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extended|mnist
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mweiss commited on
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Create fashion_mnist_ambiguous.py

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fashion_mnist_ambiguous.py ADDED
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+ """An ambiguous fashion mnist data set"""
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+
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+ import csv
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+
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+ import datasets
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+ import numpy as np
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+ from datasets.tasks import ImageClassification
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+
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+ _CITATION = """\
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+ @misc{https://doi.org/10.48550/arxiv.2207.10495,
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+ doi = {10.48550/ARXIV.2207.10495},
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+ url = {https://arxiv.org/abs/2207.10495},
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+ author = {Weiss, Michael and Gómez, André García and Tonella, Paolo},
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+ title = {A Forgotten Danger in DNN Supervision Testing: Generating and Detecting True Ambiguity},
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+ publisher = {arXiv},
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+ year = {2022}
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+ }
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+ """
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+
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+ _DESCRIPTION = """\
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+ The images were created such that they have an unclear ground truth,
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+ i.e., such that they are similar to multiple - but not all - of the datasets classes.
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+ Robust and uncertainty-aware models should be able to detect and flag these ambiguous images.
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+ As such, the dataset should be merged / mixed with the original dataset and we
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+ provide such 'mixed' splits for convenience. Please refer to the dataset card for details.
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+ """
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+
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+ _HOMEPAGE = "https://github.com/testingautomated-usi/ambiguous-datasets"
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+ _LICENSE = "https://raw.githubusercontent.com/testingautomated-usi/ambiguous-datasets/main/LICENSE"
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+
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+ _VERSION = "0.1.0"
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+ _URL = f"https://github.com/testingautomated-usi/ambiguous-datasets/releases/download/v{_VERSION}/"
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+
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+ _URLS = {
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+ "train": "fmnist-test.csv",
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+ "test": "fmnist-test.csv",
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+ }
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+
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+ _NAMES = [
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+ "T - shirt / top",
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+ "Trouser",
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+ "Pullover",
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+ "Dress",
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+ "Coat",
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+ "Sandal",
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+ "Shirt",
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+ "Sneaker",
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+ "Bag",
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+ "Ankle boot",
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+ ]
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+
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+
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+ class FashionMnistAmbiguous(datasets.GeneratorBasedBuilder):
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+ """An ambiguous fashion mnist data set"""
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+
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+ BUILDER_CONFIGS = [
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+ datasets.BuilderConfig(
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+ name="fashion_mnist_ambiguous",
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+ version=datasets.Version(_VERSION),
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+ description=_DESCRIPTION,
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+ )
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+ ]
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+
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+ def _info(self):
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+ return datasets.DatasetInfo(
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+ description=_DESCRIPTION,
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+ features=datasets.Features(
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+ {
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+ "image": datasets.Image(),
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+ "label": datasets.features.ClassLabel(names=_NAMES),
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+ "text_label": datasets.Value("string"),
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+ "p_label": datasets.Sequence(datasets.Value("float32"), length=10),
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+ "is_ambiguous": datasets.Value("bool"),
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+ }
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+ ),
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+ supervised_keys=("image", "label"),
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+ homepage=_HOMEPAGE,
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+ citation=_CITATION,
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+ task_templates=[ImageClassification(image_column="image", label_column="label")],
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+ )
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+
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+ def _split_generators(self, dl_manager):
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+ urls_to_download = {key: _URL + fname for key, fname in _URLS.items()}
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+ downloaded_files = dl_manager.download(urls_to_download)
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+
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+ return [
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+ datasets.SplitGenerator(
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+ name=datasets.Split.TRAIN,
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+ gen_kwargs={
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+ "filepath": downloaded_files["train"],
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+ "split": "train",
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+ },
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+ ),
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+ datasets.SplitGenerator(
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+ name=datasets.Split.TEST,
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+ gen_kwargs={
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+ "filepath": downloaded_files["test"],
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+ "split": "test",
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+ },
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+ ),
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+ datasets.SplitGenerator(
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+ name="train_mixed",
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+ gen_kwargs={
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+ "filepath": downloaded_files["train"],
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+ "split": "train_mixed",
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+ },
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+ ),
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+ datasets.SplitGenerator(
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+ name="test_mixed",
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+ gen_kwargs={
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+ "filepath": downloaded_files["test"],
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+ "split": "test_mixed",
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+ },
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+ ),
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+ ]
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+
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+ def _generate_examples(self, filepath, split):
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+ """This function returns the examples in the raw form."""
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+
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+ def _gen_amb_images():
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+ with open(filepath) as csvfile:
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+ spamreader = csv.reader(csvfile, delimiter=',', quotechar='"')
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+ for i, row in enumerate(spamreader):
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+ if i == 0:
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+ continue
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+
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+ det_label = int(row[7])
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+ class_1, class_2 = int(row[3]), int(row[4])
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+ p_1, p_2 = float(row[5]), float(row[6])
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+ text_label = f"p({_NAMES[class_1]})={p_1:.2f}, p({_NAMES[class_2]})={p_2:.2f}"
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+
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+ p_label = [0.0] * 10
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+ p_label[class_1] = p_1
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+ p_label[class_2] = p_2
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+
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+ image = np.array(row[9:], dtype=np.uint8).reshape(28, 28)
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+
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+ yield i, {"image": image, "label": det_label,
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+ "text_label": text_label, "p_label": p_label, "is_ambiguous": True}
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+
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+ if split == "test" or split == "train":
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+ yield from _gen_amb_images()
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+
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+ elif split == "test_mixed" or split == "train_mixed":
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+
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+ nominal_samples = []
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+ nom_split = "test" if split == "test_mixed" else "train"
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+ nominal_dataset = datasets.load_dataset("fashion_mnist", split=nom_split)
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+ for x in nominal_dataset:
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+ nominal_samples.append({
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+ "image": np.array(x["image"]),
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+ "label": x["label"],
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+ "text_label": f"p({_NAMES[x['label']]})=1",
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+ "p_label": [1.0 if i == x["label"] else 0.0 for i in range(10)],
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+ "is_ambiguous": False
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+ })
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+
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+ ambiguous_samples = list([x for i, x in _gen_amb_images()])
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+ all_samples = nominal_samples + ambiguous_samples
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+ np.random.RandomState(42).shuffle(all_samples)
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+
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+ for i, x in enumerate(all_samples):
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+ yield i, x