 8px; background: var(--vp-c-bg-soft); padding: 1.25rem; margin: 1rem 0; }
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.bp-flow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.5rem; margin-bottom: 0.8rem; }
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@media (max-width: 600px) { .bp-flow { grid-template-columns: repeat(2, 1fr); } }
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.step-block { background: var(--vp-c-bg); border: 1px solid var(--vp-c-divider); border-top: 3px solid; border-radius: 6px; padding: 0.7rem 0.5rem; display: flex; flex-direction: column; align-items: center; gap: 0.25rem; text-align: center; }
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.step-num { width: 16px; height: 16px; border-radius: 50%; color: white; font-size: 0.6rem; font-weight: bold; display: flex; align-items: center; justify-content: center; }
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.step-icon { font-size: 1.2rem; }
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.step-name { font-weight: bold; font-size: 0.78rem; }
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.step-desc { font-size: 0.68rem; color: var(--vp-c-text-2); line-height: 1.3; }
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.loss-visual { background: var(--vp-c-bg); border: 1px solid var(--vp-c-divider); border-radius: 6px; padding: 0.7rem; }
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.loss-label { font-size: 0.75rem; color: var(--vp-c-text-2); margin-bottom: 0.3rem; }
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.loss-svg { width: 100%; max-width: 460px; height: auto; display: block; margin: 0 auto; overflow: visible; font-family: sans-serif; }
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.axis-line { color: var(--vp-c-text-3); }
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.ax-text { font-size: 10px; fill: var(--vp-c-text-2); }
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.ax-title { font-size: 11px; fill: var(--vp-c-text-1); font-weight: 500; }
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</style>
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