Benchmarking PubMed Central
General
This is the end-to-end benchmarking result for GROBID version 0.7.3 against the PMC_sample_1943 dataset, see the End-to-end evaluation page for explanations and for reproducing this evaluation.
The following end-to-end results are using:
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BidLSTM_ChainCRF_FEATURES as sequence labeling for the header model
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BidLSTM_ChainCRF_FEATURES as sequence labeling for the reference-segmenter model
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BidLSTM-CRF-FEATURES as sequence labeling for the citation model
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BidLSTM_CRF_FEATURES as sequence labeling for the affiliation-address model
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CRF Wapiti as sequence labelling engine for all other models.
Header extractions are consolidated by default with biblio-glutton service (the results with CrossRef REST API as consolidation service should be similar but much slower).
Other versions of these benchmarks with variants and Deep Learning models (e.g. newer master snapshots) are available here. Note that Deep Learning models might provide higher accuracy, but at the cost of slower runtime and more expensive CPU/GPU resources.
Evaluation on 1943 random PDF PMC files out of 1943 PDF from 1943 different journals (0 PDF parsing failure).
Runtime for processing 1943 PDF: 2871s (1.4s per PDF) on Ubuntu 16.04, 4 CPU i7-4790K (8 threads), 16GB RAM (workstation bought in 2015 for 1600 euros) and with a GeForce GTX 1050 Ti GPU.
Note: with CRF only models, runtime is 470s (0.24 seconds per PDF).
Header metadata
Evaluation on 1943 random PDF files out of 1943 PDF (ratio 1.0).
Strict Matching (exact matches)
Field-level results
| label | precision | recall | f1 | support |
|---|---|---|---|---|
| abstract | 16.78 | 16.48 | 16.63 | 1911 |
| authors | 89.99 | 89.9 | 89.95 | 1941 |
| first_author | 96.65 | 96.55 | 96.6 | 1941 |
| keywords | 64.99 | 63.62 | 64.3 | 1380 |
| title | 85.39 | 85.13 | 85.26 | 1943 |
| all fields (micro avg.) | 71.5 | 70.93 | 71.22 | 9116 |
| all fields (macro avg.) | 70.76 | 70.34 | 70.55 | 9116 |
Soft Matching (ignoring punctuation, case and space characters mismatches)
Field-level results
| label | precision | recall | f1 | support |
|---|---|---|---|---|
| abstract | 63.83 | 62.69 | 63.25 | 1911 |
| authors | 90.87 | 90.78 | 90.82 | 1941 |
| first_author | 96.85 | 96.75 | 96.8 | 1941 |
| keywords | 73.65 | 72.1 | 72.87 | 1380 |
| title | 93.86 | 93.57 | 93.71 | 1943 |
| all fields (micro avg.) | 84.61 | 83.93 | 84.27 | 9116 |
| all fields (macro avg.) | 83.81 | 83.18 | 83.49 | 9116 |
Levenshtein Matching (Minimum Levenshtein distance at 0.8)
Field-level results
| label | precision | recall | f1 | support |
|---|---|---|---|---|
| abstract | 91.05 | 89.43 | 90.23 | 1911 |
| authors | 95 | 94.9 | 94.95 | 1941 |
| first_author | 97.06 | 96.96 | 97.01 | 1941 |
| keywords | 84.16 | 82.39 | 83.27 | 1380 |
| title | 98.86 | 98.56 | 98.71 | 1943 |
| all fields (micro avg.) | 93.83 | 93.08 | 93.45 | 9116 |
| all fields (macro avg.) | 93.23 | 92.45 | 92.83 | 9116 |
Ratcliff/Obershelp Matching (Minimum Ratcliff/Obershelp similarity at 0.95)
Field-level results
| label | precision | recall | f1 | support |
|---|---|---|---|---|
| abstract | 87.11 | 85.56 | 86.33 | 1911 |
| authors | 92.88 | 92.79 | 92.84 | 1941 |
| first_author | 96.65 | 96.55 | 96.6 | 1941 |
| keywords | 79.42 | 77.75 | 78.58 | 1380 |
| title | 97.37 | 97.07 | 97.22 | 1943 |
| all fields (micro avg.) | 91.44 | 90.71 | 91.07 | 9116 |
| all fields (macro avg.) | 90.69 | 89.94 | 90.31 | 9116 |
Instance-level results
Total expected instances: 1943
Total correct instances: 220 (strict)
Total correct instances: 881 (soft)
Total correct instances: 1414 (Levenshtein)
Total correct instances: 1272 (ObservedRatcliffObershelp)
Instance-level recall: 11.32 (strict)
Instance-level recall: 45.34 (soft)
Instance-level recall: 72.77 (Levenshtein)
Instance-level recall: 65.47 (RatcliffObershelp)
Citation metadata
Evaluation on 1943 random PDF files out of 1943 PDF (ratio 1.0).
