[math] change the internal implementation of surrogate function#562

Merged

chaoming0625 merged 3 commits intomasterfrom

Dec 22, 2023

Commits on Dec 22, 2023

[math] add `brainpy.math.is_bp_array`
chaoming0625
committed
[math] change the internal of surrogate function, add `heaviside_p` primitive, so that all surrogate functions support JVP (forward) and VJP (backward) differentiation
chaoming0625
committed
bug fix
chaoming0625
committed