Chroma training, test, and validation sets.

<p>Column <strong>pdb</strong> contains the PDB codes for entries used in training Chroma, while column <strong>split</strong> designates whether the corresponding entry was part of the training set (value <strong>train</strong>), the test set (value <strong>test</strong>), or the validation set (value <strong>validation</strong>).</p>