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Is indexing with a variable number of indices supported?

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評估

難度
5/5
預估耗時
一週以上
新手友好度
30/100
Issue 類型
功能
描述清晰度
需要釐清
活躍度
停滯
技術堆疊
rust
領域
data

研究方向

Start by reading ArrayBase::slice() and the s! macro, then compare the requested variable-index behavior with the linked NumPy example. A completed investigation should establish whether ndarray supports the operation, identify a documented workaround or define what support would need to add, and update the linked Stack Overflow answer.

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描述

I'd like to index a tensor along all but the last axis, getting as a result a 1d view of the innermost axis. I thought I'd be able to use ArrayBase::slice() for this, but I need create the index with the s! macro and I can't figure out how to do that with a variable number of indices (such as if the user provides the coordinates of the spatial dimensions in a tensor, and I want to slice on that leaving a 1d view of the feature dimension where the feature dimension is the innermost dimension).

I asked a stack overflow question for this here, if it is indeed supported then perhaps we could add a stack overflow answer there? If not, when would support be added and is there a workaround in the meantime?

The equivalent numpy feature, which is actually slightly more general than my specific use case since I only need a view on the innermost axis, is here

主要語言
Rust
星號
4.3k
分支
391
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