allow additional features in embedding #204
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Description
This PR adds a new feature that will allow to embed additional per-atom (e.g. partial charge, spin) and per-system properties (e.g. total charge). The approach is similar to what is outlined in this PR.
The idea is to construct a feature vector containing nuclear charges and appending other per-system or per-atom properties, mixing these properties in a linear layer that will return a tensor that is then passed to the embedding layer. This doesn't require any change to the current architecture of the models.
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