langchain[patch]: Update more code to use langchain community as an optional dependency (#21170)

More code to use langchain community as an optional dependency

libs/langchain/langchain/agents/react/base.py

@@ -1,7 +1,8 @@
 """Chain that implements the ReAct paper from https://arxiv.org/pdf/2210.03629.pdf."""
-from typing import Any, List, Optional, Sequence
+from __future__ import annotations
+
+from typing import TYPE_CHECKING, Any, List, Optional, Sequence
 
-from langchain_community.docstore.base import Docstore
 from langchain_core._api import deprecated
 from langchain_core.documents import Document
 from langchain_core.language_models import BaseLanguageModel
@@ -16,6 +17,9 @@ from langchain.agents.react.textworld_prompt import TEXTWORLD_PROMPT
 from langchain.agents.react.wiki_prompt import WIKI_PROMPT
 from langchain.agents.utils import validate_tools_single_input
 
+if TYPE_CHECKING:
+    from langchain_community.docstore.base import Docstore
+
 
 @deprecated("0.1.0", removal="0.2.0")
 class ReActDocstoreAgent(Agent):

libs/langchain/langchain/agents/self_ask_with_search/base.py

@@ -1,9 +1,8 @@
 """Chain that does self-ask with search."""
-from typing import Any, Sequence, Union
+from __future__ import annotations
+
+from typing import TYPE_CHECKING, Any, Sequence, Union
 
-from langchain_community.utilities.google_serper import GoogleSerperAPIWrapper
-from langchain_community.utilities.searchapi import SearchApiAPIWrapper
-from langchain_community.utilities.serpapi import SerpAPIWrapper
 from langchain_core._api import deprecated
 from langchain_core.language_models import BaseLanguageModel
 from langchain_core.prompts import BasePromptTemplate
@@ -18,6 +17,11 @@ from langchain.agents.self_ask_with_search.output_parser import SelfAskOutputPar
 from langchain.agents.self_ask_with_search.prompt import PROMPT
 from langchain.agents.utils import validate_tools_single_input
 
+if TYPE_CHECKING:
+    from langchain_community.utilities.google_serper import GoogleSerperAPIWrapper
+    from langchain_community.utilities.searchapi import SearchApiAPIWrapper
+    from langchain_community.utilities.serpapi import SerpAPIWrapper
+
 
 @deprecated("0.1.0", alternative="create_self_ask_with_search", removal="0.2.0")
 class SelfAskWithSearchAgent(Agent):

libs/langchain/langchain/chains/api/base.py

@@ -4,7 +4,6 @@ from __future__ import annotations
 from typing import Any, Dict, List, Optional, Sequence, Tuple
 from urllib.parse import urlparse
 
-from langchain_community.utilities.requests import TextRequestsWrapper
 from langchain_core.callbacks import (
     AsyncCallbackManagerForChainRun,
     CallbackManagerForChainRun,
@@ -50,189 +49,205 @@ def _check_in_allowed_domain(url: str, limit_to_domains: Sequence[str]) -> bool:
     return False
 
 
-class APIChain(Chain):
+try:
-    """Chain that makes API calls and summarizes the responses to answer a question.
+    from langchain_community.utilities.requests import TextRequestsWrapper
 
-    *Security Note*: This API chain uses the requests toolkit
+    class APIChain(Chain):
-        to make GET, POST, PATCH, PUT, and DELETE requests to an API.
+        """Chain that makes API calls and summarizes the responses to answer a question.
 
-        Exercise care in who is allowed to use this chain. If exposing
+        *Security Note*: This API chain uses the requests toolkit
-        to end users, consider that users will be able to make arbitrary
+            to make GET, POST, PATCH, PUT, and DELETE requests to an API.
-        requests on behalf of the server hosting the code. For example,
-        users could ask the server to make a request to a private API
-        that is only accessible from the server.
 
-        Control access to who can submit issue requests using this toolkit and
+            Exercise care in who is allowed to use this chain. If exposing
-        what network access it has.
+            to end users, consider that users will be able to make arbitrary
+            requests on behalf of the server hosting the code. For example,
+            users could ask the server to make a request to a private API
+            that is only accessible from the server.
 
-        See https://python.langchain.com/docs/security for more information.
+            Control access to who can submit issue requests using this toolkit and
-    """
+            what network access it has.
 
