langchain.agents.mrkl.base
.MRKLChain¶
Note
MRKLChain implements the standard Runnable Interface
. 🏃
The Runnable Interface
has additional methods that are available on runnables, such as with_types
, with_retry
, assign
, bind
, get_graph
, and more.
- class langchain.agents.mrkl.base.MRKLChain[source]¶
Bases:
AgentExecutor
Deprecated since version 0.1.0.
Chain that implements the MRKL system.
- param agent: Union[BaseSingleActionAgent, BaseMultiActionAgent, Runnable] [Required]¶
The agent to run for creating a plan and determining actions to take at each step of the execution loop.
- param callback_manager: Optional[BaseCallbackManager] = None¶
[DEPRECATED] Use callbacks instead.
- param callbacks: Callbacks = None¶
Optional list of callback handlers (or callback manager). Defaults to None. Callback handlers are called throughout the lifecycle of a call to a chain, starting with on_chain_start, ending with on_chain_end or on_chain_error. Each custom chain can optionally call additional callback methods, see Callback docs for full details.
- param early_stopping_method: str = 'force'¶
The method to use for early stopping if the agent never returns AgentFinish. Either ‘force’ or ‘generate’.
- “force” returns a string saying that it stopped because it met a
time or iteration limit.
- “generate” calls the agent’s LLM Chain one final time to generate
a final answer based on the previous steps.
- param handle_parsing_errors: Union[bool, str, Callable[[OutputParserException], str]] = False¶
How to handle errors raised by the agent’s output parser. Defaults to False, which raises the error. If true, the error will be sent back to the LLM as an observation. If a string, the string itself will be sent to the LLM as an observation. If a callable function, the function will be called with the exception
- as an argument, and the result of that function will be passed to the agent
as an observation.
- param max_execution_time: Optional[float] = None¶
The maximum amount of wall clock time to spend in the execution loop.
- param max_iterations: Optional[int] = 15¶
The maximum number of steps to take before ending the execution loop.
Setting to ‘None’ could lead to an infinite loop.
- param memory: Optional[BaseMemory] = None¶
Optional memory object. Defaults to None. Memory is a class that gets called at the start and at the end of every chain. At the start, memory loads variables and passes them along in the chain. At the end, it saves any returned variables. There are many different types of memory - please see memory docs for the full catalog.
- param metadata: Optional[Dict[str, Any]] = None¶
Optional metadata associated with the chain. Defaults to None. This metadata will be associated with each call to this chain, and passed as arguments to the handlers defined in callbacks. You can use these to eg identify a specific instance of a chain with its use case.
- param return_intermediate_steps: bool = False¶
Whether to return the agent’s trajectory of intermediate steps at the end in addition to the final output.
- param tags: Optional[List[str]] = None¶
Optional list of tags associated with the chain. Defaults to None. These tags will be associated with each call to this chain, and passed as arguments to the handlers defined in callbacks. You can use these to eg identify a specific instance of a chain with its use case.
- param trim_intermediate_steps: Union[int, Callable[[List[Tuple[AgentAction, str]]], List[Tuple[AgentAction, str]]]] = -1¶
How to trim the intermediate steps before returning them. Defaults to -1, which means no trimming.
- param verbose: bool [Optional]¶
Whether or not run in verbose mode. In verbose mode, some intermediate logs will be printed to the console. Defaults to the global verbose value, accessible via langchain.globals.get_verbose().
- __call__(inputs: Union[Dict[str, Any], Any], return_only_outputs: bool = False, callbacks: Optional[Union[List[BaseCallbackHandler], BaseCallbackManager]] = None, *, tags: Optional[List[str]] = None, metadata: Optional[Dict[str, Any]] = None, run_name: Optional[str] = None, include_run_info: bool = False) Dict[str, Any] ¶
Deprecated since version langchain==0.1.0: Use
invoke
instead.Execute the chain.
