Delete legacy JSON metadata

Delete legacy `dataset_infos.json`.

dataset_infos.json

@@ -1 +0,0 @@
-{"mnist": {"description": "The MNIST dataset consists of 70,000 28x28 black-and-white images in 10 classes (one for each digits), with 7,000\nimages per class. There are 60,000 training images and 10,000 test images.\n", "citation": "@article{lecun2010mnist,\n  title={MNIST handwritten digit database},\n  author={LeCun, Yann and Cortes, Corinna and Burges, CJ},\n  journal={ATT Labs [Online]. Available: http://yann.lecun.com/exdb/mnist},\n  volume={2},\n  year={2010}\n}\n", "homepage": "http://yann.lecun.com/exdb/mnist/", "license": "", "features": {"image": {"id": null, "_type": "Image"}, "label": {"num_classes": 10, "names": ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9"], "names_file": null, "id": null, "_type": "ClassLabel"}}, "post_processed": null, "supervised_keys": {"input": "image", "output": "label"}, "task_templates": [{"task": "image-classification", "image_column": "image", "label_column": "label", "labels": ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9"]}], "builder_name": "mnist", "config_name": "mnist", "version": {"version_str": "1.0.0", "description": null, "major": 1, "minor": 0, "patch": 0}, "splits": {"train": {"name": "train", "num_bytes": 17470848, "num_examples": 60000, "dataset_name": "mnist"}, "test": {"name": "test", "num_bytes": 2916440, "num_examples": 10000, "dataset_name": "mnist"}}, "download_checksums": {"https://storage.googleapis.com/cvdf-datasets/mnist/train-images-idx3-ubyte.gz": {"num_bytes": 9912422, "checksum": "440fcabf73cc546fa21475e81ea370265605f56be210a4024d2ca8f203523609"}, "https://storage.googleapis.com/cvdf-datasets/mnist/train-labels-idx1-ubyte.gz": {"num_bytes": 28881, "checksum": "3552534a0a558bbed6aed32b30c495cca23d567ec52cac8be1a0730e8010255c"}, "https://storage.googleapis.com/cvdf-datasets/mnist/t10k-images-idx3-ubyte.gz": {"num_bytes": 1648877, "checksum": "8d422c7b0a1c1c79245a5bcf07fe86e33eeafee792b84584aec276f5a2dbc4e6"}, "https://storage.googleapis.com/cvdf-datasets/mnist/t10k-labels-idx1-ubyte.gz": {"num_bytes": 4542, "checksum": "f7ae60f92e00ec6debd23a6088c31dbd2371eca3ffa0defaefb259924204aec6"}}, "download_size": 11594722, "post_processing_size": null, "dataset_size": 20387288, "size_in_bytes": 31982010}}