AgrawalGenerator#

class capymoa.stream.generator.AgrawalGenerator[source]#

Bases: MOAStream

An Agrawal Generator

>>> from capymoa.stream.generator import AgrawalGenerator
...
>>> stream = AgrawalGenerator()
>>> stream.next_instance()
LabeledInstance(
    Schema(generators.AgrawalGenerator ),
    x=[1.105e+05 0.000e+00 5.400e+01 3.000e+00 1.400e+01 4.000e+00 1.350e+05
        3.000e+01 3.547e+05],
    y_index=1,
    y_label='groupB'
)
>>> stream.next_instance().x
array([1.40893779e+05, 0.00000000e+00, 4.40000000e+01, 4.00000000e+00,
       1.90000000e+01, 7.00000000e+00, 1.35000000e+05, 2.00000000e+00,
       3.95015339e+05])
__init__(
instance_random_seed: int = 1,
classification_function: int = 1,
peturbation: float = 0.05,
balance_classes: bool = False,
)[source]#

Construct an Agrawal Generator

Parameters:

  • instance_random_seed – Seed for random generation of instances.

  • classification_function – Classification function used, as defined in the original paper.

  • peturbation – The amount of peturbation (noise) introduced to numeric values

  • balance – Balance the number of instances of each class.

__iter__() → Iterator[_AnyInstance][source]#

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[source]#

Get the next instance in the stream.

Returns:

The next instance in the stream.

cli_help() → str[source]#

Return cli help string for the stream.

get_moa_stream() → InstanceStream | None[source]#

Get the MOA stream object if it exists.

get_schema() → Schema[source]#

Return the schema of the stream.

has_more_instances() → bool[source]#

Return True if the stream have more instances to read.

next_instance() → _AnyInstance[source]#

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()[source]#

Restart the stream to read instances from the beginning.