Delete legacy JSON metadata

Delete legacy `dataset_infos.json`.

dataset_infos.json

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-{"thainer": {"description": "ThaiNER (v1.3) is a 6,456-sentence named entity recognition dataset created from expanding the 2,258-sentence\n[unnamed dataset](http://pioneer.chula.ac.th/~awirote/Data-Nutcha.zip) by\n[Tirasaroj and Aroonmanakun (2012)](http://pioneer.chula.ac.th/~awirote/publications/).\nIt is used to train NER taggers in [PyThaiNLP](https://github.com/PyThaiNLP/pythainlp).\nThe NER tags are annotated by [Tirasaroj and Aroonmanakun (2012)]((http://pioneer.chula.ac.th/~awirote/publications/))\nfor 2,258 sentences and the rest by [@wannaphong](https://github.com/wannaphong/).\nThe POS tags are done by [PyThaiNLP](https://github.com/PyThaiNLP/pythainlp)'s `perceptron` engine trained on `orchid_ud`.\n[@wannaphong](https://github.com/wannaphong/) is now the only maintainer of this dataset.\n", "citation": "@misc{Wannaphong Phatthiyaphaibun_2019,\n    title={wannaphongcom/thai-ner: ThaiNER 1.3},\n    url={https://zenodo.org/record/3550546},\n    DOI={10.5281/ZENODO.3550546},\n    abstractNote={Thai Named Entity Recognition},\n    publisher={Zenodo},\n    author={Wannaphong Phatthiyaphaibun},\n    year={2019},\n    month={Nov}\n}\n", "homepage": "https://github.com/wannaphong/thai-ner/", "license": "CC-BY 3.0", "features": {"id": {"dtype": "int32", "id": null, "_type": "Value"}, "tokens": {"feature": {"dtype": "string", "id": null, "_type": "Value"}, "length": -1, "id": null, "_type": "Sequence"}, "pos_tags": {"feature": {"num_classes": 14, "names": ["ADJ", "ADP", "ADV", "AUX", "CCONJ", "DET", "NOUN", "NUM", "PART", "PRON", "PROPN", "PUNCT", "SCONJ", "VERB"], "names_file": null, "id": null, "_type": "ClassLabel"}, "length": -1, "id": null, "_type": "Sequence"}, "ner_tags": {"feature": {"num_classes": 28, "names": ["B-DATE", "B-EMAIL", "B-LAW", "B-LEN", "B-LOCATION", "B-MONEY", "B-ORGANIZATION", "B-PERCENT", "B-PERSON", "B-PHONE", "B-TIME", "B-URL", "B-ZIP", "B-\u0e44\u0e21\u0e48\u0e22\u0e37\u0e19\u0e22\u0e31\u0e19", "I-DATE", "I-EMAIL", "I-LAW", "I-LEN", "I-LOCATION", "I-MONEY", "I-ORGANIZATION", "I-PERCENT", "I-PERSON", "I-PHONE", "I-TIME", "I-URL", "I-\u0e44\u0e21\u0e48\u0e22\u0e37\u0e19\u0e22\u0e31\u0e19", "O"], "names_file": null, "id": null, "_type": "ClassLabel"}, "length": -1, "id": null, "_type": "Sequence"}}, "post_processed": null, "supervised_keys": null, "builder_name": "thainer", "config_name": "thainer", "version": {"version_str": "1.3.0", "description": null, "major": 1, "minor": 3, "patch": 0}, "splits": {"train": {"name": "train", "num_bytes": 8117902, "num_examples": 6348, "dataset_name": "thainer"}}, "download_checksums": {"https://github.com/wannaphong/thai-ner/raw/master/model/1.3/data-pos.conll": {"num_bytes": 5456461, "checksum": "be9f897b409554f06501c3a26159115fce5140d5654c634276b1a40b8c4dbabd"}}, "download_size": 5456461, "post_processing_size": null, "dataset_size": 8117902, "size_in_bytes": 13574363}}