Versioning Issues

Pytorch version

This issue is related to https://github.com/pytorch/rl/issues/689. Using PyTorch versions <2.0 and installing stable package leads to undefined symbol errors. For example:

ImportError: /usr/local/lib/python3.7/dist-packages/torchrl/_torchrl.so: undefined symbol: _ZN8pybind116detail11type_casterIN2at6TensorEvE4loadENS_6handleEb

How to reproduce

1. Create an Colab Notebook (at 24/11/2022 Colab enviroment has Python 3.7 and Pytorch 1.12 installed by default).

2. !pip install torchrl

3. import torchrl

In Colab you can solve the issue by running:

!pip3 install torch --extra-index-url https://download.pytorch.org/whl/cpu -U

before the !pip install torchrl command. This will install the latest pytorch. Instructions can be found here.

Workarounds

There are two workarounds to this issue

1. Install/upgrade to the latest pytorch release before installing torchrl.

2. If you need to use a previous pytorch relase: Install functorch version related to your torch distribution: e.g. pip install functorch==0.2.0 and install library from source pip install git+https://github.com/pytorch/rl@<lib_version_here>.