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<h1 id="batched-executor---rewinding-to-an-earlier-state">Batched executor - rewinding to an earlier state<a class="headerlink" href="#batched-executor---rewinding-to-an-earlier-state" title="Permanent link"></a></h1>
<div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal">  1</span>
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<span class="normal">117</span></pre></div></td><td class="code"><div><pre><span></span><code><span class="k">using</span><span class="w"> </span><span class="nn">LLama.Batched</span><span class="p">;</span>
<span class="k">using</span><span class="w"> </span><span class="nn">LLama.Common</span><span class="p">;</span>
<span class="k">using</span><span class="w"> </span><span class="nn">LLama.Native</span><span class="p">;</span>
<span class="k">using</span><span class="w"> </span><span class="nn">LLama.Sampling</span><span class="p">;</span>
<span class="k">using</span><span class="w"> </span><span class="nn">Spectre.Console</span><span class="p">;</span>

<span class="k">namespace</span><span class="w"> </span><span class="nn">LLama.Examples.Examples</span><span class="p">;</span>

<span class="c1">/// &lt;summary&gt;</span>
<span class="c1">/// This demonstrates generating tokens and then rewinding to an earlier state</span>
<span class="c1">/// &lt;/summary&gt;</span>
<span class="k">public</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">BatchedExecutorRewind</span>
<span class="p">{</span>
<span class="w">    </span><span class="k">private</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">n_generate</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="m">24</span><span class="p">;</span>
<span class="w">    </span><span class="k">private</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">n_rewind</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="m">12</span><span class="p">;</span>
<span class="w">    </span><span class="k">private</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">n_repeats</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="m">6</span><span class="p">;</span>

<span class="w">    </span><span class="k">public</span><span class="w"> </span><span class="k">static</span><span class="w"> </span><span class="k">async</span><span class="w"> </span><span class="n">Task</span><span class="w"> </span><span class="nf">Run</span><span class="p">()</span>
<span class="w">    </span><span class="p">{</span>
<span class="w">        </span><span class="kt">string</span><span class="w"> </span><span class="n">modelPath</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">UserSettings</span><span class="p">.</span><span class="n">GetModelPath</span><span class="p">();</span>

<span class="w">        </span><span class="kt">var</span><span class="w"> </span><span class="n">parameters</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">ModelParams</span><span class="p">(</span><span class="n">modelPath</span><span class="p">);</span>
<span class="w">        </span><span class="k">using</span><span class="w"> </span><span class="nn">var</span><span class="w"> </span><span class="n">model</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">LLamaWeights</span><span class="p">.</span><span class="n">LoadFromFile</span><span class="p">(</span><span class="n">parameters</span><span class="p">);</span>

<span class="w">        </span><span class="kt">var</span><span class="w"> </span><span class="n">prompt</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">AnsiConsole</span><span class="p">.</span><span class="n">Ask</span><span class="p">(</span><span class="s">&quot;Prompt (or ENTER for default):&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;Not many people know that&quot;</span><span class="p">);</span>

<span class="w">        </span><span class="c1">// Create an executor that can evaluate a batch of conversations together</span>
<span class="w">        </span><span class="k">using</span><span class="w"> </span><span class="nn">var</span><span class="w"> </span><span class="n">executor</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">BatchedExecutor</span><span class="p">(</span><span class="n">model</span><span class="p">,</span><span class="w"> </span><span class="n">parameters</span><span class="p">);</span>

<span class="w">        </span><span class="c1">// Print some info</span>
<span class="w">        </span><span class="kt">var</span><span class="w"> </span><span class="n">name</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">executor</span><span class="p">.</span><span class="n">Model</span><span class="p">.</span><span class="n">Metadata</span><span class="p">.</span><span class="n">GetValueOrDefault</span><span class="p">(</span><span class="s">&quot;general.name&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;unknown model name&quot;</span><span class="p">);</span>
<span class="w">        </span><span class="n">Console</span><span class="p">.</span><span class="n">WriteLine</span><span class="p">(</span><span class="s">$&quot;Created executor with model: {name}&quot;</span><span class="p">);</span>

<span class="w">        </span><span class="c1">// Evaluate the initial prompt to create one conversation</span>
<span class="w">        </span><span class="k">using</span><span class="w"> </span><span class="nn">var</span><span class="w"> </span><span class="n">conversation</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">executor</span><span class="p">.</span><span class="n">Create</span><span class="p">();</span>
<span class="w">        </span><span class="n">conversation</span><span class="p">.</span><span class="n">Prompt</span><span class="p">(</span><span class="n">prompt</span><span class="p">);</span>

<span class="w">        </span><span class="c1">// Create the start node wrapping the conversation</span>
<span class="w">        </span><span class="kt">var</span><span class="w"> </span><span class="n">node</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">Node</span><span class="p">(</span><span class="n">executor</span><span class="p">.</span><span class="n">Context</span><span class="p">);</span>

