Package mdp :: Package nodes :: Class NeighborsRegressorScikitsLearnNode

Class NeighborsRegressorScikitsLearnNode

Regression based on k-Nearest Neighbor Algorithm This node has been automatically generated by wrapping the scikits.learn.neighbors.NeighborsRegressor class from the sklearn library. The wrapped instance can be accessed through the scikits_alg attribute. The target is predicted by local interpolation of the targets associated of the k-Nearest Neighbors in the training set.

Different modes for estimating the result can be set via parameter mode. 'barycenter' will apply the weights that best reconstruct the point from its neighbors while 'mean' will apply constant weights to each point.

Parameters

n_neighbors : int, optional: Default number of neighbors. Defaults to 5.
window_size : int, optional: Window size passed to BallTree
mode : {'mean', 'barycenter'}, optional: Weights to apply to labels.
algorithm : {'auto', 'ball_tree', 'brute'}, optional: Algorithm used to compute the nearest neighbors. 'ball_tree' will construct a BallTree, while 'brute' will perform brute-force search. 'auto' will guess the most appropriate based on current dataset.

Examples

>>> X = [[0], [1], [2], [3]]
>>> y = [0, 0, 1, 1]
>>> from scikits.learn.neighbors import NeighborsRegressor
>>> neigh = NeighborsRegressor(n_neighbors=2)
>>> neigh.fit(X, y)
NeighborsRegressor(n_neighbors=2, window_size=1, mode='mean',
          algorithm='auto')
>>> print neigh.predict([[1.5]])
[ 0.5]

Notes

http://en.wikipedia.org/wiki/K-nearest_neighbor_algorithm

Instance Methods

[hide private]

__init__(self, input_dim=None, output_dim=None, dtype=None, **kwargs)
Regression based on k-Nearest Neighbor Algorithm This node has been automatically generated by wrapping the scikits.learn.neighbors.NeighborsRegressor class from the sklearn library. The wrapped instance can be accessed through the scikits_alg attribute. The target is predicted by local interpolation of the targets associated of the k-Nearest Neighbors in the training set.

list

_get_supported_dtypes(self)
Return the list of dtypes supported by this node. The types can be specified in any format allowed by numpy.dtype.

_label(self, x)

_stop_training(self, **kwargs)
Transform the data and labels lists to array objects and reshape them.

label(self, x)
Predict the target for the provided data This node has been automatically generated by wrapping the scikits.learn.neighbors.NeighborsRegressor class from the sklearn library. The wrapped instance can be accessed through the scikits_alg attribute. Parameters

stop_training(self, **kwargs)
Fit the model using X, y as training data This node has been automatically generated by wrapping the scikits.learn.neighbors.NeighborsRegressor class from the sklearn library. The wrapped instance can be accessed through the scikits_alg attribute. Parameters

Inherited from unreachable.newobject: __long__, __native__, __nonzero__, __unicode__, next

Inherited from object: __delattr__, __format__, __getattribute__, __hash__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __subclasshook__

Inherited from ClassifierCumulator

_check_train_args(self, x, labels)

_train(self, x, labels)
Cumulate all input data in a one dimensional list.

train(self, x, labels)
Cumulate all input data in a one dimensional list.

Inherited from ClassifierNode

_execute(self, x)

_prob(self, x, *args, **kargs)

execute(self, x)
Process the data contained in x.

prob(self, x, *args, **kwargs)
This function does classification or regression on a test vector T given a model with probability information. This node has been automatically generated by wrapping the scikits.learn.svm.classes.SVC class from the sklearn library. The wrapped instance can be accessed through the scikits_alg attribute. Parameters

rank(self, x, threshold=None)
Returns ordered list with all labels ordered according to prob(x) (e.g., [[3 1 2], [2 1 3], ...]).

Inherited from PreserveDimNode

_set_input_dim(self, n)

_set_output_dim(self, n)

Inherited from Node

__add__(self, other)

__call__(self, x, *args, **kwargs)
Calling an instance of Node is equivalent to calling its execute method.

__repr__(self)
repr(x)

__str__(self)
str(x)

_check_input(self, x)

_check_output(self, y)

_get_train_seq(self)

_if_training_stop_training(self)

_inverse(self, x)

_pre_execution_checks(self, x)
This method contains all pre-execution checks.

_pre_inversion_checks(self, y)
This method contains all pre-inversion checks.

_refcast(self, x)
Helper function to cast arrays to the internal dtype.

