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<h1 id="behavioral-features-introduction">Behavioral Features Introduction<a class="headerlink" href="#behavioral-features-introduction" title="Permanent link">&para;</a></h1>
<p>A behavioral feature is a metric computed from raw sensor data quantifying the behavior of a participant. For example, the time spent at home computed based on location data. These are also known as digital biomarkers. </p>
<p>RAPIDS&rsquo; <code>config.yaml</code> has a section for each supported device/sensor (e.g., <code>PHONE_ACCELEROMETER</code>, <code>FITBIT_STEPS</code>, <code>EMPATICA_HEARTRATE</code>). These sections follow a similar structure, and they can have one or more feature <code>PROVIDERS</code>, that compute one or more behavioral features. You will modify the parameters of these <code>PROVIDERS</code> to obtain features from different mobile sensors. We&rsquo;ll use <code>PHONE_ACCELEROMETER</code> as an example to explain this further.</p>
<div class="admonition hint">
<p class="admonition-title">Hint</p>
<ul>
<li>We recommend reading this page if you are using RAPIDS for the first time</li>
<li>All computed sensor features are stored under <code>/data/processed/features</code> on files per sensor, per participant and per study (all participants).</li>
<li>Every time you change any sensor parameters, provider parameters or provider features, all the necessary files will be updated as soon as you execute RAPIDS.</li>
<li>In short, to extract features offered by a provider, you need to set its <code>[COMPUTE]</code> flag to <code>TRUE</code>, configure any of its parameters, and <a href="../../setup/execution">execute</a> RAPIDS.</li>
</ul>
</div>
<h3 id="explaining-the-configyaml-sensor-sections-with-an-example">Explaining the config.yaml sensor sections with an example<a class="headerlink" href="#explaining-the-configyaml-sensor-sections-with-an-example" title="Permanent link">&para;</a></h3>
<p>Each sensor section follows the same structure. Click on the numbered markers to know more.</p>
<div class="annotate highlight"><pre><span></span><code><span class="nt">PHONE_ACCELEROMETER</span><span class="p">:</span> <span class="c1"># (1)</span>
<span class="nt">CONTAINER</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">accelerometer</span> <span class="c1"># (2)</span>
<span class="nt">PROVIDERS</span><span class="p">:</span> <span class="c1"># (3)</span>
<span class="nt">RAPIDS</span><span class="p">:</span>
<span class="nt">COMPUTE</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">False</span> <span class="c1"># (4)</span>
<span class="nt">FEATURES</span><span class="p">:</span> <span class="p p-Indicator">[</span><span class="s">&quot;maxmagnitude&quot;</span><span class="p p-Indicator">,</span> <span class="s">&quot;minmagnitude&quot;</span><span class="p p-Indicator">,</span> <span class="s">&quot;avgmagnitude&quot;</span><span class="p p-Indicator">,</span> <span class="s">&quot;medianmagnitude&quot;</span><span class="p p-Indicator">,</span> <span class="s">&quot;stdmagnitude&quot;</span><span class="p p-Indicator">]</span>
<span class="nt">SRC_SCRIPT</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">src/features/phone_accelerometer/rapids/main.py</span>
<span class="nt">PANDA</span><span class="p">:</span>
<span class="nt">COMPUTE</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">False</span>
<span class="nt">VALID_SENSED_MINUTES</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">False</span>
<span class="nt">FEATURES</span><span class="p">:</span> <span class="c1"># (5)</span>
<span class="nt">exertional_activity_episode</span><span class="p">:</span> <span class="p p-Indicator">[</span><span class="s">&quot;sumduration&quot;</span><span class="p p-Indicator">,</span> <span class="s">&quot;maxduration&quot;</span><span class="p p-Indicator">,</span> <span class="s">&quot;minduration&quot;</span><span class="p p-Indicator">,</span> <span class="s">&quot;avgduration&quot;</span><span class="p p-Indicator">,</span> <span class="s">&quot;medianduration&quot;</span><span class="p p-Indicator">,</span> <span class="s">&quot;stdduration&quot;</span><span class="p p-Indicator">]</span>
<span class="nt">nonexertional_activity_episode</span><span class="p">:</span> <span class="p p-Indicator">[</span><span class="s">&quot;sumduration&quot;</span><span class="p p-Indicator">,</span> <span class="s">&quot;maxduration&quot;</span><span class="p p-Indicator">,</span> <span class="s">&quot;minduration&quot;</span><span class="p p-Indicator">,</span> <span class="s">&quot;avgduration&quot;</span><span class="p p-Indicator">,</span> <span class="s">&quot;medianduration&quot;</span><span class="p p-Indicator">,</span> <span class="s">&quot;stdduration&quot;</span><span class="p p-Indicator">]</span>
<span class="c1"># (6)</span>
<span class="nt">SRC_SCRIPT</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">src/features/phone_accelerometer/panda/main.py</span>
</code></pre></div>
<ol>
<li>
<p><strong>Sensor section</strong></p>
<p>Each sensor (accelerometer, screen, etc.) of every supported device (smartphone, Fitbit, etc.) has a section in the <code>config.yaml</code> with <code>parameters</code> and feature <code>PROVIDERS</code>.</p>
</li>
<li>
<p><strong>Sensor Parameters.</strong> </p>
