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<h1 id="how-to-create-a-greatai-service">How to create a GreatAI service<a class="headerlink" href="#how-to-create-a-greatai-service" title="Permanent link">#</a></h1>
<p>The core value of <code>great-ai</code> lies in its <a class="autorefs autorefs-internal" href="../../reference/#great_ai.GreatAI">GreatAI</a> class. In order to take advantage of it, you need to create an instance wrapping your code.</p>
<p>Let's say that you have the following greeter function:</p>
<div class="highlight"><span class="filename">greeter.py</span><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="k">def</span> <span class="nf">my_greeter_function</span><span class="p">(</span><span class="n">your_name</span><span class="p">):</span>
<a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a> <span class="k">return</span> <span class="sa">f</span><span class="s1">&#39;Hi </span><span class="si">{</span><span class="n">your_name</span><span class="si">}</span><span class="s1">!&#39;</span>
</code></pre></div>
<p>You can simply decorate (wrap) this function using the <a class="autorefs autorefs-internal" href="../../reference/#great_ai.deploy.great_ai.GreatAI.create">@GreatAI.create</a> factory.</p>
<div class="highlight"><span class="filename">greeter.py</span><pre><span></span><code><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="kn">from</span> <span class="nn">great_ai</span> <span class="kn">import</span> <span class="n">GreatAI</span>
<a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a>
<a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a><span class="nd">@GreatAI</span><span class="o">.</span><span class="n">create</span>
<a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a><span class="k">def</span> <span class="nf">greeter</span><span class="p">(</span><span class="n">your_name</span><span class="p">):</span>
<a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a> <span class="k">return</span> <span class="sa">f</span><span class="s1">&#39;Hi </span><span class="si">{</span><span class="n">your_name</span><span class="si">}</span><span class="s1">!&#39;</span>
</code></pre></div>
<details class="info">
<summary>Why not simply use <code>@GreatAI?</code></summary>
<p>The purpose of <a class="autorefs autorefs-internal" href="../../reference/#great_ai.deploy.great_ai.GreatAI.create">@GreatAI.create</a> is simply to provide you with type-checking through MyPy, Pylance, and similar libraries. However, the overloading support for <code>__new__</code> is lacking in MyPy, thus, a static factory method is used instead.</p>
</details>
<h2 id="with-types">With types<a class="headerlink" href="#with-types" title="Permanent link">#</a></h2>
<p>Even though it's not required by GreatAI, <a href="https://realpython.com/python-type-checking/" target="_blank">type annotating your codebase</a> can save you from lots of trivial mistakes, that's why it's highly advised. Simply add the expected types to your function's signature.</p>
<div class="highlight"><span class="filename">type_safe_greeter.py</span><pre><span></span><code><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a><span class="kn">from</span> <span class="nn">great_ai</span> <span class="kn">import</span> <span class="n">GreatAI</span>
<a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a>
<a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a><span class="nd">@GreatAI</span><span class="o">.</span><span class="n">create</span>
<a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a><span class="k">def</span> <span class="nf">type_safe_greeter</span><span class="p">(</span><span class="n">your_name</span><span class="p">:</span> <span class="nb">str</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">str</span><span class="p">:</span>
<a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a> <span class="k">return</span> <span class="sa">f</span><span class="s1">&#39;Hi </span><span class="si">{</span><span class="n">your_name</span><span class="si">}</span><span class="s1">!&#39;</span>
</code></pre></div>
<p>This not only allows you to statically typecheck your code, but by default, GreatAI will check it during runtime as well using <a href="https://github.com/agronholm/typeguard" target="_blank">typeguard</a>.</p>
<h2 id="with-async">With async<a class="headerlink" href="#with-async" title="Permanent link">#</a></h2>
