Class: LLMChain

chains.LLMChain

Chain to run queries against LLMs.

Example

import { LLMChain } from "langchain/chains";
import { OpenAI } from "langchain/llms/openai";
import { PromptTemplate } from "langchain/prompts";
const prompt = PromptTemplate.fromTemplate("Tell me a {adjective} joke");
const llm = LLMChain({ llm: new OpenAI(), prompt });

Hierarchy

• BaseChain

  ↳ LLMChain

  ↳↳ ConversationChain

Implements

• LLMChainInput

Constructors

constructor

• new LLMChain(fields)

Parameters

Name	Type
fields	LLMChainInput

Overrides

BaseChain.constructor

Defined in

langchain/src/chains/llm_chain.ts:54

Properties

callbackManager

• callbackManager: CallbackManager

Implementation of

LLMChainInput.callbackManager

Inherited from

BaseChain.callbackManager

Defined in

langchain/src/chains/base.ts:25

---

llm

• llm: BaseLanguageModel

Implementation of

LLMChainInput.llm

Defined in

langchain/src/chains/llm_chain.ts:44

---

memory

• Optional memory: BaseMemory

Implementation of

LLMChainInput.memory

Inherited from

BaseChain.memory

Defined in

langchain/src/chains/base.ts:21

---

outputKey

• outputKey: string = "text"

Implementation of

LLMChainInput.outputKey

Defined in

langchain/src/chains/llm_chain.ts:46

---

outputParser

• Optional outputParser: BaseOutputParser

Implementation of

LLMChainInput.outputParser

Defined in

langchain/src/chains/llm_chain.ts:48

---

prompt

• prompt: BasePromptTemplate

Implementation of

LLMChainInput.prompt

Defined in

langchain/src/chains/llm_chain.ts:42

---

verbose

• verbose: boolean

Implementation of

LLMChainInput.verbose

Inherited from

BaseChain.verbose

Defined in

langchain/src/chains/base.ts:23

Accessors

inputKeys

• get inputKeys(): string[]

Returns

string[]

Overrides

BaseChain.inputKeys

Defined in

langchain/src/chains/llm_chain.ts:50

Methods

_call

▸ _call(values): Promise<ChainValues>

Run the core logic of this chain and return the output

Parameters

Name	Type
values	ChainValues

Returns

Promise<ChainValues>

Overrides

BaseChain._call

Defined in

langchain/src/chains/llm_chain.ts:85

---

_chainType

▸ _chainType(): "llm_chain"

Return the string type key uniquely identifying this class of chain.

Returns

"llm_chain"

Overrides

BaseChain._chainType

Defined in

langchain/src/chains/llm_chain.ts:113

---

_getFinalOutput

▸ _getFinalOutput(generations, promptValue): Promise<unknown>

Parameters

Name	Type
generations	Generation[]
promptValue	BasePromptValue

Returns

Promise<unknown>

Defined in

langchain/src/chains/llm_chain.ts:68

---

apply

▸ apply(inputs): Promise<ChainValues>

Call the chain on all inputs in the list

Parameters

Name	Type
inputs	ChainValues[]

Returns

Promise<ChainValues>

Inherited from

BaseChain.apply

Defined in

langchain/src/chains/base.ts:109

---

call

▸ call(values): Promise<ChainValues>

Run the core logic of this chain and add to output if desired.

Wraps _call and handles memory.

Parameters

Name	Type
values	ChainValues

Returns

Promise<ChainValues>

Inherited from

BaseChain.call

Defined in

langchain/src/chains/base.ts:79

---

predict

▸ predict(values): Promise<string>

Format prompt with values and pass to LLM

Example

llm.predict({ adjective: "funny" })

Parameters

Name	Type	Description
values	ChainValues	keys to pass to prompt template

Returns

Promise<string>

Completion from LLM.

Defined in

langchain/src/chains/llm_chain.ts:108

---

run

▸ run(input): Promise<string>

Parameters

Name	Type
input	any

Returns

Promise<string>

Inherited from

BaseChain.run

Defined in

langchain/src/chains/base.ts:55

---

serialize

▸ serialize(): SerializedLLMChain

Return a json-like object representing this chain.

Returns

SerializedLLMChain

Overrides

BaseChain.serialize

Defined in

langchain/src/chains/llm_chain.ts:132

---

deserialize

▸ Static deserialize(data): Promise<LLMChain>

Load a chain from a json-like object describing it.

Parameters

Name	Type
data	SerializedLLMChain

Returns

Promise<LLMChain>

Overrides

BaseChain.deserialize

Defined in

langchain/src/chains/llm_chain.ts:117