-    api_request_chain: LLMChain
+            See https://python.langchain.com/docs/security for more information.
-    api_answer_chain: LLMChain
+        """
-    requests_wrapper: TextRequestsWrapper = Field(exclude=True)
+
-    api_docs: str
+        api_request_chain: LLMChain
-    question_key: str = "question"  #: :meta private:
+        api_answer_chain: LLMChain
-    output_key: str = "output"  #: :meta private:
+        requests_wrapper: TextRequestsWrapper = Field(exclude=True)
-    limit_to_domains: Optional[Sequence[str]]
+        api_docs: str
-    """Use to limit the domains that can be accessed by the API chain.
+        question_key: str = "question"  #: :meta private:
-    
+        output_key: str = "output"  #: :meta private:
-    * For example, to limit to just the domain `https://www.example.com`, set
+        limit_to_domains: Optional[Sequence[str]]
-        `limit_to_domains=["https://www.example.com"]`.
+        """Use to limit the domains that can be accessed by the API chain.
         
-    * The default value is an empty tuple, which means that no domains are
+        * For example, to limit to just the domain `https://www.example.com`, set
-      allowed by default. By design this will raise an error on instantiation.
+            `limit_to_domains=["https://www.example.com"]`.
-    * Use a None if you want to allow all domains by default -- this is not
+            
-      recommended for security reasons, as it would allow malicious users to
+        * The default value is an empty tuple, which means that no domains are
-      make requests to arbitrary URLS including internal APIs accessible from
+          allowed by default. By design this will raise an error on instantiation.
-      the server.
+        * Use a None if you want to allow all domains by default -- this is not
-    """
+          recommended for security reasons, as it would allow malicious users to
-
+          make requests to arbitrary URLS including internal APIs accessible from
-    @property
+          the server.
-    def input_keys(self) -> List[str]:
-        """Expect input key.
-
-        :meta private:
         """
-        return [self.question_key]
 
-    @property
+        @property
-    def output_keys(self) -> List[str]:
+        def input_keys(self) -> List[str]:
-        """Expect output key.
+            """Expect input key.
 
-        :meta private:
+            :meta private:
-        """
+            """
-        return [self.output_key]
+            return [self.question_key]
 
-    @root_validator(pre=True)
+        @property
-    def validate_api_request_prompt(cls, values: Dict) -> Dict:
+        def output_keys(self) -> List[str]:
-        """Check that api request prompt expects the right variables."""
+            """Expect output key.
-        input_vars = values["api_request_chain"].prompt.input_variables
+
-        expected_vars = {"question", "api_docs"}
+            :meta private:
-        if set(input_vars) != expected_vars:
+            """
-            raise ValueError(
+            return [self.output_key]
-                f"Input variables should be {expected_vars}, got {input_vars}"
+
+        @root_validator(pre=True)
+        def validate_api_request_prompt(cls, values: Dict) -> Dict:
+            """Check that api request prompt expects the right variables."""
+            input_vars = values["api_request_chain"].prompt.input_variables
+            expected_vars = {"question", "api_docs"}
+            if set(input_vars) != expected_vars:
+                raise ValueError(
+                    f"Input variables should be {expected_vars}, got {input_vars}"
+                )
+            return values
+
+        @root_validator(pre=True)
+        def validate_limit_to_domains(cls, values: Dict) -> Dict:
+            """Check that allowed domains are valid."""
+            if "limit_to_domains" not in values:
+                raise ValueError(
+                    "You must specify a list of domains to limit access using "
+                    "`limit_to_domains`"
+                )
+            if (
+                not values["limit_to_domains"]
+                and values["limit_to_domains"] is not None
+            ):
+                raise ValueError(
+                    "Please provide a list of domains to limit access using "
+                    "`limit_to_domains`."
+                )
+            return values
+
+        @root_validator(pre=True)
+        def validate_api_answer_prompt(cls, values: Dict) -> Dict:
+            """Check that api answer prompt expects the right variables."""
+            input_vars = values["api_answer_chain"].prompt.input_variables
+            expected_vars = {"question", "api_docs", "api_url", "api_response"}
+            if set(input_vars) != expected_vars:
+                raise ValueError(
+                    f"Input variables should be {expected_vars}, got {input_vars}"
+                )
+            return values
+
+        def _call(
+            self,
+            inputs: Dict[str, Any],
+            run_manager: Optional[CallbackManagerForChainRun] = None,
+        ) -> Dict[str, str]:
+            _run_manager = run_manager or CallbackManagerForChainRun.get_noop_manager()
+            question = inputs[self.question_key]
+            api_url = self.api_request_chain.predict(
+                question=question,
+                api_docs=self.api_docs,
+                callbacks=_run_manager.get_child(),
             )
-        return values
+            _run_manager.on_text(api_url, color="green", end="\n", verbose=self.verbose)
-
+            api_url = api_url.strip()
-    @root_validator(pre=True)
+            if self.limit_to_domains and not _check_in_allowed_domain(
-    def validate_limit_to_domains(cls, values: Dict) -> Dict:
+                api_url, self.limit_to_domains
-        """Check that allowed domains are valid."""
+            ):
-        if "limit_to_domains" not in values:
+                raise ValueError(
-            raise ValueError(
+                    f"{api_url} is not in the allowed domains: {self.limit_to_domains}"
-                "You must specify a list of domains to limit access using "
+                )
-                "`limit_to_domains`"
+            api_response = self.requests_wrapper.get(api_url)
+            _run_manager.on_text(
+                str(api_response), color="yellow", end="\n", verbose=self.verbose
             )
-        if not values["limit_to_domains"] and values["limit_to_domains"] is not None:
+            answer = self.api_answer_chain.predict(
-            raise ValueError(
+                question=question,
-                "Please provide a list of domains to limit access using "
+                api_docs=self.api_docs,
-                "`limit_to_domains`."
+                api_url=api_url,
+                api_response=api_response,
+                callbacks=_run_manager.get_child(),
             )
-        return values
+            return {self.output_key: answer}
 
