# Theano/Theano

Theano was a Python library that allows you to define, optimize, and evaluate mathematical expressions involving multi-dimensional arrays efficiently. It is being continued as PyTensor: www.github.com/pymc-devs/pytensor

Repository: https://github.com/Theano/Theano
Canonical: https://ross.abutalabs.com/products/theano
Homepage: https://www.github.com/pymc-devs/pytensor
Language: Python
License: NOASSERTION
License Family: other
Last push: 2024-01-15T03:16:24+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 5502, "days_push": 961, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 9998, forks 2464 (observed 2026-08-28T04:10:39.193054+00:00)

## What it is
Theano is a Python library for defining, optimizing, and efficiently evaluating mathematical expressions involving multi-dimensional arrays. Development has stopped and the project is continued as PyTensor under the PyMC developers.

## Use cases
- define and optimize symbolic mathematical expressions with multi-dimensional arrays
- compile numerical computations to efficient C or GPU code
- build deep learning models with a symbolic graph framework
- serve as a computational backend for probabilistic programming like PyMC
- evaluate array-based math efficiently in Python

## When to choose
- you need a maintained successor - use PyTensor instead
- you are maintaining legacy code that already depends on Theano
- you need a hackable pure-Python symbolic graph framework for custom operators

## When to avoid
- starting a new project - use PyTensor, PyTorch, TensorFlow, or JAX instead
- you need active community support or recent features
- you need modern GPU acceleration or the latest hardware support

## Facets
- artifact type: library
- maturity: abandoned
- function: machine-learning, math, compiler
- domain: machine-learning, deep-learning, mathematics
- platform: python, windows
- tags: symbolic-math, numerical-computation, gpu-computing, pytensor-successor, linux, macos

## Member repositories
- Theano/Theano (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:10:39.193054+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:20:01.306598+00:00, confidence not recorded.
  - readme: https://github.com/Theano/Theano (fetched 2026-08-28T04:10:39.193054+00:00, sha cc1b3586768a)
  - homepage: https://www.github.com/pymc-devs/pytensor (fetched 2026-08-29T08:19:47.725285+00:00, sha 4e389e53559a)
- Data as of 2026-08-30T08:39:29.467469+00:00.