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I am learning this paper in which page11 says

The most well-known, in medical image analysis, of these novel CNN architectures is U-net, published by Ronneberger et al. (2015) (section 2.4.3). The two main architectural novelties in U-net are the combination of an equal amount of upsampling and downsampling lay- ers. Although learned upsampling layers have been pro- posed before, U-net combines them with so-called skip connections between opposing convolution and decon- volution layers. This which concatenate features from the contracting and expanding paths. From a training perspective this means that entire images/scans can be processed by U-net in one forward pass, resulting in a segmentation map directly.

this sentence:

This which concatenate features from the contracting and expanding paths

seems to mean

This (combination) concatenate features from the contracting and expanding paths

it seems that the word "which" does not play a import role in the sentence.

is the sentence a informative expression?

  • Can you edit the link? – Jan May 29 at 11:19
  • The cited text is syntactically invalid. It should read ..and deconvolution layers, which concatenates features from... That's assuming the intended sense is that the concatenation is done / caused by U-net combining "learned upsampling layers" and "so-called skip connections" (a singular subject, referring to something U-net does). If in fact it's the "opposing convolution and deconvolution layers" that do the concatenation (a plural subject), the verb form should be concatenate. In any case, the "unwanted" word is this, not which. – FumbleFingers May 29 at 14:23
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This which concatenate features from the contracting and expanding paths.

This is a sentence fragment with no real meaning. Unfortunately, it is like that even in the original.

However, there is no "this which". There are:

  1. This

  2. which concatenate...

with the meaning that "which concatenate ..." is an explanation about what "this" is.


If I understand the fragment correctly, there is another mistake. The text should be:

This which concatenates

(notice the final "s", 3rd person singular)

or:

These which concatenate

in order to match the count between words (both singular or both plural).

  • Will anyone please explain the downvote? – virolino May 30 at 5:29

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