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router_query_engine.py
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router_query_engine.py
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import logging
from typing import Callable, List, Optional, Sequence, Any
from llama_index.core.async_utils import run_async_tasks
from llama_index.core.base.base_query_engine import BaseQueryEngine
from llama_index.core.base.base_retriever import BaseRetriever
from llama_index.core.base.base_selector import BaseSelector
from llama_index.core.base.response.schema import (
RESPONSE_TYPE,
PydanticResponse,
Response,
StreamingResponse,
)
from llama_index.core.bridge.pydantic import BaseModel
from llama_index.core.callbacks.base import CallbackManager
from llama_index.core.callbacks.schema import CBEventType, EventPayload
from llama_index.core.llms.llm import LLM
from llama_index.core.objects.base import ObjectRetriever
from llama_index.core.prompts.default_prompt_selectors import (
DEFAULT_TREE_SUMMARIZE_PROMPT_SEL,
)
from llama_index.core.prompts.mixin import PromptMixinType
from llama_index.core.response_synthesizers import TreeSummarize
from llama_index.core.schema import BaseNode, QueryBundle
from llama_index.core.selectors.utils import get_selector_from_llm
from llama_index.core.service_context import ServiceContext
from llama_index.core.settings import (
Settings,
callback_manager_from_settings_or_context,
llm_from_settings_or_context,
)
from llama_index.core.tools.query_engine import QueryEngineTool
from llama_index.core.tools.types import ToolMetadata
from llama_index.core.utils import print_text
logger = logging.getLogger(__name__)
def combine_responses(
summarizer: TreeSummarize, responses: List[RESPONSE_TYPE], query_bundle: QueryBundle
) -> RESPONSE_TYPE:
"""Combine multiple response from sub-engines."""
logger.info("Combining responses from multiple query engines.")
response_strs = []
source_nodes = []
for response in responses:
if isinstance(response, (StreamingResponse, PydanticResponse)):
response_obj = response.get_response()
else:
response_obj = response
source_nodes.extend(response_obj.source_nodes)
response_strs.append(str(response))
summary = summarizer.get_response(query_bundle.query_str, response_strs)
if isinstance(summary, str):
return Response(response=summary, source_nodes=source_nodes)
elif isinstance(summary, BaseModel):
return PydanticResponse(response=summary, source_nodes=source_nodes)
else:
return StreamingResponse(response_gen=summary, source_nodes=source_nodes)
async def acombine_responses(
summarizer: TreeSummarize, responses: List[RESPONSE_TYPE], query_bundle: QueryBundle
) -> RESPONSE_TYPE:
"""Async combine multiple response from sub-engines."""
logger.info("Combining responses from multiple query engines.")
response_strs = []
source_nodes = []
for response in responses:
if isinstance(response, (StreamingResponse, PydanticResponse)):
response_obj = response.get_response()
else:
response_obj = response
source_nodes.extend(response_obj.source_nodes)
response_strs.append(str(response))
summary = await summarizer.aget_response(query_bundle.query_str, response_strs)
if isinstance(summary, str):
return Response(response=summary, source_nodes=source_nodes)
elif isinstance(summary, BaseModel):
return PydanticResponse(response=summary, source_nodes=source_nodes)
else:
return StreamingResponse(response_gen=summary, source_nodes=source_nodes)
class RouterQueryEngine(BaseQueryEngine):
"""Router query engine.
Selects one out of several candidate query engines to execute a query.
Args:
selector (BaseSelector): A selector that chooses one out of many options based
on each candidate's metadata and query.
query_engine_tools (Sequence[QueryEngineTool]): A sequence of candidate
query engines. They must be wrapped as tools to expose metadata to
the selector.
service_context (Optional[ServiceContext]): A service context.
summarizer (Optional[TreeSummarize]): Tree summarizer to summarize sub-results.
"""
def __init__(
self,
selector: BaseSelector,
query_engine_tools: Sequence[QueryEngineTool],
llm: Optional[LLM] = None,
summarizer: Optional[TreeSummarize] = None,
verbose: bool = False,
# deprecated
service_context: Optional[ServiceContext] = None,
) -> None:
self._llm = llm or llm_from_settings_or_context(Settings, llm)
self._selector = selector
self._query_engines = [x.query_engine for x in query_engine_tools]
self._metadatas = [x.metadata for x in query_engine_tools]
self._summarizer = summarizer or TreeSummarize(
llm=self._llm,
service_context=service_context,
summary_template=DEFAULT_TREE_SUMMARIZE_PROMPT_SEL,
)
self._verbose = verbose
super().__init__(
callback_manager=callback_manager_from_settings_or_context(
Settings, service_context
)
)
def _get_prompt_modules(self) -> PromptMixinType:
"""Get prompt sub-modules."""
