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ollama_functions.ts
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/
ollama_functions.ts
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import { BaseChatModel, BaseChatModelParams } from "../../chat_models/base.js";
import { CallbackManagerForLLMRun } from "../../callbacks/manager.js";
import {
AIMessage,
BaseMessage,
ChatResult,
SystemMessage,
} from "../../schema/index.js";
import { ChatOllama } from "../../chat_models/ollama.js";
import { OllamaInput } from "../../util/ollama.js";
import { BaseFunctionCallOptions } from "../../base_language/index.js";
import { PromptTemplate } from "../../prompts/prompt.js";
import type { BasePromptTemplate } from "../../prompts/base.js";
const TOOL_SYSTEM_PROMPT =
/* #__PURE__ */
PromptTemplate.fromTemplate(`You have access to the following tools:
{tools}
To use a tool, respond with a JSON object with the following structure:
{{
"tool": <name of the called tool>,
"tool_input": <parameters for the tool matching the above JSON schema>
}}`);
export interface ChatOllamaFunctionsCallOptions
extends BaseFunctionCallOptions {}
export type OllamaFunctionsInput = Partial<OllamaInput> &
BaseChatModelParams & {
llm?: ChatOllama;
toolSystemPrompt?: BasePromptTemplate;
};
export class OllamaFunctions extends BaseChatModel<ChatOllamaFunctionsCallOptions> {
llm: ChatOllama;
toolSystemPrompt: BasePromptTemplate = TOOL_SYSTEM_PROMPT;
protected defaultResponseFunction = {
name: "__conversational_response",
description:
"Respond conversationally if no other tools should be called for a given query.",
parameters: {
type: "object",
properties: {
response: {
type: "string",
description: "Conversational response to the user.",
},
},
required: ["response"],
},
};
lc_namespace = ["langchain", "experimental", "chat_models"];
static lc_name(): string {
return "OllamaFunctions";
}
constructor(fields?: OllamaFunctionsInput) {
super(fields ?? {});
this.llm = fields?.llm ?? new ChatOllama({ ...fields, format: "json" });
this.toolSystemPrompt = fields?.toolSystemPrompt ?? this.toolSystemPrompt;
}
invocationParams() {
return this.llm.invocationParams();
}
/** @ignore */
_identifyingParams() {
return this.llm._identifyingParams();
}
async _generate(
messages: BaseMessage[],
options: this["ParsedCallOptions"],
runManager?: CallbackManagerForLLMRun | undefined
): Promise<ChatResult> {
let functions = options.functions ?? [];
if (options.function_call !== undefined) {
functions = functions.filter(
(fn) => fn.name === options.function_call?.name
);
if (!functions.length) {
throw new Error(
`If "function_call" is specified, you must also pass a matching function in "functions".`
);
}
} else if (functions.length === 0) {
functions.push(this.defaultResponseFunction);
}
const defaultContent = await TOOL_SYSTEM_PROMPT.format({
tools: JSON.stringify(functions, null, 2),
});
const systemMessage = new SystemMessage({ content: defaultContent });
const chatResult = await this.llm._generate(
[systemMessage, ...messages],
options,
runManager
);
const chatGenerationContent = chatResult.generations[0].message.content;
if (typeof chatGenerationContent !== "string") {
throw new Error("OllamaFunctions does not support non-string output.");
}
let parsedChatResult;
try {
parsedChatResult = JSON.parse(chatGenerationContent);
} catch (e) {
throw new Error(
`"${this.llm.model}" did not respond with valid JSON. Please try again.`
);
}
const calledToolName = parsedChatResult.tool;
const calledToolArguments = parsedChatResult.tool_input;
const calledTool = functions.find((fn) => fn.name === calledToolName);
if (calledTool === undefined) {
throw new Error(
`Failed to parse a function call from ${this.llm.model} output: ${chatGenerationContent}`
);
}
if (calledTool.name === this.defaultResponseFunction.name) {
return {
generations: [
{
message: new AIMessage({
content: calledToolArguments.response,
}),
text: calledToolArguments.response,
},
],
};
}
const responseMessageWithFunctions = new AIMessage({
content: "",
additional_kwargs: {
function_call: {
name: calledToolName,
arguments: calledToolArguments
? JSON.stringify(calledToolArguments)
: "",
},
},
});
return {
generations: [{ message: responseMessageWithFunctions, text: "" }],
};
}
_llmType(): string {
return "ollama_functions";
}
/** @ignore */
_combineLLMOutput() {
return [];
}
}