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<a class="parent" href="index.html">sampling</a>
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<a href="https://github.com/labmlai/annotated_deep_learning_paper_implementations/tree/master/labml_nn/sampling/experiment.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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<h1>Trying out Sampling Techniques for Language Models</h1>
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<ul><li><a href="greedy.html">Greedy Sampling</a> </li>
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<li><a href="temperature.html">Temperature Sampling</a> </li>
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<li><a href="top_k.html">Top-k Sampling</a> </li>
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<li><a href="nucleus.html">Nucleus Sampling</a></li></ul>
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<p>This experiment uses the above sampling techniques, on HuggingFace's GPT2 model.</p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">18</span><span></span><span class="kn">import</span> <span class="nn">torch</span>
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<span class="lineno">19</span>
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<span class="lineno">20</span><span class="kn">from</span> <span class="nn">labml</span> <span class="kn">import</span> <span class="n">monit</span><span class="p">,</span> <span class="n">logger</span><span class="p">,</span> <span class="n">lab</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.logger</span> <span class="kn">import</span> <span class="n">Text</span>
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<span class="lineno">23</span>
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<span class="lineno">24</span><span class="kn">from</span> <span class="nn">labml_nn.sampling</span> <span class="kn">import</span> <span class="n">Sampler</span>
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<span class="lineno">25</span><span class="kn">from</span> <span class="nn">labml_nn.sampling.greedy</span> <span class="kn">import</span> <span class="n">GreedySampler</span>
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<span class="lineno">26</span><span class="kn">from</span> <span class="nn">labml_nn.sampling.nucleus</span> <span class="kn">import</span> <span class="n">NucleusSampler</span>
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<span class="lineno">27</span><span class="kn">from</span> <span class="nn">labml_nn.sampling.temperature</span> <span class="kn">import</span> <span class="n">TemperatureSampler</span>
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<span class="lineno">28</span><span class="kn">from</span> <span class="nn">labml_nn.sampling.top_k</span> <span class="kn">import</span> <span class="n">TopKSampler</span>
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<span class="lineno">29</span><span class="kn">from</span> <span class="nn">transformers</span> <span class="kn">import</span> <span class="n">GPT2Tokenizer</span><span class="p">,</span> <span class="n">GPT2LMHeadModel</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>Sample from model</h2>
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<ul><li><code class="highlight"><span></span><span class="n">model</span></code>
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is the model to sample from </li>
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<li><code class="highlight"><span></span><span class="n">tokenizer</span></code>
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is the tokenizer to use </li>
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<li><code class="highlight"><span></span><span class="n">sampler</span></code>
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is the sampler to use </li>
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<li><code class="highlight"><span></span><span class="n">n_samples</span></code>
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is the number of samples to generate </li>
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<li><code class="highlight"><span></span><span class="n">n_tokens</span></code>
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is the number of tokens to generate </li>
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<li><code class="highlight"><span></span><span class="n">seq_len</span></code>
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is the maximum sequence length for the model </li>
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<li><code class="highlight"><span></span><span class="n">prompt</span></code>
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is the starting prompt</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">32</span><span class="nd">@torch</span><span class="o">.</span><span class="n">no_grad</span><span class="p">()</span>
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<span class="lineno">33</span><span class="k">def</span> <span class="nf">sample</span><span class="p">(</span><span class="n">model</span><span class="p">:</span> <span class="n">GPT2LMHeadModel</span><span class="p">,</span> <span class="n">tokenizer</span><span class="p">:</span> <span class="n">GPT2Tokenizer</span><span class="p">,</span> <span class="n">sampler</span><span class="p">:</span> <span class="n">Sampler</span><span class="p">,</span>
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<span class="lineno">34</span> <span class="n">n_samples</span><span class="p">:</span> <span class="nb">int</span><span class="p">,</span> <span class="n">n_tokens</span><span class="p">:</span> <span class="nb">int</span><span class="p">,</span> <span class="n">seq_len</span><span class="p">:</span> <span class="nb">int</span><span class="p">,</span> <span class="n">prompt</span><span class="p">:</span> <span class="nb">str</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>Tokenize the <code class="highlight"><span></span><span class="n">prompt</span></code>
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and make <code class="highlight"><span></span><span class="n">n_samples</span></code>