-    @root_validator(pre=True)
+        async def _acall(
-    def validate_api_answer_prompt(cls, values: Dict) -> Dict:
+            self,
-        """Check that api answer prompt expects the right variables."""
+            inputs: Dict[str, Any],
-        input_vars = values["api_answer_chain"].prompt.input_variables
+            run_manager: Optional[AsyncCallbackManagerForChainRun] = None,
-        expected_vars = {"question", "api_docs", "api_url", "api_response"}
+        ) -> Dict[str, str]:
-        if set(input_vars) != expected_vars:
+            _run_manager = (
-            raise ValueError(
+                run_manager or AsyncCallbackManagerForChainRun.get_noop_manager()
-                f"Input variables should be {expected_vars}, got {input_vars}"
             )
-        return values
+            question = inputs[self.question_key]
-
+            api_url = await self.api_request_chain.apredict(
-    def _call(
+                question=question,
-        self,
+                api_docs=self.api_docs,
-        inputs: Dict[str, Any],
+                callbacks=_run_manager.get_child(),
-        run_manager: Optional[CallbackManagerForChainRun] = None,
-    ) -> Dict[str, str]:
-        _run_manager = run_manager or CallbackManagerForChainRun.get_noop_manager()
-        question = inputs[self.question_key]
-        api_url = self.api_request_chain.predict(
-            question=question,
-            api_docs=self.api_docs,
-            callbacks=_run_manager.get_child(),
-        )
-        _run_manager.on_text(api_url, color="green", end="\n", verbose=self.verbose)
-        api_url = api_url.strip()
-        if self.limit_to_domains and not _check_in_allowed_domain(
-            api_url, self.limit_to_domains
-        ):
-            raise ValueError(
-                f"{api_url} is not in the allowed domains: {self.limit_to_domains}"
             )
-        api_response = self.requests_wrapper.get(api_url)
+            await _run_manager.on_text(
-        _run_manager.on_text(
+                api_url, color="green", end="\n", verbose=self.verbose
-            str(api_response), color="yellow", end="\n", verbose=self.verbose
-        )
-        answer = self.api_answer_chain.predict(
-            question=question,
-            api_docs=self.api_docs,
-            api_url=api_url,
-            api_response=api_response,
-            callbacks=_run_manager.get_child(),
-        )
-        return {self.output_key: answer}
-
-    async def _acall(
-        self,
-        inputs: Dict[str, Any],
-        run_manager: Optional[AsyncCallbackManagerForChainRun] = None,
-    ) -> Dict[str, str]:
-        _run_manager = run_manager or AsyncCallbackManagerForChainRun.get_noop_manager()
-        question = inputs[self.question_key]
-        api_url = await self.api_request_chain.apredict(
-            question=question,
-            api_docs=self.api_docs,
-            callbacks=_run_manager.get_child(),
-        )
-        await _run_manager.on_text(
-            api_url, color="green", end="\n", verbose=self.verbose
-        )
-        api_url = api_url.strip()
-        if self.limit_to_domains and not _check_in_allowed_domain(
-            api_url, self.limit_to_domains
-        ):
-            raise ValueError(
-                f"{api_url} is not in the allowed domains: {self.limit_to_domains}"
             )
-        api_response = await self.requests_wrapper.aget(api_url)
+            api_url = api_url.strip()
-        await _run_manager.on_text(
+            if self.limit_to_domains and not _check_in_allowed_domain(
-            str(api_response), color="yellow", end="\n", verbose=self.verbose
+                api_url, self.limit_to_domains
-        )
+            ):
-        answer = await self.api_answer_chain.apredict(
+                raise ValueError(
-            question=question,
+                    f"{api_url} is not in the allowed domains: {self.limit_to_domains}"
-            api_docs=self.api_docs,
+                )
-            api_url=api_url,
+            api_response = await self.requests_wrapper.aget(api_url)
-            api_response=api_response,
+            await _run_manager.on_text(
-            callbacks=_run_manager.get_child(),
+                str(api_response), color="yellow", end="\n", verbose=self.verbose
-        )
+            )
-        return {self.output_key: answer}
+            answer = await self.api_answer_chain.apredict(
+                question=question,
+                api_docs=self.api_docs,
+                api_url=api_url,
+                api_response=api_response,
+                callbacks=_run_manager.get_child(),
+            )
+            return {self.output_key: answer}
 