# NOTE: don't include tools for now
return {"summarizer": self._summarizer, "selector": self._selector}
@classmethod
def from_defaults(
cls,
query_engine_tools: Sequence[QueryEngineTool],
llm: Optional[LLM] = None,
selector: Optional[BaseSelector] = None,
summarizer: Optional[TreeSummarize] = None,
select_multi: bool = False,
# deprecated
service_context: Optional[ServiceContext] = None,
**kwargs: Any,
) -> "RouterQueryEngine":
llm = llm or llm_from_settings_or_context(Settings, llm)
selector = selector or get_selector_from_llm(llm, is_multi=select_multi)
assert selector is not None
return cls(
selector,
query_engine_tools,
llm=llm,
service_context=service_context,
summarizer=summarizer,
**kwargs,
)
def _query(self, query_bundle: QueryBundle) -> RESPONSE_TYPE:
with self.callback_manager.event(
CBEventType.QUERY, payload={EventPayload.QUERY_STR: query_bundle.query_str}
) as query_event:
result = self._selector.select(self._metadatas, query_bundle)
if len(result.inds) > 1:
responses = []
for i, engine_ind in enumerate(result.inds):
log_str = (
f"Selecting query engine {engine_ind}: " f"{result.reasons[i]}."
)
logger.info(log_str)
if self._verbose:
print_text(log_str + "\n", color="pink")
selected_query_engine = self._query_engines[engine_ind]
responses.append(selected_query_engine.query(query_bundle))
if len(responses) > 1:
final_response = combine_responses(
self._summarizer, responses, query_bundle
)
else:
final_response = responses[0]
else:
try:
selected_query_engine = self._query_engines[result.ind]
log_str = f"Selecting query engine {result.ind}: {result.reason}."
logger.info(log_str)
if self._verbose:
print_text(log_str + "\n", color="pink")
except ValueError as e:
raise ValueError("Failed to select query engine") from e
final_response = selected_query_engine.query(query_bundle)
# add selected result
final_response.metadata = final_response.metadata or {}
final_response.metadata["selector_result"] = result
query_event.on_end(payload={EventPayload.RESPONSE: final_response})
return final_response
async def _aquery(self, query_bundle: QueryBundle) -> RESPONSE_TYPE:
with self.callback_manager.event(
CBEventType.QUERY, payload={EventPayload.QUERY_STR: query_bundle.query_str}
) as query_event:
result = await self._selector.aselect(self._metadatas, query_bundle)
if len(result.inds) > 1:
tasks = []
for i, engine_ind in enumerate(result.inds):
log_str = (
f"Selecting query engine {engine_ind}: " f"{result.reasons[i]}."
)
logger.info(log_str)
if self._verbose:
print_text(log_str + "\n", color="pink")
selected_query_engine = self._query_engines[engine_ind]
tasks.append(selected_query_engine.aquery(query_bundle))
responses = run_async_tasks(tasks)
if len(responses) > 1:
final_response = await acombine_responses(
self._summarizer, responses, query_bundle
)
else:
final_response = responses[0]
else:
try:
selected_query_engine = self._query_engines[result.ind]
log_str = f"Selecting query engine {result.ind}: {result.reason}."
logger.info(log_str)
if self._verbose:
print_text(log_str + "\n", color="pink")
except ValueError as e:
raise ValueError("Failed to select query engine") from e
final_response = await selected_query_engine.aquery(query_bundle)
# add selected result
final_response.metadata = final_response.metadata or {}
final_response.metadata["selector_result"] = result
query_event.on_end(payload={EventPayload.RESPONSE: final_response})
return final_response
def default_node_to_metadata_fn(node: BaseNode) -> ToolMetadata:
"""Default node to metadata function.
We use the node's text as the Tool description.
"""
metadata = node.metadata or {}
if "tool_name" not in metadata:
raise ValueError("Node must have a tool_name in metadata.")
return ToolMetadata(name=metadata["tool_name"], description=node.get_content())
class RetrieverRouterQueryEngine(BaseQueryEngine):
"""Retriever-based router query engine.
