RandomRBF¶
Random Radial Basis Function generator.
Produces a radial basis function stream. A number of centroids, having a random central position, a standard deviation, a class label and weight are generated. A new sample is created by choosing one of the centroids at random, taking into account their weights, and offsetting the attributes in a random direction from the centroid's center. The offset length is drawn from a Gaussian distribution.
This process will create a normally distributed hypersphere of samples on the surrounds of each centroid.
Parameters¶
-
seed_model (int) – defaults to
None
Model's seed to generate centroids If int,
seed
is used to seed the random number generator; If RandomState instance,seed
is the random number generator; If None, the random number generator is theRandomState
instance used bynp.random
. -
seed_sample (int) – defaults to
None
Sample's seed If int,
seed
is used to seed the random number generator; If RandomState instance,seed
is the random number generator; If None, the random number generator is theRandomState
instance used bynp.random
. -
n_classes (int) – defaults to
2
The number of class labels to generate.
-
n_features (int) – defaults to
10
The number of numerical features to generate.
-
n_centroids (int) – defaults to
50
The number of centroids to generate.
Attributes¶
-
desc
Return the description from the docstring.
Examples¶
>>> from river import synth
>>>
>>> dataset = synth.RandomRBF(seed_model=42, seed_sample=42,
... n_classes=4, n_features=4, n_centroids=20)
>>>
>>> for x, y in dataset.take(5):
... print(x, y)
{0: 0.9518, 1: 0.5263, 2: 0.2509, 3: 0.4177} 0
{0: 0.3383, 1: 0.8072, 2: 0.8051, 3: 0.4140} 3
{0: -0.2640, 1: 0.2275, 2: 0.6286, 3: -0.0532} 2
{0: 0.9050, 1: 0.6443, 2: 0.1270, 3: 0.4520} 2
{0: 0.1874, 1: 0.4348, 2: 0.9819, 3: -0.0459} 2
Methods¶
take
Iterate over the k samples.
Parameters
- k (int)