message: Removed some style issues in the local mbtr implementation.
diff: @@ -2,18 +2,17 @@ import math
  import numpy as np
  import itertools
  -from scipy.spatial.distance import squareform, pdist, cdist
  -from scipy.sparse import lil_matrix, coo_matrix
  -from scipy.special import erf
  +from scipy.spatial.distance import squareform, pdist
  +from scipy.sparse import lil_matrix
  -from describe.core import System
  from describe.descriptors import MBTR
  -import matplotlib.pyplot as mpl
  +# import matplotlib.pyplot as mpl
  class LMBTR(MBTR):
  - """Implementation of local -- per chosen atom -- kind of the Many-body tensor representation up to K=3.
  + """Implementation of local -- per chosen atom -- kind of the Many-body
  + tensor representation up to K=3.
  You can use this descriptor for finite and periodic systems. When dealing
  with periodic systems, please always use a primitive cell. It does not
  