-    @classmethod
+        @classmethod
-    def from_llm_and_api_docs(
+        def from_llm_and_api_docs(
-        cls,
+            cls,
-        llm: BaseLanguageModel,
+            llm: BaseLanguageModel,
-        api_docs: str,
+            api_docs: str,
-        headers: Optional[dict] = None,
+            headers: Optional[dict] = None,
-        api_url_prompt: BasePromptTemplate = API_URL_PROMPT,
+            api_url_prompt: BasePromptTemplate = API_URL_PROMPT,
-        api_response_prompt: BasePromptTemplate = API_RESPONSE_PROMPT,
+            api_response_prompt: BasePromptTemplate = API_RESPONSE_PROMPT,
-        limit_to_domains: Optional[Sequence[str]] = tuple(),
+            limit_to_domains: Optional[Sequence[str]] = tuple(),
-        **kwargs: Any,
+            **kwargs: Any,
-    ) -> APIChain:
+        ) -> APIChain:
-        """Load chain from just an LLM and the api docs."""
+            """Load chain from just an LLM and the api docs."""
-        get_request_chain = LLMChain(llm=llm, prompt=api_url_prompt)
+            get_request_chain = LLMChain(llm=llm, prompt=api_url_prompt)
-        requests_wrapper = TextRequestsWrapper(headers=headers)
+            requests_wrapper = TextRequestsWrapper(headers=headers)
-        get_answer_chain = LLMChain(llm=llm, prompt=api_response_prompt)
+            get_answer_chain = LLMChain(llm=llm, prompt=api_response_prompt)
-        return cls(
+            return cls(
-            api_request_chain=get_request_chain,
+                api_request_chain=get_request_chain,
-            api_answer_chain=get_answer_chain,
+                api_answer_chain=get_answer_chain,
-            requests_wrapper=requests_wrapper,
+                requests_wrapper=requests_wrapper,
-            api_docs=api_docs,
+                api_docs=api_docs,
-            limit_to_domains=limit_to_domains,
+                limit_to_domains=limit_to_domains,
-            **kwargs,
+                **kwargs,
-        )
+            )
 
-    @property
+        @property
-    def _chain_type(self) -> str:
+        def _chain_type(self) -> str:
-        return "api_chain"
+            return "api_chain"
+except ImportError:
+
+    class APIChain:  # type: ignore[no-redef]
+        def __init__(self, *args: Any, **kwargs: Any) -> None:
+            raise ImportError(
+                "To use the APIChain, you must install the langchain_community package."
+                "pip install langchain_community"
+            )

libs/langchain/langchain/chains/loading.py

@@ -5,7 +5,6 @@ from pathlib import Path
 from typing import Any, Union
 
 import yaml
-from langchain_community.llms.loading import load_llm, load_llm_from_config
 from langchain_core.prompts.loading import (
     _load_output_parser,
     load_prompt,
@@ -30,6 +29,27 @@ from langchain.chains.qa_with_sources.retrieval import RetrievalQAWithSourcesCha
 from langchain.chains.qa_with_sources.vector_db import VectorDBQAWithSourcesChain
 from langchain.chains.retrieval_qa.base import RetrievalQA, VectorDBQA
 
