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cmdstanpy

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Velocity0.0

Python interface to CmdStan for Bayesian models

github.com/stan-dev/cmdstanpy ↗

CmdStanPy is clearing deprecations ahead of a 2.0 it keeps announcing.

bayesianstanmcmcdeprecationspython
◆Current state
CmdStanPy is at v1.3.0, which added a diagnose method on CmdStanModel, sampler timing information, create_inits() across the stanfit classes, and much faster MCMC CSV parsing. Every release in this window opens with the same notice: the next non-bugfix release will be 2.0 and will remove existing deprecations. In line with that, 1.3.0 drops Python 3.8 and renames the metric argument to inv_metric.
◆Where it's heading
The package tracks upstream Stan and prepares for its own break. New inference methods arrive as Stan ships them — Laplace with Stan 2.32, Pathfinder with 2.33 — while the interface work is mostly deprecation staging and CSV input-output performance. The repeated 2.0 warning across two years of releases suggests the cut has been deferred more than once.
◆Prediction
The notice at the top of every release points to 2.0 as the next non-bugfix version, removing the deprecations staged here including the metric argument.

◆Recent moves

  1. 9mo ago

    diagnose method, sampler timings and faster CSV parsing

    Adds a diagnose method on CmdStanModel, sampler timing output and create_inits() on the other stanfit classes, alongside notably faster MCMC CSV parsing. Python 3.8 support ends and metric is deprecated in favour of inv_metric, staging the 2.0 break.

    View source ↗
  2. 2y ago

    Fixes from_csv() for CmdStan 2.35 and later

    Two fixes, the substantive one restoring from_csv() for files written by CmdStan 2.35 and later. Keeps output readable after an upstream change.

    View source ↗
  3. 2y ago

    CmdStan 2.35 test fixes and multi-chain profile output

    Test fixes for CmdStan 2.35 and a correction to profile output when several chains run in one process. Maintenance.

    View source ↗
  4. 2y ago

    pyproject.toml build and pathfinder() argument fixes

    Moves the build to pyproject.toml, adds a num_threads argument to pathfinder() and fixes pathfinder() rejecting multiple initial values. Packaging plus two small corrections.

    View source ↗
  5. 2y ago

    New Pathfinder arguments and warmup without adaptation

    Adds new Pathfinder arguments, allows warmup iterations when not adapting, lets draws_pd filter new columns, and fixes unit_e output parsing for Stan 2.34. Follows the upstream Stan release rather than leading it.

    View source ↗
  6. 2y ago

    Laplace method and Pathfinder exposed from upstream Stan

    Exposes two inference methods as Stan ships them — the Laplace method from Stan 2.32 and Pathfinder from 2.33 — and adds chain, iteration and draw columns to draws_pd. Input-output munging moves to an external package.

    View source ↗