http://log4.love/tags/%E7%BC%96%E7%A8%8B/Recent content in 编程 on Captain CrystalHugozh-cnFri, 20 Mar 2026 00:00:00 +0000http://log4.love/projects/crystal-demand-nowcast/Fri, 20 Mar 2026 00:00:00 +0000http://log4.love/projects/crystal-demand-nowcast/<h2 id="在做什么">在做什么</h2> <p>一个很小的预测练习：用历史数据猜接下来几天的大概走势，用来练手、也练互相讲清楚「模型在干嘛」。</p> <h2 id="我们学到的">我们学到的</h2> <ul> <li>数据对齐比换花哨模型更重要，不然结果再好看也不踏实。</li> <li>一个人写代码、另一个人问「这一步为什么合理」，搭档起来很安心。</li> </ul> <div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-python" data-lang="python"><span style="display:flex;"><span><span style="color:#75715e"># 示意：分段时间验证，避免偷看未来</span> </span></span><span style="display:flex;"><span><span style="color:#66d9ef">def</span> <span style="color:#a6e22e">walk_forward_score</span>(model, frames): </span></span><span style="display:flex;"><span> <span style="color:#66d9ef">return</span> [model<span style="color:#f92672">.</span>fit(f<span style="color:#f92672">.</span>train)<span style="color:#f92672">.</span>score(f<span style="color:#f92672">.</span>test) <span style="color:#66d9ef">for</span> f <span style="color:#f92672">in</span> frames] </span></span></code></pre></div>