[MultiThreshold] Generalize data layouts for node execution #143
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This allows node execution of MultiThreshold operators with arbitrary number of dimensions, as long as the channel dimension is last. This is necessary to run some verification steps of attention operators which, at least for some intermediate steps, have 3 dimensional data layouts. This does not change the behavior of execution on the already existing 2d and 4d data layouts.
The relevant aspect of the data layout annotation seems to be which axis is labeled as the channel dimension "C": We do not actually have to care about the total number and ordering of the other axes, as long as we can find the index of the "C" axis and swap to have "C" at index 1 for node execution (and swap it back afterwards). Falls back to the default assumption that "C" is at index 1 if there is no layout annotation, which is equivalent to the "NCHW" or "NC" layouts. This is a rather experimental change which might break existing code and is currently still restricted to the well-known 2-, 3- and 4-dimensional layouts.
As we only really care for the index of the "C" axis there is no need to restrict the set of valid layouts here.
Note: Only covers data layouts for tensors with less than five axes
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The relevant aspect of the data layout annotation seems to be which axis is labeled as the channel dimension "C": We do not actually have to care about the total number and ordering of the other axes, as long as we can find the index of the "C" axis and swap to have "C" at index 1 for node execution (and swap it back afterwards).
Falls back to the default assumption that "C" is at index 1 if there is no layout annotation, which is equivalent to the "NCHW" or "NC" layouts.
This is a rather experimental change which might break existing code and is currently still restricted to the well-known 2-, 3- and 4-dimensional layouts.
This PR is based on #92 which is less experimental and should be merged first (#92 also does not risk breaking existing code as it only adds new special cases).