DP

class menpo.base.DP

Bases: object

Object that is able to take it’s own derivative wrt parametrization.

The parametrization of objects is typically defined by the Vectorizable interface. As a result, DP is a mix-in that should be inherited along with Vectorizable.

d_dp(points)

The derivative of this spatial object wrt parametrization changes evaluated at points.

Parameters:

points : (n_points, n_dims) ndarray

The spatial points at which the derivative should be evaluated.

Returns:

d_dp : (n_points, n_parameters, n_dims) ndarray

The jacobian wrt parametrization.

d_dp[i, j, k] is the scalar differential change that the k’th dimension of the i’th point experiences due to a first order change in the j’th scalar in the parametrization vector.