A Multimodal Retrieval and Ranking Method for Scientific Documents Based on HFS and XLNet

Table 4

Image recognition results of five mathematical expressions.

No.	Images containing the mathematical expression	Recognition result
1		a + b
2		\[S = \pi {r^2}\]
3		x = \frac{{ - b \pm \sqrt {{b^2} - 4ac} }}{{2a}
4		\cos \alpha + \cos \beta = 2\cos \frac{1}{2}\left({\alpha+\beta }\right)\cos\frac{1}{2}\left({\alpha - \beta } \right)
5		\sqrt {ab} \le \frac{{a + b}}{2}