Update HydeRetriever.ts

Add custom prompt

packages/components/nodes/retrievers/HydeRetriever/HydeRetriever.ts

@@ -1,8 +1,8 @@
 import { VectorStore } from 'langchain/vectorstores/base'
-import { INode, INodeData, INodeParams, HyDERetrieverInput } from '../../../src/Interface'
-import { HydeRetriever } from 'langchain/retrievers/hyde'
+import { INode, INodeData, INodeParams } from '../../../src/Interface'
+import { HydeRetriever, HydeRetrieverOptions, PromptKey } from 'langchain/retrievers/hyde'
 import { BaseLanguageModel } from 'langchain/base_language'
-import { Embeddings } from 'langchain/embeddings/base'
+import { PromptTemplate } from 'langchain/prompts'
 
 class HydeRetriever_Retrievers implements INode {
     label: string
@@ -33,11 +33,6 @@ class HydeRetriever_Retrievers implements INode {
                 name: 'vectorStore',
                 type: 'VectorStore'
             },
-            {
-                label: 'Embeddings',
-                name: 'embeddings',
-                type: 'Embeddings'
-            },
             {
                 label: 'Prompt Key',
                 name: 'promptKey',
@@ -78,6 +73,16 @@ class HydeRetriever_Retrievers implements INode {
                 ],
                 default: 'websearch'
             },
+            {
+                label: 'Custom Prompt',
+                name: 'customPrompt',
+                description: 'If custom prompt is used, this will override Prompt Key',
+                placeholder: 'Please write a passage to answer the question\nQuestion: {question}\nPassage:',
+                type: 'string',
+                rows: 4,
+                additionalParams: true,
+                optional: true
+            },
             {
                 label: 'Top K',
                 name: 'topK',
@@ -94,17 +99,19 @@ class HydeRetriever_Retrievers implements INode {
     async init(nodeData: INodeData): Promise<any> {
         const llm = nodeData.inputs?.model as BaseLanguageModel
         const vectorStore = nodeData.inputs?.vectorStore as VectorStore
-        const embeddings = nodeData.inputs?.embeddings as Embeddings
-        const promptKey = nodeData.inputs?.promptKey as string
-        const topK = nodeData.inputs?.topK as number
+        const promptKey = nodeData.inputs?.promptKey as PromptKey
+        const customPrompt = nodeData.inputs?.customPrompt as string
+        const topK = nodeData.inputs?.topK as string
+        const k = topK ? parseInt(topK, 10) : 4
 
-        const obj = {
+        const obj: HydeRetrieverOptions<any> = {
             llm,
             vectorStore,
-            embeddings,
-            promptKey,
-            topK
-        } as HyDERetrieverInput
+            k
+        }
+
+        if (customPrompt) obj.promptTemplate = PromptTemplate.fromTemplate(customPrompt)
+        else if (promptKey) obj.promptTemplate = promptKey
 
         const retriever = new HydeRetriever(obj)
         return retriever