NOTE: this is deprecated, please use our new ToolRetrieverRouterQueryEngine
Use a retriever to select a set of Nodes. Each node will be converted
into a ToolMetadata object, and also used to retrieve a query engine, to form
a QueryEngineTool.
NOTE: this is a beta feature. We are figuring out the right interface
between the retriever and query engine.
Args:
selector (BaseSelector): A selector that chooses one out of many options based
on each candidate's metadata and query.
query_engine_tools (Sequence[QueryEngineTool]): A sequence of candidate
query engines. They must be wrapped as tools to expose metadata to
the selector.
callback_manager (Optional[CallbackManager]): A callback manager.
"""
def __init__(
self,
retriever: BaseRetriever,
node_to_query_engine_fn: Callable,
callback_manager: Optional[CallbackManager] = None,
) -> None:
self._retriever = retriever
self._node_to_query_engine_fn = node_to_query_engine_fn
super().__init__(callback_manager)
def _get_prompt_modules(self) -> PromptMixinType:
"""Get prompt sub-modules."""
# NOTE: don't include tools for now
return {"retriever": self._retriever}
def _query(self, query_bundle: QueryBundle) -> RESPONSE_TYPE:
nodes_with_score = self._retriever.retrieve(query_bundle)
# TODO: for now we only support retrieving one node
if len(nodes_with_score) > 1:
raise ValueError("Retrieved more than one node.")
node = nodes_with_score[0].node
query_engine = self._node_to_query_engine_fn(node)
return query_engine.query(query_bundle)
async def _aquery(self, query_bundle: QueryBundle) -> RESPONSE_TYPE:
return self._query(query_bundle)
class ToolRetrieverRouterQueryEngine(BaseQueryEngine):
"""Tool Retriever router query engine.
Selects a set of candidate query engines to execute a query.
Args:
retriever (ObjectRetriever): A retriever that retrieves a set of
query engine tools.
service_context (Optional[ServiceContext]): A service context.
summarizer (Optional[TreeSummarize]): Tree summarizer to summarize sub-results.
"""
def __init__(
self,
retriever: ObjectRetriever[QueryEngineTool],
llm: Optional[LLM] = None,
service_context: Optional[ServiceContext] = None,
summarizer: Optional[TreeSummarize] = None,
) -> None:
llm = llm or llm_from_settings_or_context(Settings, service_context)
self._summarizer = summarizer or TreeSummarize(
llm=llm,
summary_template=DEFAULT_TREE_SUMMARIZE_PROMPT_SEL,
)
self._retriever = retriever
super().__init__(
callback_manager_from_settings_or_context(Settings, service_context)
)
def _get_prompt_modules(self) -> PromptMixinType:
"""Get prompt sub-modules."""
# NOTE: don't include tools for now
return {"summarizer": self._summarizer}
def _query(self, query_bundle: QueryBundle) -> RESPONSE_TYPE:
with self.callback_manager.event(
CBEventType.QUERY, payload={EventPayload.QUERY_STR: query_bundle.query_str}
) as query_event:
query_engine_tools = self._retriever.retrieve(query_bundle)
responses = []
for query_engine_tool in query_engine_tools:
query_engine = query_engine_tool.query_engine
responses.append(query_engine.query(query_bundle))
if len(responses) > 1:
final_response = combine_responses(
self._summarizer, responses, query_bundle
)
else:
final_response = responses[0]
# add selected result
final_response.metadata = final_response.metadata or {}
final_response.metadata["retrieved_tools"] = query_engine_tools
query_event.on_end(payload={EventPayload.RESPONSE: final_response})
return final_response
async def _aquery(self, query_bundle: QueryBundle) -> RESPONSE_TYPE:
with self.callback_manager.event(
CBEventType.QUERY, payload={EventPayload.QUERY_STR: query_bundle.query_str}
) as query_event:
query_engine_tools = self._retriever.retrieve(query_bundle)
tasks = []
for query_engine_tool in query_engine_tools:
query_engine = query_engine_tool.query_engine
tasks.append(query_engine.aquery(query_bundle))
responses = run_async_tasks(tasks)
if len(responses) > 1:
final_response = await acombine_responses(
self._summarizer, responses, query_bundle
)
else:
final_response = responses[0]
# add selected result
final_response.metadata = final_response.metadata or {}
final_response.metadata["retrieved_tools"] = query_engine_tools
query_event.on_end(payload={EventPayload.RESPONSE: final_response})
return final_response