- Parameters
inputs (Union[Dict[str, Any], Any]) – Dictionary of inputs, or single input if chain expects only one param. Should contain all inputs specified in Chain.input_keys except for inputs that will be set by the chain’s memory.
return_only_outputs (bool) – Whether to return only outputs in the response. If True, only new keys generated by this chain will be returned. If False, both input keys and new keys generated by this chain will be returned. Defaults to False.
callbacks (Optional[Union[List[BaseCallbackHandler], BaseCallbackManager]]) – Callbacks to use for this chain run. These will be called in addition to callbacks passed to the chain during construction, but only these runtime callbacks will propagate to calls to other objects.
tags (Optional[List[str]]) – List of string tags to pass to all callbacks. These will be passed in addition to tags passed to the chain during construction, but only these runtime tags will propagate to calls to other objects.
metadata (Optional[Dict[str, Any]]) – Optional metadata associated with the chain. Defaults to None
include_run_info (bool) – Whether to include run info in the response. Defaults to False.
run_name (Optional[str]) –
- Returns
- A dict of named outputs. Should contain all outputs specified in
Chain.output_keys.
- Return type
Dict[str, Any]
- async abatch(inputs: List[Input], config: Optional[Union[RunnableConfig, List[RunnableConfig]]] = None, *, return_exceptions: bool = False, **kwargs: Optional[Any]) List[Output] ¶
Default implementation runs ainvoke in parallel using asyncio.gather.
The default implementation of batch works well for IO bound runnables.
Subclasses should override this method if they can batch more efficiently; e.g., if the underlying Runnable uses an API which supports a batch mode.
- Parameters
inputs (List[Input]) – A list of inputs to the Runnable.
config (Optional[Union[RunnableConfig, List[RunnableConfig]]]) – A config to use when invoking the Runnable. The config supports standard keys like ‘tags’, ‘metadata’ for tracing purposes, ‘max_concurrency’ for controlling how much work to do in parallel, and other keys. Please refer to the RunnableConfig for more details. Defaults to None.
return_exceptions (bool) – Whether to return exceptions instead of raising them. Defaults to False.
kwargs (Optional[Any]) – Additional keyword arguments to pass to the Runnable.
- Returns
A list of outputs from the Runnable.
- Return type
List[Output]
- async abatch_as_completed(inputs: Sequence[Input], config: Optional[Union[RunnableConfig, Sequence[RunnableConfig]]] = None, *, return_exceptions: bool = False, **kwargs: Optional[Any]) AsyncIterator[Tuple[int, Union[Output, Exception]]] ¶
Run ainvoke in parallel on a list of inputs, yielding results as they complete.
- Parameters
inputs (Sequence[Input]) – A list of inputs to the Runnable.
config (Optional[Union[RunnableConfig, Sequence[RunnableConfig]]]) – A config to use when invoking the Runnable. The config supports standard keys like ‘tags’, ‘metadata’ for tracing purposes, ‘max_concurrency’ for controlling how much work to do in parallel, and other keys. Please refer to the RunnableConfig for more details. Defaults to None. Defaults to None.
return_exceptions (bool) – Whether to return exceptions instead of raising them. Defaults to False.
kwargs (Optional[Any]) – Additional keyword arguments to pass to the Runnable.
- Yields
A tuple of the index of the input and the output from the Runnable.
- Return type
AsyncIterator[Tuple[int, Union[Output, Exception]]]
- async acall(inputs: Union[Dict[str, Any], Any], return_only_outputs: bool = False, callbacks: Optional[Union[List[BaseCallbackHandler], BaseCallbackManager]] = None, *, tags: Optional[List[str]] = None, metadata: Optional[Dict[str, Any]] = None, run_name: Optional[str] = None, include_run_info: bool = False) Dict[str, Any] ¶
Deprecated since version langchain==0.1.0: Use
ainvoke
instead.Asynchronously execute the chain.
