DP¶
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class
menpofit.differentiable.
DP
¶ Bases:
object
Object that is able to take its own derivative with respect to the parametrisation.
The parametrisation of objects is typically defined by the menpo.base.Vectorizable interface. As a result,
DP
is a mix-in that should be inherited along with menpo.base.Vectorizable.-
d_dp
(points)¶ The derivative of this spatial object with respect to the parametrisation 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 with respect to the parametrisation.d_dp[i, j, k]
is the scalar differential change that thek
‘th dimension of thei
‘th point experiences due to a first order change in thej
‘th scalar in the parametrisation vector.
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