<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def edges_unique_length(self):
 """ How long is each unique edge. Returns length : (len(self.edges_unique), ) float Length of each unique edge """

        vector = np.subtract(*self.vertices[self.edges_unique.T])
        length = np.linalg.norm(vector, axis=1)
        return length