message: avoid tensorflow addons dependency
diff: import numpy as np
  import tensorflow as tf
  -import tensorflow_addons as tfa
  from ..simplex_tree import SimplexTree
  from ..rips_complex import RipsComplex
  from ..cubical_complex import CubicalComplex
  @@ -166,7 +165,7 @@ class RipsModel(tf.keras.Model):
  m, d, c = self.mel, self.dim, self.card
  # Compute distance matrix
  - DX = tfa.losses.metric_learning.pairwise_distance(self.X)
  + DX = tf.math.sqrt(tf.reduce_sum((tf.expand_dims(self.X, 1)-tf.expand_dims(self.X, 0))**2, 2))
  DXX = tf.reshape(DX, [1, DX.shape[0], DX.shape[1]])
  # Turn numpy function into tensorflow function
  