cohere[patch]: update embeddings and rerank

examples/src/document_compressors/cohere_rerank.ts

@@ -27,7 +27,7 @@ const docs = [
 
 const cohereRerank = new CohereRerank({
   apiKey: process.env.COHERE_API_KEY, // Default
-  model: "rerank-english-v2.0", // Default
+  model: "rerank-english-v2.0",
 });
 
 const rerankedDocuments = await cohereRerank.rerank(docs, query, {

examples/src/document_compressors/cohere_rerank_compressor.ts

@@ -28,7 +28,7 @@ const docs = [
 const cohereRerank = new CohereRerank({
   apiKey: process.env.COHERE_API_KEY, // Default
   topN: 3, // Default
-  model: "rerank-english-v2.0", // Default
+  model: "rerank-english-v2.0",
 });
 
 const rerankedDocuments = await cohereRerank.compressDocuments(docs, query);

examples/src/embeddings/cohere.ts

@@ -1,7 +1,7 @@
 import { CohereEmbeddings } from "@langchain/cohere";
 
 export const run = async () => {
-  const model = new CohereEmbeddings();
+  const model = new CohereEmbeddings({model: "embed-english-v3.0",});
   const res = await model.embedQuery(
     "What would be a good company name a company that makes colorful socks?"
   );

examples/src/guides/expression_language/runnable_maps_sequence.ts

@@ -12,7 +12,7 @@ import { MemoryVectorStore } from "langchain/vectorstores/memory";
 const model = new ChatAnthropic();
 const vectorstore = await MemoryVectorStore.fromDocuments(
   [{ pageContent: "mitochondria is the powerhouse of the cell", metadata: {} }],
-  new CohereEmbeddings()
+  new CohereEmbeddings({model: "embed-english-v3.0",})
 );
 const retriever = vectorstore.asRetriever();
 const template = `Answer the question based only on the following context:

examples/src/indexes/vector_stores/mongodb_atlas_fromTexts.ts

@@ -10,7 +10,7 @@ const collection = client.db(dbName).collection(collectionName);
 const vectorstore = await MongoDBAtlasVectorSearch.fromTexts(
   ["Hello world", "Bye bye", "What's this?"],
   [{ id: 2 }, { id: 1 }, { id: 3 }],
-  new CohereEmbeddings(),
+  new CohereEmbeddings({model: "embed-english-v3.0",}),
   {
     collection,
     indexName: "default", // The name of the Atlas search index. Defaults to "default"

examples/src/indexes/vector_stores/mongodb_atlas_search.ts

@@ -7,7 +7,7 @@ const namespace = "langchain.test";
 const [dbName, collectionName] = namespace.split(".");
 const collection = client.db(dbName).collection(collectionName);
 
-const vectorStore = new MongoDBAtlasVectorSearch(new CohereEmbeddings(), {
+const vectorStore = new MongoDBAtlasVectorSearch(new CohereEmbeddings({model: "embed-english-v3.0",}), {
   collection,
   indexName: "default", // The name of the Atlas search index. Defaults to "default"
   textKey: "text", // The name of the collection field containing the raw content. Defaults to "text"

examples/src/indexes/vector_stores/mongodb_metadata_filtering.ts

@@ -9,7 +9,7 @@ const namespace = "langchain.test";
 const [dbName, collectionName] = namespace.split(".");
 const collection = client.db(dbName).collection(collectionName);
 
-const vectorStore = new MongoDBAtlasVectorSearch(new CohereEmbeddings(), {
+const vectorStore = new MongoDBAtlasVectorSearch(new CohereEmbeddings({model: "embed-english-v3.0",}), {
   collection,
   indexName: "default", // The name of the Atlas search index. Defaults to "default"
   textKey: "text", // The name of the collection field containing the raw content. Defaults to "text"

examples/src/indexes/vector_stores/mongodb_mmr.ts

@@ -7,7 +7,7 @@ const namespace = "langchain.test";
 const [dbName, collectionName] = namespace.split(".");
 const collection = client.db(dbName).collection(collectionName);
 