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copies 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">47</span> <span class="n">data</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">tile</span><span class="p">(</span><span class="n">torch</span><span class="o">.</span><span class="n">tensor</span><span class="p">(</span><span class="n">tokenizer</span><span class="o">.</span><span class="n">encode</span><span class="p">(</span><span class="n">prompt</span><span class="p">))[</span><span class="kc">None</span><span class="p">,</span> <span class="p">:],</span> <span class="p">(</span><span class="n">n_samples</span><span class="p">,</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-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>Collect output for printing </p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">50</span> <span class="n">logs</span> <span class="o">=</span> <span class="p">[[(</span><span class="n">prompt</span><span class="p">,</span> <span class="n">Text</span><span class="o">.</span><span class="n">meta</span><span class="p">)]</span> <span class="k">for</span> <span class="n">_</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="n">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-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>Sample <code class="highlight"><span></span><span class="n">n_tokens</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">52</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">'Sample'</span><span class="p">,</span> <span class="n">n_tokens</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>Truncate the data to the maximum sequence length </p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">54</span> <span class="n">data</span> <span class="o">=</span> <span class="n">data</span><span class="p">[</span><span class="o">-</span><span class="n">seq_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-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>Get the model output. The 'logits' has shape <code class="highlight"><span></span><span class="p">[</span><span class="n">batch_size</span><span class="p">,</span> <span class="n">seq_len</span><span class="p">,</span> <span class="n">n_tokens</span><span class="p">]</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">56</span> <span class="n">logits</span> <span class="o">=</span> <span class="n">model</span><span class="p">(</span><span class="n">data</span><span class="p">)[</span><span class="mi">0</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>Get the <code class="highlight"><span></span><span class="n">logits</span></code>
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of the last token </p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">58</span> <span class="n">logits</span> <span class="o">=</span> <span class="n">logits</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-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>Sample from the <code class="highlight"><span></span><span class="n">logits</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">60</span> <span class="n">res</span> <span class="o">=</span> <span class="n">sampler</span><span class="p">(</span><span class="n">logits</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-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>Add the sampled token to the data </p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">62</span> <span class="n">data</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">cat</span><span class="p">([</span><span class="n">data</span><span class="p">,</span> <span class="n">res</span><span class="p">[:,</span> <span class="kc">None</span><span class="p">]],</span> <span class="n">dim</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-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>Decode and add the sampled token for logging </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="k">for</span> <span class="n">j</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="n">n_samples</span><span class="p">):</span>
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<span class="lineno">65</span> <span class="n">logs</span><span class="p">[</span><span class="n">j</span><span class="p">]</span> <span class="o">+=</span> <span class="p">[(</span><span class="s1">''</span> <span class="o">+</span> <span class="n">tokenizer</span><span class="o">.</span><span class="n">decode</span><span class="p">(</span><span class="n">res</span><span class="p">[</span><span class="n">j</span><span class="p">]),</span> <span class="n">Text</span><span class="o">.</span><span class="n">value</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-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>Print the sampled outputs </p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">68</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="n">n_samples</span><span class="p">):</span>
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<span class="lineno">69</span> <span class="n">logger</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="n">logs</span><span class="p">[</span><span class="n">j</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 doc-strings'>
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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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<h3>Try different sampling techniques</h3>
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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">def</span> <span class="nf">main</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>Load the model and tokenizer </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="k">with</span> <span class="n">monit</span><span class="o">.</span><span class="n">section</span><span class="p">(</span><span class="s1">'Load tokenizer/model'</span><span class="p">):</span>
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<span class="lineno">79</span> <span class="n">tokenizer</span> <span class="o">=</span> <span class="n">GPT2Tokenizer</span><span class="o">.</span><span class="n">from_pretrained</span><span class="p">(</span><span class="s1">'gpt2'</span><span class="p">,</span> <span class="n">cache_dir</span><span class="o">=</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">'cache'</span><span class="p">)</span>
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<span class="lineno">80</span> <span class="n">model</span> <span class="o">=</span> <span class="n">GPT2LMHeadModel</span><span class="o">.</span><span class="n">from_pretrained</span><span class="p">(</span><span class="s1">'gpt2'</span><span class="p">,</span> <span class="n">cache_dir</span><span class="o">=</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">'cache'</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>Set the model to eval mode </p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">82</span> <span class="n">model</span><span class="o">.</span><span class="n">eval</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>Prompts to use for sampling </p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">85</span> <span class="n">prompt</span> <span class="o">=</span> <span class="s1">'I saw an interesting dream last night. '</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><a href="greedy.html">Greedy Sampling</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">88</span> <span class="k">with</span> <span class="n">monit</span><span class="o">.</span><span class="n">section</span><span class="p">(</span><span class="s1">'greedy'</span><span class="p">):</span>
