v5.0.0

What's Changed

In this major release we are switching our graph computation backend from Aesara to PyTensor, which is a fork of Aesara under PyMC governance.
Read the full announcement here: PyMC is Forking Aesara to PyTensor.

The switch itself should be rather seamless and you can probably just update your imports:

import aesara.tensor as at       # old (pymc >=4,< 5)
import pytensor.tensor as pt     # new (pymc >=5)

If you encounter problems updating please check the latest Discussions and don't hesitate to get in touch.

Major Changes 🛠

• ⚠ Switched the graph backend from Aesara to PyTensor
• Merged AePPL into a new logprob submodule. Dispatch methods can be found in logprob.abstract
• ⚠ The log_likelihood, needed for arviz.compare is no longer computed by default. It can be added with idata = pm.compute_log_likelihood(idata) or using pm.sample(idata_kwargs=dict(log_likelihood=True)) by @ricardoV94 in #6374
• Changed Minibatch API by @ferrine in #6304
• Fix ordering transformation for batched dimensions, and deprecate in favor of univariate_ordered and multivariate_ordered by @TimOliverMaier in #6255 and @ricardoV94 in #6375

New Features & Bugfixes 🎉

• Support logp derivation in DensityDist when random function returns a PyTensor variable by @ricardoV94 in #6361
• Added alternative parametrization for AsymmetricLaplace by @aloctavodia in #6337

Docs & Maintenance 🔧

• Bugfixes to increase robustness against unnamed dims by @michaelosthege in #6339
• Updated GOVERNANCE.md by @canyon289 in #6358
• Fixed overriding user provided mp_ctx strings to pm.sample() on M1 MacOS by @digicosmos86 in #6363
• Simplify measurable transform rewrites by @ricardoV94 in #6370
• Fix measurable stack and join with interdependent inputs by @ricardoV94 in #6342
• Allow transforms to work with multiple-valued nodes by @ricardoV94 in #6341
• Fix transformed Scan values by @ricardoV94 in #6343
• Add issue templates by @ferrine in #6327
• Fail docs build on errors in core notebooks by @michaelosthege in #6324
• Curated ecosystem references by @michaelosthege in #6383
• Switched run_mypy.py from pass-listing to fail-listing by @michaelosthege in #6381
• Runing pydocstyle in pre-commit by @michaelosthege in #6382
• Removed NoDistribution from docs by @stestoll in #6316
• Fix transforms example by @ricardoV94 in #6333

New Contributors

• @digicosmos86 made their first contribution in #6363

Full Changelog: v4.4.0...v5.0.0