rs defined here can later be accessed by arm index in the following way:
<code>theta[[index_of_arm]]$parameter_name</code></p></dd>

</dl>

<dl'>
<dt><code><a href='Policy.html'>get_action(context)</a></code></dt><dd><p>here, a policy decides which arm to choose, based on the current values
of its parameters and, potentially, the current context.</p></dd>

</dl>

<dl'>
<dt><code><a href='Policy.html'>set_reward(reward, context)</a></code></dt><dd><p>in <code><a href='Policy.html'>set_reward(reward, context)