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Feat/tta flip subsets - #90
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`tta` now also takes a sequence of flip-axis tuples, for example `[(), (3, 4)]` for the original plus one copy flipped along the anterior-posterior and inferior-superior axes. `True` still averages all 8 flips and `False` turns TTA off, so existing calls behave as before. Also fixes the axis labels in the flip-table comments: after RAS+ reordering axis 2 is left-right, 3 anterior-posterior and 4 inferior-superior.
The PACS container averaged all 8 flips. It now averages 2 passes: the original and one copy flipped anterior-posterior and inferior-superior together, the same flip as the nnU-Net container. On the 344 held-out cases this had as few or fewer false positives than the other 2-flip sets and about the same as all 8 flips, at a quarter of the CPU time. The flip set is recorded in the DICOM DerivationDescription. The single-model path needs fastMONAI 0.11.0 for flip subsets and fails instead of silently running all 8 flips on older versions.
The VS derived DICOM UIDs include the fastMONAI version, so the two golden-UID tests now pin the version they were computed with.
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