{"url":"/dataset/nkl","name":"NKL","full_name":null,"description_markdown":"NKL (short for NanKai Lines) is a dataset for semantic line detection. Semantic lines are meaningful line structures that outline the conceptual structure of natural images.  The NKL dataset contains 5,000 images of various scenes. Each of these images is annotated by multiple skilled human annotators. The dataset is split into training and validation subsets. There are 4,000 images in the training set and 1,000 in the validation set.","description_withheld":null,"homepage":"https://kaizhao.net/nkl","introduced_date":"2020-08-23","introduced_date_note":null,"introduced_by":{"paper":"/paper/deep-hough-transform-for-semantic-line","title":"Deep Hough Transform for Semantic Line Detection","first_author":"Kai Zhao","url":null},"license":{"name":"https://kaizhao.net/nkl","url":"https://kaizhao.net/nkl"},"modalities":[{"name":"Images","url":"/datasets/modality/images"}],"tasks":[{"name":"Line Detection","url":"/task/line-detection","datasets_with_task":"/datasets/task/line-detection"}],"languages":[],"variants":["NKL"],"data_loaders":[],"num_papers_in_archive":3,"source":{"archive":"pwc-archive (Hugging Face), CC BY-SA 4.0","snapshot":"2025-07-28"},"benchmarks":[{"leaderboard":"/sota/line-detection-on-nkl","task":"Line Detection","dataset_variant":"NKL","rows":2,"metrics":["F_measure (EA)"],"first_row_in_archive_order":{"model":"HSLD","paper":"/paper/harmonious-semantic-line-detection-via","metrics":{"F_measure (EA)":"0.803"},"code_links":[{"title":"dongkwonjin/Semantic-Line-MWCS","url":"https://github.com/dongkwonjin/Semantic-Line-MWCS"}]},"note":"rows are the archive's own order at snapshot; nothing here re-ranks them"}],"papers_with_a_benchmark_row":[{"paper":"/paper/harmonious-semantic-line-detection-via","title":"Harmonious Semantic Line Detection via Maximal Weight Clique Selection","date":"2021-04-14","rows_on_this_dataset":1,"code_links":1,"syntology":{"read_at":"2026-09-24T18:15:14+00:00","samples_harvested":1,"samples_ran":0,"samples_unverified":1,"pointer_only_for_licence":0,"claim":"Per-sample execution on synthesized fixtures; not a correctness claim."}},{"paper":"/paper/deep-hough-transform-for-semantic-line","title":"Deep Hough Transform for Semantic Line Detection","date":"2020-03-10","rows_on_this_dataset":1,"code_links":2,"syntology":null}],"syntology_totals":{"read_at":"2026-09-24T18:15:14+00:00","papers_with_samples":1,"samples_harvested":1,"samples_ran":0,"samples_unverified":1,"pointer_only_for_licence":0,"papers_with_no_sample_that_ran":1,"note":"the per-paper counts above, summed; not a rate"},"papers_note":"The archive never published its papers-using-dataset list; these are papers with a leaderboard row on this dataset's benchmarks."}