Strict Matching (exact matches)
Field-level results
| label | precision | recall | f1 | support |
|---|---|---|---|---|
| authors | 83.04 | 76.32 | 79.54 | 85778 |
| date | 94.6 | 84.24 | 89.12 | 87067 |
| first_author | 89.78 | 82.49 | 85.98 | 85778 |
| inTitle | 73.22 | 71.87 | 72.54 | 81007 |
| issue | 91.1 | 87.74 | 89.39 | 16635 |
| page | 94.57 | 83.69 | 88.8 | 80501 |
| title | 79.91 | 75.52 | 77.65 | 80736 |
| volume | 96.02 | 89.81 | 92.81 | 80067 |
| all fields (micro avg.) | 87.25 | 80.77 | 83.88 | 597569 |
| all fields (macro avg.) | 87.78 | 81.46 | 84.48 | 597569 |
Soft Matching (ignoring punctuation, case and space characters mismatches)
Field-level results
| label | precision | recall | f1 | support |
|---|---|---|---|---|
| authors | 83.51 | 76.75 | 79.99 | 85778 |
| date | 94.6 | 84.24 | 89.12 | 87067 |
| first_author | 89.95 | 82.65 | 86.15 | 85778 |
| inTitle | 84.92 | 83.34 | 84.13 | 81007 |
| issue | 91.1 | 87.74 | 89.39 | 16635 |
| page | 94.57 | 83.69 | 88.8 | 80501 |
| title | 91.44 | 86.42 | 88.86 | 80736 |
| volume | 96.02 | 89.81 | 92.81 | 80067 |
| all fields (micro avg.) | 90.62 | 83.88 | 87.12 | 597569 |
| all fields (macro avg.) | 90.76 | 84.33 | 87.4 | 597569 |
Levenshtein Matching (Minimum Levenshtein distance at 0.8)
Field-level results
| label | precision | recall | f1 | support |
|---|---|---|---|---|
| authors | 89.22 | 81.99 | 85.45 | 85778 |
| date | 94.6 | 84.24 | 89.12 | 87067 |
| first_author | 90.16 | 82.84 | 86.34 | 85778 |
| inTitle | 86.17 | 84.57 | 85.37 | 81007 |
| issue | 91.1 | 87.74 | 89.39 | 16635 |
| page | 94.57 | 83.69 | 88.8 | 80501 |
| title | 93.8 | 88.65 | 91.15 | 80736 |
| volume | 96.02 | 89.81 | 92.81 | 80067 |
| all fields (micro avg.) | 91.96 | 85.13 | 88.41 | 597569 |
| all fields (macro avg.) | 91.95 | 85.44 | 88.55 | 597569 |
Ratcliff/Obershelp Matching (Minimum Ratcliff/Obershelp similarity at 0.95)
Field-level results
| label | precision | recall | f1 | support |
|---|---|---|---|---|
| authors | 85.99 | 79.03 | 82.36 | 85778 |
| date | 94.6 | 84.24 | 89.12 | 87067 |
| first_author | 89.8 | 82.51 | 86 | 85778 |
| inTitle | 83.49 | 81.94 | 82.71 | 81007 |
| issue | 91.1 | 87.74 | 89.39 | 16635 |
| page | 94.57 | 83.69 | 88.8 | 80501 |
| title | 93.39 | 88.26 | 90.75 | 80736 |
| volume | 96.02 | 89.81 | 92.81 | 80067 |
| all fields (micro avg.) | 91.01 | 84.24 | 87.5 | 597569 |
| all fields (macro avg.) | 91.12 | 84.65 | 87.74 | 597569 |
Instance-level results
Total expected instances: 90125
Total extracted instances: 85893
Total correct instances: 38882 (strict)
Total correct instances: 50895 (soft)
Total correct instances: 55770 (Levenshtein)
Total correct instances: 52316 (RatcliffObershelp)
Instance-level precision: 45.27 (strict)
Instance-level precision: 59.25 (soft)
Instance-level precision: 64.93 (Levenshtein)
