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<a href="https://github.com/labmlai/annotated_deep_learning_paper_implementations/tree/master/labml_nn/transformers/retro/dataset.py" target="_blank">
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View code on Github</a>
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<a href='#section-0'>#</a>
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</div>
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<h1>RETRO training dataset</h1>
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<p>We pre-retrieve nearest neighbors from the <a href="database.html">key-value database</a> and create the dataset to train the <a href="index.html">RETRO</a> <a href="model.html">model</a>.</p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">15</span><span></span><span class="kn">import</span> <span class="nn">json</span>
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<span class="lineno">16</span><span class="kn">from</span> <span class="nn">pathlib</span> <span class="kn">import</span> <span class="n">Path</span>
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<span class="lineno">17</span>
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<span class="lineno">18</span><span class="kn">import</span> <span class="nn">numpy</span> <span class="k">as</span> <span class="nn">np</span>
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<span class="lineno">19</span><span class="kn">import</span> <span class="nn">torch</span>
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<span class="lineno">20</span><span class="kn">from</span> <span class="nn">torch.utils.data</span> <span class="kn">import</span> <span class="n">Dataset</span> <span class="k">as</span> <span class="n">PyTorchDataset</span>
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<span class="lineno">21</span>
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<span class="lineno">22</span><span class="kn">from</span> <span class="nn">labml</span> <span class="kn">import</span> <span class="n">lab</span><span class="p">,</span> <span class="n">monit</span>
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<span class="lineno">23</span><span class="kn">from</span> <span class="nn">labml_helpers.datasets.text</span> <span class="kn">import</span> <span class="n">TextFileDataset</span><span class="p">,</span> <span class="n">TextDataset</span>
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<span class="lineno">24</span><span class="kn">from</span> <span class="nn">labml_nn.transformers.retro.database</span> <span class="kn">import</span> <span class="n">RetroIndex</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-1'>
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<div class='docs doc-strings'>
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<div class='section-link'>
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<a href='#section-1'>#</a>
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</div>
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<h2>Build the dataset</h2>
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<ul><li><code class="highlight"><span></span><span class="n">chunk_len</span></code>
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is the chunk length </li>
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<li><code class="highlight"><span></span><span class="n">chunks_per_sample</span></code>
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is the number of chunks per training sample </li>
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<li><code class="highlight"><span></span><span class="n">skip_range</span></code>
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is the maximum number of characters to skip between two samples. We skip a few characters between samples to make sure the samples aren't aligned perfectly with the chunks in the <a href="database.html">database</a></li></ul>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">27</span><span class="k">def</span> <span class="nf">build_dataset</span><span class="p">(</span><span class="n">chunk_len</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">16</span><span class="p">,</span> <span class="n">chunks_per_sample</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">32</span><span class="p">,</span> <span class="n">skip_range</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">8</span><span class="p">):</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-2'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-2'>#</a>
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</div>
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<p>Load the text file </p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">39</span> <span class="n">dataset</span> <span class="o">=</span> <span class="n">TextFileDataset</span><span class="p">(</span>
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<span class="lineno">40</span> <span class="n">lab</span><span class="o">.</span><span class="n">get_data_path</span><span class="p">()</span> <span class="o">/</span> <span class="s1">'tiny_shakespeare.txt'</span><span class="p">,</span>
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<span class="lineno">41</span> <span class="nb">list</span><span class="p">,</span>
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<span class="lineno">42</span> <span class="n">url</span><span class="o">=</span><span class="s1">'https://raw.githubusercontent.com/karpathy/char-rnn/master/data/tinyshakespeare/input.txt'</span><span class="p">)</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-3'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-3'>#</a>
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</div>
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<p>Training portion of it </p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">45</span> <span class="n">text</span> <span class="o">=</span> <span class="n">dataset</span><span class="o">.</span><span class="n">train</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-4'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-4'>#</a>
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</div>
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<p>Load the index for retrieving neighbors </p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">48</span> <span class="n">index</span> <span class="o">=</span> <span class="n">RetroIndex</span><span class="p">()</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-5'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-5'>#</a>
