What is the number of patches of each WSIs?

[Tonyboy999]

Some WSIs have only 2048 patches, some have over 40000 patches. In your paper, you used a Squaring method to pad the embeddings to a fixed length. What is the fixed length? If the largest WSI has 50000 patches, did you pad all the embeddings to (1, 50000, 1024) ?

[szc19990412]

We process it at 20x resolution, and we tend to get only about 20,000 patches at most in WSI. For example, if a WSI has only 2048 patches, we will pad the embeddings to (1, 2116, 1024), and if a WSI has 50,000 patches, we will pad the embeddings to (1, 50176, 1024). The amount of padding is determined by the number of patches in the WSI itself.

[Tonyboy999]

Thank you for your reply! But I can't understand your reply.

The amount of padding is determined by the number of patches in the WSI itself. How did you determine the padding with the number of patches in the WSI?

I can't see any logic in padding 2048 -> 2116 and 50000 -> 50176. @szc19990412

[zhiyyyu]

Maybe 2116 means 46*46, and 50176 means 224*224. Later in the PPEG, patch tokens will be reshaped into ( $\sqrt{N}$, $\sqrt{N}$ ).

[HHHedo]

We process it at 20x resolution, and we tend to get only about 20,000 patches at most in WSI. For example, if a WSI has only 2048 patches, we will pad the embeddings to (1, 2116, 1024), and if a WSI has 50,000 patches, we will pad the embeddings to (1, 50176, 1024). The amount of padding is determined by the number of patches in the WSI itself.

Thank you for your reply！ In the process of spatial restoration, did you use the spatial coordinate of patches?