- Parameters
inputs (Union[Dict[str, Any], Any]) – Dictionary of inputs, or single input if chain expects only one param. Should contain all inputs specified in Chain.input_keys except for inputs that will be set by the chain’s memory.
return_only_outputs (bool) – Whether to return only outputs in the response. If True, only new keys generated by this chain will be returned. If False, both input keys and new keys generated by this chain will be returned. Defaults to False.
callbacks (Optional[Union[List[BaseCallbackHandler], BaseCallbackManager]]) – Callbacks to use for this chain run. These will be called in addition to callbacks passed to the chain during construction, but only these runtime callbacks will propagate to calls to other objects.
tags (Optional[List[str]]) – List of string tags to pass to all callbacks. These will be passed in addition to tags passed to the chain during construction, but only these runtime tags will propagate to calls to other objects.
metadata (Optional[Dict[str, Any]]) – Optional metadata associated with the chain. Defaults to None
include_run_info (bool) – Whether to include run info in the response. Defaults to False.
run_name (Optional[str]) –
- Returns
- A dict of named outputs. Should contain all outputs specified in
Chain.output_keys.
- Return type
Dict[str, Any]
- async ainvoke(input: Dict[str, Any], config: Optional[RunnableConfig] = None, **kwargs: Any) Dict[str, Any] ¶
Default implementation of ainvoke, calls invoke from a thread.
The default implementation allows usage of async code even if the Runnable did not implement a native async version of invoke.
Subclasses should override this method if they can run asynchronously.
- Parameters
input (Dict[str, Any]) –
config (Optional[RunnableConfig]) –
kwargs (Any) –
- Return type
Dict[str, Any]
- apply(input_list: List[Dict[str, Any]], callbacks: Optional[Union[List[BaseCallbackHandler], BaseCallbackManager]] = None) List[Dict[str, str]] ¶
Deprecated since version langchain==0.1.0: Use
batch
instead.Call the chain on all inputs in the list.
- Parameters
input_list (List[Dict[str, Any]]) –
callbacks (Optional[Union[List[BaseCallbackHandler], BaseCallbackManager]]) –
- Return type
List[Dict[str, str]]
- async aprep_inputs(inputs: Union[Dict[str, Any], Any]) Dict[str, str] ¶
Prepare chain inputs, including adding inputs from memory.
- Parameters
inputs (Union[Dict[str, Any], Any]) – Dictionary of raw inputs, or single input if chain expects only one param. Should contain all inputs specified in Chain.input_keys except for inputs that will be set by the chain’s memory.
- Returns
A dictionary of all inputs, including those added by the chain’s memory.
- Return type
Dict[str, str]
- async aprep_outputs(inputs: Dict[str, str], outputs: Dict[str, str], return_only_outputs: bool = False) Dict[str, str] ¶
Validate and prepare chain outputs, and save info about this run to memory.
- Parameters
inputs (Dict[str, str]) – Dictionary of chain inputs, including any inputs added by chain memory.
outputs (Dict[str, str]) – Dictionary of initial chain outputs.
return_only_outputs (bool) – Whether to only return the chain outputs. If False, inputs are also added to the final outputs.
- Returns
A dict of the final chain outputs.
- Return type
Dict[str, str]
- async arun(*args: Any, callbacks: Optional[Union[List[BaseCallbackHandler], BaseCallbackManager]] = None, tags: Optional[List[str]] = None, metadata: Optional[Dict[str, Any]] = None, **kwargs: Any) Any ¶
Deprecated since version langchain==0.1.0: Use
ainvoke
instead.Convenience method for executing chain.
The main difference between this method and Chain.__call__ is that this method expects inputs to be passed directly in as positional arguments or keyword arguments, whereas Chain.__call__ expects a single input dictionary with all the inputs
- Parameters
*args (Any) – If the chain expects a single input, it can be passed in as the sole positional argument.
callbacks (Optional[Union[List[BaseCallbackHandler], BaseCallbackManager]]) – Callbacks to use for this chain run. These will be called in addition to callbacks passed to the chain during construction, but only these runtime callbacks will propagate to calls to other objects.
tags (Optional[List[str]]) – List of string tags to pass to all callbacks. These will be passed in addition to tags passed to the chain during construction, but only these runtime tags will propagate to calls to other objects.
**kwargs (Any) – If the chain expects multiple inputs, they can be passed in directly as keyword arguments.
metadata (Optional[Dict[str, Any]]) –
**kwargs –
- Returns
The chain output.
