Fix deprecation warnings occuring due to invalid escape sequences

class VinaModel(Model):

  def __init__(self, logdir=None, batch_size=50):

    """Vina models.

    r"""Vina models.

    .. math:: c = \sum_{i < j} f_{t_i,t_j}(r_{ij})

def generate_random__unit_vector():

  """Generate a random unit vector on the 3-sphere.

  r"""Generate a random unit vector on the 3-sphere.

  citation:

  http://mathworld.wolfram.com/SpherePointPicking.html

def generate_random_rotation_matrix():

  """Generate a random rotation matrix in 3D.

  r"""Generate a random rotation matrix in 3D.

  1. Generate a random unit vector u, randomly sampled from the unit

     3-sphere (see function generate_random__unit_vector() for details)

def test_chiral_weave():

  """Test weave features on a molecule with chiral structure."""

  mols = ["F\C=C\F"]  # noqa: W605

  mols = [r"F\C=C\F"]

  featurizer = dc.feat.WeaveFeaturizer(use_chirality=True)

  mol_list = featurizer.featurize(mols)

  mol = mol_list[0]

class GraphEmbedPoolLayer(tf.keras.layers.Layer):

  """

  r"""

  GraphCNNPool Layer from Robust Spatial Filtering with Graph Convolutional Neural Networks

  https://arxiv.org/abs/1703.00792

class GraphCNN(tf.keras.layers.Layer):

  """

  r"""

  GraphCNN Layer from Robust Spatial Filtering with Graph Convolutional Neural Networks

  https://arxiv.org/abs/1703.00792

  if save_timestamp:

    save_folder = "%s-%s-%s" % (save_folder,

                                time.strftime("%Y%m%d", time.localtime()),

                                re.search("\.(.*)", str(time.time())).group(1))

                                re.search(r"\.(.*)", str(time.time())).group(1))

  if reload:

    if not os.path.exists(save_folder):