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<li class="breadcrumb-item active">AdamWeightDecay</li>
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<a href="../../_sources/functionlib/dsplib/adamweightdecay.rst.txt" rel="nofollow"> 查看页面源码</a>
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<section id="adamweightdecay">
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<h1>AdamWeightDecay<a class="headerlink" href="#adamweightdecay" title="Link to this heading"></a></h1>
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<p>对权重张量执行 Adam Weight Decay 优化更新。</p>
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<blockquote>
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<div><div class="math notranslate nohighlight">
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\[\begin{split}\begin{aligned}
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m_t &= \beta_1 \cdot m_{t-1} + (1 - \beta_1) \cdot g_t \\
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v_t &= \beta_2 \cdot v_{t-1} + (1 - \beta_2) \cdot g_t^2 \\
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\hat{m}_t &= \frac{m_t}{\sqrt{v_t} + \epsilon} \\
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var_t &= var_{t-1} - lr \cdot (\hat{m}_t + decay \cdot var_{t-1})
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\end{aligned}\end{split}\]</div>
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<dl class="simple">
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<dt>输入：</dt><dd><ul class="simple">
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<li><p><strong>var</strong> - 待更新权重张量首地址。</p></li>
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<li><p><strong>m</strong> - 一阶动量张量首地址。</p></li>
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<li><p><strong>v</strong> - 二阶动量张量首地址。</p></li>
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<li><p><strong>gradient</strong> - 梯度张量首地址。</p></li>
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<li><p><strong>lr</strong> - 学习率。</p></li>
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<li><p><strong>beta1</strong> - 一阶动量衰减系数。</p></li>
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<li><p><strong>beta2</strong> - 二阶动量衰减系数。</p></li>
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<li><p><strong>epsilon</strong> - 数值稳定项。</p></li>
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<li><p><strong>decay</strong> - 权重衰减系数。</p></li>
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<li><p><strong>start</strong> - 参与计算的起始索引（闭区间）。</p></li>
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<li><p><strong>end</strong> - 参与计算的结束索引（开区间）。</p></li>
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<li><p><strong>core_mask(int, 可选)</strong> - 核掩码（仅适用于共享存储版本）。</p></li>
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</ul>
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</dd>
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<dt>输出：</dt><dd><ul class="simple">
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<li><p><strong>var</strong> - 原地写回更新后的权重张量。</p></li>
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<li><p><strong>m</strong> - 原地写回更新后的一阶动量张量。</p></li>
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<li><p><strong>v</strong> - 原地写回更新后的二阶动量张量。</p></li>
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</ul>
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</dd>
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<dt>支持平台：</dt><dd><p><code class="docutils literal notranslate"><span class="pre">FT78NE</span></code>
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<code class="docutils literal notranslate"><span class="pre">MT7004</span></code></p>
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</dd>
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</dl>
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<div class="admonition note">
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<p class="admonition-title">备注</p>
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<ul class="simple">
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<li><p>FT78NE 支持 fp32 数据类型。</p></li>
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<li><p>MT7004 支持 fp16、fp32 数据类型。</p></li>
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</ul>
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</div>
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</div></blockquote>
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<p><strong>共享存储版本:</strong></p>
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<dl class="c function">
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<dt class="sig sig-object c" id="c.hp_adamweightdecay_s">
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<span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">hp_adamweightdecay_s</span></span></span><span class="sig-paren">(</span><span class="n"><span class="pre">half</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">var</span></span>, <span class="n"><span class="pre">half</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">m</span></span>, <span class="n"><span class="pre">half</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">v</span></span>, <span class="k"><span class="pre">const</span></span><span class="w"> </span><span class="n"><span class="pre">half</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">gradient</span></span>, <span class="kt"><span class="pre">float</span></span><span class="w"> </span><span class="n"><span class="pre">lr</span></span>, <span class="kt"><span class="pre">float</span></span><span class="w"> </span><span class="n"><span class="pre">beta1</span></span>, <span class="kt"><span class="pre">float</span></span><span class="w"> </span><span class="n"><span class="pre">beta2</span></span>, <span class="kt"><span class="pre">float</span></span><span class="w"> </span><span class="n"><span class="pre">epsilon</span></span>, <span class="kt"><span class="pre">float</span></span><span class="w"> </span><span class="n"><span class="pre">decay</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n"><span class="pre">start</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n"><span class="pre">end</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n"><span class="pre">core_mask</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.hp_adamweightdecay_s" title="Link to this definition"></a><br /></dt>