+try:
+    from langchain_community.llms.loading import load_llm, load_llm_from_config
+except ImportError:
+
+    def load_llm(*args: Any, **kwargs: Any) -> None:  # type: ignore
+        raise ImportError(
+            "To use this load_llm functionality you must install the "
+            "langchain_community package. "
+            "You can install it with `pip install langchain_community`"
+        )
+
+    def load_llm_from_config(  # type: ignore
+        *args: Any, **kwargs: Any
+    ) -> None:
+        raise ImportError(
+            "To use this load_llm_from_config functionality you must install the "
+            "langchain_community package. "
+            "You can install it with `pip install langchain_community`"
+        )
+
+
 URL_BASE = "https://raw.githubusercontent.com/hwchase17/langchain-hub/master/chains/"
 
 

libs/langchain/langchain/chains/openai_functions/openapi.py

@@ -6,7 +6,6 @@ from collections import defaultdict
 from typing import TYPE_CHECKING, Any, Callable, Dict, List, Optional, Tuple, Union
 
 import requests
-from langchain_community.utilities.openapi import OpenAPISpec
 from langchain_core.callbacks import CallbackManagerForChainRun
 from langchain_core.language_models import BaseLanguageModel
 from langchain_core.output_parsers.openai_functions import JsonOutputFunctionsParser
@@ -20,6 +19,7 @@ from langchain.chains.sequential import SequentialChain
 from langchain.tools import APIOperation
 
 if TYPE_CHECKING:
+    from langchain_community.utilities.openapi import OpenAPISpec
     from openapi_pydantic import Parameter
 
 
@@ -255,6 +255,13 @@ def get_openapi_chain(
         prompt: Main prompt template to use.
         request_chain: Chain for taking the functions output and executing the request.
     """
+    try:
+        from langchain_community.utilities.openapi import OpenAPISpec
+    except ImportError as e:
+        raise ImportError(
+            "Could not import langchain_community.utilities.openapi. "
+            "Please install it with `pip install langchain-community`."
+        ) from e
     if isinstance(spec, str):
         for conversion in (
             OpenAPISpec.from_url,

libs/langchain/langchain/chains/sql_database/query.py

@@ -1,6 +1,7 @@
-from typing import Any, Dict, List, Optional, TypedDict, Union
+from __future__ import annotations
+
+from typing import TYPE_CHECKING, Any, Dict, List, Optional, TypedDict, Union
 
-from langchain_community.utilities.sql_database import SQLDatabase
 from langchain_core.language_models import BaseLanguageModel
 from langchain_core.output_parsers import StrOutputParser
 from langchain_core.prompts import BasePromptTemplate
@@ -8,6 +9,9 @@ from langchain_core.runnables import Runnable, RunnablePassthrough
 
 from langchain.chains.sql_database.prompt import PROMPT, SQL_PROMPTS
 
+if TYPE_CHECKING:
+    from langchain_community.utilities.sql_database import SQLDatabase
+
 
 def _strip(text: str) -> str:
     return text.strip()

libs/langchain/langchain/document_loaders/parsers/language/python.py

@@ -1,3 +1,27 @@
-from langchain_community.document_loaders.parsers.language.python import PythonSegmenter
+from typing import TYPE_CHECKING, Any
 
-__all__ = ["PythonSegmenter"]
+from langchain._api import create_importer
+
+if TYPE_CHECKING:
+    from langchain_community.document_loaders.parsers.language.python import (
+        PythonSegmenter,
+    )
+
+# Create a way to dynamically look up deprecated imports.
+# Used to consolidate logic for raising deprecation warnings and
+# handling optional imports.
+DEPRECATED_LOOKUP = {
+    "PythonSegmenter": "langchain_community.document_loaders.parsers.language.python"
+}
+
+_import_attribute = create_importer(__package__, deprecated_lookups=DEPRECATED_LOOKUP)
+
+
+def __getattr__(name: str) -> Any:
+    """Look up attributes dynamically."""
+    return _import_attribute(name)
+
+
+__all__ = [
+    "PythonSegmenter",
+]

