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<li class="breadcrumb-item active">Subgrad</li>
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<a href="../../_sources/functionlib/dsplib/subgrad.rst.txt" rel="nofollow"> 查看页面源码</a>
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<section id="subgrad">
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<h1>Subgrad<a class="headerlink" href="#subgrad" title="Link to this heading"></a></h1>
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<p>计算逐元素减法（Sub）操作的梯度。该算子是 Sub 算子的反向传播（backward pass）部分，支持广播。</p>
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<div class="math notranslate nohighlight">
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\[\text{dx1} = \frac{\partial L}{\partial X1} = \frac{\partial L}{\partial Y} \times 1 = \frac{\partial L}{\partial Y}\]</div>
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<div class="math notranslate nohighlight">
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\[\text{dx2} = \frac{\partial L}{\partial X2} = \frac{\partial L}{\partial Y} \times (-1) = -\frac{\partial L}{\partial Y}\]</div>
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<p>其中对于前向操作 <span class="math notranslate nohighlight">\(Y = X1 - X2\)</span>，<cite>dy</cite> 是来自后一层的上游梯度，<cite>dx1</cite> 和 <cite>dx2</cite> 分别是对 <cite>X1</cite> 和 <cite>X2</cite> 的梯度。</p>
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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>dy</strong> - 上游梯度数据地址（即 <span class="math notranslate nohighlight">\(\frac{\partial L}{\partial Y}\)</span>）。</p></li>
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<li><p><strong>x1_dims</strong> - 前向传播时第一个输入 <cite>x1</cite> 的维度信息数组（int*）。</p></li>
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<li><p><strong>x2_dims</strong> - 前向传播时第二个输入 <cite>x2</cite> 的维度信息数组（int*）。</p></li>
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<li><p><strong>dy_dims</strong> - 上游梯度 <cite>dy</cite> 的维度信息数组（int*）。</p></li>
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<li><p><strong>num_dims</strong> - 维度数（int）。</p></li>
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<li><p><strong>core_mask</strong> - 核掩码（int），仅共享存储版本需要。</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>dx1</strong> - 对 <cite>x1</cite> 的梯度数据地址。</p></li>
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<li><p><strong>dx2</strong> - 对 <cite>x2</cite> 的梯度数据地址。</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>MT7004 支持fp16, fp32</p></li>
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<li><p>FT78NE 支持fp32</p></li>
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<li><p>当输入张量被广播时，算子会自动处理广播维度的梯度累加</p></li>
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</ul>
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</div>
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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_subgrad_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_subgrad_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">dy</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">x1_dims</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">x2_dims</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">dy_dims</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n"><span class="pre">num_dims</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">dx1</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">dx2</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_subgrad_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_subgrad_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_subgrad_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">dy</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">x1_dims</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">x2_dims</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">dy_dims</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n"><span class="pre">num_dims</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">dx1</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">dx2</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_subgrad_s" title="Link to this definition"></a><br /></dt>
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<dd></dd></dl>
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<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">//MT7004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><span class="cp">#include</span><span class="w"> </span><span class="cpf"><subgrad.h></span>
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<span class="linenos"> 4</span>
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<span class="linenos"> 5</span><span class="kt">int</span><span class="w"> </span><span class="nf">main</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">argc</span><span class="p">,</span><span class="w"> </span><span class="kt">char</span><span class="o">*</span><span class="w"> </span><span class="n">argv</span><span class="p">[])</span><span class="w"> </span><span class="p">{</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">dy</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">// 上游梯度在DDR空间</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">dx1</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><span class="w"> </span><span class="c1">// dx1输出</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">dx2</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><span class="w"> </span><span class="c1">// dx2输出</span>
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<span class="linenos"> 9</span>
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<span class="linenos">10</span><span class="w"> </span><span class="c1">// 示例：x1形状 [3, 1]，x2形状 [1, 4]，dy形状 [3, 4]</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">x1_dims</span><span class="p">[]</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span><span class="mi">3</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="p">};</span>
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<span class="linenos">12</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">x2_dims</span><span class="p">[]</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">4</span><span class="p">};</span>