- Return type
Any
Example
# Suppose we have a single-input chain that takes a 'question' string: await chain.arun("What's the temperature in Boise, Idaho?") # -> "The temperature in Boise is..." # Suppose we have a multi-input chain that takes a 'question' string # and 'context' string: question = "What's the temperature in Boise, Idaho?" context = "Weather report for Boise, Idaho on 07/03/23..." await chain.arun(question=question, context=context) # -> "The temperature in Boise is..."
- as_tool(args_schema: Optional[Type[BaseModel]] = None, *, name: Optional[str] = None, description: Optional[str] = None, arg_types: Optional[Dict[str, Type]] = None) BaseTool ¶
Beta
This API is in beta and may change in the future.
Create a BaseTool from a Runnable.
as_tool
will instantiate a BaseTool with a name, description, andargs_schema
from a Runnable. Where possible, schemas are inferred fromrunnable.get_input_schema
. Alternatively (e.g., if the Runnable takes a dict as input and the specific dict keys are not typed), the schema can be specified directly withargs_schema
. You can also passarg_types
to just specify the required arguments and their types.- Parameters
args_schema (Optional[Type[BaseModel]]) – The schema for the tool. Defaults to None.
name (Optional[str]) – The name of the tool. Defaults to None.
description (Optional[str]) – The description of the tool. Defaults to None.
arg_types (Optional[Dict[str, Type]]) – A dictionary of argument names to types. Defaults to None.
- Returns
A BaseTool instance.
- Return type
Typed dict input:
from typing import List from typing_extensions import TypedDict from langchain_core.runnables import RunnableLambda class Args(TypedDict): a: int b: List[int] def f(x: Args) -> str: return str(x["a"] * max(x["b"])) runnable = RunnableLambda(f) as_tool = runnable.as_tool() as_tool.invoke({"a": 3, "b": [1, 2]})
dict
input, specifying schema viaargs_schema
:from typing import Any, Dict, List from langchain_core.pydantic_v1 import BaseModel, Field from langchain_core.runnables import RunnableLambda def f(x: Dict[str, Any]) -> str: return str(x["a"] * max(x["b"])) class FSchema(BaseModel): """Apply a function to an integer and list of integers.""" a: int = Field(..., description="Integer") b: List[int] = Field(..., description="List of ints") runnable = RunnableLambda(f) as_tool = runnable.as_tool(FSchema) as_tool.invoke({"a": 3, "b": [1, 2]})
dict
input, specifying schema viaarg_types
:from typing import Any, Dict, List from langchain_core.runnables import RunnableLambda def f(x: Dict[str, Any]) -> str: return str(x["a"] * max(x["b"])) runnable = RunnableLambda(f) as_tool = runnable.as_tool(arg_types={"a": int, "b": List[int]}) as_tool.invoke({"a": 3, "b": [1, 2]})
String input:
from langchain_core.runnables import RunnableLambda def f(x: str) -> str: return x + "a" def g(x: str) -> str: return x + "z" runnable = RunnableLambda(f) | g as_tool = runnable.as_tool() as_tool.invoke("b")
New in version 0.2.14.
- async astream(input: Union[Dict[str, Any], Any], config: Optional[RunnableConfig] = None, **kwargs: Any) AsyncIterator[AddableDict] ¶
Async enables streaming over steps taken to reach final output.
- Parameters
input (Union[Dict[str, Any], Any]) – Input to the agent.
config (Optional[RunnableConfig]) – Config to use.
kwargs (Any) – Additional arguments.
- Yields
AddableDict – Addable dictionary.
- Return type
AsyncIterator[AddableDict]
- astream_events(input: Any, config: Optional[RunnableConfig] = None, *, version: Literal['v1', 'v2'], include_names: Optional[Sequence[str]] = None, include_types: Optional[Sequence[str]] = None, include_tags: Optional[Sequence[str]] = None, exclude_names: Optional[Sequence[str]] = None, exclude_types: Optional[Sequence[str]] = None, exclude_tags: Optional[Sequence[str]] = None, **kwargs: Any) AsyncIterator[Union[StandardStreamEvent, CustomStreamEvent]] ¶
Beta
This API is in beta and may change in the future.
