Update app.py

Try CohereEmbeddings

app.py

@@ -21,6 +21,7 @@ from langchain import hub
 from langchain_core.output_parsers import StrOutputParser
 from langchain_core.runnables import RunnablePassthrough
 from langchain_core.prompts import ChatPromptTemplate
+from langchain_cohere import CohereEmbeddings
 
 from typing import List, Tuple, Dict, Any, Optional
 
@@ -105,7 +106,7 @@ def main() -> None:
 
     ## Mod from nomic-embed-text to nomic-ai/nomic-embed-text-v1.5
     #embeddings = OllamaEmbeddings(model='nomic-ai/nomic-embed-text-v1.5', base_url="http://localhost:11434")
-    embeddings = OllamaEmbeddings(model='nomic-ai/nomic-embed-text-v1.5')
+    embeddings = CohereEmbeddings(model="embed-english-v3.0")
 
     single_vector = embeddings.embed_query("this is some text data")