PR welcomegood first issue
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Currently tracing the gradient through take is not supported:
import numpy as np
import autograd as ag
import autograd.numpy as anp
rng = np.random.default_rng(42)
x = rng.uniform(size=(3, 4, 5))
idx = rng.integers(0, 4, size=(6,))
def foo(x, idx):
# # works:
# return x[:, idx, :].sum()
# # doesn't work:
return anp.take(x, idx, axis=1).sum()
gfoo = ag.grad(foo, argnum=0)
gfoo(x, rng.integers(0, 4, size=(6,))).shape
# NotImplementedError: VJP of take wrt argnums (0,) not defined
take is mostly just a convenient syntax/subset of getitem indexing, so I suppose there is nothing fundamentally blocking it.