Saver

class torchdata.datapipes.iter.Saver(source_datapipe: IterDataPipe[Tuple[Any, Union[bytes, bytearray, str]]], mode: str = 'w', filepath_fn: Optional[Callable] = None)

Takes in a DataPipe of tuples of metadata and data, saves the data to the target path generated by the filepath_fn and metadata, and yields file path on local file system (functional name: save_to_disk).

Parameters:

• source_datapipe – Iterable DataPipe with tuples of metadata and data

• mode – Node in which the file will be opened for write the data ("w" by default)

• filepath_fn – Function that takes in metadata and returns the target path of the new file

Example

>>> from torchdata.datapipes.iter import IterableWrapper
>>> import os
>>> def filepath_fn(name: str) -> str:
>>>     return os.path.join(".", os.path.basename(name))
>>> name_to_data = {"1.txt": b"DATA1", "2.txt": b"DATA2", "3.txt": b"DATA3"}
>>> source_dp = IterableWrapper(sorted(name_to_data.items()))
>>> saver_dp = source_dp.save_to_disk(filepath_fn=filepath_fn, mode="wb")
>>> res_file_paths = list(saver_dp)
>>> res_file_paths
['./1.txt', './2.txt', './3.txt']