Generate a stream of events.
Use to create an iterator over StreamEvents that provide real-time information about the progress of the Runnable, including StreamEvents from intermediate results.
A StreamEvent is a dictionary with the following schema:
event
: str - Event names are of theformat: on_[runnable_type]_(start|stream|end).
name
: str - The name of the Runnable that generated the event.run_id
: str - randomly generated ID associated with the given execution ofthe Runnable that emitted the event. A child Runnable that gets invoked as part of the execution of a parent Runnable is assigned its own unique ID.
parent_ids
: List[str] - The IDs of the parent runnables thatgenerated the event. The root Runnable will have an empty list. The order of the parent IDs is from the root to the immediate parent. Only available for v2 version of the API. The v1 version of the API will return an empty list.
tags
: Optional[List[str]] - The tags of the Runnable that generatedthe event.
metadata
: Optional[Dict[str, Any]] - The metadata of the Runnablethat generated the event.
data
: Dict[str, Any]
Below is a table that illustrates some evens that might be emitted by various chains. Metadata fields have been omitted from the table for brevity. Chain definitions have been included after the table.
ATTENTION This reference table is for the V2 version of the schema.
event
name
chunk
input
output
on_chat_model_start
[model name]
{“messages”: [[SystemMessage, HumanMessage]]}
on_chat_model_stream
[model name]
AIMessageChunk(content=”hello”)
on_chat_model_end
[model name]
{“messages”: [[SystemMessage, HumanMessage]]}
AIMessageChunk(content=”hello world”)
on_llm_start
[model name]
{‘input’: ‘hello’}
on_llm_stream
[model name]
‘Hello’
on_llm_end
[model name]
‘Hello human!’
on_chain_start
format_docs
on_chain_stream
format_docs
“hello world!, goodbye world!”
on_chain_end
format_docs
[Document(…)]
“hello world!, goodbye world!”
on_tool_start
some_tool
{“x”: 1, “y”: “2”}
on_tool_end
some_tool
{“x”: 1, “y”: “2”}
on_retriever_start
[retriever name]
{“query”: “hello”}
on_retriever_end
[retriever name]
{“query”: “hello”}
[Document(…), ..]
on_prompt_start
[template_name]
{“question”: “hello”}
on_prompt_end
[template_name]
{“question”: “hello”}
ChatPromptValue(messages: [SystemMessage, …])
In addition to the standard events, users can also dispatch custom events (see example below).
Custom events will be only be surfaced with in the v2 version of the API!
A custom event has following format:
Attribute
Type
Description
name
str
A user defined name for the event.
data
Any
The data associated with the event. This can be anything, though we suggest making it JSON serializable.
Here are declarations associated with the standard events shown above:
format_docs:
def format_docs(docs: List[Document]) -> str: '''Format the docs.''' return ", ".join([doc.page_content for doc in docs]) format_docs = RunnableLambda(format_docs)
some_tool:
@tool def some_tool(x: int, y: str) -> dict: '''Some_tool.''' return {"x": x, "y": y}
prompt:
template = ChatPromptTemplate.from_messages( [("system", "You are Cat Agent 007"), ("human", "{question}")] ).with_config({"run_name": "my_template", "tags": ["my_template"]})
Example:
from langchain_core.runnables import RunnableLambda async def reverse(s: str) -> str: return s[::-1] chain = RunnableLambda(func=reverse) events = [ event async for event in chain.astream_events("hello", version="v2") ] # will produce the following events (run_id, and parent_ids # has been omitted for brevity): [ { "data": {"input": "hello"}, "event": "on_chain_start", "metadata": {}, "name": "reverse", "tags": [], }, { "data": {"chunk": "olleh"}, "event": "on_chain_stream", "metadata": {}, "name": "reverse", "tags": [], }, { "data": {"output": "olleh"}, "event": "on_chain_end", "metadata": {}, "name": "reverse", "tags": [], }, ]
Example: Dispatch Custom Event
from langchain_core.callbacks.manager import ( adispatch_custom_event, ) from langchain_core.runnables import RunnableLambda, RunnableConfig import asyncio async def slow_thing(some_input: str, config: RunnableConfig) -> str: """Do something that takes a long time.""" await asyncio.sleep(1) # Placeholder for some slow operation await adispatch_custom_event( "progress_event", {"message": "Finished step 1 of 3"}, config=config # Must be included for python < 3.10 ) await asyncio.sleep(1) # Placeholder for some slow operation await adispatch_custom_event( "progress_event", {"message": "Finished step 2 of 3"}, config=config # Must be included for python < 3.10 ) await asyncio.sleep(1) # Placeholder for some slow operation return "Done" slow_thing = RunnableLambda(slow_thing) async for event in slow_thing.astream_events("some_input", version="v2"): print(event)
- Parameters
input (Any) – The input to the Runnable.