-const vectorStore = new MongoDBAtlasVectorSearch(new CohereEmbeddings(), {
+const vectorStore = new MongoDBAtlasVectorSearch(new CohereEmbeddings({model: "embed-english-v3.0",}), {
   collection,
   indexName: "default", // The name of the Atlas search index. Defaults to "default"
   textKey: "text", // The name of the collection field containing the raw content. Defaults to "text"

examples/src/indexes/vector_stores/vercel_postgres/example.ts

@@ -16,7 +16,7 @@ const config = {
 };
 
 const vercelPostgresStore = await VercelPostgres.initialize(
-  new CohereEmbeddings(),
+  new CohereEmbeddings({model: "embed-english-v3.0",}),
   config
 );
 

examples/src/models/embeddings/cohere.ts

@@ -4,6 +4,7 @@ import { CohereEmbeddings } from "@langchain/cohere";
 const embeddings = new CohereEmbeddings({
   apiKey: "YOUR-API-KEY", // In Node.js defaults to process.env.COHERE_API_KEY
   batchSize: 48, // Default value if omitted is 48. Max value is 96
+  model: "embed-english-v3.0",
 });
 const res = await embeddings.embedQuery("Hello world");
 console.log(res);

examples/src/retrievers/multi_query.ts

@@ -14,7 +14,7 @@ const vectorstore = await MemoryVectorStore.fromTexts(
     "mitochondria is made of lipids",
   ],
   [{ id: 1 }, { id: 2 }, { id: 3 }, { id: 4 }, { id: 5 }],
-  new CohereEmbeddings()
+  new CohereEmbeddings({model: "embed-english-v3.0",})
 );
 const model = new ChatAnthropic({});
 const retriever = MultiQueryRetriever.fromLLM({

examples/src/retrievers/multi_query_custom.ts

@@ -1,5 +1,5 @@
 import { MemoryVectorStore } from "langchain/vectorstores/memory";
-import { CohereEmbeddings } from "@langchain/community/embeddings/cohere";
+import { CohereEmbeddings } from "@langchain/cohere";
 import { MultiQueryRetriever } from "langchain/retrievers/multi_query";
 import { LLMChain } from "langchain/chains";
 import { pull } from "langchain/hub";
@@ -53,7 +53,7 @@ const vectorstore = await MemoryVectorStore.fromTexts(
     "Mitochondrien bestehen aus Lipiden",
   ],
   [{ id: 1 }, { id: 2 }, { id: 3 }, { id: 4 }, { id: 5 }],
-  new CohereEmbeddings()
+  new CohereEmbeddings({model: "embed-english-v3.0",})
 );
 const model = new ChatAnthropic({});
 const llmChain = new LLMChain({

langchain/src/retrievers/tests/ensemble_retriever.int.test.ts

@@ -15,7 +15,7 @@ test("Should work with a question input", async () => {
       "mitochondria is made of lipids",
     ],
     [{ id: 1 }, { id: 2 }, { id: 3 }, { id: 4 }, { id: 5 }],
-    new CohereEmbeddings()
+    new CohereEmbeddings({model: "embed-english-v3.0",})
   );
   const retriever = new EnsembleRetriever({
     retrievers: [vectorstore.asRetriever()],
@@ -38,7 +38,7 @@ test("Should work with multiple retriever", async () => {
       "mitochondria is made of lipids",
     ],
     [{ id: 1 }, { id: 2 }, { id: 3 }, { id: 4 }, { id: 5 }],
-    new CohereEmbeddings()
+    new CohereEmbeddings({model: "embed-english-v3.0",})
   );
   const vectorstore2 = await MemoryVectorStore.fromTexts(
     [
@@ -51,7 +51,7 @@ test("Should work with multiple retriever", async () => {
       "mitochondria is made of lipids",
     ],
     [{ id: 6 }, { id: 7 }, { id: 8 }, { id: 9 }, { id: 10 }],
-    new CohereEmbeddings()
+    new CohereEmbeddings({model: "embed-english-v3.0",})
   );
   const retriever = new EnsembleRetriever({
     retrievers: [vectorstore.asRetriever(), vectorstore2.asRetriever()],
@@ -76,7 +76,7 @@ test("Should work with weights", async () => {
       "mitochondria is made of lipids",
     ],
     [{ id: 1 }, { id: 2 }, { id: 3 }, { id: 4 }, { id: 5 }],
-    new CohereEmbeddings()
+    new CohereEmbeddings({model: "embed-english-v3.0",})
   );
   const vectorstore2 = await MemoryVectorStore.fromTexts(
     [
@@ -89,7 +89,7 @@ test("Should work with weights", async () => {
       "mitochondria is made of lipids",
     ],
     [{ id: 6 }, { id: 7 }, { id: 8 }, { id: 9 }, { id: 10 }],
-    new CohereEmbeddings()
+    new CohereEmbeddings({model: "embed-english-v3.0",})
   );
   const retriever = new EnsembleRetriever({
     retrievers: [vectorstore.asRetriever(), vectorstore2.asRetriever()],