<span class="w">        </span><span class="c1">// Print the prompt</span>
<span class="w">        </span><span class="n">Console</span><span class="p">.</span><span class="n">ForegroundColor</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">ConsoleColor</span><span class="p">.</span><span class="n">Green</span><span class="p">;</span>
<span class="w">        </span><span class="n">Console</span><span class="p">.</span><span class="n">WriteLine</span><span class="p">(</span><span class="n">prompt</span><span class="p">);</span>

<span class="w">        </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="kt">var</span><span class="w"> </span><span class="n">i</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="m">0</span><span class="p">;</span><span class="w"> </span><span class="n">i</span><span class="w"> </span><span class="o">&lt;</span><span class="w"> </span><span class="n">n_repeats</span><span class="p">;</span><span class="w"> </span><span class="n">i</span><span class="o">++</span><span class="p">)</span>
<span class="w">        </span><span class="p">{</span>
<span class="w">            </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="kt">var</span><span class="w"> </span><span class="n">j</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="m">0</span><span class="p">;</span><span class="w"> </span><span class="n">j</span><span class="w"> </span><span class="o">&lt;</span><span class="w"> </span><span class="n">n_generate</span><span class="p">;</span><span class="w"> </span><span class="n">j</span><span class="o">++</span><span class="p">)</span>
<span class="w">            </span><span class="p">{</span>
<span class="w">                </span><span class="c1">// Run inference</span>
<span class="w">                </span><span class="k">await</span><span class="w"> </span><span class="n">executor</span><span class="p">.</span><span class="n">Infer</span><span class="p">();</span>

<span class="w">                </span><span class="c1">// Sample a token</span>
<span class="w">                </span><span class="kt">var</span><span class="w"> </span><span class="n">token</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">node</span><span class="p">.</span><span class="n">Sample</span><span class="p">(</span><span class="n">conversation</span><span class="p">);</span>

<span class="w">                </span><span class="c1">// Continue conversation with this token</span>
<span class="w">                </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">j</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="n">n_generate</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="m">1</span><span class="p">)</span>
<span class="w">                    </span><span class="n">conversation</span><span class="p">.</span><span class="n">Prompt</span><span class="p">(</span><span class="n">token</span><span class="p">);</span>
<span class="w">            </span><span class="p">}</span>

<span class="w">            </span><span class="c1">// Write out what we generated</span>
<span class="w">            </span><span class="n">node</span><span class="p">.</span><span class="n">Write</span><span class="p">(</span><span class="n">n_rewind</span><span class="p">,</span><span class="w"> </span><span class="n">i</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="m">1</span><span class="p">);</span>

<span class="w">            </span><span class="c1">// Rewind back a few tokens</span>
<span class="w">            </span><span class="n">conversation</span><span class="p">.</span><span class="n">Rewind</span><span class="p">(</span><span class="n">n_rewind</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="m">1</span><span class="p">);</span>

<span class="w">            </span><span class="c1">// Prompt with a token</span>
<span class="w">            </span><span class="n">conversation</span><span class="p">.</span><span class="n">Prompt</span><span class="p">(</span><span class="n">node</span><span class="p">.</span><span class="n">GetToken</span><span class="p">(</span><span class="n">n_generate</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="n">n_rewind</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="m">1</span><span class="p">));</span>

<span class="w">            </span><span class="c1">// Create a new node around the rewound conversation</span>
<span class="w">            </span><span class="n">node</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">Node</span><span class="p">(</span><span class="n">executor</span><span class="p">.</span><span class="n">Context</span><span class="p">);</span>
<span class="w">        </span><span class="p">}</span>

<span class="w">        </span><span class="n">Console</span><span class="p">.</span><span class="n">WriteLine</span><span class="p">(</span><span class="s">&quot;Press any key to exit demo&quot;</span><span class="p">);</span>
<span class="w">        </span><span class="n">Console</span><span class="p">.</span><span class="n">ReadKey</span><span class="p">(</span><span class="k">true</span><span class="p">);</span>
<span class="w">    </span><span class="p">}</span>

<span class="w">    </span><span class="k">private</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">Node</span>
<span class="w">    </span><span class="p">{</span>
<span class="w">        </span><span class="k">private</span><span class="w"> </span><span class="k">readonly</span><span class="w"> </span><span class="n">LLamaContext</span><span class="w"> </span><span class="n">_context</span><span class="p">;</span>

<span class="w">        </span><span class="k">private</span><span class="w"> </span><span class="k">readonly</span><span class="w"> </span><span class="n">List</span><span class="o">&lt;</span><span class="n">LLamaToken</span><span class="o">&gt;</span><span class="w"> </span><span class="n">_tokens</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">List</span><span class="o">&lt;</span><span class="n">LLamaToken</span><span class="o">&gt;</span><span class="p">();</span>
<span class="w">        </span><span class="k">private</span><span class="w"> </span><span class="k">readonly</span><span class="w"> </span><span class="n">DefaultSamplingPipeline</span><span class="w"> </span><span class="n">Sampler</span><span class="p">;</span>

