fix: Improve imports for new rankers (#5696)

* Proper imports for new rankers

* Small fix

Author: vblagoje

examples/talk_to_website.py

@@ -5,7 +5,7 @@
 from haystack import Pipeline
 from haystack.document_stores import InMemoryDocumentStore
 from haystack.nodes import PromptNode, PromptTemplate, TopPSampler
-from haystack.nodes.ranker.lost_in_the_middle import LostInTheMiddleRanker
+from haystack.nodes.ranker import LostInTheMiddleRanker
 from haystack.nodes.retriever.web import WebRetriever
 
 search_key = os.environ.get("SERPERDEV_API_KEY")

examples/web_lfqa_with_rankers.py

@@ -4,9 +4,8 @@
 
 from haystack import Pipeline
 from haystack.nodes import PromptNode, PromptTemplate, TopPSampler
-from haystack.nodes.ranker.diversity import DiversityRanker
-from haystack.nodes.ranker.lost_in_the_middle import LostInTheMiddleRanker
-from haystack.nodes.retriever.web import WebRetriever
+from haystack.nodes.ranker import DiversityRanker, LostInTheMiddleRanker
+from haystack.nodes.retriever import WebRetriever
 
 search_key = os.environ.get("SERPERDEV_API_KEY")
 if not search_key:

haystack/nodes/ranker/__init__.py

@@ -1,3 +1,6 @@
 from haystack.nodes.ranker.base import BaseRanker
 from haystack.nodes.ranker.sentence_transformers import SentenceTransformersRanker
 from haystack.nodes.ranker.cohere import CohereRanker
+from haystack.nodes.ranker.lost_in_the_middle import LostInTheMiddleRanker
+from haystack.nodes.ranker.diversity import DiversityRanker
+from haystack.nodes.ranker.recentness_ranker import RecentnessRanker

haystack/nodes/ranker/diversity.py

@@ -2,7 +2,7 @@
 from pathlib import Path
 from typing import List, Literal, Optional, Union
 
-from haystack.nodes import BaseRanker
+from haystack.nodes.ranker.base import BaseRanker
 from haystack.schema import Document
 from haystack.lazy_imports import LazyImport