Delete legacy JSON metadata

Delete legacy `dataset_infos.json`.

dataset_infos.json

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-{"default": {"description": "Turkish Wikipedia Named-Entity Recognition and Text Categorization\n(TWNERTC) dataset is a collection of automatically categorized and annotated\nsentences obtained from Wikipedia. The authors constructed large-scale\ngazetteers by using a graph crawler algorithm to extract\nrelevant entity and domain information\nfrom a semantic knowledge base, Freebase.\nThe constructed gazetteers contains approximately\n300K entities with thousands of fine-grained entity types\nunder 77 different domains.\n", "citation": "@InProceedings@article{DBLP:journals/corr/SahinTYES17,\n  author    = {H. Bahadir Sahin and\n               Caglar Tirkaz and\n               Eray Yildiz and\n               Mustafa Tolga Eren and\n               Omer Ozan Sonmez},\n  title     = {Automatically Annotated Turkish Corpus for Named Entity Recognition\n               and Text Categorization using Large-Scale Gazetteers},\n  journal   = {CoRR},\n  volume    = {abs/1702.02363},\n  year      = {2017},\n  url       = {http://arxiv.org/abs/1702.02363},\n  archivePrefix = {arXiv},\n  eprint    = {1702.02363},\n  timestamp = {Mon, 13 Aug 2018 16:46:36 +0200},\n  biburl    = {https://dblp.org/rec/journals/corr/SahinTYES17.bib},\n  bibsource = {dblp computer science bibliography, https://dblp.org}\n}\n", "homepage": "https://data.mendeley.com/datasets/cdcztymf4k/1", "license": "", "features": {"id": {"dtype": "string", "id": null, "_type": "Value"}, "tokens": {"feature": {"dtype": "string", "id": null, "_type": "Value"}, "length": -1, "id": null, "_type": "Sequence"}, "domain": {"num_classes": 25, "names": ["architecture", "basketball", "book", "business", "education", "fictional_universe", "film", "food", "geography", "government", "law", "location", "military", "music", "opera", "organization", "people", "religion", "royalty", "soccer", "sports", "theater", "time", "travel", "tv"], "names_file": null, "id": null, "_type": "ClassLabel"}, "ner_tags": {"feature": {"num_classes": 9, "names": ["O", "B-PERSON", "I-PERSON", "B-ORGANIZATION", "I-ORGANIZATION", "B-LOCATION", "I-LOCATION", "B-MISC", "I-MISC"], "names_file": null, "id": null, "_type": "ClassLabel"}, "length": -1, "id": null, "_type": "Sequence"}}, "post_processed": null, "supervised_keys": null, "builder_name": "turkish_ner", "config_name": "default", "version": {"version_str": "0.0.0", "description": null, "major": 0, "minor": 0, "patch": 0}, "splits": {"train": {"name": "train", "num_bytes": 177658278, "num_examples": 532629, "dataset_name": "turkish_ner"}}, "download_checksums": {"https://data.mendeley.com/public-files/datasets/cdcztymf4k/files/5557ef78-7d53-4a01-8241-3173c47bbe10/file_downloaded": {"num_bytes": 204393976, "checksum": "e03e2867a225d63f0139dd4ced028e5da795a8a48e140ad4c17999a8560dbc57"}}, "download_size": 204393976, "post_processing_size": null, "dataset_size": 177658278, "size_in_bytes": 382052254}}