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<dd></dd></dl>
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<dl class="c function">
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<dt class="sig sig-object c" id="c.fp_adamweightdecay_s">
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<span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">fp_adamweightdecay_s</span></span></span><span class="sig-paren">(</span><span class="kt"><span class="pre">float</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">var</span></span>, <span class="kt"><span class="pre">float</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">m</span></span>, <span class="kt"><span class="pre">float</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">v</span></span>, <span class="k"><span class="pre">const</span></span><span class="w"> </span><span class="kt"><span class="pre">float</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">gradient</span></span>, <span class="kt"><span class="pre">float</span></span><span class="w"> </span><span class="n"><span class="pre">lr</span></span>, <span class="kt"><span class="pre">float</span></span><span class="w"> </span><span class="n"><span class="pre">beta1</span></span>, <span class="kt"><span class="pre">float</span></span><span class="w"> </span><span class="n"><span class="pre">beta2</span></span>, <span class="kt"><span class="pre">float</span></span><span class="w"> </span><span class="n"><span class="pre">epsilon</span></span>, <span class="kt"><span class="pre">float</span></span><span class="w"> </span><span class="n"><span class="pre">decay</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n"><span class="pre">start</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n"><span class="pre">end</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n"><span class="pre">core_mask</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.fp_adamweightdecay_s" title="Link to this definition"></a><br /></dt>
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<dd><p><strong>C调用示例：</strong></p>
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<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="linenos"> 1</span><span class="c1">// FT78NE 多核示例</span>
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<span class="linenos"> 2</span><span class="cp">#include</span><span class="w"> </span><span class="cpf"><stdio.h></span>
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<span class="linenos"> 3</span>
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<span class="linenos"> 4</span><span class="kt">int</span><span class="w"> </span><span class="nf">main</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
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<span class="linenos"> 5</span><span class="w"> </span><span class="kt">float</span><span class="w"> </span><span class="o">*</span><span class="n">var</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="kt">float</span><span class="w"> </span><span class="o">*</span><span class="p">)</span><span class="mh">0xA0000000</span><span class="p">;</span><span class="w"> </span><span class="c1">// DDR 存储</span>
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<span class="linenos"> 6</span><span class="w"> </span><span class="kt">float</span><span class="w"> </span><span class="o">*</span><span class="n">m</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="kt">float</span><span class="w"> </span><span class="o">*</span><span class="p">)</span><span class="mh">0xB0000000</span><span class="p">;</span>
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<span class="linenos"> 7</span><span class="w"> </span><span class="kt">float</span><span class="w"> </span><span class="o">*</span><span class="n">v</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="kt">float</span><span class="w"> </span><span class="o">*</span><span class="p">)</span><span class="mh">0xC0000000</span><span class="p">;</span>
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<span class="linenos"> 8</span><span class="w"> </span><span class="kt">float</span><span class="w"> </span><span class="o">*</span><span class="n">gradient</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="kt">float</span><span class="w"> </span><span class="o">*</span><span class="p">)</span><span class="mh">0xD0000000</span><span class="p">;</span>
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<span class="linenos"> 9</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">start</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
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<span class="linenos">10</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">end</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">4096</span><span class="p">;</span>
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<span class="linenos">11</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">core_mask</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mh">0xff</span><span class="p">;</span>
