LLM to validate user Query (#365)

Backend Only

backend/danswer/direct_qa/llm_utils.py

@@ -9,8 +9,6 @@
 from danswer.configs.model_configs import GEN_AI_API_KEY
 from danswer.configs.model_configs import GEN_AI_ENDPOINT
 from danswer.configs.model_configs import GEN_AI_HOST_TYPE
-from danswer.configs.model_configs import GEN_AI_MAX_OUTPUT_TOKENS
-from danswer.configs.model_configs import GEN_AI_MODEL_VERSION
 from danswer.configs.model_configs import INTERNAL_MODEL_VERSION
 from danswer.direct_qa.exceptions import UnknownModelError
 from danswer.direct_qa.gpt_4_all import GPT4AllChatCompletionQA
@@ -62,12 +60,10 @@ def get_default_qa_handler(model: str) -> QAHandler:
 
 def get_default_qa_model(
     internal_model: str = INTERNAL_MODEL_VERSION,
-    model_version: str = GEN_AI_MODEL_VERSION,
     endpoint: str | None = GEN_AI_ENDPOINT,
     model_host_type: str | None = GEN_AI_HOST_TYPE,
     api_key: str | None = GEN_AI_API_KEY,
     timeout: int = QA_TIMEOUT,
-    max_output_tokens: int = GEN_AI_MAX_OUTPUT_TOKENS,
     **kwargs: Any,
 ) -> QAModel:
     if not api_key:
@@ -79,16 +75,7 @@ def get_default_qa_model(
     try:
         # un-used arguments will be ignored by the underlying `LLM` class
         # if any args are missing, a `TypeError` will be thrown
-        llm = get_default_llm(
-            model=internal_model,
-            api_key=api_key,
-            model_version=model_version,
-            endpoint=endpoint,
-            model_host_type=model_host_type,
-            timeout=timeout,
-            max_output_tokens=max_output_tokens,
-            **kwargs,
-        )
+        llm = get_default_llm()
         qa_handler = get_default_qa_handler(model=internal_model)
 
         return QABlock(

backend/danswer/direct_qa/qa_block.py

@@ -3,10 +3,7 @@
 from copy import copy
 
 import tiktoken
-from langchain.schema.messages import AIMessage
 from langchain.schema.messages import BaseMessage
-from langchain.schema.messages import HumanMessage
-from langchain.schema.messages import SystemMessage
 
 from danswer.chunking.models import InferenceChunk
 from danswer.direct_qa.interfaces import AnswerQuestionReturn
@@ -19,32 +16,8 @@
 from danswer.direct_qa.qa_prompts import WeakModelFreeformProcessor
 from danswer.direct_qa.qa_utils import process_model_tokens
 from danswer.llm.llm import LLM
-
-
-def _dict_based_prompt_to_langchain_prompt(
-    messages: list[dict[str, str]]
-) -> list[BaseMessage]:
-    prompt: list[BaseMessage] = []
-    for message in messages:
-        role = message.get("role")
-        content = message.get("content")
-        if not role:
-            raise ValueError(f"Message missing `role`: {message}")
-        if not content:
-            raise ValueError(f"Message missing `content`: {message}")
-        elif role == "user":
-            prompt.append(HumanMessage(content=content))
-        elif role == "system":
-            prompt.append(SystemMessage(content=content))
-        elif role == "assistant":
-            prompt.append(AIMessage(content=content))
-        else:
-            raise ValueError(f"Unknown role: {role}")
-    return prompt
-
-
-def _str_prompt_to_langchain_prompt(message: str) -> list[BaseMessage]:
-    return [HumanMessage(content=message)]
+from danswer.llm.utils import dict_based_prompt_to_langchain_prompt
+from danswer.llm.utils import str_prompt_to_langchain_prompt
 
