Merge pull request #190 from leftfire/main

Reintroduce the ChainOption parameter

chains/retrieval_qa.go

@@ -59,7 +59,7 @@ func NewRetrievalQAFromLLM(llm llms.LanguageModel, retriever schema.Retriever) R
 
 // Call gets relevant documents from the retriever and gives them to the combine
 // documents chain.
-func (c RetrievalQA) Call(ctx context.Context, values map[string]any, _ ...ChainCallOption) (map[string]any, error) { //nolint: lll
+func (c RetrievalQA) Call(ctx context.Context, values map[string]any, options ...ChainCallOption) (map[string]any, error) { //nolint: lll
 	query, ok := values[c.InputKey].(string)
 	if !ok {
 		return nil, fmt.Errorf("%w: %w", ErrInvalidInputValues, ErrInputValuesWrongType)
@@ -73,7 +73,7 @@ func (c RetrievalQA) Call(ctx context.Context, values map[string]any, _ ...Chain
 	result, err := Call(ctx, c.CombineDocumentsChain, map[string]any{
 		"question":        query,
 		"input_documents": docs,
-	})
+	}, options...)
 	if err != nil {
 		return nil, err
 	}