Chaojun Zhang

add substrait extension yaml files for further function registry

5

copy substrait extension yaml files from https://github.com/substrait-io/substrait/tree/main/extensions for further function registry

**what changes** - add single value series for primitive type - primitive support for NumExp, ConstExp - factory method of Accumulator for primitive type **why changes** performance improve **how test**...

See https://github.com/nhl/dflib/issues/138

Refactor doc_loader.py to load documents concurrently using Ray actors or Spark tasks, instead of loading them all at once and then putting them into a dataset

The DocumentIngestion class should not expose the 'rag_framework' property. Instead, it should use the embedding property to decide whether to write the document to a vector database or a regular...

This PR mainly removes GAT from the [graphmask_explainer.py](https://github.com/pyg-team/pytorch_geometric/blob/master/examples/explain/graphmask_explainer.py#L63) example and adds examples for the attention explainer. When I was running [graphmask_explainer.py](https://github.com/pyg-team/pytorch_geometric/blob/master/examples/explain/graphmask_explainer.py#L63) , I encountered the following error:  Referring to...