Source code for torch_uncertainty.datasets.classification.mnist_c
import logging
from collections.abc import Callable
from pathlib import Path
from typing import Any, Literal
import numpy as np
from torchvision.datasets import VisionDataset
from torchvision.datasets.utils import (
check_integrity,
download_and_extract_archive,
)
[docs]class MNISTC(VisionDataset):
"""The corrupted MNIST-C Dataset.
Args:
root (str): Root directory of the datasets.
transform (callable, optional): A function/transform that takes in
a PIL image and returns a transformed version. E.g,
``transforms.RandomCrop``. Defaults to None.
target_transform (callable, optional): A function/transform that
takes in the target and transforms it. Defaults to None.
subset (str): The subset to use, one of ``all`` or the keys in
``mnistc_subsets``.
download (bool, optional): If True, downloads the dataset from the
internet and puts it in root directory. If dataset is already
downloaded, it is not downloaded again. Defaults to False.
References:
Mu, Norman, and Justin Gilmer. "MNIST-C: A robustness benchmark for
computer vision." In ICMLW 2019.
License:
The dataset is released by the dataset's authors under the Creative
Commons Attribution 4.0.
Note:
This dataset does not contain severity levels. Raise an issue if you
want someone to investigate this.
"""
base_folder = "mnist_c"
zip_md5 = "4b34b33045869ee6d424616cd3a65da3"
mnistc_subsets = [
"brightness",
"canny_edges",
"dotted_line",
"fog",
"glass_blur",
"impulse_noise",
"motion_blur",
"rotate",
"scale",
"shear",
"shot_noise",
"spatter",
"stripe",
"translate",
"zigzag",
]
url = "https://zenodo.org/record/3239543/files/mnist_c.zip"
filename = "mnist_c.zip"
def __init__(
self,
root: str | Path,
transform: Callable | None = None,
target_transform: Callable | None = None,
split: Literal["train", "test"] = "test",
subset: str = "all",
download: bool = False,
) -> None:
self.root = Path(root)
# Download the new targets
if download:
self.download()
if not self._check_integrity():
raise RuntimeError(
"Dataset not found. You can use download=True to download it."
)
super().__init__(
root=self.root / self.base_folder,
transform=transform,
target_transform=target_transform,
)
if subset not in ["all", *self.mnistc_subsets]:
raise ValueError(
f"The subset '{subset}' does not exist in MNIST-C."
)
self.subset = subset
if split not in ["train", "test"]:
raise ValueError(
f"The split '{split}' should be either 'train' or 'test'."
)
self.split = split
samples, labels = self.make_dataset(self.root, self.subset, self.split)
self.samples = samples
self.labels = labels
[docs] def make_dataset(
self,
root: Path,
subset: str,
split: Literal["train", "test"],
) -> tuple[np.ndarray, np.ndarray]:
r"""Build the corrupted dataset according to the chosen subset and
severity. If the subset is 'all', gather all corruption types
in the dataset.
Args:
root (Path):The path to the dataset.
subset (str): The name of the corruption subset to be used. Choose
`all` for the dataset to contain all subsets.
split (str): The split to be used, either `train` or `test`.
Returns:
Tuple[np.ndarray, np.ndarray]: The samples and labels of the chosen.
"""
if subset == "all":
# take any subset to get the labels
labels: np.ndarray = np.load(root / f"identity/{split}_labels.npy")
sample_arrays = [
np.load(root / mnist_subset / f"{split}_images.npy")
for mnist_subset in self.mnistc_subsets
]
samples = np.concatenate(sample_arrays, axis=0)
labels = np.tile(labels, len(self.mnistc_subsets))
else:
samples: np.ndarray = np.load(root / subset / f"{split}_images.npy")
labels: np.ndarray = np.load(root / f"{split}_labels.npy")
return samples, labels
def __len__(self) -> int:
"""The number of samples in the dataset."""
return self.labels.shape[0]
def __getitem__(self, index: int) -> Any:
"""Get the samples and targets of the dataset.
Args:
index (int): The index of the sample to get.
"""
sample, target = (
self.samples[index],
self.labels[index],
)
if self.transform is not None:
sample = self.transform(sample)
if self.target_transform is not None:
target = self.target_transform(target)
return sample, target
def _check_integrity(self) -> bool:
"""Check the integrity of the dataset."""
fpath = self.root / self.filename
return check_integrity(fpath, self.zip_md5)
[docs] def download(self) -> None:
"""Download the dataset."""
if self._check_integrity():
logging.info("Files already downloaded and verified")
return
download_and_extract_archive(
self.url, self.root, filename=self.filename, md5=self.zip_md5
)