Table 25.

The number of 10 most present terms in 2020, with variants, date, authors, and publications where they were first introduced, number of occurrences and existences in 2020, number of occurrences, frequency, number of existences and presence in the 55-year archive, with ranking and average number of occurrences of the terms in the documents where they appear, and comparison with the ranking in 2015 (the terms which joined the top 10 are marked in green, while the 5 which went out are marked in orange with their new and former ranking).

Rank 2020	Previous Rank 2015	Term	Variants of all sorts	Event when the term appeared	Authors who introduced the term	Documents	Archive #occurences	Archive frequency	Archive #existence	Archive presence	Archive rank occurrences	Archive rank existences	Archive occurrence/existence ratio	#Occurrences of the term in 2020 (by other people than the inventors)	#Existences in 2020 (by other people than the inventors)	Frequency in 2020	Presence in 2020
1	1	Dataset	Data-set, data-sets, datasets	1966	Laurence Urdang	cath1966-3	240,691	0.0076	24,288	0.290	1	2	9.91	59,794	4,313	0.0224	0.795
2	30	Embedding	Embeddings	1967	Aravind K. Joshi, Danuta Hiz, Jane J. Robinson, Steven I. Laszlo	C67-1007 C67-1010 C67-1015	145,845	0.0046	11,804	0.141	6	25	12.36	37,346	3,193	0.0140	0.588
3	2	Metric	Metrics	1965	A Andreyewsky	C65-1002	95,056	0.0030	20,451	0.244	12	4	4.65	14,352	2,915	0.0054	0.537
4	7	Neural network	ANN, ANNs, Artificial Neural Network, Artificial Neural Networks, NN, NNs, Neural Network, Neural Networks, NeuralNet, NeuralNets, neural net, neural nets, neural networks	1972	P J. Brown	cath1972-21	97,031	0.0031	18,716	0.223	11	8	5.18	9,190	2,623	0.0034	0.483
5	>200	Encoder	Encoders	1968	Raymond F. Erickson	cath1968-2	62,324	0.0020	6,874	0.082	28	74	9.07	21,444	2,350	0.0080	0.433
6	6	Annotation	Annotations	1967	Kenneth Janda, Martin Kay	cath1967-12 cath1967-8	187,175	0.0059	19,942	0.238	2	5	9.39	21,751	2,160	0.0081	0.398
7	67	Hyperparameter	hyperparam, hyperparameters	1989	G Demoment	taslp1989-131	22,593	0.0007	7,900	0.094	104	58	2.86	5,232	2,110	0.0020	0.389
8	9	LM	LMs, Language Model, Language Models, language model, language models	1965	Sheldon Klein	C65-1014	164,564	0.0052	19,080	0.228	4	6	8.62	14,850	1,977	0.0056	0.364
9	14	NLP	Natural Language Processing	1965	Denis M. Manelski, Gilbert K. Krulee	C65-1018	46,094	0.0015	14,243	0.170	40	14	3.24	6,978	1,946	0.0026	0.359
10	146	LSTM		1999	Felix A. Gers, Fred Cummins, Juergen Schmidhuber	e99_93	68,445	0.0022	7,090	0.085	23	70	9.65	13,767	1,934	0.0051	0.356
12	3	Subset	Sub set, sub sets, sub-set, sub-sets, subsets	1965	Denis M. Manelski, E. D. Pendergraft, Gilbert K. Krulee, Itiroo Sakai, N. Dale, Wojciech Skalmowski	C65-1006 C65-1018 C65-1021 C65-1025	65,243	0.0021	24,171	0.288	26	29	2.70	5,239	1,913	0.0020	0.353
14	4	Classifier	Classifiers	1967	Aravind K. Joshi, Danuta Hiz	C67-1007	143,885	0.0045	18,540	0.221	7	13	7.76	11,125	1,847	0.0042	0.340
24	5	SR	ASR, ASRs, Automatic Speech Recognition, Speech Recognition, automatic speech recognition, speech recognition	1965	Denis M. Manelski, Dániel Várga, Gilbert K. Krulee, Makoto Nagao, Toshiyuki Sakai	C65-1018 C65-1022 C65-1029	179,579	0.0056	25,916	0.309	3	1	6.93	14,630	1,423	0.0055	0.262
27	10	Optimization	Optimization, optimisations, optimizations	1967	Ellis B. Page	C67-1032	48,412	0.0015	15,221	0.182	36	13	3.18	3,514	1,356	0.0013	0.250
33	8	POS	POSs, Part Of Speech, Part of Speech, Part-Of-Speech, Part-of-Speech, Parts Of Speech, Parts of Speech, Pos, part of speech, part-of-speech, parts of speech, parts-of-speech	1965	Denis M. Manelski, Dániel Várga, Gilbert K. Krulee, Makoto Nagao, Toshiyuki Sakai	C65-1018 C65-1022 C65-1029	135,022	0.0042	18,946	0.226	8	14	7.13	7,278	1,158	0.0027	0.213