# Features

## Contents

AePPL is a flexible collection of tools that allows users to define and manipulate probabilistic models implemented in Aesara.

# Features#

AePPL strives to make probabilistic programming as simple as it should be, and as exhaustive as can be.

**Intuitive:**All you need is an Aesara graph that contains random variables; no need to learn a new syntax**Exhaustive:**If your problem is mathematically well-defined, AePPL is designed to support it.**A broad ecosystem:**Benefit from Aesara’s current and future compilation backends (e.g. C, JAX, Numba). Use your model with other Aesara, Numba or JAX libraries**Flexible:**Define your own distributions by transforming random variables directly; condition on transformed random variables; use loops and conditionals in your model.**Extensible:**Aesara provides tools to easily traverse and transform probabilistic models

# Example#

```
import aeppl
import aesara
import aesara.tensor as at
srng = at.random.RandomStream()
S_rv = srng.invgamma(0.5, 0.5)
Y_rv = srng.normal(0.0, at.sqrt(S_rv))
# Print a LateX representation of the model
aeppl.latex_pprint(Y_rv)
# Compute the joint log-probability for the mixture
logprob, (s_vv, y_vv) = joint_logprob(S_rv, Y_rv)
# Compile to C, Numba or JAX
fn = aesara.function([s_vv, y_vv], logprob)
numba_fn = aesara.function([s_vv, y_vv], logprob, mode="NUMBA")
jax_fn = aesara.function([s_vv, y_vv], logprob, mode="JAX")
```

# Install AePPL#

AePPL installation can happen in a few different ways. You can install AePPL with `conda`

or with `pip`

. To get the bleeding edge version you can install `aeppl-nightly.`

```
pip install aeppl
```

```
conda install -c conda-forge aeppl
```

```
pip install aeppl-nightly
```