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<span class="linenos">12</span><span class="w"> </span><span class="kt">float</span><span class="w"> </span><span class="n">lr</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mf">1e-3f</span><span class="p">;</span>
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<span class="linenos">13</span><span class="w"> </span><span class="kt">float</span><span class="w"> </span><span class="n">beta1</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mf">0.9f</span><span class="p">;</span>
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<span class="linenos">14</span><span class="w"> </span><span class="kt">float</span><span class="w"> </span><span class="n">beta2</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mf">0.999f</span><span class="p">;</span>
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<span class="linenos">15</span><span class="w"> </span><span class="kt">float</span><span class="w"> </span><span class="n">epsilon</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mf">1e-8f</span><span class="p">;</span>
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<span class="linenos">16</span><span class="w"> </span><span class="kt">float</span><span class="w"> </span><span class="n">decay</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mf">1e-2f</span><span class="p">;</span>
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<span class="hll"><span class="linenos">17</span><span class="w"> </span><span class="n">fp_adamweightdecay_s</span><span class="p">(</span><span class="n">var</span><span class="p">,</span><span class="w"> </span><span class="n">m</span><span class="p">,</span><span class="w"> </span><span class="n">v</span><span class="p">,</span><span class="w"> </span><span class="n">gradient</span><span class="p">,</span><span class="w"> </span><span class="n">lr</span><span class="p">,</span>
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</span><span class="hll"><span class="linenos">18</span><span class="w"> </span><span class="n">beta1</span><span class="p">,</span><span class="w"> </span><span class="n">beta2</span><span class="p">,</span><span class="w"> </span><span class="n">epsilon</span><span class="p">,</span><span class="w"> </span><span class="n">decay</span><span class="p">,</span>
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</span><span class="hll"><span class="linenos">19</span><span class="w"> </span><span class="n">start</span><span class="p">,</span><span class="w"> </span><span class="n">end</span><span class="p">,</span><span class="w"> </span><span class="n">core_mask</span><span class="p">);</span>
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</span><span class="linenos">20</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
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<span class="linenos">21</span><span class="p">}</span>
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</pre></div>
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</div>
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</dd></dl>
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<p><strong>私有存储版本:</strong></p>
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<dl class="c function">
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<dt class="sig sig-object c" id="c.hp_adamweightdecay_p">
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<span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">hp_adamweightdecay_p</span></span></span><span class="sig-paren">(</span><span class="n"><span class="pre">half</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">var</span></span>, <span class="n"><span class="pre">half</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">m</span></span>, <span class="n"><span class="pre">half</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">v</span></span>, <span class="k"><span class="pre">const</span></span><span class="w"> </span><span class="n"><span class="pre">half</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">gradient</span></span>, <span class="kt"><span class="pre">float</span></span><span class="w"> </span><span class="n"><span class="pre">lr</span></span>, <span class="kt"><span class="pre">float</span></span><span class="w"> </span><span class="n"><span class="pre">beta1</span></span>, <span class="kt"><span class="pre">float</span></span><span class="w"> </span><span class="n"><span class="pre">beta2</span></span>, <span class="kt"><span class="pre">float</span></span><span class="w"> </span><span class="n"><span class="pre">epsilon</span></span>, <span class="kt"><span class="pre">float</span></span><span class="w"> </span><span class="n"><span class="pre">decay</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n"><span class="pre">length</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.hp_adamweightdecay_p" title="Link to this definition"></a><br /></dt>
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<dd></dd></dl>
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<dl class="c function">
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<dt class="sig sig-object c" id="c.fp_adamweightdecay_p">
