CloudChaoszero / Theano-PyMC

Theano-PyMC is a fork of the Theano library maintained by the PyMC developers

Aesara is a Python library that allows one to define, optimize, and efficiently evaluate mathematical expressions involving multi-dimensional arrays.

Features

• A hackable, pure-Python codebase
• Extensible graph framework suitable for rapid development of custom operators and symbolic optimizations
• Implements an extensible graph transpilation framework that currently provides compilation via C, JAX, and Numba
• Based on one of the most widely-used Python tensor libraries: Theano

Getting started

import aesara
from aesara import tensor as aet
from aesara.printing import debugprint

# Declare two symbolic floating-point scalars
a = aet.dscalar("a")
b = aet.dscalar("b")

# Create a simple example expression
c = a + b

# Convert the expression into a callable object that takes `(a, b)`
# values as input and computes the value of `c`.
f_c = aesara.function([a, b], c)

assert f_c(1.5, 2.5) == 4.0

# Compute the gradient of the example expression with respect to `a`
dc = aesara.grad(c, a)

f_dc = aesara.function([a, b], dc)

assert f_dc(1.5, 2.5) == 1.0

# Compiling functions with `aesara.function` also optimizes
# expression graphs by removing unnecessary operations and
# replacing computations with more efficient ones.

v = aet.vector("v")
M = aet.matrix("M")

d = a/a + (M + a).dot(v)

debugprint(d)
# Elemwise{add,no_inplace} [id A] ''
#  |InplaceDimShuffle{x} [id B] ''
#  | |Elemwise{true_div,no_inplace} [id C] ''
#  |   |a [id D]
#  |   |a [id D]
#  |dot [id E] ''
#    |Elemwise{add,no_inplace} [id F] ''
#    | |M [id G]
#    | |InplaceDimShuffle{x,x} [id H] ''
#    |   |a [id D]
#    |v [id I]

f_d = aesara.function([a, v, M], d)

# `a/a` -> `1` and the dot product is replaced with a BLAS function
# (i.e. CGemv)
debugprint(f_d)
# Elemwise{Add}[(0, 1)] [id A] ''   5
#  |TensorConstant{(1,) of 1.0} [id B]
#  |CGemv{inplace} [id C] ''   4
#    |AllocEmpty{dtype='float64'} [id D] ''   3
#    | |Shape_i{0} [id E] ''   2
#    |   |M [id F]
#    |TensorConstant{1.0} [id G]
#    |Elemwise{add,no_inplace} [id H] ''   1
#    | |M [id F]
#    | |InplaceDimShuffle{x,x} [id I] ''   0
#    |   |a [id J]
#    |v [id K]
#    |TensorConstant{0.0} [id L]

The documentation is located here.

Installation

The latest release of Aesara can be installed from PyPI using pip:

pip install aesara

Or via conda-forge:

conda install -c conda-forge aesara

The current development branch of Aesara can be installed from GitHub, also using pip:

pip install git+https://github.com/pymc-devs/aesara

For platform-specific installation information see the legacy documentation here.

Support

The PyMC group operates under the NumFOCUS umbrella. If you want to support us financially, donate here.