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<span class="lineno">89</span> <span class="n">sample</span><span class="p">(</span><span class="n">model</span><span class="p">,</span> <span class="n">tokenizer</span><span class="p">,</span> <span class="n">GreedySampler</span><span class="p">(),</span> <span class="mi">4</span><span class="p">,</span> <span class="mi">32</span><span class="p">,</span> <span class="mi">128</span><span class="p">,</span> <span class="n">prompt</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><a href="temperature.html">Temperature Sampling</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">92</span> <span class="k">with</span> <span class="n">monit</span><span class="o">.</span><span class="n">section</span><span class="p">(</span><span class="s1">'temperature=1.'</span><span class="p">):</span>
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<span class="lineno">93</span> <span class="n">sample</span><span class="p">(</span><span class="n">model</span><span class="p">,</span> <span class="n">tokenizer</span><span class="p">,</span> <span class="n">TemperatureSampler</span><span class="p">(</span><span class="mf">1.</span><span class="p">),</span> <span class="mi">4</span><span class="p">,</span> <span class="mi">32</span><span class="p">,</span> <span class="mi">128</span><span class="p">,</span> <span class="n">prompt</span><span class="p">)</span>
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<span class="lineno">94</span> <span class="k">with</span> <span class="n">monit</span><span class="o">.</span><span class="n">section</span><span class="p">(</span><span class="s1">'temperature=.1'</span><span class="p">):</span>
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<span class="lineno">95</span> <span class="n">sample</span><span class="p">(</span><span class="n">model</span><span class="p">,</span> <span class="n">tokenizer</span><span class="p">,</span> <span class="n">TemperatureSampler</span><span class="p">(</span><span class="mf">.1</span><span class="p">),</span> <span class="mi">4</span><span class="p">,</span> <span class="mi">32</span><span class="p">,</span> <span class="mi">128</span><span class="p">,</span> <span class="n">prompt</span><span class="p">)</span>
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<span class="lineno">96</span> <span class="k">with</span> <span class="n">monit</span><span class="o">.</span><span class="n">section</span><span class="p">(</span><span class="s1">'temperature=10.'</span><span class="p">):</span>
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<span class="lineno">97</span> <span class="n">sample</span><span class="p">(</span><span class="n">model</span><span class="p">,</span> <span class="n">tokenizer</span><span class="p">,</span> <span class="n">TemperatureSampler</span><span class="p">(</span><span class="mf">10.</span><span class="p">),</span> <span class="mi">4</span><span class="p">,</span> <span class="mi">32</span><span class="p">,</span> <span class="mi">128</span><span class="p">,</span> <span class="n">prompt</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><a href="top_k.html">Top-k Sampling</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">100</span> <span class="k">with</span> <span class="n">monit</span><span class="o">.</span><span class="n">section</span><span class="p">(</span><span class="s1">'top_k=5'</span><span class="p">):</span>
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<span class="lineno">101</span> <span class="n">sample</span><span class="p">(</span><span class="n">model</span><span class="p">,</span> <span class="n">tokenizer</span><span class="p">,</span> <span class="n">TopKSampler</span><span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="n">TemperatureSampler</span><span class="p">(</span><span class="mf">1.</span><span class="p">)),</span> <span class="mi">4</span><span class="p">,</span> <span class="mi">32</span><span class="p">,</span> <span class="mi">128</span><span class="p">,</span> <span class="n">prompt</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><a href="nucleus.html">Nucleus Sampling</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">104</span> <span class="k">with</span> <span class="n">monit</span><span class="o">.</span><span class="n">section</span><span class="p">(</span><span class="s1">'nucleus p=.95'</span><span class="p">):</span>
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<span class="lineno">105</span> <span class="n">sample</span><span class="p">(</span><span class="n">model</span><span class="p">,</span> <span class="n">tokenizer</span><span class="p">,</span> <span class="n">NucleusSampler</span><span class="p">(</span><span class="mf">0.95</span><span class="p">,</span> <span class="n">TemperatureSampler</span><span class="p">(</span><span class="mf">1.</span><span class="p">)),</span> <span class="mi">4</span><span class="p">,</span> <span class="mi">32</span><span class="p">,</span> <span class="mi">128</span><span class="p">,</span> <span class="n">prompt</span><span class="p">)</span>
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<span class="lineno">106</span> <span class="k">with</span> <span class="n">monit</span><span class="o">.</span><span class="n">section</span><span class="p">(</span><span class="s1">'nucleus p=.1'</span><span class="p">):</span>
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<span class="lineno">107</span> <span class="n">sample</span><span class="p">(</span><span class="n">model</span><span class="p">,</span> <span class="n">tokenizer</span><span class="p">,</span> <span class="n">NucleusSampler</span><span class="p">(</span><span class="mf">0.1</span><span class="p">,</span> <span class="n">TemperatureSampler</span><span class="p">(</span><span class="mf">1.</span><span class="p">)),</span> <span class="mi">4</span><span class="p">,</span> <span class="mi">32</span><span class="p">,</span> <span class="mi">128</span><span class="p">,</span> <span class="n">prompt</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> </p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">110</span><span class="k">if</span> <span class="vm">__name__</span> <span class="o">==</span> <span class="s1">'__main__'</span><span class="p">:</span>
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<span class="lineno">111</span> <span class="n">main</span><span class="p">()</span></pre></div>
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