ARFFStream

class capymoa.stream.ARFFStream

Bases: Stream

A datastream originating from an ARFF file.

__init__(path: str, CLI: str | None = None, class_index: int = -1)

Construct an ARFFStream object from a file path.

Parameters:

• path – A filepath

• CLI – Additional command line arguments to pass to the MOA stream.

CLI_help() → str

Return cli help string for 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() → LabeledInstance | RegressionInstance

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.