Init ServiceRetriever Class

[xpbowler]

Pull Request Checklist

ServiceRetriever class for interacting with Anserini REST API. Currently only supports retrieval from pre-built indexes and k=10 (REST API does not accept k as a parameter currently).

Class variables:

• host
• dataset name (dataset)
• retrieval_mode (only DATASET is valid at the moment)
• retrieval_method (e.g., BM25)

from_dataset_with_prebuilt_index() takes in:

• request
• dataset_name
• retrieval_method
• k Anserini API currently does not support passing in k
• host Defaults to localhost::8081

PR Type

• [x] Feature