<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_distance(F, x):
 """Helper function for margin-based loss. Return a distance matrix given a matrix."""

    n = x.shape[0]

    square = F.sum(x ** 2.0, axis=1, keepdims=True)
    distance_square = square + square.transpose() - (2.0 * F.dot(x, x.transpose()))

    # Adding identity to make sqrt work.
    return F.sqrt(distance_square + F.array(np.identity(n)))