><span class="o">.</span><span class="n">learn_label_encoding</span><span class="p">(</span><span class="n">tokenized_dataset</span><span class="p">)</span>

    <span class="n">padded_dataset</span> <span class="o">=</span> <span class="n">smiles_utils</span><span class="o">.</span><span class="n">pad_sequences</span><span class="p">(</span>
        <span class="n">tokenized_dataset</span><span class="p">,</span> <span class="n">sequence_length</span><span class="p">,</span> <span class="n">padding_value</