config (Optional[RunnableConfig]) – The config to use for the Runnable.
version (Literal['v1', 'v2']) – The version of the schema to use either v2 or v1. Users should use v2. v1 is for backwards compatibility and will be deprecated in 0.4.0. No default will be assigned until the API is stabilized. custom events will only be surfaced in v2.
include_names (Optional[Sequence[str]]) – Only include events from runnables with matching names.
include_types (Optional[Sequence[str]]) – Only include events from runnables with matching types.
include_tags (Optional[Sequence[str]]) – Only include events from runnables with matching tags.
exclude_names (Optional[Sequence[str]]) – Exclude events from runnables with matching names.
exclude_types (Optional[Sequence[str]]) – Exclude events from runnables with matching types.
exclude_tags (Optional[Sequence[str]]) – Exclude events from runnables with matching tags.
kwargs (Any) – Additional keyword arguments to pass to the Runnable. These will be passed to astream_log as this implementation of astream_events is built on top of astream_log.
- Yields
An async stream of StreamEvents.
- Raises
NotImplementedError – If the version is not v1 or v2.
- Return type
AsyncIterator[Union[StandardStreamEvent, CustomStreamEvent]]
- batch(inputs: List[Input], config: Optional[Union[RunnableConfig, List[RunnableConfig]]] = None, *, return_exceptions: bool = False, **kwargs: Optional[Any]) List[Output] ¶
Default implementation runs invoke in parallel using a thread pool executor.
The default implementation of batch works well for IO bound runnables.
Subclasses should override this method if they can batch more efficiently; e.g., if the underlying Runnable uses an API which supports a batch mode.
- Parameters
inputs (List[Input]) –
config (Optional[Union[RunnableConfig, List[RunnableConfig]]]) –
return_exceptions (bool) –
kwargs (Optional[Any]) –
- Return type
List[Output]
- batch_as_completed(inputs: Sequence[Input], config: Optional[Union[RunnableConfig, Sequence[RunnableConfig]]] = None, *, return_exceptions: bool = False, **kwargs: Optional[Any]) Iterator[Tuple[int, Union[Output, Exception]]] ¶
Run invoke in parallel on a list of inputs, yielding results as they complete.
- Parameters
inputs (Sequence[Input]) –
config (Optional[Union[RunnableConfig, Sequence[RunnableConfig]]]) –
return_exceptions (bool) –
kwargs (Optional[Any]) –
- Return type
Iterator[Tuple[int, Union[Output, Exception]]]
- configurable_alternatives(which: ConfigurableField, *, default_key: str = 'default', prefix_keys: bool = False, **kwargs: Union[Runnable[Input, Output], Callable[[], Runnable[Input, Output]]]) RunnableSerializable[Input, Output] ¶
Configure alternatives for Runnables that can be set at runtime.
- Parameters
which (ConfigurableField) – The ConfigurableField instance that will be used to select the alternative.
default_key (str) – The default key to use if no alternative is selected. Defaults to “default”.
prefix_keys (bool) – Whether to prefix the keys with the ConfigurableField id. Defaults to False.
**kwargs (Union[Runnable[Input, Output], Callable[[], Runnable[Input, Output]]]) – A dictionary of keys to Runnable instances or callables that return Runnable instances.
