BUG: Pymc is not compatible with latest pytensor

[PatrickRobotham]

Describe the issue:

I get an import error after installing pytensor and pymc from git.

The issue is that sp_sum now lives in pytensor.sparse.math , not pytensor.sparse.basic

Reproduceable code example:

import pymc

Error message:

File /opt/anaconda3/envs/prophet_v2/lib/python3.13/site-packages/pymc/distributions/multivariate.py:28
     26 from pytensor.graph.op import Op
     27 from pytensor.raise_op import Assert
---> 28 from pytensor.sparse.basic import DenseFromSparse, sp_sum
     29 from pytensor.tensor import (
     30     TensorConstant,
     31     TensorVariable,
   (...)     34     sigmoid,
     35 )
     36 from pytensor.tensor.elemwise import DimShuffle

ImportError: cannot import name 'sp_sum' from 'pytensor.sparse.basic' (/opt/anaconda3/envs/prophet_v2/lib/python3.13/site-packages/pytensor/sparse/basic.py)

PyMC version information:

PyMC: installed with pip 5.26.1+30.g87f80f9d
Pytensor: installed with pip 2.35.1+69.gcc674a119

Context for the issue:

No response

[ricardoV94]

We have explicit pin for the PyTensor dependency and we update PyMC main only when we bump the PyTensor dependency.

Main in PyMC should be compatible with the official dependency