Instance-level precision: 60.91 (RatcliffObershelp)
Instance-level recall: 43.14 (strict)
Instance-level recall: 56.47 (soft)
Instance-level recall: 61.88 (Levenshtein)
Instance-level recall: 58.05 (RatcliffObershelp)
Instance-level f-score: 44.18 (strict)
Instance-level f-score: 57.83 (soft)
Instance-level f-score: 63.37 (Levenshtein)
Instance-level f-score: 59.44 (RatcliffObershelp)
Matching 1 : 68320
Matching 2 : 4150
Matching 3 : 1866
Matching 4 : 665
Total matches : 75001
Citation context resolution
Total expected references: 90125 - 46.38 references per article
Total predicted references: 85893 - 44.21 references per article
Total expected citation contexts: 139835 - 71.97 citation contexts per article
Total predicted citation contexts: 115367 - 59.38 citation contexts per article
Total correct predicted citation contexts: 97270 - 50.06 citation contexts per article
Total wrong predicted citation contexts: 18097 (wrong callout matching, callout missing in NLM, or matching with a bib. ref. not aligned with a bib.ref. in NLM)
Precision citation contexts: 84.31
Recall citation contexts: 69.56
fscore citation contexts: 76.23
Fulltext structures
Fulltext structure contents are complicated to capture from JATS NLM files. They are often normalized and different from the actual PDF content and are can be inconsistent from one document to another. The scores of the following metrics are thus not very meaningful in absolute term, in particular for the strict matching (textual content of the srtructure can be very long). As relative values for comparing different models, they seem however useful.
Evaluation on 1943 random PDF files out of 1943 PDF (ratio 1.0).
Strict Matching (exact matches)
Field-level results
| label | precision | recall | f1 | support |
|---|---|---|---|---|
| figure_title | 31.4 | 24.57 | 27.57 | 7281 |
| reference_citation | 57.43 | 58.68 | 58.05 | 134196 |
| reference_figure | 61.2 | 65.88 | 63.45 | 19330 |
| reference_table | 83.01 | 88.39 | 85.62 | 7327 |
| section_title | 76.38 | 67.77 | 71.82 | 27619 |
| table_title | 57.29 | 50.29 | 53.56 | 3971 |
| all fields (micro avg.) | 60.4 | 60.31 | 60.36 | 199724 |
| all fields (macro avg.) | 61.12 | 59.26 | 60.01 | 199724 |
Soft Matching (ignoring punctuation, case and space characters mismatches)
Field-level results
| label | precision | recall | f1 | support |
|---|---|---|---|---|
| figure_title | 78.62 | 61.52 | 69.02 | 7281 |
| reference_citation | 61.68 | 63.03 | 62.35 | 134196 |
| reference_figure | 61.68 | 66.4 | 63.95 | 19330 |
| reference_table | 83.19 | 88.58 | 85.8 | 7327 |
| section_title | 81.23 | 72.08 | 76.38 | 27619 |
| table_title | 81.87 | 71.87 | 76.55 | 3971 |
| all fields (micro avg.) | 65.76 | 65.66 | 65.71 | 199724 |
| all fields (macro avg.) | 74.71 | 70.58 | 72.34 | 199724 |