langchain/src/retrievers/tests/multi_query.int.test.ts

@@ -16,7 +16,7 @@ test("Should work with a question input", async () => {
       "mitochondria is made of lipids",
     ],
     [{ id: 1 }, { id: 2 }, { id: 3 }, { id: 4 }, { id: 5 }],
-    new CohereEmbeddings()
+    new CohereEmbeddings({model: "embed-english-v3.0",})
   );
   const model = new ChatOpenAI({});
   const retriever = MultiQueryRetriever.fromLLM({
@@ -42,7 +42,7 @@ test("Should work with a keyword", async () => {
       "mitochondria is made of lipids",
     ],
     [{ id: 1 }, { id: 2 }, { id: 3 }, { id: 4 }, { id: 5 }],
-    new CohereEmbeddings()
+    new CohereEmbeddings({model: "embed-english-v3.0",})
   );
   const model = new ChatOpenAI({});
   const retriever = MultiQueryRetriever.fromLLM({

libs/langchain-cohere/src/embeddings.ts

@@ -9,14 +9,19 @@ import { chunkArray } from "@langchain/core/utils/chunk_array";
  * parameters specific to the CohereEmbeddings class.
  */
 export interface CohereEmbeddingsParams extends EmbeddingsParams {
-  model: string;
+  model?: string;
 
   /**
    * The maximum number of documents to embed in a single request. This is
    * limited by the Cohere API to a maximum of 96.
    */
   batchSize?: number;
 
+  /**
+   * Specifies the type of embeddings you want to generate.
+   */
+  embeddingTypes?: Array<string>;
+
   /**
    * Specifies the type of input you're giving to the model.
    * Not required for older versions of the embedding models (i.e. anything lower than v3),
@@ -37,11 +42,11 @@ export class CohereEmbeddings
   extends Embeddings
   implements CohereEmbeddingsParams
 {
-  model = "small";
+  model: string | undefined;
 
   batchSize = 48;
 
-  inputType: string | undefined;
+  embeddingTypes = ["float"];
 
   private client: CohereClient;
 
@@ -70,8 +75,16 @@ export class CohereEmbeddings
       token: apiKey,
     });
     this.model = fieldsWithDefaults?.model ?? this.model;
+
+    if (!this.model) {
+      throw new Error(
+        "Model not specified for CohereEmbeddings instance. Please provide a model name from the options here: https://docs.cohere.com/reference/embed"
+      );
+    }
+
     this.batchSize = fieldsWithDefaults?.batchSize ?? this.batchSize;
-    this.inputType = fieldsWithDefaults?.inputType;
+    this.embeddingTypes =
+      fieldsWithDefaults?.embeddingTypes ?? this.embeddingTypes;
   }
 
   /**
@@ -87,7 +100,9 @@ export class CohereEmbeddings
         model: this.model,
         texts: batch,
         // eslint-disable-next-line @typescript-eslint/no-explicit-any
-        inputType: this.inputType as any,
+        inputType: "search_document" as any,
+        // eslint-disable-next-line @typescript-eslint/no-explicit-any
+        embeddingTypes: this.embeddingTypes as any,
       })
     );
 