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<span class="linenos">13</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">dy_dims</span><span class="p">[]</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span><span class="mi">3</span><span class="p">,</span><span class="w"> </span><span class="mi">4</span><span class="p">};</span>
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<span class="linenos">14</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">num_dims</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">2</span><span class="p">;</span>
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<span class="linenos">15</span>
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<span class="linenos">16</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">17</span>
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<span class="hll"><span class="linenos">18</span><span class="w"> </span><span class="n">fp_subgrad_s</span><span class="p">(</span><span class="n">dy</span><span class="p">,</span><span class="w"> </span><span class="n">x1_dims</span><span class="p">,</span><span class="w"> </span><span class="n">x2_dims</span><span class="p">,</span><span class="w"> </span><span class="n">dy_dims</span><span class="p">,</span><span class="w"> </span><span class="n">num_dims</span><span class="p">,</span><span class="w"> </span><span class="n">dx1</span><span class="p">,</span><span class="w"> </span><span class="n">dx2</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">19</span>
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<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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<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_subgrad_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_subgrad_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">dy</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">x1_dims</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">x2_dims</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">dy_dims</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n"><span class="pre">num_dims</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">dx1</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">dx2</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.hp_subgrad_p" title="Link to this definition"></a><br /></dt>
|
||
<dd></dd></dl>
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<dl class="c function">
|
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<dt class="sig sig-object c" id="c.fp_subgrad_p">
|
||
<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_subgrad_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">dy</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">x1_dims</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">x2_dims</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">dy_dims</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n"><span class="pre">num_dims</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">dx1</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">dx2</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.fp_subgrad_p" title="Link to this definition"></a><br /></dt>
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<dd></dd></dl>
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<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><span class="cp">#include</span><span class="w"> </span><span class="cpf"><subgrad.h></span>
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<span class="linenos"> 4</span>
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<span class="linenos"> 5</span><span class="kt">int</span><span class="w"> </span><span class="nf">main</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">argc</span><span class="p">,</span><span class="w"> </span><span class="kt">char</span><span class="o">*</span><span class="w"> </span><span class="n">argv</span><span class="p">[])</span><span class="w"> </span><span class="p">{</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">dy</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">0x10000000</span><span class="p">;</span><span class="w"> </span><span class="c1">// 上游梯度在L2空间</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">dx1</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">0x10001000</span><span class="p">;</span><span class="w"> </span><span class="c1">// dx1输出</span>
|
||
<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">dx2</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">0x10002000</span><span class="p">;</span><span class="w"> </span><span class="c1">// dx2输出</span>
|
||
<span class="linenos"> 9</span>
|
||
<span class="linenos">10</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">x1_dims</span><span class="p">[]</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span><span class="mi">3</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="p">};</span>
|
||
<span class="linenos">11</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">x2_dims</span><span class="p">[]</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">4</span><span class="p">};</span>
|
||
<span class="linenos">12</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">dy_dims</span><span class="p">[]</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span><span class="mi">3</span><span class="p">,</span><span class="w"> </span><span class="mi">4</span><span class="p">};</span>
|
||
<span class="linenos">13</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">num_dims</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">2</span><span class="p">;</span>
|
||
<span class="linenos">14</span>
|
||
<span class="hll"><span class="linenos">15</span><span class="w"> </span><span class="n">fp_subgrad_p</span><span class="p">(</span><span class="n">dy</span><span class="p">,</span><span class="w"> </span><span class="n">x1_dims</span><span class="p">,</span><span class="w"> </span><span class="n">x2_dims</span><span class="p">,</span><span class="w"> </span><span class="n">dy_dims</span><span class="p">,</span><span class="w"> </span><span class="n">num_dims</span><span class="p">,</span><span class="w"> </span><span class="n">dx1</span><span class="p">,</span><span class="w"> </span><span class="n">dx2</span><span class="p">);</span>
|
||
</span><span class="linenos">16</span>
|
||
<span class="linenos">17</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">18</span><span class="p">}</span>
|
||
</pre></div>
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