libs/langchain/langchain/document_loaders/pyspark_dataframe.py

@@ -1,5 +1,26 @@
-from langchain_community.document_loaders.pyspark_dataframe import (
+from typing import TYPE_CHECKING, Any
-    PySparkDataFrameLoader,
+
-)
+from langchain._api import create_importer
+
+if TYPE_CHECKING:
+    from langchain_community.document_loaders.pyspark_dataframe import (
+        PySparkDataFrameLoader,
+    )
+
+
+# Create a way to dynamically look up deprecated imports.
+# Used to consolidate logic for raising deprecation warnings and
+# handling optional imports.
+DEPRECATED_LOOKUP = {
+    "PySparkDataFrameLoader": "langchain_community.document_loaders.pyspark_dataframe"
+}
+
+_import_attribute = create_importer(__package__, deprecated_lookups=DEPRECATED_LOOKUP)
+
+
+def __getattr__(name: str) -> Any:
+    """Look up attributes dynamically."""
+    return _import_attribute(name)
+
 
 __all__ = ["PySparkDataFrameLoader"]

libs/langchain/langchain/document_loaders/python.py

@@ -1,3 +1,22 @@
-from langchain_community.document_loaders.python import PythonLoader
+from typing import TYPE_CHECKING, Any
+
+from langchain._api import create_importer
+
+if TYPE_CHECKING:
+    from langchain_community.document_loaders.python import PythonLoader
+
+
+# Create a way to dynamically look up deprecated imports.
+# Used to consolidate logic for raising deprecation warnings and
+# handling optional imports.
+DEPRECATED_LOOKUP = {"PythonLoader": "langchain_community.document_loaders.python"}
+
+_import_attribute = create_importer(__package__, deprecated_lookups=DEPRECATED_LOOKUP)
+
+
+def __getattr__(name: str) -> Any:
+    """Look up attributes dynamically."""
+    return _import_attribute(name)
+
 
 __all__ = ["PythonLoader"]

libs/langchain/langchain/embeddings/sentence_transformer.py

@@ -1,5 +1,21 @@
-from langchain_community.embeddings.sentence_transformer import (
+from typing import TYPE_CHECKING, Any
-    SentenceTransformerEmbeddings,
+
-)
+from langchain._api import create_importer
+
+if TYPE_CHECKING:
+    from langchain_community.embeddings import SentenceTransformerEmbeddings
+
+# Create a way to dynamically look up deprecated imports.
+# Used to consolidate logic for raising deprecation warnings and
+# handling optional imports.
+DEPRECATED_LOOKUP = {"SentenceTransformerEmbeddings": "langchain_community.embeddings"}
+
+_import_attribute = create_importer(__package__, deprecated_lookups=DEPRECATED_LOOKUP)
+
+
+def __getattr__(name: str) -> Any:
+    """Look up attributes dynamically."""
+    return _import_attribute(name)
+
 
 __all__ = ["SentenceTransformerEmbeddings"]

libs/langchain/langchain/evaluation/scoring/eval_chain.py

@@ -5,8 +5,6 @@ import logging
 import re
 from typing import Any, Dict, List, Optional, Union
 
-from langchain_community.chat_models.azure_openai import AzureChatOpenAI
-from langchain_community.chat_models.openai import ChatOpenAI
 from langchain_core.callbacks.manager import Callbacks
 from langchain_core.language_models import BaseLanguageModel
 from langchain_core.output_parsers import BaseOutputParser
@@ -258,10 +256,7 @@ class ScoreStringEvalChain(StringEvaluator, LLMEvalChain, LLMChain):
             ValueError: If the input variables are not as expected.
 
         """
-        if not (
+        if not (hasattr(llm, "model_name") and not llm.model_name.startswith("gpt-4")):
-            isinstance(llm, (ChatOpenAI, AzureChatOpenAI))
-            and llm.model_name.startswith("gpt-4")
-        ):
             logger.warning(
                 "This chain was only tested with GPT-4. \
 Performance may be significantly worse with other models."

libs/langchain/langchain/indexes/__init__.py

@@ -11,12 +11,33 @@ Importantly, Index keeps on working even if the content being written is derived
 via a set of transformations from some source content (e.g., indexing children
 documents that were derived from parent documents by chunking.)
 """
-from langchain_community.graphs.index_creator import GraphIndexCreator
+from typing import TYPE_CHECKING, Any
+
 from langchain_core.indexing.api import IndexingResult, aindex, index
 
+from langchain._api import create_importer
 from langchain.indexes._sql_record_manager import SQLRecordManager
 from langchain.indexes.vectorstore import VectorstoreIndexCreator
 
