SEA

class capymoa.stream.generator.SEA

Bases: MOAStream

Generates SEA concepts functions.

>>> from capymoa.stream.generator import SEA
...
>>> stream = SEA()
>>> stream.next_instance()
LabeledInstance(
    Schema(generators.SEAGenerator ),
    x=[7.309 4.101 2.077],
    y_index=1,
    y_label='groupB'
)
>>> stream.next_instance().x
array([6.58867239, 7.10739628, 1.52736201])

Street, W. N., & Kim, Y. (2001). A streaming ensemble algorithm (SEA) for large-scale classification. doi:10.1145/502512.502568

__init__(

instance_random_seed: int = 1,

function: int = 1,

balance_classes: bool = False,

noise_percentage: int = 10,

)

Construct a SEA datastream generator.

Parameters:

• instance_random_seed – Seed for random generation of instances, defaults to 1

• function – Classification function used, as defined in the original paper, defaults to 1

• balance_classes – Balance the number of instances of each class, defaults to False

• noise_percentage – Percentage of noise to add to the data, defaults to 10

CLI_help() → str

Return cli help string for the stream.

__iter__() → Iterator[_AnyInstance]

Get an iterator over the stream.

This will NOT restart the stream if it has already been iterated over. Please use the restart() method to restart the stream.

Yield:

An iterator over the stream.

__next__() → _AnyInstance

Get the next instance in the stream.

Returns:

The next instance in the stream.

get_moa_stream() → InstanceStream | None

Get the MOA stream object if it exists.

get_schema() → Schema

Return the schema of the stream.

has_more_instances() → bool

Return True if the stream have more instances to read.

next_instance() → _AnyInstance

Return the next instance in the stream.

Raises:

ValueError – If the machine learning task is neither a regression nor a classification task.

Returns:

A labeled instances or a regression depending on the schema.

restart()

Restart the stream to read instances from the beginning.