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import asyncio
import copy
import json
import logging
import uuid
from typing import Any, AsyncGenerator, Optional
from r2r.base import (
AsyncState,
Extraction,
Fragment,
FragmentType,
KGExtraction,
KGProvider,
KVLoggingSingleton,
LLMProvider,
PipeType,
PromptProvider,
TextSplitter,
extract_entities,
extract_triples,
generate_id_from_label,
)
from r2r.base.pipes.base_pipe import AsyncPipe
logger = logging.getLogger(__name__)
class ClientError(Exception):
"""Base class for client connection errors."""
pass
class KGExtractionPipe(AsyncPipe):
"""
Embeds and stores documents using a specified embedding model and database.
"""
def __init__(
self,
kg_provider: KGProvider,
llm_provider: LLMProvider,
prompt_provider: PromptProvider,
text_splitter: TextSplitter,
kg_batch_size: int = 1,
id_prefix: str = "demo",
pipe_logger: Optional[KVLoggingSingleton] = None,
type: PipeType = PipeType.INGESTOR,
config: Optional[AsyncPipe.PipeConfig] = None,
*args,
**kwargs,
):
"""
Initializes the embedding pipe with necessary components and configurations.
"""
super().__init__(
pipe_logger=pipe_logger,
type=type,
config=config
or AsyncPipe.PipeConfig(name="default_embedding_pipe"),
)
self.kg_provider = kg_provider
self.prompt_provider = prompt_provider
self.llm_provider = llm_provider
self.text_splitter = text_splitter
self.kg_batch_size = kg_batch_size
self.id_prefix = id_prefix
self.pipe_run_info = None
async def fragment(
self, extraction: Extraction, run_id: uuid.UUID
) -> AsyncGenerator[Fragment, None]:
"""
Splits text into manageable chunks for embedding.
"""
if not isinstance(extraction, Extraction):
raise ValueError(
f"Expected an Extraction, but received {type(extraction)}."
)
if not isinstance(extraction.data, str):
raise ValueError(
f"Expected a string, but received {type(extraction.data)}."
)
text_chunks = [
ele.page_content
for ele in self.text_splitter.create_documents([extraction.data])
]
for iteration, chunk in enumerate(text_chunks):
fragment = Fragment(
id=generate_id_from_label(f"{extraction.id}-{iteration}"),
type=FragmentType.TEXT,
data=chunk,
metadata=copy.deepcopy(extraction.metadata),
extraction_id=extraction.id,
document_id=extraction.document_id,
)
yield fragment
async def transform_fragments(
self, fragments: list[Fragment]
) -> AsyncGenerator[Fragment, None]:
"""
Transforms text chunks based on their metadata, e.g., adding prefixes.
"""
async for fragment in fragments:
if "chunk_prefix" in fragment.metadata:
prefix = fragment.metadata.pop("chunk_prefix")
fragment.data = f"{prefix}\n{fragment.data}"
yield fragment
async def extract_kg(
self,
fragment: Fragment,
retries: int = 3,
delay: int = 2,
) -> KGExtraction:
"""
Extracts NER triples from a list of fragments with retries.
"""
task_prompt = self.prompt_provider.get_prompt(
self.kg_provider.config.kg_extraction_prompt,
inputs={"input": fragment.data},
)
messages = self.prompt_provider._get_message_payload(
self.prompt_provider.get_prompt("default_system"), task_prompt
)
for attempt in range(retries):
try:
response = await self.llm_provider.aget_completion(
messages, self.kg_provider.config.kg_extraction_config
)
kg_extraction = response.choices[0].message.content
# Parsing JSON from the response
kg_json = (
json.loads(
kg_extraction.split("```json")[1].split("```")[0]
)
if """```json""" in kg_extraction
else json.loads(kg_extraction)
)
llm_payload = kg_json.get("entities_and_triples", {})
# Extract triples with detailed logging
entities = extract_entities(llm_payload)
triples = extract_triples(llm_payload, entities)
# Create KG extraction object
return KGExtraction(entities=entities, triples=triples)
except (
ClientError,
json.JSONDecodeError,
KeyError,
IndexError,
) as e:
logger.error(f"Error in extract_kg: {e}")
if attempt < retries - 1:
await asyncio.sleep(delay)
else:
logger.error(f"Failed after retries with {e}")
# raise e # Ensure the exception is raised after the final attempt
return KGExtraction(entities={}, triples=[])
async def _process_batch(
self,
fragment_batch: list[Fragment],
) -> list[KGExtraction]:
"""
Embeds a batch of fragments and yields vector entries.
"""
tasks = [
asyncio.create_task(self.extract_kg(fragment))
for fragment in fragment_batch
]
return await asyncio.gather(*tasks)
async def _run_logic(
self,
input: AsyncPipe.Input,
state: AsyncState,
run_id: uuid.UUID,
*args: Any,
**kwargs: Any,
) -> AsyncGenerator[KGExtraction, None]:
"""
Executes the embedding pipe: chunking, transforming, embedding, and storing documents.
"""
batch_tasks = []
fragment_batch = []
fragment_info = {}
async for extraction in input.message:
async for fragment in self.transform_fragments(
self.fragment(extraction, run_id)
):
if extraction.document_id in fragment_info:
fragment_info[extraction.document_id] += 1
else:
fragment_info[extraction.document_id] = 1
extraction.metadata["chunk_order"] = fragment_info[
extraction.document_id
]
fragment_batch.append(fragment)
if len(fragment_batch) >= self.kg_batch_size:
# Here, ensure `_process_batch` is scheduled as a coroutine, not called directly
batch_tasks.append(
self._process_batch(fragment_batch.copy())
) # pass a copy if necessary
fragment_batch.clear() # Clear the batch for new fragments
logger.debug(
f"Fragmented the input document ids into counts as shown: {fragment_info}"
)
if fragment_batch: # Process any remaining fragments
batch_tasks.append(self._process_batch(fragment_batch.copy()))
# Process tasks as they complete
for task in asyncio.as_completed(batch_tasks):
batch_result = await task # Wait for the next task to complete
for kg_extraction in batch_result:
yield kg_extraction
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