 
 class QAHandler(abc.ABC):
@@ -69,7 +42,7 @@ class JsonChatQAHandler(QAHandler):
     def build_prompt(
         self, query: str, context_chunks: list[InferenceChunk]
     ) -> list[BaseMessage]:
-        return _dict_based_prompt_to_langchain_prompt(
+        return dict_based_prompt_to_langchain_prompt(
             JsonChatProcessor.fill_prompt(
                 question=query, chunks=context_chunks, include_metadata=False
             )
@@ -91,7 +64,7 @@ class SimpleChatQAHandler(QAHandler):
     def build_prompt(
         self, query: str, context_chunks: list[InferenceChunk]
     ) -> list[BaseMessage]:
-        return _str_prompt_to_langchain_prompt(
+        return str_prompt_to_langchain_prompt(
             WeakModelFreeformProcessor.fill_prompt(
                 question=query,
                 chunks=context_chunks,

backend/danswer/llm/build.py

@@ -1,16 +1,36 @@
 from typing import Any
 
+from danswer.configs.app_configs import QA_TIMEOUT
 from danswer.configs.constants import DanswerGenAIModel
 from danswer.configs.model_configs import API_TYPE_OPENAI
+from danswer.configs.model_configs import GEN_AI_API_KEY
+from danswer.configs.model_configs import GEN_AI_ENDPOINT
+from danswer.configs.model_configs import GEN_AI_HOST_TYPE
+from danswer.configs.model_configs import GEN_AI_MAX_OUTPUT_TOKENS
+from danswer.configs.model_configs import GEN_AI_MODEL_VERSION
+from danswer.configs.model_configs import INTERNAL_MODEL_VERSION
 from danswer.llm.azure import AzureGPT
 from danswer.llm.llm import LLM
 from danswer.llm.openai import OpenAIGPT
 
 
-def get_default_llm(model: str, **kwargs: Any) -> LLM:
+def get_llm_from_model(model: str, **kwargs: Any) -> LLM:
     if model == DanswerGenAIModel.OPENAI_CHAT.value:
         if API_TYPE_OPENAI == "azure":
             return AzureGPT(**kwargs)
         return OpenAIGPT(**kwargs)
 
     raise ValueError(f"Unknown LLM model: {model}")
+
+
+def get_default_llm(**kwargs: Any) -> LLM:
+    return get_llm_from_model(
+        model=INTERNAL_MODEL_VERSION,
+        api_key=GEN_AI_API_KEY,
+        model_version=GEN_AI_MODEL_VERSION,
+        endpoint=GEN_AI_ENDPOINT,
+        model_host_type=GEN_AI_HOST_TYPE,
+        timeout=QA_TIMEOUT,
+        max_output_tokens=GEN_AI_MAX_OUTPUT_TOKENS,
+        **kwargs,
+    )

backend/danswer/llm/utils.py

@@ -2,37 +2,65 @@
 
 from langchain.prompts.base import StringPromptValue
 from langchain.prompts.chat import ChatPromptValue
-from langchain.schema import (
-    PromptValue,
-)
+from langchain.schema import PromptValue
 from langchain.schema.language_model import LanguageModelInput
+from langchain.schema.messages import AIMessage
+from langchain.schema.messages import BaseMessage
 from langchain.schema.messages import BaseMessageChunk
+from langchain.schema.messages import HumanMessage
+from langchain.schema.messages import SystemMessage
 
 from danswer.configs.app_configs import LOG_LEVEL
 
 
+def dict_based_prompt_to_langchain_prompt(
+    messages: list[dict[str, str]]
+) -> list[BaseMessage]:
+    prompt: list[BaseMessage] = []
+    for message in messages:
+        role = message.get("role")
+        content = message.get("content")
+        if not role:
+            raise ValueError(f"Message missing `role`: {message}")
+        if not content:
+            raise ValueError(f"Message missing `content`: {message}")
+        elif role == "user":
+            prompt.append(HumanMessage(content=content))
+        elif role == "system":
+            prompt.append(SystemMessage(content=content))
+        elif role == "assistant":
+            prompt.append(AIMessage(content=content))
+        else:
+            raise ValueError(f"Unknown role: {role}")
+    return prompt
+
+
+def str_prompt_to_langchain_prompt(message: str) -> list[BaseMessage]:
+    return [HumanMessage(content=message)]
+
+
 def message_generator_to_string_generator(
     messages: Iterator[BaseMessageChunk],
 ) -> Iterator[str]:
     for message in messages:
         yield message.content
 
