Replace at -> pt.

[twiecki]

Following #481, now also renaming at->pt. This is the script:

#!/bin/bash

if [ -z "$1" ]
  then
    echo "Script to automatically convert code (*.py and *.ipynb) from PyMC3 to 4.0. Use with care."
    echo "Usage: pymc3_to_4.sh <path>"
    exit 1
fi

declare -a replace_strings=(
    "s/import pytensor\.tensor as at/import pytensor.tensor as pt/g"
     #"s/tt\./pt./g"
     "s/at\./pt./g"
)

for replace in "${replace_strings[@]}"; do
    find $1 -name "*.ipynb" -type f -exec sed -i -e "/png/n;/stat/n;/that/n;$replace" {} \;
done

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[Armavica]

Also this

[drbenvincent]

Can probably change (or remove) these lines in rerun.py

"from theano import tensor as tt": "import aesara.tensor as at",
"import theano.tensor as tt": "import aesara.tensor as at",
"theano": "aesara",
"Theano": "Aesara",
"tt.": "at.",
"aet": "at",

[drbenvincent]

There's also this in conf.py

intersphinx_mapping = {
    "aesara": ("https://aesara.readthedocs.io/en/latest/", None),

and this in .pre-commit-config.yaml

      entry: >
          (?x)(arviz-devs.github.io|
               aesara.readthedocs.io|

[OriolAbril]

left minor comment, other than that looks good. But I have not gone through the replaces carefully, only skimming

[OriolAbril]

We should remove aesara from this dict and replace it with pytensor instead of adding pytensor. Same goes for the pre-commit config