lass="kn">import</span> <span class="nn">numpy</span> <span class="k">as</span> <span class="nn">np</span>
<span class="kn">import</span> <span class="nn">sparse</span> <span class="k">as</span> <span class="nn">sp</span>
<span class="kn">from</span> <span class="nn">ase</span> <span class="kn">import</span> <span class="n">Atoms</span>

<span class="kn">from</span> <span class="nn">dscribe.descriptors.descriptor</span> <span class="kn">import</span> <span class="n">Descriptor</span>
<span class="kn">from</