<p>Asynchronous code can result in immense performance gains in certain cases. For example, you might rely on a third-party service, do database access, or <a href="/how-to-guides/call-remote">call a remote GreatAI instance</a>. In these cases, you can simply make your function <code>async</code> without any other changes.</p>
<div class="highlight"><span class="filename">async_greeter.py</span><pre><span></span><code><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a><span class="kn">from</span> <span class="nn">great_ai</span> <span class="kn">import</span> <span class="n">GreatAI</span>
<a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a><span class="kn">from</span> <span class="nn">asyncio</span> <span class="kn">import</span> <span class="n">sleep</span>
<a id="__codelineno-3-3" name="__codelineno-3-3" href="#__codelineno-3-3"></a>
<a id="__codelineno-3-4" name="__codelineno-3-4" href="#__codelineno-3-4"></a><span class="nd">@GreatAI</span><span class="o">.</span><span class="n">create</span>
<a id="__codelineno-3-5" name="__codelineno-3-5" href="#__codelineno-3-5"></a><span class="k">async</span> <span class="k">def</span> <span class="nf">async_greeter</span><span class="p">(</span><span class="n">your_name</span><span class="p">:</span> <span class="nb">str</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">str</span><span class="p">:</span>
<a id="__codelineno-3-6" name="__codelineno-3-6" href="#__codelineno-3-6"></a> <span class="k">await</span> <span class="n">sleep</span><span class="p">(</span><span class="mi">2</span><span class="p">)</span> <span class="c1"># simulate IO-bound operation</span>
<a id="__codelineno-3-7" name="__codelineno-3-7" href="#__codelineno-3-7"></a> <span class="k">return</span> <span class="sa">f</span><span class="s1">&#39;Hi </span><span class="si">{</span><span class="n">your_name</span><span class="si">}</span><span class="s1">!&#39;</span>
</code></pre></div>
<h2 id="with-decorators">With decorators<a class="headerlink" href="#with-decorators" title="Permanent link">#</a></h2>
<p>GreatAI can decorate already decorated functions. The only restriction is that <a class="autorefs autorefs-internal" href="../../reference/#great_ai.deploy.great_ai.GreatAI.create">@GreatAI.create</a> must come last. There are two built-in decorators that you can use to customise your function but you can you use any third-party decorator as well.</p>
<h3 id="using-use_model">Using <code>@use_model</code><a class="headerlink" href="#using-use_model" title="Permanent link">#</a></h3>
<p>If you have previously saved a model with <a class="autorefs autorefs-internal" href="../../reference/#great_ai.save_model">save_model</a>, you can inject it into your function by calling <a class="autorefs autorefs-internal" href="../../reference/#great_ai.use_model">@use_model</a>.</p>
<div class="highlight"><span class="filename">greeter_with_model.py</span><pre><span></span><code><a id="__codelineno-4-1" name="__codelineno-4-1" href="#__codelineno-4-1"></a><span class="kn">from</span> <span class="nn">great_ai</span> <span class="kn">import</span> <span class="n">GreatAI</span><span class="p">,</span> <span class="n">use_model</span>
<a id="__codelineno-4-2" name="__codelineno-4-2" href="#__codelineno-4-2"></a>
<a id="__codelineno-4-3" name="__codelineno-4-3" href="#__codelineno-4-3"></a><span class="nd">@GreatAI</span><span class="o">.</span><span class="n">create</span>
<a id="__codelineno-4-4" name="__codelineno-4-4" href="#__codelineno-4-4"></a><span class="nd">@use_model</span><span class="p">(</span><span class="s1">&#39;name_of_my_model&#39;</span><span class="p">,</span> <span class="n">version</span><span class="o">=</span><span class="s1">&#39;latest&#39;</span><span class="p">)</span> <span class="c1">#(1)</span>
<a id="__codelineno-4-5" name="__codelineno-4-5" href="#__codelineno-4-5"></a><span class="k">def</span> <span class="nf">type_safe_greeter</span><span class="p">(</span><span class="n">your_name</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span> <span class="n">model</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">str</span><span class="p">:</span>
<a id="__codelineno-4-6" name="__codelineno-4-6" href="#__codelineno-4-6"></a> <span class="k">return</span> <span class="sa">f</span><span class="s1">&#39;Hi </span><span class="si">{</span><span class="n">your_name</span><span class="si">}</span><span class="s1">!&#39;</span>
<a id="__codelineno-4-7" name="__codelineno-4-7" href="#__codelineno-4-7"></a>
