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from typing import Dict, Iterable
from datasets import Dataset, DatasetDict, IterableDataset, IterableDatasetDict
from .generator_utils import ReusableGenerator
class Stream:
"""A class for handling streaming data in a customizable way.
This class provides methods for generating, caching, and manipulating streaming data.
Attributes:
generator (function): A generator function for streaming data.
gen_kwargs (dict, optional): A dictionary of keyword arguments for the generator function.
streaming (bool): Whether the data is streaming or not.
caching (bool): Whether the data is cached or not.
"""
def __init__(self, generator, gen_kwargs=None, streaming=True, caching=False):
"""Initializes the Stream with the provided parameters.
Args:
generator (function): A generator function for streaming data.
gen_kwargs (dict, optional): A dictionary of keyword arguments for the generator function. Defaults to None.
streaming (bool, optional): Whether the data is streaming or not. Defaults to True.
caching (bool, optional): Whether the data is cached or not. Defaults to False.
"""
self.generator = generator
self.gen_kwargs = gen_kwargs if gen_kwargs is not None else {}
self.streaming = streaming
self.caching = caching
def _get_initator(self):
"""Private method to get the correct initiator based on the streaming and caching attributes.
Returns:
function: The correct initiator function.
"""
if self.streaming:
if self.caching:
return IterableDataset.from_generator
else:
return ReusableGenerator
else:
if self.caching:
return Dataset.from_generator
else:
raise ValueError("Cannot create non-streaming non-caching stream")
def _get_stream(self):
"""Private method to get the stream based on the initiator function.
Returns:
object: The stream object.
"""
return self._get_initator()(self.generator, gen_kwargs=self.gen_kwargs)
def set_caching(self, caching):
self.caching = caching
def set_streaming(self, streaming):
self.streaming = streaming
def __iter__(self):
return iter(self._get_stream())
def unwrap(self):
return self._get_stream()
def peak(self):
return next(iter(self))
def take(self, n):
for i, instance in enumerate(self):
if i >= n:
break
yield instance
def __repr__(self):
return f"{self.__class__.__name__}(generator={self.generator.__name__}, gen_kwargs={self.gen_kwargs}, streaming={self.streaming}, caching={self.caching})"
def is_stream(obj):
return isinstance(obj, IterableDataset) or isinstance(obj, Stream) or isinstance(obj, Dataset)
class MultiStream(dict):
"""A class for handling multiple streams of data in a dictionary-like format.
This class extends dict and its values should be instances of the Stream class.
Attributes:
data (dict): A dictionary of Stream objects.
"""
def __init__(self, data=None):
"""Initializes the MultiStream with the provided data.
Args:
data (dict, optional): A dictionary of Stream objects. Defaults to None.
Raises:
AssertionError: If the values are not instances of Stream or keys are not strings.
"""
for key, value in data.items():
isinstance(value, Stream), "MultiStream values must be Stream"
isinstance(key, str), "MultiStream keys must be strings"
super().__init__(data)
def get_generator(self, key):
"""Gets a generator for a specified key.
Args:
key (str): The key for the generator.
Yields:
object: The next value in the stream.
"""
yield from self[key]
def unwrap(self, cls):
return cls({key: value.unwrap() for key, value in self.items()})
def to_dataset(self) -> DatasetDict:
return DatasetDict(
{key: Dataset.from_generator(self.get_generator, gen_kwargs={"key": key}) for key in self.keys()}
)
def to_iterable_dataset(self) -> IterableDatasetDict:
return IterableDatasetDict(
{key: IterableDataset.from_generator(self.get_generator, gen_kwargs={"key": key}) for key in self.keys()}
)
def __setitem__(self, key, value):
assert isinstance(value, Stream), "StreamDict values must be Stream"
assert isinstance(key, str), "StreamDict keys must be strings"
super().__setitem__(key, value)
@classmethod
def from_generators(cls, generators: Dict[str, ReusableGenerator], streaming=True, caching=False):
"""Creates a MultiStream from a dictionary of ReusableGenerators.
Args:
generators (Dict[str, ReusableGenerator]): A dictionary of ReusableGenerators.
streaming (bool, optional): Whether the data should be streaming or not. Defaults to True.
caching (bool, optional): Whether the data should be cached or not. Defaults to False.
Returns:
MultiStream: A MultiStream object.
"""
assert all(isinstance(v, ReusableGenerator) for v in generators.values())
return cls(
{
key: Stream(
generator.get_generator(),
gen_kwargs=generator.get_gen_kwargs(),
streaming=streaming,
caching=caching,
)
for key, generator in generators.items()
}
)
@classmethod
def from_iterables(cls, iterables: Dict[str, Iterable], streaming=True, caching=False):
"""Creates a MultiStream from a dictionary of iterables.
Args:
iterables (Dict[str, Iterable]): A dictionary of iterables.
streaming (bool, optional): Whether the data should be streaming or not. Defaults to True.
caching (bool, optional): Whether the data should be cached or not. Defaults to False.
Returns:
MultiStream: A MultiStream object.
"""
return cls(
{
key: Stream(iterable.__iter__, gen_kwargs={}, streaming=streaming, caching=caching)
for key, iterable in iterables.items()
}
)
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