@@ -120,7 +135,9 @@ export class CohereEmbeddings
       model: this.model,
       texts: [text],
       // eslint-disable-next-line @typescript-eslint/no-explicit-any
-      inputType: this.inputType as any,
+      inputType: "search_query" as any,
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      embeddingTypes: this.embeddingTypes as any,
     });
     if ("float" in embeddings && embeddings.float) {
       return embeddings.float[0];
@@ -137,6 +154,25 @@ export class CohereEmbeddings
     }
   }
 
+  async embed(
+    request: Parameters<typeof this.client.embed>[0]
+  ): Promise<number[]> {
+    const { embeddings } = await this.embeddingWithRetry(request);
+    if ("float" in embeddings && embeddings.float) {
+      return embeddings.float[0];
+    } else if (Array.isArray(embeddings)) {
+      return embeddings[0];
+    } else {
+      throw new Error(
+        `Invalid response from Cohere API. Received: ${JSON.stringify(
+          embeddings,
+          null,
+          2
+        )}`
+      );
+    }
+  }
+
   /**
    * Generates embeddings with retry capabilities.
    * @param request - An object containing the request parameters for generating embeddings.

libs/langchain-cohere/src/rerank.ts

@@ -29,7 +29,7 @@ export interface CohereRerankArgs {
  * Document compressor that uses `Cohere Rerank API`.
  */
 export class CohereRerank extends BaseDocumentCompressor {
-  model = "rerank-english-v2.0";
+  model: string | undefined;
 
   topN = 3;
 
@@ -48,6 +48,11 @@ export class CohereRerank extends BaseDocumentCompressor {
       token,
     });
     this.model = fields?.model ?? this.model;
+    if (!this.model) {
+      throw new Error(
+        "Model not specified for CohereRerank instance. Please provide a model name from the options here: https://docs.cohere.com/reference/rerank"
+      );
+    }
     this.topN = fields?.topN ?? this.topN;
     this.maxChunksPerDoc = fields?.maxChunksPerDoc;
   }

libs/langchain-cohere/src/tests/embeddings.int.test.ts

@@ -2,13 +2,13 @@ import { test, expect } from "@jest/globals";
 import { CohereEmbeddings } from "../embeddings.js";
 
 test("Test CohereEmbeddings.embedQuery", async () => {
-  const embeddings = new CohereEmbeddings();
+  const embeddings = new CohereEmbeddings({model: "small"});
   const res = await embeddings.embedQuery("Hello world");
   expect(typeof res[0]).toBe("number");
 });
 
 test("Test CohereEmbeddings.embedDocuments", async () => {
-  const embeddings = new CohereEmbeddings();
+  const embeddings = new CohereEmbeddings({model: "small"});
   const res = await embeddings.embedDocuments(["Hello world", "Bye bye"]);
   expect(res).toHaveLength(2);
   expect(typeof res[0][0]).toBe("number");
@@ -19,6 +19,7 @@ test("Test CohereEmbeddings concurrency", async () => {
   const embeddings = new CohereEmbeddings({
     batchSize: 1,
     maxConcurrency: 2,
+    model: "small",
   });
   const res = await embeddings.embedDocuments([
     "Hello world",

libs/langchain-cohere/src/tests/rerank.int.test.ts

@@ -20,6 +20,7 @@ const documents = [
 test("CohereRerank can indeed rerank documents with compressDocuments method", async () => {
   const cohereRerank = new CohereRerank({
     apiKey: process.env.COHERE_API_KEY,
+    model: "rerank-english-v2.0"
   });
 
   const rerankedDocuments = await cohereRerank.compressDocuments(
@@ -33,6 +34,7 @@ test("CohereRerank can indeed rerank documents with compressDocuments method", a
 test("CohereRerank can indeed rerank documents with rerank method", async () => {
   const cohereRerank = new CohereRerank({
     apiKey: process.env.COHERE_API_KEY,
+    model: "rerank-english-v2.0",
   });
 
   const rerankedDocuments = await cohereRerank.rerank(