- Returns
A new Runnable with the alternatives configured.
- Return type
RunnableSerializable[Input, Output]
from langchain_anthropic import ChatAnthropic from langchain_core.runnables.utils import ConfigurableField from langchain_openai import ChatOpenAI model = ChatAnthropic( model_name="claude-3-sonnet-20240229" ).configurable_alternatives( ConfigurableField(id="llm"), default_key="anthropic", openai=ChatOpenAI() ) # uses the default model ChatAnthropic print(model.invoke("which organization created you?").content) # uses ChatOpenAI print( model.with_config( configurable={"llm": "openai"} ).invoke("which organization created you?").content )
- configurable_fields(**kwargs: Union[ConfigurableField, ConfigurableFieldSingleOption, ConfigurableFieldMultiOption]) RunnableSerializable[Input, Output] ¶
Configure particular Runnable fields at runtime.
- Parameters
**kwargs (Union[ConfigurableField, ConfigurableFieldSingleOption, ConfigurableFieldMultiOption]) – A dictionary of ConfigurableField instances to configure.
- Returns
A new Runnable with the fields configured.
- Return type
RunnableSerializable[Input, Output]
from langchain_core.runnables import ConfigurableField from langchain_openai import ChatOpenAI model = ChatOpenAI(max_tokens=20).configurable_fields( max_tokens=ConfigurableField( id="output_token_number", name="Max tokens in the output", description="The maximum number of tokens in the output", ) ) # max_tokens = 20 print( "max_tokens_20: ", model.invoke("tell me something about chess").content ) # max_tokens = 200 print("max_tokens_200: ", model.with_config( configurable={"output_token_number": 200} ).invoke("tell me something about chess").content )
- classmethod from_agent_and_tools(agent: Union[BaseSingleActionAgent, BaseMultiActionAgent, Runnable], tools: Sequence[BaseTool], callbacks: Optional[Union[List[BaseCallbackHandler], BaseCallbackManager]] = None, **kwargs: Any) AgentExecutor ¶
Create from agent and tools.
- Parameters
agent (Union[BaseSingleActionAgent, BaseMultiActionAgent, Runnable]) – Agent to use.
tools (Sequence[BaseTool]) – Tools to use.
callbacks (Optional[Union[List[BaseCallbackHandler], BaseCallbackManager]]) – Callbacks to use.
kwargs (Any) – Additional arguments.
- Returns
Agent executor object.
- Return type
- classmethod from_chains(llm: BaseLanguageModel, chains: List[ChainConfig], **kwargs: Any) AgentExecutor [source]¶
User-friendly way to initialize the MRKL chain.
This is intended to be an easy way to get up and running with the MRKL chain.
- Parameters
llm (BaseLanguageModel) – The LLM to use as the agent LLM.
chains (List[ChainConfig]) – The chains the MRKL system has access to.
**kwargs (Any) – parameters to be passed to initialization.
- Returns
An initialized MRKL chain.
- Return type
- invoke(input: Dict[str, Any], config: Optional[RunnableConfig] = None, **kwargs: Any) Dict[str, Any] ¶
Transform a single input into an output. Override to implement.
- Parameters
input (Dict[str, Any]) – The input to the Runnable.
config (Optional[RunnableConfig]) – A config to use when invoking the Runnable. The config supports standard keys like ‘tags’, ‘metadata’ for tracing purposes, ‘max_concurrency’ for controlling how much work to do in parallel, and other keys. Please refer to the RunnableConfig for more details.
kwargs (Any) –
- Returns
The output of the Runnable.
- Return type
Dict[str, Any]
- iter(inputs: Any, callbacks: Optional[Union[List[BaseCallbackHandler], BaseCallbackManager]] = None, *, include_run_info: bool = False, async_: bool = False) AgentExecutorIterator ¶
Enables iteration over steps taken to reach final output.
- Parameters
inputs (Any) – Inputs to the agent.
callbacks (Optional[Union[List[BaseCallbackHandler], BaseCallbackManager]]) – Callbacks to run.
include_run_info (bool) – Whether to include run info.
async – Whether to run async. (Ignored)
async_ (bool) –
- Returns
Agent executor iterator object.
