62 lines
2.7 KiB
TypeScript
62 lines
2.7 KiB
TypeScript
import { ChatOpenAI as LangchainChatOpenAI, OpenAIChatInput } from 'langchain/chat_models/openai'
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import { BaseChatModelParams } from 'langchain/chat_models/base'
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import type { ClientOptions } from 'openai'
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import type { LegacyOpenAIInput } from '@langchain/openai/dist/types'
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import { BaseLanguageModelInput } from 'langchain/base_language'
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import { ChatOpenAICallOptions } from '@langchain/openai/dist/chat_models'
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import { BaseMessageChunk, BaseMessageLike, HumanMessage, LLMResult } from 'langchain/schema'
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import { Callbacks } from '@langchain/core/callbacks/manager'
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import { IMultiModalOption } from '../../../src'
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import { addImagesToMessages, MultiModalOptions } from '../../../src/multiModalUtils'
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export class ChatOpenAI extends LangchainChatOpenAI {
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configuredModel: string
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configuredMaxToken?: number
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multiModalOption?: IMultiModalOption
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id: string
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constructor(
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id: string,
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fields?: Partial<OpenAIChatInput> & BaseChatModelParams & { openAIApiKey?: string; multiModalOption?: IMultiModalOption },
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/** @deprecated */
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configuration?: ClientOptions & LegacyOpenAIInput
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) {
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super(fields, configuration)
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this.id = id
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this.multiModalOption = fields?.multiModalOption
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this.configuredModel = fields?.modelName ?? 'gpt-3.5-turbo'
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this.configuredMaxToken = fields?.maxTokens
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}
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async invoke(input: BaseLanguageModelInput, options?: ChatOpenAICallOptions): Promise<BaseMessageChunk> {
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return super.invoke(input, options)
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}
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async generate(messages: BaseMessageLike[][], options?: string[] | ChatOpenAICallOptions, callbacks?: Callbacks): Promise<LLMResult> {
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if (this.lc_kwargs.chainData) {
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await this.injectMultiModalMessages(messages, this.lc_kwargs.chainData)
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}
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return super.generate(messages, options, callbacks)
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}
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private async injectMultiModalMessages(messages: BaseMessageLike[][], options: MultiModalOptions) {
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const optionsData = options.nodeOptions
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const messageContent = addImagesToMessages(optionsData, this.multiModalOption)
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if (messageContent?.length) {
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if (messages[0].length > 0 && messages[0][messages[0].length - 1] instanceof HumanMessage) {
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// Change model to gpt-4-vision
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this.modelName = 'gpt-4-vision-preview'
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// Change default max token to higher when using gpt-4-vision
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this.maxTokens = 1024
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messages[0].push(new HumanMessage({ content: messageContent }))
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}
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} else {
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// revert to previous values if image upload is empty
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this.modelName = this.configuredModel
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this.maxTokens = this.configuredMaxToken
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}
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}
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}
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