+if TYPE_CHECKING:
+    from langchain_community.graphs.index_creator import GraphIndexCreator
+
+
+# Create a way to dynamically look up deprecated imports.
+# Used to consolidate logic for raising deprecation warnings and
+# handling optional imports.
+DEPRECATED_LOOKUP = {
+    "GraphIndexCreator": "langchain_community.graphs.index_creator",
+}
+
+_import_attribute = create_importer(__package__, deprecated_lookups=DEPRECATED_LOOKUP)
+
+
+def __getattr__(name: str) -> Any:
+    """Look up attributes dynamically."""
+    return _import_attribute(name)
+
+
 __all__ = [
     # Keep sorted
     "aindex",

libs/langchain/langchain/indexes/graph.py

@@ -1,5 +1,27 @@
-"""Graph Index Creator."""
+"""**Graphs** provide a natural language interface to graph databases."""
-from langchain_community.graphs.index_creator import GraphIndexCreator
+from typing import TYPE_CHECKING, Any
-from langchain_community.graphs.networkx_graph import NetworkxEntityGraph
+
+from langchain._api import create_importer
+
+if TYPE_CHECKING:
+    from langchain_community.graphs.index_creator import GraphIndexCreator
+    from langchain_community.graphs.networkx_graph import NetworkxEntityGraph
+
+
+# Create a way to dynamically look up deprecated imports.
+# Used to consolidate logic for raising deprecation warnings and
+# handling optional imports.
+DEPRECATED_LOOKUP = {
+    "GraphIndexCreator": "langchain_community.graphs.index_creator",
+    "NetworkxEntityGraph": "langchain_community.graphs.networkx_graph",
+}
+
+_import_attribute = create_importer(__package__, deprecated_lookups=DEPRECATED_LOOKUP)
+
+
+def __getattr__(name: str) -> Any:
+    """Look up attributes dynamically."""
+    return _import_attribute(name)
+
 
 __all__ = ["GraphIndexCreator", "NetworkxEntityGraph"]

libs/langchain/langchain/indexes/prompts/knowledge_triplet_extraction.py

@@ -1,8 +1,9 @@
 # flake8: noqa
 
-from langchain_community.graphs.networkx_graph import KG_TRIPLE_DELIMITER
 from langchain_core.prompts.prompt import PromptTemplate
 
+KG_TRIPLE_DELIMITER = "<|>"
+
 _DEFAULT_KNOWLEDGE_TRIPLE_EXTRACTION_TEMPLATE = (
     "You are a networked intelligence helping a human track knowledge triples"
     " about all relevant people, things, concepts, etc. and integrating"

libs/langchain/langchain/indexes/vectorstore.py

@@ -1,6 +1,5 @@
 from typing import Any, Dict, List, Optional, Type
 
-from langchain_community.vectorstores.inmemory import InMemoryVectorStore
 from langchain_core.document_loaders import BaseLoader
 from langchain_core.documents import Document
 from langchain_core.embeddings import Embeddings
@@ -117,10 +116,30 @@ class VectorStoreIndexWrapper(BaseModel):
         return await chain.ainvoke({chain.question_key: question})
 
 
+def _get_in_memory_vectorstore() -> Type[VectorStore]:
+    """Get the InMemoryVectorStore."""
+    import warnings
+
+    try:
+        from langchain_community.vectorstores.inmemory import InMemoryVectorStore
+    except ImportError:
+        raise ImportError(
+            "Please install langchain-community to use the InMemoryVectorStore."
+        )
+    warnings.warn(
+        "Using InMemoryVectorStore as the default vectorstore."
+        "This memory store won't persist data. You should explicitly"
+        "specify a vectorstore when using VectorstoreIndexCreator"
+    )
+    return InMemoryVectorStore
+
+
 class VectorstoreIndexCreator(BaseModel):
     """Logic for creating indexes."""
 
-    vectorstore_cls: Type[VectorStore] = InMemoryVectorStore
+    vectorstore_cls: Type[VectorStore] = Field(
+        default_factory=_get_in_memory_vectorstore
+    )
     embedding: Embeddings
     text_splitter: TextSplitter = Field(default_factory=_get_default_text_splitter)
     vectorstore_kwargs: dict = Field(default_factory=dict)

libs/langchain/langchain/llms/titan_takeoff_pro.py

@@ -1,3 +1,23 @@
-from langchain_community.llms.titan_takeoff import TitanTakeoff as TitanTakeoffPro
+from typing import TYPE_CHECKING, Any
 