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</div>
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<p>The input sample offsets </p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">51</span> <span class="n">sample_offsets</span> <span class="o">=</span> <span class="p">[]</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-6'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-6'>#</a>
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</div>
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<p>Cursor for the text </p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">53</span> <span class="n">i</span> <span class="o">=</span> <span class="mi">0</span>
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<span class="lineno">54</span> <span class="k">while</span> <span class="n">i</span> <span class="o"><</span> <span class="nb">len</span><span class="p">(</span><span class="n">text</span><span class="p">):</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-7'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-7'>#</a>
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</div>
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<p>Skip a few characters to make sure it's not aligned with the neighbors </p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">56</span> <span class="n">skip</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">random</span><span class="o">.</span><span class="n">randint</span><span class="p">(</span><span class="n">skip_range</span><span class="p">)</span>
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<span class="lineno">57</span> <span class="n">i</span> <span class="o">+=</span> <span class="n">skip</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-8'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-8'>#</a>
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</div>
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<p>Stop if we've reached the end of the text </p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">60</span> <span class="k">if</span> <span class="n">i</span> <span class="o">+</span> <span class="n">chunks_per_sample</span> <span class="o">*</span> <span class="n">chunk_len</span> <span class="o">></span> <span class="nb">len</span><span class="p">(</span><span class="n">text</span><span class="p">):</span>
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<span class="lineno">61</span> <span class="k">break</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-9'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-9'>#</a>
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</div>
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<p>Collect the offset </p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">64</span> <span class="n">sample_offsets</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">i</span><span class="p">)</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-10'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-10'>#</a>
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</div>
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<p>Increment the cursor </p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">67</span> <span class="n">i</span> <span class="o">+=</span> <span class="n">chunks_per_sample</span> <span class="o">*</span> <span class="n">chunk_len</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-11'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-11'>#</a>
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</div>
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<p>For samples </p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">70</span> <span class="n">samples</span> <span class="o">=</span> <span class="p">[]</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-12'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-12'>#</a>
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</div>
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<p>Iterate through sample offsets </p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">72</span> <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="n">monit</span><span class="o">.</span><span class="n">iterate</span><span class="p">(</span><span class="s1">'Gather Neighbors'</span><span class="p">,</span> <span class="n">sample_offsets</span><span class="p">):</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-13'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-13'>#</a>
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</div>
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<p>Get the sample including an extra character (for prediction) </p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">74</span> <span class="n">sample</span> <span class="o">=</span> <span class="n">text</span><span class="p">[</span><span class="n">i</span><span class="p">:</span> <span class="n">i</span> <span class="o">+</span> <span class="n">chunks_per_sample</span> <span class="o">*</span> <span class="n">chunk_len</span> <span class="o">+</span> <span class="mi">1</span><span class="p">]</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-14'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-14'>#</a>
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</div>
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<p>The input </p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">76</span> <span class="n">src</span> <span class="o">=</span> <span class="n">sample</span><span class="p">[:</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-15'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-15'>#</a>
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</div>
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<p>Break it into chunks </p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">78</span> <span class="n">chunks</span> <span class="o">=</span> <span class="p">[</span><span class="n">src</span><span class="p">[</span><span class="n">j</span><span class="p">:</span><span class="n">j</span> <span class="o">+</span> <span class="n">chunk_len</span><span class="p">]</span> <span class="k">for</span> <span class="n">j</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="nb">len</span><span class="p">(</span><span class="n">src</span><span class="p">),</span> <span class="n">chunk_len</span><span class="p">)]</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-16'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-16'>#</a>
