Reject ambiguous axis inference with zero-sized factors - #444
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I noticed that inferring an axis in a composite dimension with a known zero-sized factor currently leaks a raw
ZeroDivisionError, for examplerearrange(x, "(a b) -> a b", a=0).Since
0 * b = 0does not determineb, this raisesEinopsErrorbefore the modulo/division instead. I added tests for invalid inputs and valid empty-tensor cases.I was looking at the same zero-product condition while working on TorchLean, and I can share the formalization too if useful :)