 
-def convert_input(input: LanguageModelInput) -> str:
+def convert_input(lm_input: LanguageModelInput) -> str:
     """Heavily inspired by:
     https://github.com/langchain-ai/langchain/blob/master/libs/langchain/langchain/chat_models/base.py#L86
     """
     prompt_value = None
-    if isinstance(input, PromptValue):
-        prompt_value = input
-    elif isinstance(input, str):
-        prompt_value = StringPromptValue(text=input)
-    elif isinstance(input, list):
-        prompt_value = ChatPromptValue(messages=input)
+    if isinstance(lm_input, PromptValue):
+        prompt_value = lm_input
+    elif isinstance(lm_input, str):
+        prompt_value = StringPromptValue(text=lm_input)
+    elif isinstance(lm_input, list):
+        prompt_value = ChatPromptValue(messages=lm_input)
 
     if prompt_value is None:
         raise ValueError(
-            f"Invalid input type {type(input)}. "
+            f"Invalid input type {type(lm_input)}. "
             "Must be a PromptValue, str, or list of BaseMessages."
         )
 

backend/danswer/secondary_llm_flows/query_validation.py

@@ -0,0 +1,107 @@
+import re
+from collections.abc import Iterator
+from dataclasses import asdict
+
+from danswer.direct_qa.interfaces import DanswerAnswerPiece
+from danswer.direct_qa.qa_block import dict_based_prompt_to_langchain_prompt
+from danswer.llm.build import get_default_llm
+from danswer.server.models import QueryValidationResponse
+from danswer.server.utils import get_json_line
+
+REASONING_PAT = "REASONING: "
+ANSWERABLE_PAT = "ANSWERABLE: "
+COT_PAT = "\nLet's think step by step"
+
+
+def get_query_validation_messages(user_query: str) -> list[dict[str, str]]:
+    messages = [
+        {
+            "role": "system",
+            "content": f"You are a helper tool to determine if a query is answerable using retrieval augmented "
+            f"generation. A system will try to answer the user query based on ONLY the top 5 most relevant "
+            f"documents found from search. Sources contain both up to date and proprietary information for "
+            f"the specific team. For named or unknown entities, assume the search will always find "
+            f"consistent knowledge about the entity. Determine if that system should attempt to answer. "
+            f'"{ANSWERABLE_PAT}" must be exactly "True" or "False"',
+        },
+        {"role": "user", "content": "What is this Slack channel about?"},
+        {
+            "role": "assistant",
+            "content": f"{REASONING_PAT}First the system must determine which Slack channel is being referred to."
+            f"By fetching 5 documents related to Slack channel contents, it is not possible to determine"
+            f"which Slack channel the user is referring to.\n{ANSWERABLE_PAT}False",
+        },
+        {
+            "role": "user",
+            "content": f"Danswer is unreachable.{COT_PAT}",
+        },
+        {
+            "role": "assistant",
+            "content": f"{REASONING_PAT}The system searches documents related to Danswer being "
+            f"unreachable. Assuming the documents from search contains situations where Danswer is not "
+            f"reachable and contains a fix, the query is answerable.\n{ANSWERABLE_PAT}True",
+        },
+        {"role": "user", "content": f"How many customers do we have?{COT_PAT}"},
+        {
+            "role": "assistant",
+            "content": f"{REASONING_PAT}Assuming the searched documents contains customer acquisition information"
+            f"including a list of customers, the query can be answered.\n{ANSWERABLE_PAT}True",
+        },
+        {"role": "user", "content": user_query + COT_PAT},
+    ]
+
+    return messages
+
+
+def extract_answerability_reasoning(model_raw: str) -> str:
+    reasoning_match = re.search(
+        f"{REASONING_PAT}(.*?){ANSWERABLE_PAT}", model_raw, re.DOTALL
+    )
+    reasoning_text = reasoning_match.group(1).strip() if reasoning_match else ""
+    return reasoning_text
+
+
+def extract_answerability_bool(model_raw: str) -> bool:
+    answerable_match = re.search(f"{ANSWERABLE_PAT}(.+)", model_raw)
+    answerable_text = answerable_match.group(1).strip() if answerable_match else ""
+    answerable = True if answerable_text.strip().lower() in ["true", "yes"] else False
+    return answerable
+
+
+def get_query_answerability(user_query: str) -> tuple[str, bool]:
+    messages = get_query_validation_messages(user_query)
+    filled_llm_prompt = dict_based_prompt_to_langchain_prompt(messages)
+    model_output = get_default_llm().invoke(filled_llm_prompt)
+
+    reasoning = extract_answerability_reasoning(model_output)
+    answerable = extract_answerability_bool(model_output)
+
+    return reasoning, answerable
+
+
+def stream_query_answerability(user_query: str) -> Iterator[str]:
+    messages = get_query_validation_messages(user_query)
+    filled_llm_prompt = dict_based_prompt_to_langchain_prompt(messages)
+    tokens = get_default_llm().stream(filled_llm_prompt)
+    reasoning_pat_found = False
+    model_output = ""
+    for token in tokens:
+        model_output = model_output + token
+
+        if not reasoning_pat_found and REASONING_PAT in model_output:
+            reasoning_pat_found = True
+            remaining = model_output[len(REASONING_PAT) :]
+            if remaining:
+                yield get_json_line(asdict(DanswerAnswerPiece(answer_piece=remaining)))
+            continue
+
+        if reasoning_pat_found:
+            yield get_json_line(asdict(DanswerAnswerPiece(answer_piece=token)))
+
+    reasoning = extract_answerability_reasoning(model_output)
+    answerable = extract_answerability_bool(model_output)
+
+    yield get_json_line(
+        QueryValidationResponse(reasoning=reasoning, answerable=answerable).dict()
+    )
+    return