<span class="w">        </span><span class="k">public</span><span class="w"> </span><span class="nf">Node</span><span class="p">(</span><span class="n">LLamaContext</span><span class="w"> </span><span class="n">context</span><span class="p">)</span>
<span class="w">        </span><span class="p">{</span>
<span class="w">            </span><span class="n">_context</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">context</span><span class="p">;</span>
<span class="w">            </span><span class="n">Sampler</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">DefaultSamplingPipeline</span><span class="p">();</span>
<span class="w">        </span><span class="p">}</span>

<span class="w">        </span><span class="k">public</span><span class="w"> </span><span class="n">LLamaToken</span><span class="w"> </span><span class="nf">Sample</span><span class="p">(</span><span class="n">Conversation</span><span class="w"> </span><span class="n">conversation</span><span class="p">)</span>
<span class="w">        </span><span class="p">{</span>
<span class="w">            </span><span class="kt">var</span><span class="w"> </span><span class="n">token</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Sampler</span><span class="p">.</span><span class="n">Sample</span><span class="p">(</span><span class="n">_context</span><span class="p">.</span><span class="n">NativeHandle</span><span class="p">,</span><span class="w"> </span><span class="n">conversation</span><span class="p">.</span><span class="n">Sample</span><span class="p">(),</span><span class="w"> </span><span class="n">Array</span><span class="p">.</span><span class="n">Empty</span><span class="o">&lt;</span><span class="n">LLamaToken</span><span class="o">&gt;</span><span class="p">());</span>
<span class="w">            </span><span class="n">_tokens</span><span class="p">.</span><span class="n">Add</span><span class="p">(</span><span class="n">token</span><span class="p">);</span>
<span class="w">            </span><span class="k">return</span><span class="w"> </span><span class="n">token</span><span class="p">;</span>
<span class="w">        </span><span class="p">}</span>

<span class="w">        </span><span class="k">public</span><span class="w"> </span><span class="k">void</span><span class="w"> </span><span class="nf">Write</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">n_rewind</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">depth</span><span class="p">)</span>
<span class="w">        </span><span class="p">{</span>
<span class="w">            </span><span class="kt">var</span><span class="w"> </span><span class="n">decoder</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">StreamingTokenDecoder</span><span class="p">(</span><span class="n">_context</span><span class="p">);</span>

<span class="w">            </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="kt">var</span><span class="w"> </span><span class="n">i</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="m">0</span><span class="p">;</span><span class="w"> </span><span class="n">i</span><span class="w"> </span><span class="o">&lt;</span><span class="w"> </span><span class="n">_tokens</span><span class="p">.</span><span class="n">Count</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="n">n_rewind</span><span class="p">;</span><span class="w"> </span><span class="n">i</span><span class="o">++</span><span class="p">)</span>
<span class="w">                </span><span class="n">decoder</span><span class="p">.</span><span class="n">Add</span><span class="p">(</span><span class="n">_tokens</span><span class="p">[</span><span class="n">i</span><span class="p">]);</span>

<span class="w">            </span><span class="n">AnsiConsole</span><span class="p">.</span><span class="n">MarkupLine</span><span class="p">(</span><span class="s">$&quot;[green]{new string(&#39; &#39;, depth * 3) + decoder.Read().ReplaceLineEndings(&quot;</span><span class="w"> </span><span class="s">&quot;)}[/]&quot;</span><span class="p">);</span>

<span class="w">            </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="kt">var</span><span class="w"> </span><span class="n">i</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">_tokens</span><span class="p">.</span><span class="n">Count</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="n">n_rewind</span><span class="p">;</span><span class="w"> </span><span class="n">i</span><span class="w"> </span><span class="o">&lt;</span><span class="w"> </span><span class="n">_tokens</span><span class="p">.</span><span class="n">Count</span><span class="p">;</span><span class="w"> </span><span class="n">i</span><span class="o">++</span><span class="p">)</span>
<span class="w">                </span><span class="n">decoder</span><span class="p">.</span><span class="n">Add</span><span class="p">(</span><span class="n">_tokens</span><span class="p">[</span><span class="n">i</span><span class="p">]);</span>

<span class="w">            </span><span class="n">AnsiConsole</span><span class="p">.</span><span class="n">MarkupLine</span><span class="p">(</span><span class="s">$&quot;[maroon]{decoder.Read().ReplaceLineEndings(&quot;</span><span class="w"> </span><span class="s">&quot;)}[/]&quot;</span><span class="p">);</span>
<span class="w">        </span><span class="p">}</span>

<span class="w">        </span><span class="k">public</span><span class="w"> </span><span class="n">LLamaToken</span><span class="w"> </span><span class="nf">GetToken</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">index</span><span class="p">)</span>
<span class="w">        </span><span class="p">{</span>
<span class="w">            </span><span class="k">return</span><span class="w"> </span><span class="n">_tokens</span><span class="p">[</span><span class="n">index</span><span class="p">];</span>
<span class="w">        </span><span class="p">}</span>
<span class="w">    </span><span class="p">}</span>
<span class="p">}</span>
</code></pre></div></td></tr></table></div>


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