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Fixes broadcasting of arrays. #697
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@@ Coverage Diff @@
## master #697 +/- ##
==========================================
+ Coverage 81.37% 81.97% +0.59%
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Files 67 67
Lines 4248 4383 +135
==========================================
+ Hits 3457 3593 +136
+ Misses 791 790 -1
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The rules for broadcasting in `2.4.x` seem to be that singleton
dimension can be stripped from either side. If both is possible
it'll strip from the back, i.e. the dataset with shape `(1, 3, 1)`
can be read into an array of shape `(1, 3)`. This was probably
motivated by `std::vector<std::vector<double>>` of shape `(1, 3)`
is easier to deal with than one that's `(3, 1)`.
However, the stripping from both sides only works for one-dimensional
arrays. Stripping multi-dimensional arrays from either side is unstable
and should be avoided anyway. Hence, we only allow stripping any `1`s
if the target shape is one-dimensional.
This commit achieves the above by:
* introducing `details::squeezeDimensions` which strips the
required amount of singleton dimesions.
* improving `details::checkDimensions` by removing bugs related
to `(3, 1, 1)` not being a valid 2D array.
* Adds (back) tests for checking the broadcasting rules. As well as
`details::checkDimensions` and `details::squeezeDimensions`.
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matz-e
previously approved these changes
Mar 3, 2023
alkino
approved these changes
Mar 7, 2023
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The rules for broadcasting in
2.4.xseem to be that singleton dimension can be stripped from either side. If both is possible it'll strip from the back, i.e. the dataset with shape(1, 3, 1)can be read into an array of shape(1, 3). This was probably motivated bystd::vector<std::vector<double>>of shape(1, 3)is easier to deal with than one that's(3, 1).However, the stripping from both sides only works for one-dimensional arrays. Stripping multi-dimensional arrays from either side is unstable and should be avoided anyway. Hence, we only allow stripping any
1s if the target shape is one-dimensional.This commit achieves the above by:
introducing
details::squeezeDimensionswhich strips the required amount of singleton dimesions.improving
details::checkDimensionsby removing bugs related to(3, 1, 1)not being a valid 2D array.Adds (back) tests for checking the broadcasting rules. As well as
details::checkDimensionsanddetails::squeezeDimensions.