community[patch], langchain[minor]: Add retriever self_query and scor…

…e_threshold in DingoDB (langchain-ai#18106)

libs/community/langchain_community/vectorstores/dingo.py

@@ -145,7 +145,7 @@ def similarity_search(
             List of Documents most similar to the query and score for each
         """
         docs_and_scores = self.similarity_search_with_score(
-            query, k=k, search_params=search_params
+            query, k=k, search_params=search_params, **kwargs
         )
         return [doc for doc, _ in docs_and_scores]
 
@@ -177,9 +177,15 @@ def similarity_search_with_score(
             return []
 
         for res in results[0]["vectorWithDistances"]:
+            score = res["distance"]
+            if (
+                "score_threshold" in kwargs
+                and kwargs.get("score_threshold") is not None
+            ):
+                if score > kwargs.get("score_threshold"):
+                    continue
             metadatas = res["scalarData"]
             id = res["id"]
-            score = res["distance"]
             text = metadatas[self._text_key]["fields"][0]["data"]
             metadata = {"id": id, "text": text, "score": score}
             for meta_key in metadatas.keys():

libs/langchain/langchain/retrievers/self_query/base.py

@@ -7,6 +7,7 @@
     Chroma,
     DashVector,
     DeepLake,
+    Dingo,
     ElasticsearchStore,
     Milvus,
     MongoDBAtlasVectorSearch,
@@ -39,6 +40,7 @@
 from langchain.retrievers.self_query.chroma import ChromaTranslator
 from langchain.retrievers.self_query.dashvector import DashvectorTranslator
 from langchain.retrievers.self_query.deeplake import DeepLakeTranslator
+from langchain.retrievers.self_query.dingo import DingoDBTranslator
 from langchain.retrievers.self_query.elasticsearch import ElasticsearchTranslator
 from langchain.retrievers.self_query.milvus import MilvusTranslator
 from langchain.retrievers.self_query.mongodb_atlas import MongoDBAtlasTranslator
@@ -65,6 +67,7 @@ def _get_builtin_translator(vectorstore: VectorStore) -> Visitor:
         Pinecone: PineconeTranslator,
         Chroma: ChromaTranslator,
         DashVector: DashvectorTranslator,
+        Dingo: DingoDBTranslator,
         Weaviate: WeaviateTranslator,
         Vectara: VectaraTranslator,
         Qdrant: QdrantTranslator,

libs/langchain/langchain/retrievers/self_query/dingo.py

@@ -0,0 +1,49 @@
+from typing import Tuple, Union
+
+from langchain.chains.query_constructor.ir import (
+    Comparator,
+    Comparison,
+    Operation,
+    Operator,
+    StructuredQuery,
+    Visitor,
+)
+
+
+class DingoDBTranslator(Visitor):
+    """Translate `DingoDB` internal query language elements to valid filters."""
+
+    allowed_comparators = (
+        Comparator.EQ,
+        Comparator.NE,
+        Comparator.LT,
+        Comparator.LTE,
+        Comparator.GT,
+        Comparator.GTE,
+    )
+    """Subset of allowed logical comparators."""
+    allowed_operators = (Operator.AND, Operator.OR)
+    """Subset of allowed logical operators."""
+
+    def _format_func(self, func: Union[Operator, Comparator]) -> str:
+        self._validate_func(func)
+        return f"${func.value}"
+
+    def visit_operation(self, operation: Operation) -> Operation:
+        return operation
+
+    def visit_comparison(self, comparison: Comparison) -> Comparison:
+        return comparison
+
+    def visit_structured_query(
+        self, structured_query: StructuredQuery
+    ) -> Tuple[str, dict]:
+        if structured_query.filter is None:
+            kwargs = {}
+        else:
+            kwargs = {
+                "search_params": {
+                    "langchain_expr": structured_query.filter.accept(self)
+                }
+            }
+        return structured_query.query, kwargs

libs/langchain/tests/unit_tests/retrievers/self_query/test_dingo.py

@@ -0,0 +1,99 @@
+from typing import Dict, Tuple
+
+from langchain.chains.query_constructor.ir import (
+    Comparator,
+    Comparison,
+    Operation,
+    Operator,
+    StructuredQuery,
+)
+from langchain.retrievers.self_query.dingo import DingoDBTranslator
+
+DEFAULT_TRANSLATOR = DingoDBTranslator()
+
+
+def test_visit_comparison() -> None:
+    comp = Comparison(comparator=Comparator.LT, attribute="foo", value=["1", "2"])
+    expected = Comparison(comparator=Comparator.LT, attribute="foo", value=["1", "2"])
+    actual = DEFAULT_TRANSLATOR.visit_comparison(comp)
+    assert expected == actual
+
+
+def test_visit_operation() -> None:
+    op = Operation(
+        operator=Operator.AND,
+        arguments=[
+            Comparison(comparator=Comparator.LT, attribute="foo", value=2),
+            Comparison(comparator=Comparator.EQ, attribute="bar", value="baz"),
+        ],
+    )
+    expected = Operation(
+        operator=Operator.AND,
+        arguments=[
+            Comparison(comparator=Comparator.LT, attribute="foo", value=2),
+            Comparison(comparator=Comparator.EQ, attribute="bar", value="baz"),
+        ],
+    )
+    actual = DEFAULT_TRANSLATOR.visit_operation(op)
+    assert expected == actual
+
+
+def test_visit_structured_query() -> None:
+    query = "What is the capital of France?"
+
+    structured_query = StructuredQuery(
+        query=query,
+        filter=None,
+    )
+    expected: Tuple[str, Dict] = (query, {})
+    actual = DEFAULT_TRANSLATOR.visit_structured_query(structured_query)
+    assert expected == actual
+
+    comp = Comparison(comparator=Comparator.LT, attribute="foo", value=["1", "2"])
+    structured_query = StructuredQuery(
+        query=query,
+        filter=comp,
+    )
+    expected = (
+        query,
+        {
+            "search_params": {
+                "langchain_expr": Comparison(
+                    comparator=Comparator.LT, attribute="foo", value=["1", "2"]
+                )
+            }
+        },
+    )
+    actual = DEFAULT_TRANSLATOR.visit_structured_query(structured_query)
+    assert expected == actual
+
+    op = Operation(
+        operator=Operator.AND,
+        arguments=[
+            Comparison(comparator=Comparator.LT, attribute="foo", value=2),
+            Comparison(comparator=Comparator.EQ, attribute="bar", value="baz"),
+        ],
+    )
+    structured_query = StructuredQuery(
+        query=query,
+        filter=op,
+    )
+    expected = (
+        query,
+        {
+            "search_params": {
+                "langchain_expr": Operation(
+                    operator=Operator.AND,
+                    arguments=[
+                        Comparison(comparator=Comparator.LT, attribute="foo", value=2),
+                        Comparison(
+                            comparator=Comparator.EQ, attribute="bar", value="baz"
+                        ),
+                    ],
+                )
+            }
+        },
+    )
+
+    actual = DEFAULT_TRANSLATOR.visit_structured_query(structured_query)
+    assert expected == actual