<a id="__codelineno-4-8" name="__codelineno-4-8" href="#__codelineno-4-8"></a><span class="k">assert</span> <span class="n">type_safe_greeter</span><span class="p">(</span><span class="s1">&#39;Andras&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">output</span> <span class="o">==</span> <span class="s1">&#39;Hi Andras&#39;</span>
</code></pre></div>
<ol>
<li>By default, the parameter named <code>model</code> will be replaced by the loaded model. This behaviour can be customised by setting the <code>model_kwarg_name</code>. This way, even multiple models can be injected into a single function.</li>
</ol>
<div class="admonition important">
<p class="admonition-title">Important</p>
<p>You must call <a class="autorefs autorefs-internal" href="../../reference/#great_ai.use_model">@use_model</a> before <a class="autorefs autorefs-internal" href="../../reference/#great_ai.deploy.great_ai.GreatAI.create">@GreatAI.create</a>. Note, that decorators are applied starting from the bottom-most one. Feel free to use <a class="autorefs autorefs-internal" href="../../reference/#great_ai.use_model">@use_model</a> in other places of the codebase, it works equally well outside of GreatAI services. </p>
</div>
<h3 id="using-parameter">Using <code>@parameter</code><a class="headerlink" href="#using-parameter" title="Permanent link">#</a></h3>
<p>If you wish to turn off logging or specify custom validation for your parameters, you can use the <a class="autorefs autorefs-internal" href="../../reference/#great_ai.parameter">@parameter</a> decorator.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>By default, all parameters that are not affected by an explicit <a class="autorefs autorefs-internal" href="../../reference/#great_ai.parameter">@parameter</a> or <a class="autorefs autorefs-internal" href="../../reference/#great_ai.use_model">@use_model</a> are automatically decorated with <a class="autorefs autorefs-internal" href="../../reference/#great_ai.parameter">@parameter</a> when <a class="autorefs autorefs-internal" href="../../reference/#great_ai.deploy.great_ai.GreatAI.create">@GreatAI.create</a> is called.</p>
</div>
<div class="highlight"><span class="filename">greeter_with_validation.py</span><pre><span></span><code><a id="__codelineno-5-1" name="__codelineno-5-1" href="#__codelineno-5-1"></a><span class="kn">from</span> <span class="nn">great_ai</span> <span class="kn">import</span> <span class="n">GreatAI</span><span class="p">,</span> <span class="n">use_model</span>
<a id="__codelineno-5-2" name="__codelineno-5-2" href="#__codelineno-5-2"></a>
<a id="__codelineno-5-3" name="__codelineno-5-3" href="#__codelineno-5-3"></a><span class="nd">@GreatAI</span><span class="o">.</span><span class="n">create</span>
<a id="__codelineno-5-4" name="__codelineno-5-4" href="#__codelineno-5-4"></a><span class="nd">@parameter</span><span class="p">(</span><span class="s1">&#39;your_name&#39;</span><span class="p">,</span> <span class="n">disable_logging</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
<a id="__codelineno-5-5" name="__codelineno-5-5" href="#__codelineno-5-5"></a><span class="k">def</span> <span class="nf">type_safe_greeter</span><span class="p">(</span><span class="n">your_name</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span> <span class="n">model</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">str</span><span class="p">:</span>
<a id="__codelineno-5-6" name="__codelineno-5-6" href="#__codelineno-5-6"></a> <span class="k">return</span> <span class="sa">f</span><span class="s1">&#39;Hi </span><span class="si">{</span><span class="n">your_name</span><span class="si">}</span><span class="s1">!&#39;</span>
<a id="__codelineno-5-7" name="__codelineno-5-7" href="#__codelineno-5-7"></a>
<a id="__codelineno-5-8" name="__codelineno-5-8" href="#__codelineno-5-8"></a><span class="k">assert</span> <span class="n">type_safe_greeter</span><span class="p">(</span><span class="s1">&#39;Andras&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">output</span> <span class="o">==</span> <span class="s1">&#39;Hi Andras&#39;</span>
</code></pre></div>
<div class="admonition important">
<p class="admonition-title">Important</p>
