mirror of
https://github.com/langchain-ai/langgraph.git
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William FHandGitHub
d767af421b
- Initializing the store with an 'embedding config' -> this contains the
'dims' (used to create the table) and the encoder object (rn langchain
embeddings object, though that is ......)
- Call setup() -> creates the vector table.
Each document has 1 or more vectors associated with it for each json
path in the embedding config.
Would welcome critique and requests!
Leaving the params as the defaults for pgvector but open to feedback if
you think it's important to be able to more transparently configure that
in setup()
```python
from typing import TypedDict, List, Dict, Any, Optional
from langchain_openai import OpenAIEmbeddings
from langgraph.graph import StateGraph
from langgraph.store.postgres import PostgresStore
emb_config = {
"dims": 1536, # OpenAI embedding dimensions
"embed": OpenAIEmbeddings(model="text-embedding-3-small"),
"distance_type": "cosine",
}
with PostgresStore.from_conn_string(
"postgres://postgres:postgres@localhost:5441",
embedding=emb_config,
) as store:
store.setup()
# Define the state type for our graph
class State(TypedDict):
query: str
results: Optional[List[Dict[str, Any]]]
def put_stuff(state: State) -> State:
docs = [
("doc1", {"text": "red apple in kitchen"}),
("doc2", {"text": "blue car in garage"}),
("doc3", {"text": "green apple on table"}),
]
for key, value in docs:
store.put(("docs",), key, value)
def search_stuff(state: State) -> State:
"""Search for documents using vector similarity."""
results = store.search(("docs",), query=state["query"])
return {"results": results}
builder = StateGraph(State)
builder.add_node(put_stuff)
builder.add_node(search_stuff)
builder.add_edge("__start__", "put_stuff")
builder.add_edge("put_stuff", "search_stuff")
# Compile
with PostgresStore.from_conn_string(
"postgres://postgres:postgres@localhost:5441",
embedding=emb_config,
) as store:
chain = builder.compile(store=store)
result = chain.invoke({"query": "sour apple"})
# Print results
for doc in result["results"]:
print(doc.key)
print(doc.value)
print(doc.response_metadata)
```
67 lines
2.0 KiB
Makefile
67 lines
2.0 KiB
Makefile
.PHONY: test test_watch lint format
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######################
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# TESTING AND COVERAGE
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######################
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start-postgres:
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POSTGRES_VERSION=${POSTGRES_VERSION:-16} docker compose -f tests/compose-postgres.yml up -V --force-recreate --wait || ( \
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echo "Failed to start PostgreSQL, printing logs..."; \
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docker compose -f tests/compose-postgres.yml logs; \
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exit 1 \
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)
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stop-postgres:
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docker compose -f tests/compose-postgres.yml down
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POSTGRES_VERSIONS ?= 15 16
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test_pg_version:
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@echo "Testing PostgreSQL $(POSTGRES_VERSION)"
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@POSTGRES_VERSION=$(POSTGRES_VERSION) make start-postgres
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@poetry run pytest $(TEST)
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@EXIT_CODE=$$?; \
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make stop-postgres; \
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echo "Finished testing PostgreSQL $(POSTGRES_VERSION); Exit code: $$EXIT_CODE"; \
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exit $$EXIT_CODE
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test:
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@for version in $(POSTGRES_VERSIONS); do \
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if ! make test_pg_version POSTGRES_VERSION=$$version; then \
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echo "Test failed for PostgreSQL $$version"; \
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exit 1; \
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fi; \
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done
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@echo "All PostgreSQL versions tested successfully"
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TEST ?= .
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test_watch:
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POSTGRES_VERSION=${POSTGRES_VERSION:-16} make start-postgres; \
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poetry run ptw $(TEST); \
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EXIT_CODE=$$?; \
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make stop-postgres; \
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exit $$EXIT_CODE
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######################
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# LINTING AND FORMATTING
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######################
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# Define a variable for Python and notebook files.
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PYTHON_FILES=.
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MYPY_CACHE=.mypy_cache
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lint format: PYTHON_FILES=.
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lint_diff format_diff: PYTHON_FILES=$(shell git diff --name-only --relative --diff-filter=d main . | grep -E '\.py$$|\.ipynb$$')
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lint_package: PYTHON_FILES=langgraph
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lint_tests: PYTHON_FILES=tests
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lint_tests: MYPY_CACHE=.mypy_cache_test
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lint lint_diff lint_package lint_tests:
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poetry run ruff check .
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[ "$(PYTHON_FILES)" = "" ] || poetry run ruff format $(PYTHON_FILES) --diff
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[ "$(PYTHON_FILES)" = "" ] || poetry run ruff check --select I $(PYTHON_FILES)
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[ "$(PYTHON_FILES)" = "" ] || mkdir -p $(MYPY_CACHE)
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[ "$(PYTHON_FILES)" = "" ] || poetry run mypy $(PYTHON_FILES) --cache-dir $(MYPY_CACHE)
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format format_diff:
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poetry run ruff format $(PYTHON_FILES)
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poetry run ruff check --select I --fix $(PYTHON_FILES)
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