Function "delete_descendents_of_token" missing

[Cybernetic1]

In file ncc_node.py, line 65:

Token.delete_token_and_descendents(token)

should actually be Token.delete_descendents_of_token(token).

This function is explained in [Doorenbos 1995] section 2.8 (p.49). The pseudo-code is in p.158 of Appendix A.

Just add this function in Python, under class Token, in common.py:

@classmethod
def delete_descendents_of_token(cls, t):
    """
    :type t: Token
    """
    while t.children != []:
        cls.delete_token_and_descendents(t.children[0])

When the bug is not fixed, we get some errors when an NCC Partner node tries to delete tokens and complains that the tokens are not in the list.

[Cybernetic1]

PS: the right_activation function in negative_node.py needs to be changed in the same manner as well (line 50).

[dbbbit]

could you give a test case, i can't remember the detail now :(