- Return type
- lookup_tool(name: str) BaseTool ¶
Lookup tool by name.
- Parameters
name (str) – Name of tool.
- Returns
Tool object.
- Return type
- prep_inputs(inputs: Union[Dict[str, Any], Any]) Dict[str, str] ¶
Prepare chain inputs, including adding inputs from memory.
- Parameters
inputs (Union[Dict[str, Any], Any]) – Dictionary of raw inputs, or single input if chain expects only one param. Should contain all inputs specified in Chain.input_keys except for inputs that will be set by the chain’s memory.
- Returns
A dictionary of all inputs, including those added by the chain’s memory.
- Return type
Dict[str, str]
- prep_outputs(inputs: Dict[str, str], outputs: Dict[str, str], return_only_outputs: bool = False) Dict[str, str] ¶
Validate and prepare chain outputs, and save info about this run to memory.
- Parameters
inputs (Dict[str, str]) – Dictionary of chain inputs, including any inputs added by chain memory.
outputs (Dict[str, str]) – Dictionary of initial chain outputs.
return_only_outputs (bool) – Whether to only return the chain outputs. If False, inputs are also added to the final outputs.
- Returns
A dict of the final chain outputs.
- Return type
Dict[str, str]
- run(*args: Any, callbacks: Optional[Union[List[BaseCallbackHandler], BaseCallbackManager]] = None, tags: Optional[List[str]] = None, metadata: Optional[Dict[str, Any]] = None, **kwargs: Any) Any ¶
Deprecated since version langchain==0.1.0: Use
invoke
instead.Convenience method for executing chain.
The main difference between this method and Chain.__call__ is that this method expects inputs to be passed directly in as positional arguments or keyword arguments, whereas Chain.__call__ expects a single input dictionary with all the inputs
- Parameters
*args (Any) – If the chain expects a single input, it can be passed in as the sole positional argument.
callbacks (Optional[Union[List[BaseCallbackHandler], BaseCallbackManager]]) – Callbacks to use for this chain run. These will be called in addition to callbacks passed to the chain during construction, but only these runtime callbacks will propagate to calls to other objects.
tags (Optional[List[str]]) – List of string tags to pass to all callbacks. These will be passed in addition to tags passed to the chain during construction, but only these runtime tags will propagate to calls to other objects.
**kwargs (Any) – If the chain expects multiple inputs, they can be passed in directly as keyword arguments.
metadata (Optional[Dict[str, Any]]) –
**kwargs –
- Returns
The chain output.
- Return type
Any
Example
# Suppose we have a single-input chain that takes a 'question' string: chain.run("What's the temperature in Boise, Idaho?") # -> "The temperature in Boise is..." # Suppose we have a multi-input chain that takes a 'question' string # and 'context' string: question = "What's the temperature in Boise, Idaho?" context = "Weather report for Boise, Idaho on 07/03/23..." chain.run(question=question, context=context) # -> "The temperature in Boise is..."
- save(file_path: Union[Path, str]) None ¶
Raise error - saving not supported for Agent Executors.
- Parameters
file_path (Union[Path, str]) – Path to save to.
- Raises
ValueError – Saving not supported for agent executors.
- Return type
None
- save_agent(file_path: Union[Path, str]) None ¶
Save the underlying agent.
- Parameters
file_path (Union[Path, str]) – Path to save to.
- Return type
None
- stream(input: Union[Dict[str, Any], Any], config: Optional[RunnableConfig] = None, **kwargs: Any) Iterator[AddableDict] ¶
Enables streaming over steps taken to reach final output.
- Parameters
input (Union[Dict[str, Any], Any]) – Input to the agent.
config (Optional[RunnableConfig]) – Config to use.
kwargs (Any) – Additional arguments.
- Yields
AddableDict – Addable dictionary.
- Return type
Iterator[AddableDict]
- to_json() Union[SerializedConstructor, SerializedNotImplemented] ¶
Serialize the Runnable to JSON.
- Returns
A JSON-serializable representation of the Runnable.
- Return type