UserWarnings about variable replacements

[rodluger]

The newest version of aesara is raising thousands of user warnings that look like

/.../aesara/graph/fg.py:500: UserWarning: Variable Elemwise{...}.0 cannot be replaced; it isn't in the FunctionGraph

See here for instance.

@dfm Have you seen this, and any idea what's going on? If not, I'll dig into it.

[rodluger]

Oh-oh, they're thinking of making this an actual exception:

https://github.com/pymc-devs/aesara/blob/37444647688741d925dd299cb81a443e8ceb7c60/aesara/graph/fg.py#L493

Previously this just failed silently:

https://github.com/Theano/Theano/blob/8e9611715b33672d4b65b3fe232988c4adac970a/theano/gof/fg.py#L488

I'm getting this error whenever I call .eval() on a starry tensor. I don't have a proper MWE example yet but the following code

python -c "import starry; starry.Map().flux().eval()" 

warns me

/.../aesara/graph/fg.py:500: UserWarning: Variable argmax cannot be replaced; it isn't in the FunctionGraph
/.../aesara/graph/fg.py:500: UserWarning: Variable LimbDarkOp.1 cannot be replaced; it isn't in the FunctionGraph
/.../aesara/graph/fg.py:500: UserWarning: Variable LimbDarkOp.2 cannot be replaced; it isn't in the FunctionGraph
/.../aesara/graph/fg.py:500: UserWarning: Variable LimbDarkOp.3 cannot be replaced; it isn't in the FunctionGraph

I bet you're going to get these a lot with exoplanet.

[dfm]

Yeah I'm seeing some of these too. I'm not sure what the story is there! Let me know when you find the MWE.

[rodluger]

Ok the MWE is trivial:

import aesara.tensor as tt

y = [0.0, 1.0]
print(tt.max(y).eval())

outputs

/.../aesara/graph/fg.py:500: UserWarning: Variable argmax cannot be replaced; it isn't in the FunctionGraph
1.0

[rodluger]

This certainly seems like a bug in aesara. I filed an issue here: pymc-devs/pytensor#338