Get Tensor from Image

[Kadazzz]

It is necessary to query the tensor in the database and I see you've prepared a getItemDataByKey in the 'databasemanager' but there is no gRPC call linked, if you have not done it before me I might make a pull request.

Also, would it be possible to have string as keys/id, it would be easier if we had image names as keys instead of arbitrarily giving integer ids.

Thank you for doing this project.

[perone]

Hi @KillianPls, when you say "query the tensor in the database" you mean to get the feature vectors from an item ID ? If yes, then it really makes sense and as you mentioned the getItemDataByKey is definitely there for it, a PR for that is welcome !
Regarding the string keys/ids, it's really difficult because some indexes only support integers (such as annoy for instance), and there is another issue that is related to the memory efficiency, because if you want to translate that back to these indexes in O(1), you'll need a hash table with string->int for every item and this is not memory efficient. The users can keep this information locally or even in the metadata if they want to save the name of the item.