backend/danswer/server/models.py

@@ -151,6 +151,11 @@ class SearchFeedbackRequest(BaseModel):
     search_feedback: SearchFeedbackType
 
 
+class QueryValidationResponse(BaseModel):
+    reasoning: str
+    answerable: bool
+
+
 class SearchResponse(BaseModel):
     # For semantic search, top docs are reranked, the remaining are as ordered from retrieval
     top_ranked_docs: list[SearchDoc] | None

backend/danswer/server/search_backend.py

@@ -1,4 +1,3 @@
-import json
 from collections.abc import Generator
 from dataclasses import asdict
 
@@ -29,12 +28,16 @@
 from danswer.search.models import SearchType
 from danswer.search.semantic_search import chunks_to_search_docs
 from danswer.search.semantic_search import retrieve_ranked_documents
+from danswer.secondary_llm_flows.query_validation import get_query_answerability
+from danswer.secondary_llm_flows.query_validation import stream_query_answerability
 from danswer.server.models import HelperResponse
 from danswer.server.models import QAFeedbackRequest
 from danswer.server.models import QAResponse
+from danswer.server.models import QueryValidationResponse
 from danswer.server.models import QuestionRequest
 from danswer.server.models import SearchFeedbackRequest
 from danswer.server.models import SearchResponse
+from danswer.server.utils import get_json_line
 from danswer.utils.logger import setup_logger
 from danswer.utils.timing import log_generator_function_time
 
@@ -43,10 +46,6 @@
 router = APIRouter()
 
 
-def get_json_line(json_dict: dict) -> str:
-    return json.dumps(json_dict) + "\n"
-
-
 @router.get("/search-intent")
 def get_search_type(
     question: QuestionRequest = Depends(), _: User = Depends(current_user)
@@ -56,6 +55,25 @@ def get_search_type(
     return recommend_search_flow(query, use_keyword)
 
 
+@router.get("/query-validation")
+def query_validation(
+    question: QuestionRequest = Depends(), _: User = Depends(current_user)
+) -> QueryValidationResponse:
+    query = question.query
+    reasoning, answerable = get_query_answerability(query)
+    return QueryValidationResponse(reasoning=reasoning, answerable=answerable)
+
+
+@router.get("/stream-query-validation")
+def stream_query_validation(
+    question: QuestionRequest = Depends(), _: User = Depends(current_user)
+) -> StreamingResponse:
+    query = question.query
+    return StreamingResponse(
+        stream_query_answerability(query), media_type="application/json"
+    )
+
+
 @router.post("/semantic-search")
 def semantic_search(
     question: QuestionRequest,