message: removed cartesian product in utils geometry.py
diff: @@ -224,48 +224,3 @@ def get_extended_system(system, radial_cutoff, centers=None, return_cell_indices
  return extended_system, cell_indices
  -
  -def cartesian(arrays, out=None):
  - """
  - Generate a cartesian product of input arrays.
  -
  - Args:
  - arrays(sequence of arrays): The arrays from which the product is
  - created.
  - out(ndarray): Array to place the cartesian product in.
  -
  - Returns:
  - ndarray: 2-D array of shape (M, len(arrays)) containing cartesian
  - products formed of input arrays.
  -
  - Example:
  - --------
  - >>> cartesian(([1, 2, 3], [4, 5], [6, 7]))
  - array([[1, 4, 6],
  - [1, 4, 7],
  - [1, 5, 6],
  - [1, 5, 7],
  - [2, 4, 6],
  - [2, 4, 7],
  - [2, 5, 6],
  - [2, 5, 7],
  - [3, 4, 6],
  - [3, 4, 7],
  - [3, 5, 6],
  - [3, 5, 7]])
  - """
  -
  - arrays = [np.asarray(x) for x in arrays]
  - dtype = arrays[0].dtype
  -
  - n = np.prod([x.size for x in arrays])
  - if out is None:
  - out = np.zeros([n, len(arrays)], dtype=dtype)
  -
  - m = int(n / arrays[0].size)
  - out[:, 0] = np.repeat(arrays[0], m)
  - if arrays[1:]:
  - cartesian(arrays[1:], out=out[0:m, 1:])
  - for j in range(1, arrays[0].size):
  - out[j*m:(j+1)*m, 1:] = out[0:m, 1:]
  - return out
  