SemiParametricClassifierBasedRegressorTrainer¶
- class menpo.fit.regression.trainer.SemiParametricClassifierBasedRegressorTrainer(classifiers, transform, reference_shape, regression_type=<function mlr at 0x7f5c2da62cf8>, patch_shape=(16, 16), update='compositional', noise_std=0.04, rotation=False, n_perturbations=10)[source]¶
Bases: SemiParametricRegressorTrainer
Class for training a Semi-Parametric Classifier-Based Regressor. This means that the classifiers are used instead of features.
Parameters: classifiers : list of Classifier Functions
List of classifiers.
transform : Affine
The transform used for warping.
reference_shape : PointCloud
The reference shape that will be used.
regression_type : function, optional
A function that defines the regression technique to be used. Examples of such closures can be found in Functions
patch_shape : tuple, optional
The shape of the patches that will be extracted.
noise_std : float, optional
The standard deviation of the gaussian noise used to produce the training shapes.
rotation : boolean, optional
Specifies whether ground truth in-plane rotation is to be used to produce the training shapes.
n_perturbations : int, optional
Defines the number of perturbations that will be applied to the training shapes.
interpolator : string
Specifies the interpolator used in warping.
- delta_ps(gt_shape, perturbed_shape)¶
Method to generate the delta_ps for the regression.
Parameters: gt_shape : PointCloud
The ground truth shape.
perturbed_shape : PointCloud
The perturbed shape.
- features(image, shape)[source]¶
Method that extracts the features for the regression, which in this case are patch based.
Parameters: image : MaskedImage
The current image.
shape : PointCloud
The current shape.
- perturb_shapes(gt_shape)¶
Perturbs the given shapes. The number of perturbations is defined by n_perturbations.
Parameters: gt_shape : PointCloud list
List of the shapes that correspond to the images. will be perturbed.
Returns: perturbed_shapes : PointCloud list
List of the perturbed shapes.
- train(images, shapes, perturbed_shapes=None, verbose=False, **kwargs)¶
Trains a Regressor given a list of landmarked images.
Parameters: images : list of MaskedImage
The set of landmarked images from which to train the regressor.
shapes : PointCloud list
List of the shapes that correspond to the images.
perturbed_shapes : PointCloud list, optional
List of the perturbed shapes used for the regressor training.
verbose : boolean, optional
Flag that controls information and progress printing.
Returns: regressor : :map:`Regressor`
A regressor object.
Raises: ValueError :
The number of shapes must be equal to the number of images.
ValueError :
The number of perturbed shapes must be equal or multiple to the number of images.
- algorithm¶
Returns the algorithm name.