add top K to vector stores

packages/components/nodes/vectorstores/Faiss_Existing/Faiss_Existing.ts

@@ -34,6 +34,15 @@ class Faiss_Existing_VectorStores implements INode {
                 description: 'Path to load faiss.index file',
                 placeholder: `C:\\Users\\User\\Desktop`,
                 type: 'string'
+            },
+            {
+                label: 'Top K',
+                name: 'topK',
+                description: 'Number of top results to fetch. Default to 4',
+                placeholder: '4',
+                type: 'number',
+                additionalParams: true,
+                optional: true
             }
         ]
         this.outputs = [
@@ -54,13 +63,16 @@ class Faiss_Existing_VectorStores implements INode {
         const embeddings = nodeData.inputs?.embeddings as Embeddings
         const basePath = nodeData.inputs?.basePath as string
         const output = nodeData.outputs?.output as string
+        const topK = nodeData.inputs?.topK as string
+        const k = topK ? parseInt(topK, 10) : 4
 
         const vectorStore = await FaissStore.load(basePath, embeddings)
 
         if (output === 'retriever') {
-            const retriever = vectorStore.asRetriever()
+            const retriever = vectorStore.asRetriever(k)
             return retriever
         } else if (output === 'vectorStore') {
+            ;(vectorStore as any).k = k
             return vectorStore
         }
         return vectorStore