_set_dtype(self, t)

copy(self, protocol=None)
Return a deep copy of the node.

get_current_train_phase(self)
Return the index of the current training phase.

get_dtype(self)
Return dtype.

get_input_dim(self)
Return input dimensions.

get_output_dim(self)
Return output dimensions.

get_remaining_train_phase(self)
Return the number of training phases still to accomplish.

get_supported_dtypes(self)
Return dtypes supported by the node as a list of numpy.dtype objects.

has_multiple_training_phases(self)
Return True if the node has multiple training phases.

inverse(self, y, *args, **kwargs)
Invert y.

is_training(self)
Return True if the node is in the training phase, False otherwise.

save(self, filename, protocol=-1)
Save a pickled serialization of the node to filename. If filename is None, return a string.

set_dtype(self, t)
Set internal structures' dtype.

set_input_dim(self, n)
Set input dimensions.

set_output_dim(self, n)
Set output dimensions.

Static Methods

[hide private]

is_invertible()
Return True if the node can be inverted, False otherwise.

bool

is_trainable()
Return True if the node can be trained, False otherwise.

Properties

[hide private]

Inherited from object: __class__

Inherited from Node

_train_seq
List of tuples:

dtype
dtype

input_dim
Input dimensions

output_dim
Output dimensions

supported_dtypes
Supported dtypes

Method Details

[hide private]

init(self, input_dim=None, output_dim=None, dtype=None, **kwargs)
(Constructor)

Parameters

n_neighbors : int, optional: Default number of neighbors. Defaults to 5.
window_size : int, optional: Window size passed to BallTree
mode : {'mean', 'barycenter'}, optional: Weights to apply to labels.
algorithm : {'auto', 'ball_tree', 'brute'}, optional: Algorithm used to compute the nearest neighbors. 'ball_tree' will construct a BallTree, while 'brute' will perform brute-force search. 'auto' will guess the most appropriate based on current dataset.

Examples

>>> X = [[0], [1], [2], [3]]
>>> y = [0, 0, 1, 1]
>>> from scikits.learn.neighbors import NeighborsRegressor
>>> neigh = NeighborsRegressor(n_neighbors=2)
>>> neigh.fit(X, y)
NeighborsRegressor(n_neighbors=2, window_size=1, mode='mean',
          algorithm='auto')
>>> print neigh.predict([[1.5]])
[ 0.5]

Notes

http://en.wikipedia.org/wiki/K-nearest_neighbor_algorithm

Overrides: object.__init__

_get_supported_dtypes(self)

Return the list of dtypes supported by this node. The types can be specified in any format allowed by numpy.dtype.

Returns: list: The list of dtypes supported by this node.
Overrides: Node._get_supported_dtypes

_label(self, x)

Overrides: ClassifierNode._label

_stop_training(self, **kwargs)

Transform the data and labels lists to array objects and reshape them.

Overrides: Node._stop_training

is_invertible()
Static Method

Return True if the node can be inverted, False otherwise.

Overrides: Node.is_invertible: (inherited documentation)

is_trainable()
Static Method

Return True if the node can be trained, False otherwise.

Returns: bool: A boolean indicating whether the node can be trained.
Overrides: Node.is_trainable

label(self, x)

Predict the target for the provided data This node has been automatically generated by wrapping the scikits.learn.neighbors.NeighborsRegressor class from the sklearn library. The wrapped instance can be accessed through the scikits_alg attribute. Parameters

X : array: A 2-D array representing the test data.
n_neighbors : int, optional: Number of neighbors to get (default is the value passed to the constructor).

Returns

y: array: List of target values (one for each data sample).

Overrides: ClassifierNode.label

stop_training(self, **kwargs)

Fit the model using X, y as training data This node has been automatically generated by wrapping the scikits.learn.neighbors.NeighborsRegressor class from the sklearn library. The wrapped instance can be accessed through the scikits_alg attribute. Parameters

X : array-like, shape = [n_samples, n_features]: Training data.
y : array-like, shape = [n_samples]: Target values, array of integer values.
params : list of keyword, optional: Overwrite keywords from __init__

Overrides: Node.stop_training

Class NeighborsRegressorScikitsLearnNode

__init__(self, input_dim=None, output_dim=None, dtype=None, **kwargs) (Constructor)

_get_supported_dtypes(self)

_label(self, x)

_stop_training(self, **kwargs)

is_invertible() Static Method

is_trainable() Static Method

label(self, x)

stop_training(self, **kwargs)

init(self, input_dim=None, output_dim=None, dtype=None, **kwargs)
(Constructor)

is_invertible()
Static Method

is_trainable()
Static Method