<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:

def split_none(self):
        "Don't split the data and create an empty validation set."
        val = self[[]]
        val.ignore_empty = True
        return self._split(self.path, self, val)