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<span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">fp_adamweightdecay_p</span></span></span><span class="sig-paren">(</span><span class="kt"><span class="pre">float</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">var</span></span>, <span class="kt"><span class="pre">float</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">m</span></span>, <span class="kt"><span class="pre">float</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">v</span></span>, <span class="k"><span class="pre">const</span></span><span class="w"> </span><span class="kt"><span class="pre">float</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">gradient</span></span>, <span class="kt"><span class="pre">float</span></span><span class="w"> </span><span class="n"><span class="pre">lr</span></span>, <span class="kt"><span class="pre">float</span></span><span class="w"> </span><span class="n"><span class="pre">beta1</span></span>, <span class="kt"><span class="pre">float</span></span><span class="w"> </span><span class="n"><span class="pre">beta2</span></span>, <span class="kt"><span class="pre">float</span></span><span class="w"> </span><span class="n"><span class="pre">epsilon</span></span>, <span class="kt"><span class="pre">float</span></span><span class="w"> </span><span class="n"><span class="pre">decay</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n"><span class="pre">length</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.fp_adamweightdecay_p" title="Link to this definition"></a><br /></dt>
|
||
<dd><p><strong>C调用示例：</strong></p>
|
||
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="linenos"> 1</span><span class="c1">// MT7004 单核示例</span>
|
||
<span class="linenos"> 2</span><span class="cp">#include</span><span class="w"> </span><span class="cpf"><stdio.h></span>
|
||
<span class="linenos"> 3</span>
|
||
<span class="linenos"> 4</span><span class="kt">int</span><span class="w"> </span><span class="nf">main</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
|
||
<span class="linenos"> 5</span><span class="w"> </span><span class="n">half</span><span class="w"> </span><span class="o">*</span><span class="n">var</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="n">half</span><span class="w"> </span><span class="o">*</span><span class="p">)</span><span class="mh">0x10000000</span><span class="p">;</span><span class="w"> </span><span class="c1">// L2 存储</span>
|
||
<span class="linenos"> 6</span><span class="w"> </span><span class="n">half</span><span class="w"> </span><span class="o">*</span><span class="n">m</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="n">half</span><span class="w"> </span><span class="o">*</span><span class="p">)</span><span class="mh">0x10002000</span><span class="p">;</span>
|
||
<span class="linenos"> 7</span><span class="w"> </span><span class="n">half</span><span class="w"> </span><span class="o">*</span><span class="n">v</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="n">half</span><span class="w"> </span><span class="o">*</span><span class="p">)</span><span class="mh">0x10004000</span><span class="p">;</span>
|
||
<span class="linenos"> 8</span><span class="w"> </span><span class="n">half</span><span class="w"> </span><span class="o">*</span><span class="n">gradient</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="n">half</span><span class="w"> </span><span class="o">*</span><span class="p">)</span><span class="mh">0x10006000</span><span class="p">;</span>
|
||
<span class="linenos"> 9</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">length</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">2048</span><span class="p">;</span>
|
||
<span class="linenos">10</span><span class="w"> </span><span class="kt">float</span><span class="w"> </span><span class="n">lr</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mf">5e-4f</span><span class="p">;</span>
|
||
<span class="linenos">11</span><span class="w"> </span><span class="kt">float</span><span class="w"> </span><span class="n">beta1</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mf">0.9f</span><span class="p">;</span>
|
||
<span class="linenos">12</span><span class="w"> </span><span class="kt">float</span><span class="w"> </span><span class="n">beta2</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mf">0.999f</span><span class="p">;</span>
|
||
<span class="linenos">13</span><span class="w"> </span><span class="kt">float</span><span class="w"> </span><span class="n">epsilon</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mf">1e-6f</span><span class="p">;</span>
|
||
<span class="linenos">14</span><span class="w"> </span><span class="kt">float</span><span class="w"> </span><span class="n">decay</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mf">5e-3f</span><span class="p">;</span>
|
||
<span class="hll"><span class="linenos">15</span><span class="w"> </span><span class="n">hp_adamweightdecay_p</span><span class="p">(</span><span class="n">var</span><span class="p">,</span><span class="w"> </span><span class="n">m</span><span class="p">,</span><span class="w"> </span><span class="n">v</span><span class="p">,</span><span class="w"> </span><span class="n">gradient</span><span class="p">,</span><span class="w"> </span><span class="n">lr</span><span class="p">,</span>
|
||
</span><span class="hll"><span class="linenos">16</span><span class="w"> </span><span class="n">beta1</span><span class="p">,</span><span class="w"> </span><span class="n">beta2</span><span class="p">,</span><span class="w"> </span><span class="n">epsilon</span><span class="p">,</span><span class="w"> </span><span class="n">decay</span><span class="p">,</span>
|
||
</span><span class="hll"><span class="linenos">17</span><span class="w"> </span><span class="n">length</span><span class="p">);</span>
|
||
</span><span class="linenos">18</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
|
||
<span class="linenos">19</span><span class="p">}</span>
|
||
</pre></div>
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