<p>Each sensor section has one or more parameters. These are parameters that affect different aspects of how the raw data is pulled, and processed.</p>
<p>The <code>CONTAINER</code> parameter exists for every sensor, but some sensors will have extra parameters like <a href="../phone-locations/"><code>[PHONE_LOCATIONS]</code></a>.</p>
<p>We explain these parameters in a table at the top of each sensor documentation page.</p>
</li>
<li>
<p><strong>Sensor Providers</strong></p>
<p>Each object in this list represents a feature <code>PROVIDER</code>. Each sensor can have zero, one, or more providers.</p>
<p>A <code>PROVIDER</code> is a script that creates behavioral features for a specific sensor. Providers are created by the core RAPIDS team or by the community, which are named after its first author like <a href="../../features/phone-locations/#doryab-provider">[PHONE_LOCATIONS][DORYAB]</a>.</p>
<p>In this example, there are two accelerometer feature providers <code>RAPIDS</code> and <code>PANDA</code>.</p>
</li>
<li>
<p><strong><code>PROVIDER</code> Parameters</strong></p>
<p>Each <code>PROVIDER</code> has parameters that affect the computation of the behavioral features it offers.</p>
<p>These parameters include at least a <code>[COMPUTE]</code> flag that you switch to <code>True</code> to extract a provider&rsquo;s behavioral features. </p>
<p>We explain every provider&rsquo;s parameter in a table under the <code>Parameters description</code> heading on each provider documentation page.</p>
</li>
<li>
<p><strong><code>PROVIDER</code> Features</strong></p>
<p>Each <code>PROVIDER</code> offers a set of behavioral features.</p>
<p>These features are grouped in an array for some providers, like those for <code>RAPIDS</code> provider. For others, they are grouped in a collection of arrays, like those for <code>PANDAS</code> provider.</p>
<p>In either case, you can delete the features you are not interested in, and they will not be included in the sensor&rsquo;s output feature file. </p>
<p>We explain each behavioral feature in a table under the <code>Features description</code> heading on each provider documentation page.</p>
</li>
<li>
<p><strong><code>PROVIDER</code> script</strong></p>
<p>Each <code>PROVIDER</code> has a <code>SRC_SCRIPT</code> that points to the script implementing its behavioral features.</p>
<p>It has to be a relative path from RAPIDS&rsquo; root folder and the script&rsquo;s parent folder should be named after the provider, e.g. <code>panda</code>.</p>
</li>
</ol>
<p>These are the descriptions of each marker for accessibility:</p>
<ol>
<li>
<p><strong>Sensor section</strong></p>
<p>Each sensor (accelerometer, screen, etc.) of every supported device (smartphone, Fitbit, etc.) has a section in the <code>config.yaml</code> with <code>parameters</code> and feature <code>PROVIDERS</code>.</p>
</li>
<li>
<p><strong>Sensor Parameters.</strong> </p>
<p>Each sensor section has one or more parameters. These are parameters that affect different aspects of how the raw data is pulled, and processed.</p>
<p>The <code>CONTAINER</code> parameter exists for every sensor, but some sensors will have extra parameters like <a href="../phone-locations/"><code>[PHONE_LOCATIONS]</code></a>.</p>
<p>We explain these parameters in a table at the top of each sensor documentation page.</p>
</li>
<li>
<p><strong>Sensor Providers</strong></p>
<p>Each object in this list represents a feature <code>PROVIDER</code>. Each sensor can have zero, one, or more providers.</p>
<p>A <code>PROVIDER</code> is a script that creates behavioral features for a specific sensor. Providers are created by the core RAPIDS team or by the community, which are named after its first author like <a href="../../features/phone-locations/#doryab-provider">[PHONE_LOCATIONS][DORYAB]</a>.</p>
<p>In this example, there are two accelerometer feature providers <code>RAPIDS</code> and <code>PANDA</code>.</p>
</li>
<li>
<p><strong><code>PROVIDER</code> Parameters</strong></p>
<p>Each <code>PROVIDER</code> has parameters that affect the computation of the behavioral features it offers.</p>
<p>These parameters include at least a <code>[COMPUTE]</code> flag that you switch to <code>True</code> to extract a provider&rsquo;s behavioral features. </p>
<p>We explain every provider&rsquo;s parameter in a table under the <code>Parameters description</code> heading on each provider documentation page.</p>
</li>
<li>
<p><strong><code>PROVIDER</code> Features</strong></p>
<p>Each <code>PROVIDER</code> offers a set of behavioral features.</p>
<p>These features are grouped in an array for some providers, like those for <code>RAPIDS</code> provider. For others, they are grouped in a collection of arrays, like those for <code>PANDAS</code> provider.</p>
<p>In either case, you can delete the features you are not interested in, and they will not be included in the sensor&rsquo;s output feature file. </p>
<p>We explain each behavioral feature in a table under the <code>Features description</code> heading on each provider documentation page.</p>
</li>
<li>
<p><strong><code>PROVIDER</code> script</strong></p>
<p>Each <code>PROVIDER</code> has a <code>SRC_SCRIPT</code> that points to the script implementing its behavioral features.</p>
<p>It has to be a relative path from RAPIDS&rsquo; root folder and the script&rsquo;s parent folder should be named after the provider, e.g. <code>panda</code>.</p>
</li>
</ol>
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