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</div>
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<p>The chunk offsets </p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">80</span> <span class="n">chunk_offsets</span> <span class="o">=</span> <span class="p">[</span><span class="n">j</span> <span class="o">+</span> <span class="n">i</span> <span class="k">for</span> <span class="n">j</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="nb">len</span><span class="p">(</span><span class="n">src</span><span class="p">),</span> <span class="n">chunk_len</span><span class="p">)]</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-17'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-17'>#</a>
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</div>
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<p>Retrieve nearest neighbors </p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">83</span> <span class="n">neighbor_offsets</span> <span class="o">=</span> <span class="n">index</span><span class="p">(</span><span class="n">chunks</span><span class="p">,</span> <span class="n">chunk_offsets</span><span class="p">)</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-18'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-18'>#</a>
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</div>
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<p>Get neighbor texts. The neighbor length is twice the <code class="highlight"><span></span><span class="n">chunk_len</span></code>
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</p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">86</span> <span class="n">neighbors</span> <span class="o">=</span> <span class="p">[[</span><span class="n">text</span><span class="p">[</span><span class="n">j</span><span class="p">:</span> <span class="n">j</span> <span class="o">+</span> <span class="n">chunk_len</span> <span class="o">*</span> <span class="mi">2</span><span class="p">]</span> <span class="k">for</span> <span class="n">j</span> <span class="ow">in</span> <span class="n">n_off</span><span class="p">]</span> <span class="k">for</span> <span class="n">n_off</span> <span class="ow">in</span> <span class="n">neighbor_offsets</span><span class="p">]</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-19'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-19'>#</a>
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</div>
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<p>Add to list of samples </p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">89</span> <span class="n">samples</span><span class="o">.</span><span class="n">append</span><span class="p">((</span><span class="n">sample</span><span class="p">[:</span><span class="o">-</span><span class="mi">1</span><span class="p">],</span> <span class="n">sample</span><span class="p">[</span><span class="mi">1</span><span class="p">:],</span> <span class="n">neighbors</span><span class="p">))</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-20'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-20'>#</a>
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</div>
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<p>Save the samples in JSON. We don't need to use complex dataset storage mechanisms or pre-tokenize since our dataset is small. </p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">94</span> <span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="nb">str</span><span class="p">(</span><span class="n">lab</span><span class="o">.</span><span class="n">get_data_path</span><span class="p">()</span> <span class="o">/</span> <span class="s1">'retro_train_dataset.json'</span><span class="p">),</span> <span class="s1">'w'</span><span class="p">)</span> <span class="k">as</span> <span class="n">f</span><span class="p">:</span>
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<span class="lineno">95</span> <span class="n">f</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">json</span><span class="o">.</span><span class="n">dumps</span><span class="p">(</span><span class="n">samples</span><span class="p">))</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-21'>
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<div class='docs doc-strings'>
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<div class='section-link'>
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<a href='#section-21'>#</a>
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</div>
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<h2>Dataset</h2>
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<p>This is the PyTorch dataset that loads the dataset created by <code class="highlight"><span></span><span class="n">build_dataset</span></code>
|
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.</p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">98</span><span class="k">class</span> <span class="nc">Dataset</span><span class="p">(</span><span class="n">PyTorchDataset</span><span class="p">):</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-22'>
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<div class='docs doc-strings'>
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<div class='section-link'>
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<a href='#section-22'>#</a>
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</div>
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<ul><li><code class="highlight"><span></span><span class="n">file_path</span></code>
|
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is the path of the saved JSON file </li>
|
|
<li><code class="highlight"><span></span><span class="n">tds</span></code>
|
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is the <code class="highlight"><span></span><span class="n">TextDataset</span></code>
|
|
</li></ul>
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|
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</div>
|
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<div class='code'>
|
|
<div class="highlight"><pre><span class="lineno">105</span> <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">file_path</span><span class="p">:</span> <span class="n">Path</span><span class="p">,</span> <span class="n">tds</span><span class="p">:</span> <span class="n">TextDataset</span><span class="p">):</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-23'>
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<div class='docs'>
