* implement inverse trig functions
* guess we should still test nans?
* magnitude as variable name :D
* reorder onnx_ops ops
* approximation -> x for consistency
* address feedback
* simpler acos
* improvement?
* actually just have asin depend on atan
* actually this is nicer
* remove a comment
---------
Co-authored-by: chenyu <chenyu@fastmail.com>
* move isinf and isnan to new branch
* sneak a roll documentation fix in
* add to docs
* update test coverage for detect_positive and detect_negative
* add types to isinf args
* move hardsigmoid to new branch
* add to test
* add NOTE to mention differing values for alpha and beta that match torch
* shift from relu6
* correct shift implementation
* or we just use relu? no more 666
