Table 4 Training corpora for patent categorization. C73 has more patents per class with longer text and only primary classification.
From: Automated Patent Categorization and Guided Patent Search using IPC as Inspired by MeSH and PubMed
training corpus | number of patents/class | minimum text length | restricted to primary classification | number of classes | total number of patents |
|---|---|---|---|---|---|
C 73 | 200 | 8000 characters | yes | 73 | 14600 |
C 1205 | 100 | 2000 characters | no | 1205 | 120500 |