<p>You must call <a class="autorefs autorefs-internal" href="../../reference/#great_ai.parameter">@parameter</a> before <a class="autorefs autorefs-internal" href="../../reference/#great_ai.deploy.great_ai.GreatAI.create">@GreatAI.create</a>. Note, that decorators are applied starting from the bottom-most one. Feel free to use <a class="autorefs autorefs-internal" href="../../reference/#great_ai.parameter">@parameter</a> in other places of the codebase, it works equally well outside of GreatAI services. </p>
</div>
<h2 id="complex-example">Complex example<a class="headerlink" href="#complex-example" title="Permanent link">#</a></h2>
<p>Refer to the following example summarising the options you have when instantiating a GreatAI service.</p>
<div class="highlight"><span class="filename">complex.py</span><pre><span></span><code><a id="__codelineno-6-1" name="__codelineno-6-1" href="#__codelineno-6-1"></a><span class="kn">from</span> <span class="nn">great_ai</span> <span class="kn">import</span> <span class="n">save_model</span><span class="p">,</span> <span class="n">GreatAI</span><span class="p">,</span> <span class="n">parameter</span><span class="p">,</span> <span class="n">use_model</span><span class="p">,</span> <span class="n">log_metric</span>
<a id="__codelineno-6-2" name="__codelineno-6-2" href="#__codelineno-6-2"></a>
<a id="__codelineno-6-3" name="__codelineno-6-3" href="#__codelineno-6-3"></a><span class="n">save_model</span><span class="p">(</span><span class="mi">4</span><span class="p">,</span> <span class="s1">&#39;secret-number&#39;</span><span class="p">)</span> <span class="c1">#(1)</span>
<a id="__codelineno-6-4" name="__codelineno-6-4" href="#__codelineno-6-4"></a>
<a id="__codelineno-6-5" name="__codelineno-6-5" href="#__codelineno-6-5"></a><span class="nd">@GreatAI</span><span class="o">.</span><span class="n">create</span>
<a id="__codelineno-6-6" name="__codelineno-6-6" href="#__codelineno-6-6"></a><span class="nd">@parameter</span><span class="p">(</span><span class="s1">&#39;positive_number&#39;</span><span class="p">,</span> <span class="n">validate</span><span class="o">=</span><span class="k">lambda</span> <span class="n">n</span><span class="p">:</span> <span class="n">n</span> <span class="o">&gt;</span> <span class="mi">0</span><span class="p">,</span> <span class="n">disable_logging</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
<a id="__codelineno-6-7" name="__codelineno-6-7" href="#__codelineno-6-7"></a><span class="nd">@use_model</span><span class="p">(</span><span class="s1">&#39;secret-number&#39;</span><span class="p">,</span> <span class="n">version</span><span class="o">=</span><span class="s1">&#39;latest&#39;</span><span class="p">,</span> <span class="n">model_kwarg_name</span><span class="o">=</span><span class="s1">&#39;secret&#39;</span><span class="p">)</span>
<a id="__codelineno-6-8" name="__codelineno-6-8" href="#__codelineno-6-8"></a><span class="k">def</span> <span class="nf">add_number</span><span class="p">(</span><span class="n">positive_number</span><span class="p">:</span> <span class="nb">int</span><span class="p">,</span> <span class="n">secret</span><span class="p">:</span> <span class="nb">int</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">int</span><span class="p">:</span>
<a id="__codelineno-6-9" name="__codelineno-6-9" href="#__codelineno-6-9"></a> <span class="n">log_metric</span><span class="p">(</span>
<a id="__codelineno-6-10" name="__codelineno-6-10" href="#__codelineno-6-10"></a> <span class="s1">&#39;log directly into the returned Trace&#39;</span><span class="p">,</span>
<a id="__codelineno-6-11" name="__codelineno-6-11" href="#__codelineno-6-11"></a> <span class="n">positive_number</span> <span class="o">*</span> <span class="mi">2</span>
<a id="__codelineno-6-12" name="__codelineno-6-12" href="#__codelineno-6-12"></a> <span class="p">)</span>
<a id="__codelineno-6-13" name="__codelineno-6-13" href="#__codelineno-6-13"></a> <span class="k">return</span> <span class="n">positive_number</span> <span class="o">+</span> <span class="n">secret</span>
<a id="__codelineno-6-14" name="__codelineno-6-14" href="#__codelineno-6-14"></a>
<a id="__codelineno-6-15" name="__codelineno-6-15" href="#__codelineno-6-15"></a><span class="k">assert</span> <span class="n">add_number</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span><span class="o">.</span><span class="n">output</span> <span class="o">==</span> <span class="mi">5</span>
</code></pre></div>
<ol>
<li>Refer to <a href="/how-to-guides/configure-service">the configuration page</a> for specifying where to store your models. </li>
</ol>
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