-__all__ = ["TitanTakeoffPro"]
+from langchain._api import create_importer
+
+if TYPE_CHECKING:
+    from langchain_community.llms import TitanTakeoffPro
+
+# Create a way to dynamically look up deprecated imports.
+# Used to consolidate logic for raising deprecation warnings and
+# handling optional imports.
+DEPRECATED_LOOKUP = {"TitanTakeoffPro": "langchain_community.llms"}
+
+_import_attribute = create_importer(__package__, deprecated_lookups=DEPRECATED_LOOKUP)
+
+
+def __getattr__(name: str) -> Any:
+    """Look up attributes dynamically."""
+    return _import_attribute(name)
+
+
+__all__ = [
+    "TitanTakeoffPro",
+]

libs/langchain/langchain/python.py

@@ -1,4 +1,21 @@
 """For backwards compatibility."""
-from langchain_community.utilities.python import PythonREPL
+from typing import TYPE_CHECKING, Any
+
+from langchain._api import create_importer
+
+if TYPE_CHECKING:
+    from langchain_community.utilities.python import PythonREPL
+
+
+_importer = create_importer(
+    __package__,
+    deprecated_lookups={"PythonREPL": "langchain_community.utilities.python"},
+)
+
+
+def __getattr__(name: str) -> Any:
+    """Look up attributes dynamically."""
+    return _importer(name)
+
 
 __all__ = ["PythonREPL"]

libs/langchain/langchain/tools/ainetwork/app.py

@@ -1,7 +0,0 @@
-from langchain_community.tools.ainetwork.app import (
-    AINAppOps,
-    AppOperationType,
-    AppSchema,
-)
-
-__all__ = ["AppOperationType", "AppSchema", "AINAppOps"]

libs/langchain/langchain/tools/ainetwork/base.py

@@ -1,3 +0,0 @@
-from langchain_community.tools.ainetwork.base import AINBaseTool, OperationType
-
-__all__ = ["OperationType", "AINBaseTool"]

libs/langchain/langchain/tools/ainetwork/owner.py

@@ -1,3 +0,0 @@
-from langchain_community.tools.ainetwork.owner import AINOwnerOps, RuleSchema
-
-__all__ = ["RuleSchema", "AINOwnerOps"]

libs/langchain/langchain/tools/ainetwork/rule.py

@@ -1,3 +0,0 @@
-from langchain_community.tools.ainetwork.rule import AINRuleOps, RuleSchema
-
-__all__ = ["RuleSchema", "AINRuleOps"]

libs/langchain/langchain/tools/ainetwork/transfer.py

@@ -1,3 +0,0 @@
-from langchain_community.tools.ainetwork.transfer import AINTransfer, TransferSchema
-
-__all__ = ["TransferSchema", "AINTransfer"]

libs/langchain/langchain/tools/ainetwork/value.py

@@ -1,3 +0,0 @@
-from langchain_community.tools.ainetwork.value import AINValueOps, ValueSchema
-
-__all__ = ["ValueSchema", "AINValueOps"]

libs/langchain/langchain/tools/sql_database/prompt.py

@@ -1,3 +1,23 @@
-from langchain_community.tools.sql_database.prompt import QUERY_CHECKER
+"""For backwards compatibility."""
+from typing import TYPE_CHECKING, Any
+
+from langchain._api import create_importer
+
+if TYPE_CHECKING:
+    from langchain_community.tools.sql_database.prompt import QUERY_CHECKER
+
+
+_importer = create_importer(
+    __package__,
+    deprecated_lookups={
+        "QUERY_CHECKER": "langchain_community.tools.sql_database.prompt",
+    },
+)
+
+
+def __getattr__(name: str) -> Any:
+    """Look up attributes dynamically."""
+    return _importer(name)
+
 
 __all__ = ["QUERY_CHECKER"]

libs/langchain/langchain/utilities/python.py

@@ -1,3 +1,21 @@
-from langchain_community.utilities.python import PythonREPL
+"""For backwards compatibility."""
+from typing import TYPE_CHECKING, Any
+
+from langchain._api import create_importer
+
+if TYPE_CHECKING:
+    from langchain_community.utilities.python import PythonREPL
+
+
+_importer = create_importer(
+    __package__,
+    deprecated_lookups={"PythonREPL": "langchain_community.utilities.python"},
+)
+
+
+def __getattr__(name: str) -> Any:
+    """Look up attributes dynamically."""
+    return _importer(name)
+
 
 __all__ = ["PythonREPL"]