Latent space documentation

[punkduckable]

I added documentation (comments + doc strings + type hints + formatting) to latent_space.py

The code is functionally almost identical, save for a few minor tweaks:

Removed the MultiHeadAttention activation function option. This isn't really an activation function, even though it is listed as such in the torch api. It is used to implement an attention layer in a transformer block. It introduces a whole new set of parameters (for the key, query, and value weight matrices) and is really designed to map finite sequences to finite sequences. I do not think it makes sense to include this in the MLP class as an activation option, so I removed it.

Removed apply_attention. Since there is no more multiheadedattention activation option, this function should be removed.

Otherwise, all changes are cosmetic (e.g., comments + formatting).

I also fixed a small bug in gplasdi.py: np.Inf no longer exists. It is deprecated. It has been replaced with np.inf. I fixed this.

[dreamer2368]

This PR will be rebased and merged after PR #11.
There are code conflicts in PR, which happens after other PRs get merged to main branch. Since this is already based on sphinx branch (PR #11), technically it does not have a conflict, only that github does not automatically resolve the past commits. Once PR #11 is merged, rebasing the last 3 commits from the (merged) main branch would not require any editing.