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<div class='section-link'>
|
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<a href='#section-23'>#</a>
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</div>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">111</span> <span class="bp">self</span><span class="o">.</span><span class="n">tds</span> <span class="o">=</span> <span class="n">tds</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-24'>
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<div class='docs'>
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<div class='section-link'>
|
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<a href='#section-24'>#</a>
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</div>
|
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<p>Load the samples </p>
|
|
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</div>
|
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">113</span> <span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="nb">str</span><span class="p">(</span><span class="n">file_path</span><span class="p">),</span> <span class="s1">'r'</span><span class="p">)</span> <span class="k">as</span> <span class="n">f</span><span class="p">:</span>
|
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<span class="lineno">114</span> <span class="bp">self</span><span class="o">.</span><span class="n">samples</span> <span class="o">=</span> <span class="n">json</span><span class="o">.</span><span class="n">loads</span><span class="p">(</span><span class="n">f</span><span class="o">.</span><span class="n">read</span><span class="p">())</span></pre></div>
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</div>
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</div>
|
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<div class='section' id='section-25'>
|
|
<div class='docs doc-strings'>
|
|
<div class='section-link'>
|
|
<a href='#section-25'>#</a>
|
|
</div>
|
|
<p> Number of samples</p>
|
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</div>
|
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<div class='code'>
|
|
<div class="highlight"><pre><span class="lineno">116</span> <span class="k">def</span> <span class="fm">__len__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span></pre></div>
|
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</div>
|
|
</div>
|
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<div class='section' id='section-26'>
|
|
<div class='docs'>
|
|
<div class='section-link'>
|
|
<a href='#section-26'>#</a>
|
|
</div>
|
|
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|
</div>
|
|
<div class='code'>
|
|
<div class="highlight"><pre><span class="lineno">120</span> <span class="k">return</span> <span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">samples</span><span class="p">)</span></pre></div>
|
|
</div>
|
|
</div>
|
|
<div class='section' id='section-27'>
|
|
<div class='docs doc-strings'>
|
|
<div class='section-link'>
|
|
<a href='#section-27'>#</a>
|
|
</div>
|
|
<p> Get a sample</p>
|
|
|
|
</div>
|
|
<div class='code'>
|
|
<div class="highlight"><pre><span class="lineno">122</span> <span class="k">def</span> <span class="fm">__getitem__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">idx</span><span class="p">:</span> <span class="nb">int</span><span class="p">):</span></pre></div>
|
|
</div>
|
|
</div>
|
|
<div class='section' id='section-28'>
|
|
<div class='docs'>
|
|
<div class='section-link'>
|
|
<a href='#section-28'>#</a>
|
|
</div>
|
|
<p>Get the sample </p>
|
|
|
|
</div>
|
|
<div class='code'>
|
|
<div class="highlight"><pre><span class="lineno">127</span> <span class="n">s</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">samples</span><span class="p">[</span><span class="n">idx</span><span class="p">]</span></pre></div>
|
|
</div>
|
|
</div>
|
|
<div class='section' id='section-29'>
|
|
<div class='docs'>
|
|
<div class='section-link'>
|
|
<a href='#section-29'>#</a>
|
|
</div>
|
|
<p>Tokenize </p>
|
|
|
|
</div>
|
|
<div class='code'>
|
|
<div class="highlight"><pre><span class="lineno">129</span> <span class="n">src</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">tds</span><span class="o">.</span><span class="n">text_to_i</span><span class="p">(</span><span class="n">s</span><span class="p">[</span><span class="mi">0</span><span class="p">])</span>
|
|
<span class="lineno">130</span> <span class="n">tgt</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">tds</span><span class="o">.</span><span class="n">text_to_i</span><span class="p">(</span><span class="n">s</span><span class="p">[</span><span class="mi">1</span><span class="p">])</span>
|
|
<span class="lineno">131</span> <span class="n">neighbors</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">stack</span><span class="p">([</span><span class="n">torch</span><span class="o">.</span><span class="n">stack</span><span class="p">([</span><span class="bp">self</span><span class="o">.</span><span class="n">tds</span><span class="o">.</span><span class="n">text_to_i</span><span class="p">(</span><span class="n">n</span><span class="p">)</span> <span class="k">for</span> <span class="n">n</span> <span class="ow">in</span> <span class="n">chunks</span><span class="p">])</span> <span class="k">for</span> <span class="n">chunks</span> <span class="ow">in</span> <span class="n">s</span><span class="p">[</span><span class="mi">2</span><span class="p">]])</span></pre></div>
|
|
</div>
|
|
</div>
|
|
<div class='section' id='section-30'>
|
|
<div class='docs'>
|
|
<div class='section-link'>
|
|
<a href='#section-30'>#</a>
|
|
</div>
|
|
<p> </p>
|
|
|
|
</div>
|
|
<div class='code'>
|
|
<div class="highlight"><pre><span class="lineno">133</span> <span class="k">return</span> <span class="n">src</span><span class="p">,</span> <span class="n">tgt</span><span class="p">,</span> <span class="n">neighbors</span></pre></div>
|
|
</div>
|
|
</div>
|
|
<div class='section' id='section-31'>
|
|
<div class='docs'>
|
|
<div class='section-link'>
|
|
<a href='#section-31'>#</a>
|
|
</div>
|
|
<p> </p>
|
|
|
|
</div>
|
|
<div class='code'>
|
|
<div class="highlight"><pre><span class="lineno">136</span><span class="k">if</span> <span class="vm">__name__</span> <span class="o">==</span> <span class="s1">'__main__'</span><span class="p">:</span>
|
|
<span class="lineno">137</span> <span class="n">build_dataset</span><span class="p">()</span></pre></div>
|
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